JP4966217B2 - Riding paddy field machine - Google Patents

Description

  The present invention relates to a riding paddy field work machine in which a pair of left and right front wheels are arranged on the front side of the machine body, and a pair of left and right rear wheels are arranged on the rear side of the machine body via a rear wheel support device.

  A riding paddy field machine needs to travel stably in a field with many irregularities while suppressing rocking and vibration of the body. As a rear wheel support device for a riding paddy field machine that satisfies such requirements, a suspension support mechanism for supporting a rear axle case having a pair of left and right rear wheels on the machine body via a suspension and a pair of left and right link members are provided. Then, the rear axle case is connected to a front body fixing part, and is configured in combination with a link support mechanism that restricts the forward / backward movement while allowing the rear axle case to move in the vertical direction ( Patent Document 1).

This riding paddy field machine has a pair of left and right upper links and a pair of left and right lower links extending from the rear axle case to the front side of the machine body. The front portion of the upper link is swingably supported on the main frame of the airframe, the front portion of the lower link is supported on the front portion of the vehicle, and the rear axle case is swingably connected to the airframe. It is. In this way, by supporting the rear axle case on the machine body so as to be able to swing, the rear wheel can be swung in accordance with the unevenness, so that it is possible to travel stably even in a field with severe unevenness. Useful in terms.
JP 2007-89417 A (paragraph numbers [0018] and [0019] and FIGS. 3 and 4)

  In the above-described riding paddy field machine, a pair of left and right upper links and a lower link are connected so that the rear axle case is connected to the front body fixing part and the rear axle case is allowed to move in the vertical direction while restricting the movement in the front and rear direction. In addition, the fuselage fixing portion and the rear axle case are connected by a lateral rod so as to limit the lateral movement of the rear axle case.

  Accordingly, the rear axle case connected to the upper link and the lower link can be moved up and down with a relatively large swing radius, and the lateral movement of the rear axle case with respect to the airframe can be suppressed. However, the rear axle case is connected to the lateral rod, which is another link member, in a state where it is connected to the front side of the fuselage via the upper link and the lower link as described above, and the other end side of the lateral rod. Is connected to the fuselage fixing part. Therefore, between the lateral rod and the link mounting member that pivotally supports the lateral rod on the side of the body fixing portion, not only a complete relative movement in the up-and-down direction but also a relative movement in the front-and-rear direction is carried out, though very little.

  On the side of the link mounting member that supports the lateral rod, the pivot shaft of the lateral rod is supported by the channel-shaped member, but as described above, the external force is applied so that the rear axle case is moved in the front-rear direction. As a result, the link mounting member is deformed, and there is a problem that the backlash at the lateral rod connecting portion gradually increases.

  In order to solve the above-mentioned problems, the present invention increases the strength of the attachment member of the link member connected to the rear axle case capable of simultaneously raising and lowering the left and right rear wheels and raising and lowering the left and right separately, and has excellent durability. The purpose is to provide a riding paddy field machine.

In order to achieve the above object, the riding paddy field machine of the present invention has the following technical means.
[Solution 1]
In the invention according to claim 1, in the riding paddy field machine in which a pair of left and right front wheels are arranged on the front side of the body, and a pair of left and right rear wheels are arranged on the rear side of the body via a rear wheel support device,
The rear wheel support device includes a suspension support mechanism that elastically supports a rear axle case that supports a pair of left and right rear wheels on both the left and right sides with respect to a fuselage fixing portion, and the rear axle case is connected to a front fuselage fixing portion. The rear axle case is configured in combination with a first link member that restricts the longitudinal movement while allowing the vertical movement of the rear axle case,
A second link member is provided that restricts movement of the rear axle case in the left-right direction across the airframe fixing portion and the rear axle case,
A link attachment member for connecting the first link member or the second link member to the fuselage fixing portion is constituted by a rectangular tube-like member having a connection opening at a connection portion of the first and second link members. And
The cross-sectional shape of the first link member or the second link member has a vertical side on which the first link member or the second link member moves in accordance with an allowable vertical movement of the rear axle case. The rectangular shape is longer than the horizontal side that intersects the horizontal direction .
[Action and effect]
As described above, the rear axle case is swingably supported on the fuselage via the suspension support mechanism and the link member, so that even if the running surface has irregularities, the rear axle is adjusted according to the irregularities. The case moves up and down, preventing vibration and tilting of the aircraft. Even if the link mounting member with respect to the airframe fixing portion of the second link member receives an external force in the front-rear direction as the rear axle case swings up and down, the link mounting member itself has a high strength due to the rectangular tubular member. Therefore, the external force can be dispersed over a wide range to avoid a decrease in durability due to the deformation of the link mounting member.

As a result, it is possible to provide a riding paddy field work machine that can travel stably even on an uneven traveling surface and has excellent durability.
Further, the cross-sectional shape of the first link member or the second link member is changed to the vertical side where the first link member or the second link member moves in accordance with the permitted vertical movement of the rear axle case. However, by configuring the rectangular shape longer than the horizontal side that intersects with this, the diameter of the link member is increased compared to the case where the first link member or the second link member is configured by, for example, a round pipe. Without doing so, the bending or tensile strength in the direction in which the first link member or the second link member moves increases, and the durability can be further improved.
[Solution 2]
According to a second aspect of the present invention, in the riding paddy field working machine according to the first aspect, the boss portion of the second link member externally fitted to the shaft portion pivotally supporting the one end side or the other end side of the second link member, An inner / outer double cylinder portion comprising a metal inner cylinder portion and a metal outer cylinder portion, an intermediate elastic layer interposed between the inner cylinder portion and the outer cylinder portion, and an inner cylinder This is characterized in that the axial length of the portion is formed longer than the axial length of the outer cylinder portion .
[Solution 3]
In the invention according to claim 3, in claim 1 or 2 riding paddy working machine described, the shaft portion pivotally supporting the first link member, or the second link member, lubrication passage capable grease from the outside Is characterized by the formation of
[Action and effect]
As described above, by forming an oil injection path capable of injecting grease from the outside in the shaft portion that pivotally supports the first link member or the second link member, the connection portion at each pivot portion is twisted. There is little fear, and in this respect, operability can be improved and durability can be improved.

[Overview of the riding rice transplanter]
FIG. 1 shows a riding rice transplanter as an example of a riding paddy working machine according to the present invention. A lifting cylinder mechanism 3 and a hydraulic cylinder 4 that drives the raising and lowering link mechanism 3 up and down are provided at the rear of the machine body including the left and right front wheels 1 and the left and right rear wheels 2. A planting device 5 is supported.

  As shown in FIG. 1, the seedling planting device 5 includes a transmission case 6, a planting case 7 that is rotatably supported at the rear part of the transmission case 6, and a pair of plantings provided at both ends of the planting case 7. The arm 8, the grounding float 9, the seedling platform 10, and the like are provided. As a result, the planting case 7 is rotationally driven as the seedling platform 10 is driven to reciprocate laterally to the left and right, and the planting arm 8 alternately takes out the seedlings from the lower part of the seedling platform 10 and puts them on the rice field. Plant.

  As shown in FIG. 1, a hopper 12 for storing fertilizer and a feeding portion 13 are fixed to the rear side of the driver seat 11, and a blower 14 is provided below the driver seat 11. A groover 15 is provided in the ground float 9, and a hose 16 is connected across the feeding portion 13 and the groover 15. Thus, along with the seedling planting as described above, the fertilizer is fed from the hopper 12 by a predetermined amount by the feeding unit 13, and the fertilizer is supplied to the grooving device 15 through the hose 16 by the blower 14. Fertilizer is supplied to the rice field through the groove 15.

  A mission case 17 is fixed to the front of the aircraft, and an engine 19 is supported on a support frame 18 connected to the front of the mission case 17. A main transmission 33 consisting of a hydraulic continuously variable transmission (HST) linked to the engine 19 by a belt is connected to the mission case 17 so that the shift output is input to the mission case 17.

  The shifting power input to the mission case 17 is branched into a traveling system and a working system. The branching power of the traveling system is transmitted to the left and right front wheels 1 through a front-wheel differential mechanism (not shown) after being shifted in two steps by a gear-type sub-transmission device (not shown). Further, the transmission power that has passed through the auxiliary transmission is transmitted to the rear axle case 28 at the rear of the machine body. The rear wheel 2 pivotally supported on the left and right ends of the rear axle case 28 is configured to be driven.

  As shown in FIGS. 3 and 4, square pipe-shaped right and left main frames 21 are arranged in the front-rear direction, and a reinforcing member 20 is connected to the lower portions of the front portions of the right and left main frames 21 by welding. ing. The rear part of the mission case 17 enters between the front parts of the right and left main frames 21 and enters between the reinforcing members 20. The right and left lateral sides of the rear part of the mission case 17 are It is connected to the front part of the left main frame 21 and connected to the reinforcing member 20. The rear part of the rear part of the mission case 17 is connected to the reinforcing member 20 by another bolt (not shown).

The front wheel 1 is supported on the front of the machine body via a front wheel support device 1F described later, and the rear wheel 2 is supported on the rear of the machine body via a rear wheel support device 2R described later.
[Front wheel support device]
Next, the front wheel support device 1F that supports the right and left front wheels 1 will be described.

  As shown in FIGS. 1, 4, and 7, right and left front axle cases 23 extend from the right and left lateral sides of the mission case 17, and cylindrical ends are formed at the ends of the right and left front axle cases 23. A support portion 23a is provided obliquely forward and downward (see the vertical axis core P1). A front wheel support portion 24 that supports the right and left front wheels 1 is supported by a support portion 23a of the right and left front axle cases 23 so as to be rotatable around the vertical axis P1 and slidable in the direction of the vertical axis P1. is there. As shown in FIGS. 2, 3, and 5, a pitman arm 25 is supported at the lower part of the mission case 17 so as to be swingable around the vertical axis P <b> 8, and extends backward, and extends between the front wheel support portion 24 and the pitman arm 25. A tie rod 26 is connected. As shown in FIG. 1, a steering handle 27 for swinging the pitman arm 25 is provided. By swinging the pitman arm 25 with the steering handle 27, the right and left front wheels 1 are steered.

As shown in FIG. 7, the front wheel support 24 and the sleeve 74 are rotatably supported on the transmission shaft 70 by bearings 75, and a seal is provided between the support 23 a and the sleeve 74 of the right and left front axle cases 23. A member 76 is provided, and bevel gears 71 and 73 are engaged with each other. A receiving member 77 is applied to the upper bearing 75, and a suspension spring 34 is provided between the receiving members 69, 77 in a double manner inside and outside. That is, the front wheel support device 1 </ b> F is configured by the front axle case 23, the front wheel support portion 24, and the suspension spring 34 interposed between the front axle case 23 and the front wheel support portion 24.
[Rear wheel support device]
Next, the rear wheel support device 2R that supports the right and left rear wheels 2 will be described.

  As shown in FIGS. 3, 4, and 5, the right and left rear wheels 2 are supported on the rear axle case 28. A vertically long right and left bracket 22 having a U-shaped cross section is fixed to the front portion of the rear axle case 28, and right and left upper links 30a are vertically moved around a horizontal axis P2 at the top of the right and left brackets 22. The right and left upper links 30a are swingable up and down around the horizontal axis P3 of the bracket 21a that is supported swingably and extends forward, and fixed to the middle part of the right and left main frames 21. I support it.

  As shown in FIGS. 3, 4, 5, and 9, support pins 31 are fixed laterally outwardly to the lower portions of the right and left brackets 22, and right and left lowers around the horizontal axis P <b> 4 of the support pins 31. The link 30b is supported so as to be swingable up and down and extends forward. A support shaft 93 is installed over the lower portion of the reinforcing member 20, and the right and left lowers are arranged around the horizontal axis P5 at both ends of the support shaft 93. The link 30b is supported so as to be swingable up and down. Upper receiving portions 21 b are fixed to the right and left main frames 21, and lower receiving portions 32 b are supported on the support pins 31. The upper receiving portions 21 b of the right and left main frames 21 and the receiving portions of the support pins 31 are supported. The right and left suspension springs 32a (corresponding to the suspension support mechanism) are provided across the area 32b.

That is, the rear wheel support device 2R includes a suspension spring 32a as a suspension support mechanism that elastically supports the rear axle case 28 supporting the pair of left and right rear wheels 2 on the left and right sides with respect to the main frame 21 that is the fuselage fixing part, A pair of left and right first link members 30 each including a left and right upper link 30a and a left and right lower link 30b are configured to limit the movement in the front-rear direction to a minute range while allowing the rear axle case 28 to move in the vertical direction. Has been.
[Second link member mounting structure]
The rear axle case 28 supported by the rear wheel support device 2R is connected to the main frame 21 by a second link member that restricts relative movement in the left-right direction with respect to the main frame 21.

  That is, as shown in FIGS. 4, 5, and 6, the front and rear shafts 51 provided on the link mounting member 50 extending downward at the rear portion of the left main frame 21 and the right rear portion of the rear axle case 28 are provided. A lateral rod 40 corresponding to the second link member is connected to the rear front / rear shaft 52 provided.

The lateral rod 40 is swingably connected around the front / rear shaft core P6 of the front / rear shaft 51 and the front / rear shaft core P7 of the rear front / rear shaft 52 provided on the right rear portion of the rear axle case 28. Accordingly, the vertical movement of the rear axle case 28 with respect to the main frame 21 is allowed in a wide range, and the relative movement in the horizontal direction is suppressed.
The lateral rod 40 is formed in a rectangular shape in which the length of the side in the up-down direction, which is the moving direction of the rear axle case 28, is longer than the length of the side in the horizontal direction, which is a direction intersecting with the vertical side.

  As a result, as shown in FIGS. 3, 4, 5 and 6, the rear axle case 28 is supported by the right and left suspension springs 32a so as to be movable up and down and rolling freely, and the right and left upper links 30a, right and left The position of the rear axle case 28 in the front-rear direction is determined by the lower link 30b, and the position of the rear axle case 28 in the left-right direction is determined by the lateral rod 40.

  The attachment structure of the second link member for positioning the rear axle case 28 in the left-right direction will be described in more detail.

  As shown in FIGS. 8 and 9, the link mounting member 50 extending downward at the rear portion of the left main frame 21 is in a state where the horizontal cross-section closes the channel-shaped main member 50 a and its open side. And a lid plate material 50b integrated by welding in a rectangular tube shape.

  As shown in FIG. 9A, a front and rear shaft 51 for pivotally supporting a lateral rod 40 as a second link member is attached near the lower end of the main material 50a, and the lateral rod is attached to the front and rear shaft 51. 40, the boss 41 on one end side is externally fitted and connected, and the lower end of the lid plate material 50b is formed shorter than the lower end of the main material 50a, so that the lateral side is formed on the lower end side of the lid plate material 50b. A communication opening 53 for inserting the rod 40 is formed.

As shown in FIG. 9B, the other end side of the lateral rod 40 is provided with a boss portion 42 that is fitted on a rear front / rear shaft 52 that is erected on the rear side of the rear axle case 28. boss 41 of 42 and the one end side, respectively, comprising a metal inner cylinder portion 41a, and 42a, the metal of the outer tubular portion 41b, between the 42b, the intermediate elastic layer 41c made of rubber material, and 42c It has a triple structure. As a result, when a slight twisting force or a strong pushing / pulling operation force is applied to the lateral rod 40, the external force can be reduced.

  In addition, the inner cylinder portions 41a and 42a of the boss portions 41 and 42 are formed to have a slightly longer axial length than the outer cylinder portions 41b and 42b, and the boss portions 41 mounted in the link attachment member 50 are formed. In a state in which the inner cylinder portion 41 a substantially matches the interval width of the wall inner surfaces before and after the link mounting member 50, the outer cylinder portion 41 b is positioned slightly away from the wall inner surfaces before and after the link mounting member 50. Therefore, the clearance generated when the outer cylinder portion 41b is located slightly away from the front and rear wall inner surfaces of the link mounting member 50 causes the lateral rod 40 to swing slightly in the front-rear direction as the rear axle case 28 swings up and down. Even so, the lateral rod 40 is configured to hardly generate an external force that causes the link mounting member 50 to be strongly pressed and deformed.

  At the connecting position of the front and rear shaft 51 provided on the link mounting member 50, the rear front and rear shaft 52 provided at the right rear portion of the rear axle case 28, and the boss portions 41 and 42 provided at both ends of the lateral rod 40, The following lubrication structure is provided. That is, as shown in FIGS. 9A and 9B, the front and rear shafts 51 and the rear front and rear shafts 52 are respectively formed with annular oil sump grooves 51a and 52a in the intermediate portions in the axial direction. In addition, oil supply passages 51b and 52b for injecting grease into the annular oil sump grooves 51a and 52a from the outside through the grease nipple 56 are provided in the shaft from one end side of the front and rear shaft 51 and the rear front and rear shaft 52. Is formed through.

  A reference numeral 54 in FIG. 9A is a stop plate member for preventing the front and rear shaft 51 from coming off, and is fixed to the link mounting member 50 with a stop bolt 55.

Reference numeral 52c in FIG. 9B denotes a set nut, and the boss portion 42 of the lateral rod 40 that is externally fitted to the rear front / rear shaft 52 in a state where the rear front / rear shaft 52 is screwed into the boss hole of the rear axle case 28 is removed. It is to stop.
[Transmission structure to the front wheels]
Next, the transmission structure to the front wheel 1 will be described.

  As shown in FIGS. 1 and 4, a hydrostatic continuously variable transmission 33 is connected to the lateral side of the transmission case 17, and the power of the engine 19 is transmitted to the hydrostatic continuously variable transmission 33 via a transmission belt 35. Is transmitted. The power of the hydrostatic continuously variable transmission 33 is supplied to the right and left front axle cases as shown in FIG. 7 via a gear-type auxiliary transmission (not shown) and a front wheel differential mechanism (not shown). 23 is transmitted to a transmission shaft 63 arranged in the interior of 23. A bevel gear 68 (upper side) and a receiving member 69 (lower side) are supported by a support portion 23a of the right and left front axle cases 23 via a bearing 67, and a bevel gear 66 and a bevel gear 68 fixed to the transmission shaft 63 are supported. And bite. The transmission shaft 70 is attached to the bevel gear 68 and the receiving member 69 so as to be integrally rotatable and slidable by a spline structure, and a bevel gear 71 is fixed to the lower end of the transmission shaft 70.

  As shown in FIG. 7, the front wheel support portion 24 includes an axle 72 that supports the right (left) front wheel 1, and a bevel gear 73 fixed to the axle 72, and a cylindrical sleeve 74 at the upper end of the front wheel support portion 24. Is fixed. The front wheel support 24 and the sleeve 74 are rotatably supported by the transmission shaft 70 by bearings 75, and a seal member 76 is provided between the support 23a and the sleeve 74 of the right and left front axle cases 23, Bevel gears 71 and 73 are engaged.

As a result, as shown in FIGS. 4 and 7, the power of the hydrostatic continuously variable transmission 33 is transmitted to the right and left front wheels 1 via the transmission shafts 63 and 70 and the axle 72. A front wheel support portion 24 is supported on the support portion 23a of the right and left front axle cases 23 so as to be rotatable about the vertical axis P1 and slidable in the direction of the vertical axis P1. The suspension spring 34 acts on the slide in the direction of P1. Thus, when the front wheel support portion 24 slides in the direction of the longitudinal axis P1, the volume of the support portion 23a of the right and left front axle cases 23 changes, but the breather for absorbing this volume change is It is not provided and is absorbed by the seal member of each part.
[Transmission structure to the rear wheel]
Next, the transmission structure of the rear axle case 28 to the right and left rear wheels 2 will be described.

  As shown in FIGS. 2, 3, and 4, a traveling output shaft 78 is provided at the lower part of the rear portion of the transmission case 17 and protrudes rearward so that the power branched from immediately before the front wheel differential mechanism (not shown) Is transmitted to. A universal joint 82 is attached to the end of the travel output shaft 78, and the transmission shaft 84 is connected to the universal joint 82 via a cylindrical joint 83 (allowing the transmission shaft 84 to slide relative to the universal joint 82 while transmitting power). It is. An input shaft 38 projects forward from the front portion of the rear axle case 28, and the transmission shaft 84 and the input shaft 38 are connected via a universal joint 82.

  As shown in FIG. 2, a transmission shaft 39 is provided in the rear axle case 28, and a bevel gear 38 a fixed to the input shaft 38 is engaged with a bevel gear 39 a fixed to the transmission shaft 39. Friction multi-plate type right and left side clutches 41 are provided at the right and left ends of the transmission shaft 39, and the right and left side clutches 41 and the axles 43 that support the right and left rear wheels 2 are provided. In between, a transmission shaft 42 is provided. As shown in FIGS. 2 and 4, the power of the hydrostatic continuously variable transmission 33 is applied to the travel output shaft 78, the transmission shaft 84, the input shaft 38, the transmission shaft 39, the right and left side clutches 41, the transmission. It is transmitted to the right and left rear wheels 2 via the shaft 42.

  As shown in FIG. 2, the right and left side clutches 41 are urged to a transmission state by springs (not shown). A right and left operation arm 51 for operating the right and left side clutches 41 in a disconnected state is provided, and a linkage rod 53 is connected between the pitman arm 25 and the right and left operation arms 51. The state shown in FIG. 2 is a state in which the right and left front wheels 1 (pitman arms 25) are steered to the rectilinear position A0. At this time, the right and left side clutches 41 are operated in a transmission state, and power is transmitted to the right and left front wheels 1 and the right and left rear wheels 2. Even if the right and left front wheels 1 are steered between the rectilinear position A0 and the right and left set angles A1, the above-described state occurs, and the aircraft moves straight or gently to the right or left. Change.

  As shown in FIG. 2, when the right and left front wheels 1 (pitman arm 25) are steered between the right set angle A1 and the right steering limit A2, the right linkage rod by the pitman arm 25 is shown. With the pulling operation of 53, the right side arm 41 is operated to be disconnected by the right operation arm 53, and the right rear wheel 2 is brought into a free rotation state. In this case, the left side clutch 41 is left in a transmission state, and power is transmitted to the left rear wheel 2. When the right and left front wheels 1 (pitman arm 25) are steered between the left set angle A1 and the left steering limit A2, the pulling operation of the left linkage rod 53 by the pitman arm 25 causes the left The left side clutch 41 is operated in the disconnected state by the operating arm 53, and the left rear wheel 2 is in a free rotating state. In this case, the right side clutch 41 is left in a transmission state, and power is transmitted to the right rear wheel 2.

As described above, the right and left front wheels 1 are steered between the right set angle A1 and the right steer limit A2, or between the left set angle A1 and the left steer limit A2. In the state where power is transmitted to the right and left front wheels 1 and the rear wheel 2 outside the turn, the power to the rear wheel 2 on the turn center side is cut off, and the rear wheel 2 on the turn center side is in a freely rotating state. And turn to the right or left. As a result, the rear wheel 2 on the turn center side moves forward while appropriately rotating along with the turn, and the state in which the surface is roughened by the rear wheel 2 on the turn center side during turning is reduced.
[Others]
FIG. 10 shows a lubrication structure of the seedling planting device. In addition to the opening / closing lid 8f, a grease nipple 8a is provided at a position near the extension line of the seedling pushing rod 8c. In this case, compared with the case where grease is supplied from the opening / closing lid 8f, the injected grease reaches the sliding portion of the seed-pushing rod 8c directly, so that the grease is provided at a position away from the extension line. Compared to the above, there is no problem that the effect of sufficient lubrication is not achieved unless the seedling planting device is driven for a while, and there is an advantage that effective lubrication is performed immediately after the injection. In the figure, reference numeral 8b is a seedling planting claw, 8d is a rotating cam, and 8e is an extrusion spring.

  FIGS. 11A and 11B show an attachment portion of the seedling holding stay 100, and a seedling is attached to a support 102 attached to a support rod 101 erected on a partition wall portion on the seedling placement surface side of the seedling placing base 10. The support rod 100a portion of the press stay 100 is inserted and supported, and the β pin 103 restricts movement of the support rod 100a in the axial direction.

Therefore, by ensuring that the position of the seedling holding stay 100 can be maintained in this way, even if the seedling is grown too much or the seedling is extremely thick, the seedling holding stay 100 can reliably By pressing it, the sensing function of the seedling breakage sensor (not shown) can be surely exhibited.
[Another embodiment]
[1] The rectangular tubular shape of the link mounting member 50 may be applied not only to the support portion of the lateral rod 40 but also to a link mounting member that supports the upper link 30a and the lower link 30b.
[2] When the lateral rod 40 , the upper link 30a, or the lower link 30b is replaced with a round pipe and formed into a square shape, it may be constituted by a square pipe or a square axis .
[3] When the lateral rod 40 or each link member is formed into a square shape, the length of the side in the direction in which the movement of each link member is allowed, such as making the side in the vertical direction longer than the piece in the horizontal direction, It may be formed longer than the length in the direction crossing it.
[4] An elastic structure similar to the elastic support structure of the pivot portion on both ends of the lateral rod 40 may be provided on the pivot portion on the first link member 30 side.
[5] A lubrication structure similar to the lubrication structure of the pivot portion on both ends of the lateral rod 40 may be provided on the pivot portion on the first link member 30 side.
[6] In the embodiment described above, a riding rice transplanter has been described as an example of the riding paddy working machine according to the present invention, but other riding paddy working machines such as a riding direct sowing machine may be used.

The side view which shows an example (riding seedling planting machine) of the riding paddy field machine based on this invention Plan view showing the transmission system to the rear wheels Side view showing support structure for rear axle case Plan view showing support structure of rear axle case Front view near the rear axle case Rear view near the rear axle case Longitudinal front view near the front wheel support Rear view showing the link mounting member of the lateral rod It is a partially cutaway sectional view showing a pivotal support portion of the lateral rod, (A) shows the pivotal support portion on the side connected to the link mounting member, and (B) shows the pivotal support portion on the side connected to the rear axle case. Indicate Sectional drawing showing the structure of the lubrication part of the seedling planting device The attachment part of the seedling holding | maintenance stay of a seedling planting apparatus is shown, (A) is a side view, (B) is a rear view.

1 Front Wheel 2 Rear Wheel 21 Main Frame 28 Rear Axle Case 30 First Link Member 30a Upper Link 30b Lower Link 32a Suspension Support Mechanism (Suspension Spring)
40 Lateral rod
41, 42 Boss
41a, 42a inner cylinder part
41b, 42b outer cylinder part
41c, 42c Intermediate elastic layer 50 Link mounting member

Claims (3)

A riding paddy field work machine in which a pair of left and right front wheels are arranged on the front side of the aircraft, and a pair of left and right rear wheels are arranged on the rear side of the aircraft via a rear wheel support device,
The rear wheel support device includes a suspension support mechanism that elastically supports a rear axle case that supports a pair of left and right rear wheels on both the left and right sides with respect to a fuselage fixing portion, and the rear axle case is connected to a front fuselage fixing portion. The rear axle case is configured in combination with a first link member that restricts the longitudinal movement while allowing the vertical movement of the rear axle case,
A second link member is provided that restricts movement of the rear axle case in the left-right direction across the airframe fixing portion and the rear axle case,
A link attachment member for connecting the first link member or the second link member to the fuselage fixing portion is constituted by a rectangular tube-like member having a connection opening at a connection portion of the first and second link members. And
The cross-sectional shape of the first link member or the second link member has a vertical side on which the first link member or the second link member moves in accordance with an allowable vertical movement of the rear axle case. A riding paddy field machine characterized by having a rectangular shape that is longer than a horizontal side crossing the horizontal side . The boss portion of the second link member that is externally fitted to the shaft portion that pivotally supports the one end side or the other end side of the second link member is an inner / outer duplex formed of a metal inner cylinder portion and a metal outer cylinder portion And an intermediate elastic layer interposed between the inner cylindrical portion and the outer cylindrical portion, and the axial length of the inner cylindrical portion is longer than the axial length of the outer cylindrical portion. riding paddy working machine according to claim 1, wherein in Te. The riding paddy field machine according to claim 1 or 2 , wherein an oil injection path capable of injecting grease from outside is formed in a shaft portion that pivotally supports the first link member or the second link member.

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