CN1751555A - Paddy field working machine - Google Patents

Abstract

The present invention provides a paddy field working vehicle, which the left,right front wheel (1) or rear wheel (2) supports the vehicle by the suspending machine (260, 267), the power from the engine transmitted to the gear box (17) of the left, right and front wheel respectively, is fixed on the machine, and the storage material in the hopper feeding the output part (13) to the floor is supported in the machine body, the gearings (97, 105, 107) is set between the gear box (17) and the outpuet part (13).

Description

Paddy field work vehicle

Technical field

The present invention relates to paddy field work vehicles such as riding type rice transplanter or riding-type seed-sowing machine.

Background technology

As this paddy field work vehicle, thus just like for example spy of Japan open 2004-17934 communique, the spy of Japan open in the 2003-81140 communique etc. disclosed like that, left and right sides front-wheel or left and right sides trailing wheel be supported on the Operation Van that body has improved the rideability in the paddy field or on the road via suspension fork mechanism.

As paddy field work vehicle, following Operation Van is arranged, it constitutes from efferent and via supply unit the stock in the hopper (for example powder such as fertilizer or seed body) is supplied with (opening the 2004-17934 communique with reference to the spy of Japan) earthward.In this case, in order to drive efferent, need and to arrive efferent from the transmission of power of engine.

Therefore, main purpose of the present invention is to provide a kind of paddy field work vehicle, thereby it has and can more suitably engine power be delivered to efferent and can improve formation to the power transmission efficiency of efferent.

Summary of the invention

For achieving the above object, to be left and right sides front-wheel or trailing wheel be bearing in paddy field work vehicle on the body via suspension fork mechanism in the present invention, the gearbox that will be delivered to respectively on the trailing wheel of the left and right sides from the power of engine is fixed on the body, and the efferent that the stock in the hopper is supplied with earthward is bearing on the body, it is characterized in that the transmission mechanism that is used to drive aforementioned efferent is arranged on aforementioned gearbox between the efferent.

Constitute according to above-mentioned feature, utilize the suspension fork mechanism that is arranged between left and right sides front-wheel or left and right sides trailing wheel and the body, wheel corresponding with this mechanism and the position of body relation change.At this moment, because gearbox is fixed on the body,, the position of gearbox and body can not change so concerning.In addition, because efferent also is bearing on the body,, the position of efferent and body can not change so concerning yet.Therefore, between the gearbox and efferent that transmission mechanism is erected at and the position of body relation can not change.So even because of the concavo-convex grade on ground makes corresponding wheel and the position between body relation that variation has taken place under the effect of suspension fork mechanism, the relative position relation of transmission mechanism and body can not change yet.Like this, can successfully be delivered to efferent via transmission mechanism and can not be obstructed from gearbox from the power of engine.

Therefore, the certain transmission mechanism of relative position relation of utilization and body can carry out stable transmission of power to efferent from gearbox, thereby can improve the transmission efficiency of biography to the power of efferent.

For obtaining above-mentioned formation, according to a preferred implementation, aforementioned suspension fork mechanism is arranged on aforementioned each trailing wheel, and the back axle case that supports each trailing wheel is bearing on the body via this suspension fork mechanism, and, be delivered to aforementioned back axle case from the power of the output shaft that travels of aforementioned gearbox via universal joint and power transmission shaft.

Under situation about like this back axle case being bearing in via suspension fork mechanism on the body, if the aforementioned output shaft that travels is outstanding from aforementioned gearbox, on its outstanding end, connect aforementioned power transmission shaft via aforementioned universal joint, the transmission of power of the aforementioned thus output shaft that travels is to aforementioned back axle case, export the power that passes to aforementioned transmission mechanism from the aforementioned output shaft that travels, then such formation has following advantage.

Promptly, if the position of back axle case and body relation changes, then with its concomitantly, the position relation of universal joint and power transmission shaft and body also can change, relative with it, output shaft is fixed on the gearbox owing to travel, so the position of travel output shaft and body relation can not change.Therefore, according to above-mentioned formation, can export the power that is used to drive efferent more smoothly from the output shaft that travels that the position relation with body can not change.Therefore, can further improve the transmission efficiency of biography to the power of efferent.

In addition, be from should be from travelling via transmission mechanism to the power of efferent transmission, so efferent is by to drive with the synchronous speed of the travel speed of body with power branch's power of the power that transmits of axle box and each trailing wheel backward.That is, efferent is also to be driven at a high speed if the travel speed of body becomes at a high speed, and efferent also is driven with low speed if the travel speed of body becomes low speed.Thus, with the travel speed of body irrespectively, amount to the powder body of ground supply in the per unit operating range is roughly certain.

In addition,, be provided with the clutch that transmits freely and cut off power, then, can not change so the position of transmission mechanism and body concerns because transmission mechanism is fixed on the body if in aforementioned transmission mechanism, be positioned near the aforementioned output shaft that travels the part.Because clutch also is fixed on the body, so the relation of the position between clutch and the body can not change yet.Thus, the reliability of the transmission of clutch and blocked operation is able to further raising.In addition, owing to clutch is configured on the position of approaching gearbox, so the operating system that is connected with gearbox is configured on the position near each other with the operating system that is connected with clutch.Therefore, be easy to these operating system configuration ground compact, thereby be favourable for the simplicity of structure, the saving space of each operating system.

According to a preferred implementation, aforementioned suspension fork mechanism is arranged on aforementioned each trailing wheel, and be provided with the back axle case that each trailing wheel is supported via this suspension fork mechanism, aforementioned transmission mechanism is to pass between the support unit of body of this back axle case of supporting and this back axle case to dispose.This formation has following advantage.

That is, under the situation on the support unit that the back axle case is bearing in body via suspension fork mechanism, between the support unit of body and back axle case, can produce less space.Can effectively utilize this space and reasonably dispose transmission mechanism, so be favourable from saving the space.In addition because in this constituted, transmission mechanism was positioned at the upside of back axle case, so the situation that transmission mechanism contacts with ground minimizing, thereby help transmission mechanism breakage prevent raising with durability.

According to a preferred implementation, aforementioned suspension fork mechanism is arranged on aforementioned each trailing wheel, and be provided with the back axle case that each trailing wheel is supported via this suspension fork mechanism, aforementioned transmission mechanism arranged at the support unit upper support of the body that this back axle case is supported.This formation has following advantage.

That is, except the back axle case was bearing on the support unit of body via suspension fork mechanism, transmission mechanism also was bearing on the support unit of body.Thus, back axle case but also supporting transmissioning mechanism can be on have not only been supported as the support unit of the body of shared parts.Thus, although the position relation of back axle case and body (the perhaps support unit of body) can change because of suspension fork mechanism, the scope of this variation can be according to being contemplated to comparalive ease with the relation of body (the perhaps support unit of body).Like this, be easy to dispose rightly transmission mechanism, it can not interfered with the back axle case, so, can determine accurately that the position of back axle case and transmission mechanism concerns.In addition, also needn't cross and far dispose transmission mechanism apart from the back axle case.

According to a preferred implementation, aforementioned suspension fork mechanism is arranged on aforementioned each front-wheel and each trailing wheel.According to this formation, each wheel all supports via suspension fork mechanism.Thus, at job state (for the situation of riding type rice transplanter, for example following rice transplanting job state: the driver is seated on the driver's seat, fertilizer is stored in the hopper, rice shoot is positioned on the preparation rice shoot mounting table, and rice shoot is positioned on the rice shoot mounting table of seedling-transplanting device) under, the suspension fork mechanism that is arranged on each wheel utilized, can absorb on one side the vibration that is delivered to wheel from ground etc. well, on one side the base plate of Drive Section is maintained the approximate horizontal state.Therefore, stable taking sense can be obtained, stable paddy-field-working can be carried out.

According to a preferred implementation, be provided with the elongation limit of the aforementioned suspension fork mechanism of decision and the limiting mechanism of shrinkage limit, constitute by this limiting mechanism, the actuating length ratio towards shrinkage limit of suspension fork mechanism is big towards the actuating length of the elongation limit.This formation has following advantage.

That is,, in general, the half-way of its actuating length is set at normal place, decision is set begins limiting mechanism from this position to the action limit of flexible both direction for suspension fork mechanism.At this moment, if as the present invention, the actuating length ratio towards shrinkage limit of setting suspension fork mechanism by this limiting mechanism for is big towards the actuating length of the elongation limit, even then roll under the situation on the bigger protuberance at front-wheel or trailing wheel, suspension fork mechanism also can shrink significantly.Thus, thus helping base plate with Drive Section maintains the approximate horizontal state and obtains stable taking sense.

In addition,, also be provided with and absorb the buffer gear that aforementioned suspension fork mechanism reaches the impact in the elongation limit and the shrinkage limit, then can suppress this impact and be delivered to body, thereby be more favourable if except above-mentioned formation.

According to a preferred implementation, aforementioned suspension fork mechanism is arranged on aforementioned each trailing wheel, and the paddy-field-working device, is provided with when aforementioned paddy-field-working device and rises to above in the specified altitude, forcibly make the pressure elongation mechanism of aforementioned suspension fork mechanism elongation being attached at After-Body from the mode of ground rise or fall via elevating mechanism.This formation has following advantage, below, be explained based on riding type rice transplanter as an example of paddy field work vehicle.

Riding type rice transplanter generally has seedling-transplanting device (example of paddy-field-working device) lifting is supported on the rear portion of body freely and seedling-transplanting device is carried out the elevating mechanism that lifting drives.Riding type rice transplanter generally is to advance under the effect of the driving force of left and right sides trailing wheel, so under the effect of the driving counter-force of left and right sides trailing wheel, there is the tendency that is lifted the front portion of body, but in operation process, the seedling-transplanting device that is bearing in the rear portion of body is a ground connection, so can suppress this tendency.But, when riding type rice transplanter arrives in the furrow limit, seedling-transplanting device is risen significantly from ground and body is turned.Under this situation, because the inhibition effect that is obtained by seedling-transplanting device has not existed, if so in the front portion of the effect lower body of the driving counter-force of the left and right sides trailing wheel tendency that is lifted is arranged, then the ground pressure of left and right sides front-wheel reduces, thereby can not successfully carry out the turning of body sometimes.

For this point, according to above-mentioned formation of the present invention,, seedling-transplanting device surpasses specified altitude if rise being driven by elevating mechanism apart from ground, then under the effect of elongation driving mechanism, the elongation of being forced to property of suspension fork mechanism ground, left and right sides trailing wheel descends, and therein on the way, the ground pressure of left and right sides trailing wheel is temporary transient to become big.Thus, the rear portion of body is lifted, and body is heavy and suppress the reduction of the ground pressure of left and right sides front-wheel before easily.Therefore, the driving force of left and right sides trailing wheel successfully is delivered to ploughs plough, thereby can carry out the turning of body smoothly.Thus, can improve turn performance.

Other feature constitutes, advantage, with reference to accompanying drawing on one side read following explanation and promptly can understand on one side.

In addition, in the following description, will with the body direction of advance of travelling be the fore-and-aft direction, left and right directions of benchmark, laterally, transverse side and above-below direction be called " fore-and-aft direction ", " left and right directions ", " laterally ", " transverse side " and " above-below direction ".

Description of drawings

Fig. 1 is the integral left end view of the paddy field work vehicle of the 1st embodiment of the present invention, is the figure of expression as the riding type rice transplanter of an example of paddy field work vehicle.

Fig. 2 is a vertical view of representing the transmission system of axle box backward and left and right sides trailing wheel transmission.

Fig. 3 be expression back axle case supporting construction, from gearbox backward the axle box transmission transmission system and from the right side view of gearbox to the transmission system of efferent transmission.

Fig. 4 be expression back axle case supporting construction, from gearbox backward the axle box transmission transmission system and from the left side view of gearbox to the transmission system of efferent transmission.

Fig. 5 be expression back axle case supporting construction, from gearbox backward the axle box transmission transmission system and from the vertical view of gearbox to the transmission system of efferent transmission.

Fig. 6 be expression back axle case supporting construction, from gearbox backward the axle box transmission transmission system, from gearbox to the transmission system of efferent transmission and from the front view of gearbox to the transmission system of seedling-transplanting device transmission.

Fig. 7 is the cross-sectional vertical view of gearbox.

Fig. 8 is near the cross-sectional vertical view of speed change gear between strain in the gearbox.

Fig. 9 is near the vertical profile front view of front-wheel support.

Figure 10 is near the vertical profile right side view of output shaft and transmission case of travelling.

Figure 11 is the whole vertical view of riding type rice transplanter shown in Figure 1.

Figure 12 is the vertical view of rice transplanting body.

Figure 13 descends to closing the end view of the rice shoot mounting table under the job state.

Figure 14 rises to open the end view of the rice shoot mounting table under the controlled state.

Figure 15 is the end view of suspention connect mechanism, lifting regulating mechanism, rotation linking part.

Figure 16 is the front view of lifting regulating mechanism.

Figure 17 is the vertical view of the rod guidance of adjusting rod to parts.

Figure 18 is the end view of the backing roll configuration portion of suspention connect mechanism.

Figure 19 (a) descends to closing the end view of the rice shoot mounting table lower end side under the job state,

Figure 19 (b) rises to open the end view of the rice shoot mounting table lower end side under the controlled state.

Figure 20 is the end view of rice shoot guiding parts.

Figure 21 is the vertical view of rice shoot guiding parts.

Figure 22 is that XXII one XXII of Figure 20 is to cutaway view.

Figure 23 is the longitudinal section of direction indicator.

Figure 24 is the vertical view of the bulb configuration portion of direction indicator.

Figure 25 is the bulb of direction indicator and the stereogram of bulb support.

Figure 26 is the stereogram of rice shoot mounting table at bracing piece configuration portion place.

Figure 27 is the cutaway view of rice transplanting body main frame.

Figure 28 be the 1st embodiment supporting construction variation (1), the back axle case, from gearbox backward the axle box transmission transmission system and from the left side view of gearbox to the transmission system of efferent transmission.

Figure 29 is the end view of backing roll configuration portion variation (2), the suspention connect mechanism of the 1st embodiment.

Figure 30 is the end view of backing roll configuration portion variation (3), the suspention connect mechanism of the 1st embodiment.

Figure 31 is the integral left end view of the paddy field work vehicle of the present invention's the 2nd embodiment, is the figure of expression as the riding type rice transplanter of an example of paddy field work vehicle.

Figure 32 is the vertical view of the transmission system of expression back axle case, trailing wheel transmission to the left and right.

Figure 33 is the vertical view of supporting construction of supporting construction, the back axle case of expression left and right sides front-wheel supported box.

Figure 34 is near the vertical profile front view of front-wheel support.

Figure 35 is the end view of the supporting construction of expression back axle case.

Figure 36 is the rearview of the supporting construction of expression back axle case.

Figure 37 is the end view of supporting construction of the back axle case in the variation 1 of expression the 2nd embodiment.

Figure 38 is the end view of supporting construction of the back axle case in the variation 2 of expression the 2nd embodiment.

Figure 39 is the end view of supporting construction of the back axle case in the variation 3 of expression the 2nd embodiment.

Embodiment

Below, on one side with reference to accompanying drawing, based on riding type rice transplanter, each preferred implementation of the present invention is described on one side as an example of paddy field work vehicle (riding-type paddy field work machine of more specifically saying so).

[the 1st embodiment]

[integral body of riding type rice transplanter constitutes]

In riding type rice transplanter shown in Figure 1, have linkage 3 and linkage 3 at the rear portion of the body that has left and right sides front-wheel 1, left and right sides trailing wheel 2 and carry out the hydraulic cylinder (example of elevating mechanism) 4 that lifting drives, seedling-transplanting device (example of paddy-field-working device) 5 is arranged at the rear support of linkage 3.

As shown in Figure 1, seedling-transplanting device 5 has: transmission case 6, rotation drive the rear portion be bearing in transmission case 6 freely rice transplanting case 7, be equipped with in a pair of rice transplanting arm 8, ground connection buoyancy aid 9 and the rice shoot mounting table 10 etc. at the two ends of rice transplanting case 7.Thus, be accompanied by reciprocal traverse feed driving about rice shoot mounting table 10 quilts, rice transplanting case 7 is driven in rotation, and rice transplanting arm 8 alternately takes out rice shoot from the bottom of rice shoot mounting table 10 and plants on the field.

The fertilizer apparatus of this riding type rice transplanter such as Fig. 1 reach as shown in Figure 4 and constitute.That is, in this fertilizer apparatus, will fix and be bearing on the body from the rear side of the driving seat 11 of efferent 13 on the base plate 220 of being located at body of fertilizer (example of the stock) output of the hopper 12 of storing fertilizer.And, above this efferent 13, be provided with hopper 12.Have fan blower 14 at the downside of driving seat 11.On ground connection float 9, have plough 15 (being equivalent to supply unit), between efferent 13 and plough 15, be connected with flexible pipe 16.Thus, be accompanied by foregoing rice shoot plantation, from the fertilizer of hopper 12 by efferent 13 each output ormal weights, under the wind action that fan blower 14 is sent, fertilizer supplies to plough 15 by flexible pipe 16, and fertilizer supplies to ground via plough 15.

Also can carry out live operation, promptly replace fertilizer, via plough 15 seed be supplied to ground (in this case, seedling-transplanting device 5 being stopped) from hopper 12 by in hopper 12, storing seed.

In the lateral outer side of hood about 244, have the left and right sides pedal base plate 236 that links to each other with base plate 220.In the lateral outer side of left and right sides pedal base plate about 236, preparation rice shoot mounting table 237 is prepared on rice shoot mounting table 237 at each about having, and haves three layers at the above-below direction upper support and prepares the rice shoot mounting 237a of portion.

[supporting construction of front-wheel and left rear wheel]

As Fig. 1, Fig. 3 and shown in Figure 5, be fixed with gearbox 17 in the front portion of body, on the bearing support 18 of the front portion that is linked to gearbox 17, be supported with engine 19.The left and right sides organism frame 21 of square tube type (support unit that is equivalent to body) is attached at the top and the extension rearward at the rear portion of gearbox 17, between the rear portion and left and right sides organism frame 21 of gearbox 17, link the strengthening part 20 of shape triangular in shape when having the side to observe.

As Fig. 1 and shown in Figure 5, left and right sides front truck axle box 23 extends from the transverse side of gearbox about 17, has the support 23a cylindraceous of towards oblique front lower place (with reference to longitudinal axis core P1) on the end of left and right sides front truck axle box 23.The front-wheel support 24 of supporting left and right sides front-wheel 1 is to be bearing on the support 23a of left and right sides front truck axle box 23 freely and in the mode of sliding freely on the direction of longitudinal axis core P1 around longitudinal axis core P1 rotation.As Fig. 2, Fig. 3 and shown in Figure 5, steering arm 25 is bearing in the bottom of gearbox 17 freely and extends back around longitudinal axis core P8 swing, is connected with steering tie rod 26 between front-wheel support 24 and steering arm 25.As shown in Figure 1, have the control handwheel 27 that steering arm 25 is carried out swinging operation, utilize 27 pairs of steering arms of control handwheel 25 to carry out swinging operation, thus left and right sides front-wheel 1 is carried out steering operation.

As Fig. 3, Fig. 5 and shown in Figure 6, back axle case 28 forms, and left and right sides trailing wheel 2 at back axle case 28 upper supports.The left and right sides carriage 22 of the lengthwise of cross section コ word shape is fixed on the front portion of back axle case 28, about the transverse axis core P2 of last connecting rod 29 around the top of left and right sides carriage 22 swing up and down supported freely and forwards extend, and swing up and down supported freely around the transverse axis core P3 of the carriage 21a of the pars intermedia that is fixed in left and right sides organism frame 21.

As Fig. 3, Fig. 5 and shown in Figure 6, bottom at left and right sides carriage 22, towards lateral outer side be fixed with fulcrum post 31, about lower link 30 swing up and down supported freely and forwards extend around the transverse axis core P4 of fulcrum post 31, and swing up and down supported freely around the transverse axis core P5 of the bottom at the rear portion of gearbox 17.On left and right sides organism frame 21, be fixed with support portion 21b, on fulcrum post 31, be fixed with support portion 31a, between the support portion 31a of the support portion of left and right sides organism frame 21 21b and fulcrum post 31, left and right sides bearing spring 32 (being equivalent to suspension fork mechanism) is installed.As Fig. 5 and shown in Figure 6, the antero posterior axis core P6 of transverse bar 34 around the rear end of left and right sides organism frame 21 swings up and down supported freely, and swings up and down supported freely around the antero posterior axis core P7 at the rear portion on back axle case 28 right sides.

As mentioned above, constituted the suspension fork mechanism 267 of left and right sides trailing wheel 2 by bearing spring 32 grades.Thus, as Fig. 3, Fig. 5 and shown in Figure 6, back axle case 28 moves up and down freely and rotates supported freely by bearing spring 32, by about go up connecting rod 29, left and right sides lower link 30 and determine position on the fore-and-aft direction of back axle case 28, determine the position on the left and right directions of back axle case 28 by transverse bar 34.

[to the power transmission structure of front-wheel transmission]

As Fig. 5 and shown in Figure 7, on the lateral sides in gearbox 17 left sides, link hydrostatic formula stepless speed change device 33 is arranged, the power of engine 19 is delivered to hydrostatic formula stepless speed change device 33 via driving-belt 35, and the power that is delivered to hydrostatic formula stepless speed change device 33 intactly is delivered to hydraulic pump 37 via power transmission shaft 36.

As shown in Figure 7, the power of the output shaft 33a of hydrostatic formula stepless speed change device 33 is delivered to power transmission shaft 56 via travelling gear 55, is fixed with low-speed gear 57 and high gear 58, travelling gear 59 on power transmission shaft 56.On the power transmission shaft 60 that disposes abreast with power transmission shaft 56, by spline structure with the rotation of power transmission shaft 60 one freely and be embedded with shifted gear 61 outward sliding freely, on power transmission shaft 60, also be fixed with travelling gear 62.Thus, by shifted gear 61 being carried out slide and meshing, carry out speed change and be delivered to power transmission shaft 60 with the power of height two-stage to power transmission shaft 56 with low-speed gear 57 and high gear 58.

As Fig. 7 and shown in Figure 9, between gearbox 17 and left and right sides front truck axle box 23, ground connection is disposed a pair of power transmission shaft 63, between a pair of power transmission shaft 63, have differential gear 64, be fixed on travelling gear 65 and travelling gear 62 engagements on the casing 64a of differential gear 64, on the end of a pair of power transmission shaft 63, be fixed with bevel gear 66.Cylinder part 81 is embedded in outward on the power transmission shaft 63 by the key structure, with the rotation of this power transmission shaft one freely and slide freely, by cylinder part 81 and the end of the casing 64a of differential gear 64 are meshed, differential gear 64 is in the lock state.

As shown in Figure 9, on the support 23a of left and right sides front truck axle box 23, be supported with bevel gear 68 (upside) and support component 69 (downside) via bearing 67, bevel gear 66,68 meshes together.The one rotation is installed with bevel gear 68 and support component 69 freely and sliding freely by spline structure for power transmission shaft 70, in the lower end of power transmission shaft 70, is fixed with bevel gear 71.

As shown in Figure 9, on front-wheel support 24, have front axle 72 that right (left side) front-wheel 1 is supported, be fixed in the bevel gear 73 on the front axle 72, be fixed with sleeve 74 cylindraceous in the upper end of front-wheel support 24.Front-wheel support 24 and sleeve 74 rotate by bearing 75 and are bearing in freely on the power transmission shaft 70, between the support 23a and sleeve 74 of left and right sides front truck axle box 23, have seal member 76, and bevel gear 71,73 meshes together.Support component 77 is connected on the bearing 75 of upside, has the two-layer bearing spring 40 in the inboard and the outside between support component 69,77.

Thus, as Fig. 7 and shown in Figure 9, the power of the output shaft 33a of hydrostatic formula stepless speed change device 33 is delivered to left and right sides front-wheel 1 via power transmission shaft 56,60, differential gear 64, power transmission shaft 63,70 and front axle 72.Freely and on the support 23a that is bearing in left and right sides front truck axle box 23 on the direction of longitudinal axis core P1 sliding freely, bearing spring 40 plays a role to the slip of longitudinal axis core P1 direction with respect to front-wheel support 24 front-wheel support 24 around longitudinal axis core P1 rotation.

As mentioned above, by support 23a, front-wheel support 24 and the helical spring 40 etc. of left and right sides front truck axle box 23, constituted the suspension fork mechanism (example of front wheel suspension mechanism) 260 of left and right sides front-wheel 1.

[to the drive structure of trailing wheel transmission]

As Fig. 2, Fig. 3 and shown in Figure 7, the output shaft 78 of travelling be equipped with in the bottom at the rear portion of gearbox 17 (when overlooking be body about central CL slightly on the right side) and outstanding backward, be fixed on bevel gear 79 and bevel gear 80 engagements that are fixed on the output shaft 78 that travels on the casing 64a of differential gear 64, universal joint 82 is installed in end at the output shaft 78 that travels, and power transmission shaft 84 is connected with universal joint 82 via expansion joint 83 cylindraceous (transferring power and permission power transmission shaft 84 are with respect to the slip of universal joint 82).In the front portion of back axle case 28 (about body central CL slightly on the right side), output shaft 38 is outstanding forward, and power transmission shaft 84 and power shaft 38 link together via universal joint 82.

As shown in Figure 2, in back axle case 28, have power transmission shaft 39, be fixed in the bevel gear 38a and the bevel gear 39a engagement of being fixed in power transmission shaft 39 of power shaft 38.On the left and right end portions of power transmission shaft 39, have the left and right sides sidepiece clutch 41 of the many templates of friction, between the back axle 43 of sidepiece clutch 41 and supporting left and right sides trailing wheel 2, have power transmission shaft 42.Thus as Fig. 2, Fig. 3, shown in Figure 7, the power of the output shaft 33a of hydrostatic formula stepless speed change device 33 is via the casing 64a of power transmission shaft 56,60, differential gear 64, the output shaft 78 that travels, power shaft 38, power transmission shaft 39, left and right sides sidepiece clutch 41, power transmission shaft 42 and be delivered to left and right sides trailing wheel 2.

As shown in Figure 7, in the wall portion of the inside of gearbox 17 and travel and have multi-disc friction plate 44 between the output shaft 78, rotation is outer freely relatively is embedded on the output shaft 78 that travels for discoid functional unit 45.The mode that operating axis 46 intersects with the downside with the output shaft 78 that travels and rotary manipulation is supported freely, the pars intermedia 46a of operating axis 46 forms cross section first quarter moon shape, the pars intermedia 46a of operating axis 46 and the back end in contact of functional unit 45.As mentioned above, constituted brake 47 by friction plate 44, functional unit 45 and operating axis 46 etc., brake pedal (not shown) mechanically links together with operating axis 46 and hydrostatic formula stepless speed change device 33.

Thus, when brake pedal being trampled operation, hydrostatic formula stepless speed change device 33 is operated into neutral stop position, operating axis 46 is rotated operation and paper clockwise direction in Fig. 7 rotates predetermined angular, functional unit 45 is operated the paper top pushing of the pars intermedia 46a of axle 46 to Fig. 7, and then functional unit 45 pushing friction plates 44, thereby brake 47 is operated into brake side.As Fig. 2, Fig. 7, shown in Figure 9, when brake 47 is operated into brake side, left and right sides front-wheel 1 is via differential gear 64 and power transmission shaft 63,70 and be applied in braking, and left and right sides trailing wheel 2 is via the output shaft 78 that travels, power transmission shaft 84, power shaft 38, power transmission shaft 39, left and right sides sidepiece clutch 41, power transmission shaft 42 and be applied in braking.

As shown in Figure 2, left and right sides sidepiece clutch 41, is had the left and right sides motion arm 51 of left and right sides sidepiece clutch 41 to the partition state of operation to the drive state application of force by spring (not shown), is connecting connecting rod 53 between steering arm 25 and left and right sides motion arm 51.State shown in Figure 2 is that left and right sides front-wheel 1 is diverted straight ahead position A0, the state when left and right sides sidepiece clutch 41 is manipulated into drive state operated, and transmission of power is to left and right sides front-wheel 1 and left and right sides trailing wheel 2.Even straight ahead position A0 and about set angle A1 between left and right sides front-wheel 1 is carried out steering operation, also can become aforesaid state, the body straight ahead or gently to the right or turn left to.

As shown in Figure 2, between the operating limit A2 on the set angle A1 on right side and right side, left and right sides front-wheel 1 is carried out in the steering operation, the connecting rod 53 on draw operations right side by steering arm 25, sidepiece clutch 41 by the motion arm 51 on right side with the right side is operated to the partition state, thereby off hind wheel 2 becomes free rotation state.Under this situation, the sidepiece brake 41 in left side keeps drive state, and power still is passed to left rear wheel 2.Between the operating limit A2 in the set angle A1 in left side and left side, left and right sides front-wheel 1 is carried out in the steering operation, the connecting rod 53 in draw operations left side by steering arm 25, sidepiece clutch 41 by the motion arm 51 in left side with the left side is operated to the partition state, thereby left rear wheel 2 becomes free rotation state.Under this situation, the sidepiece brake 41 on right side keeps drive state, and power still is passed to off hind wheel 2.

Like this, left and right sides front-wheel 1 is being carried out in the steering operation between the steering lock A2 on the set angle A1 on right side and right side or between the steering lock A2 in the set angle A1 in left side and left side, become following state: transmission of power is to the trailing wheel 2 in the left and right sides front-wheel 1 and the outside of turning, biography then is cut off to the power of the trailing wheel 2 of turning center side, thereby the trailing wheel 2 of pivot side becomes free rotation state, turns right like this or turns left.Thus, turn and the state of rotation straight ahead moderately, thereby reduced when turning the problem of the ground failure that the trailing wheel 2 by the turning center side causes while the trailing wheel 2 of turning center side becomes to be accompanied by.

[to the power transmission structure of seedling-transplanting device transmission]

As shown in Figures 7 and 8, travelling gear 48 and 6 travelling gears 49 interlink and rotate together and integratedly, and travelling gear 48 is embedded on the power transmission shaft 60 with the 49 relative rotations of 6 travelling gears are outer freely, and travelling gear 48,59 meshes together.With power transmission shaft 50 that power transmission shaft 60 disposes abreast on be embedded with 6 change-speed gearings 52 outside the relative rotation freely, 6 pairs of gears 49,52 mesh respectively, have to select a change-speed gearing 52 and can freely it be attached on the power transmission shaft 50 or from power transmission shaft 50 to remove the action bars 54 that links.As mentioned above, constituted speed change gear 85 between strain by 6 pairs of gears 49,52 and action bars 54 etc., select change-speed gearing 52 in 6 change-speed gearings 52 and it is attached on the power transmission shaft 50 by action bars 54, the power to power transmission shaft 60 carries out 6 grades of speed changes and is delivered to power transmission shaft 50 thus.

As Fig. 5 and shown in Figure 8, output shaft 86 is equipped with in the bottom at the rear portion of gearbox 17 (when overlooking be body about the position of central CL) and outstanding backward, relatively the outer freely bevel gear 87 and bevel gear 88 engagements that are fixed on the power transmission shaft 50 that is embedded on the output shaft 86 of rotation.Shifting part 89 is embedded in outward on the output shaft 86 by spline structure, with the rotation of this output shaft 86 one freely and slide freely, have to shifting part 89 to the spring 90 of the side application of force of bevel gear 87 engagement, and have shifting part 89 operated and make its action bars 91 away from bevel gear 87, constituted freely the rice transplanting clutch 92 that the power with power transmission shaft 50 transmits and cuts off to output shaft 86 thus.

As Fig. 1, Fig. 5 and shown in Figure 6, power transmission shaft 93 is connected with output shaft 86 and rearward extends, be configured in when overlooking body about on the position of central CL, power transmission shaft 93 rotations are bearing on the support 94 that is fixed on the left and right sides organism frame 21 freely, and power transmission shaft 93 is configured in the upside (side is configured between left and right sides organism frame 21 and the back axle case 28 when observing) of back axle case 28.Connecting power transmission shaft 95 via universal joint 82 on power transmission shaft 93, power transmission shaft 95 is connected with seedling-transplanting device 5.Thus, as Fig. 5, Fig. 7, shown in Figure 8, the power of power transmission shaft 60 is via speed change gear between strain 85, bevel gear 87,88, rice transplanting clutch 92, output shaft 86, power transmission shaft 93,95 and be delivered to seedling-transplanting device 5.

[to the transmission of power structure of efferent transmission]

As Fig. 3, Fig. 5 and shown in Figure 10, on the part of giving prominence on the output shaft 78 that travels from gearbox 17, on the part between universal joint 82 and the gearbox 17, be fixed with travelling gear 96 on the output shaft 78 that travels, transmission case 97 (being equivalent to transmission mechanism) is embedded on travel output shaft 78 and the travelling gear 96 outside the rotation freely via bearing 98 relatively in the mode that covers travelling gear 96, transmission case 97 is connected on the gearbox 17, and the feasible output shaft 78 that travels can not involve rotation with travelling gear 96.

As Fig. 3, Fig. 5 and shown in Figure 10, output shaft 99 is equipped with on transmission case 97 and is outstanding backward, and output shaft 99 is positioned at the bottom (when overlooking be body about the position slightly on the right side of central CL) at the rear portion of gearbox 17.Inside at transmission case 97, on output shaft 99, be embedded with travelling gear 100 outside the rotation freely relatively, travelling gear 96,100 meshes together, the one rotation freely and outer sliding freely being embedded on the output shaft 99 has the spring 102 of the side application of force that shifting part 101 is meshed to itself and travelling gear 100 by spline structure for shifting part 101.Thus, in the inside of transmission case 97, constituted the clutch 103 that transmits and cut off the power of the output shaft 78 that travels freely to output shaft 99.

As shown in Figure 3, clutch 103 is equipped with in the right side of transmission case 97 to the motion arm 104 that cuts off state of operation (operation that shifting part 101 is left from travelling gear 100), be formed with peristome 20a on strengthening part 20, motion arm 104 is in the face of the peristome 20a of strengthening part 20.As Fig. 3 and shown in Figure 8, that rice transplanting clutch 92 is similarly outstanding to the right from gearbox 17 to action bars 91 that cuts off state of operation (operation that shifting part 89 is left from bevel gear 87) and motion arm 104.

According to above formation, the output shaft 78 that travels is fixed on the gearbox 17 and is outstanding from here, is connected with power transmission shaft 99 via universal joint 82 on its outstanding end, and thus, the transmission of power of the output shaft 78 that travels is to back axle case 28.In addition, via the travelling gear 100 on the output shaft 99 in travelling gear 96 on this output shaft 78 that travels and the transmission case 97, output is used to drive the power of efferent 13.And, on the part, have the clutch 103 that transmits freely and cut off power near the output shaft 78 that travels in this transmission mechanism.Motion arm 104 links with the blocked operation of rice transplanting clutch 92, thereby is carried out blocked operation by spring 102 to this clutch 103 of the transmission side application of force.

Extremely shown in Figure 5 as Fig. 3, power transmission shaft 105 (being equivalent to transmission mechanism) is connected in output shaft 99 and rearward extends, be configured in when overlooking than on the central CL position slightly on the right side about body, rotation is supported with power transmission shaft 105 freely on the support 106 that is fixed in left and right sides organism frame 21, power transmission shaft 105 is configured in the upside (when the side was observed, power transmission shaft 105 is configuration between left and right sides organism frame 21 and back axle case 28 with passing) of back axle case 28.On power transmission shaft 105, be fixed with motion arm 105a, above the input part 13a of efferent 13 and the motion arm 105a of power transmission shaft 105 between, be connected with connecting rod 107 (being equivalent to transmission mechanism).Thus, the power of output shaft 78 of travelling is delivered to power transmission shaft 105 via transmission case 97 (travelling gear 96,100, clutch 103 and output shaft 99), and the rotary power of power transmission shaft 105 is as the power of push-and-pull and be delivered to the input part 13a of efferent 13 via connecting rod 107.

[formation of seedling-transplanting device]

Below, on one side with reference to Figure 11 to Figure 13, the formation to aforementioned seedling-transplanting device 5 is elaborated on one side.

The rice transplanting body 111 of seedling-transplanting device 5 is made of the main frame 114 that constitutes with horizontal square tube material, the feed box 115, the aforementioned transmission case 6 that rearward extends from horizontal a plurality of positions of main frame 114 of lateral center portion that be bearing in main frame 114.Both lateral sides in the rearward end of each transmission case 6 is provided with rice transplanting mechanism 113.In the front upper place of each rice transplanting mechanism 113, be provided with and be set side by side with the rice shoot mounting table 10 of supplying with a plurality of rice shoot mounting 10a of portion of rice shoot respectively to a plurality of rice transplanting mechanisms 113 in the horizontal.This rice shoot mounting table 10 is arranged to more the assembling posture that more rearward tilts a little to its lower end side.Be provided with the guide rail 118 of rice shoot mounting table 10 usefulness in the lower end side of rice shoot mounting table 10.At the downside of rice transplanting body 111, can link around the lateral shaft core of end thereafter has aforementioned ground connection float 9 with swinging up and down.

Shown in Figure 12 waited, each rice transplanting mechanism 113 had: rotate the aforementioned rice transplanting case 7 that is bearing in freely on the transmission case 6 via horizontal driving shaft 113a, around the axle core parallel with driving shaft 113a and rice transplanting arm 8, the unitary rotation of pivot suspension at the both ends of this rice transplanting case 7 is bearing in rice transplanting pawl 113d on each rice transplanting arm 8 freely, sliding drives the rice shoot that is bearing in freely on each rice transplanting arm 8 and release parts 113e etc.

The driving force that is input to feed box 115 from aforementioned power transmission shaft 95 is delivered to driving shaft 113a by driving mechanism inside, that utilized gear or chain and the transmission mechanism (not shown) that is positioned at feed box 115 and transmission case 6, and rice transplanting case 7 is rotated.When rice transplanting case 7 rotated, each rice transplanting arm 8 was around the axle core corotation of driving shaft 113a, and by being positioned at the gear type driving mechanism (not shown) of rice transplanting case 7 inside, each rice transplanting arm 8 rotates with respect to 7 rotations of rice transplanting case.Thus, in each rice transplanting mechanism 113, a pair of rice transplanting pawl 113d moves back and forth with different phase places.Promptly, the front end edge rotary motion trace T shown in Figure 13 of each rice transplanting pawl 113d and on above-below direction, moving back and forth, carry out following rice transplanting campaign: be positioned at when the front end of a rice transplanting pawl 113d in the upper end of rotary motion trace T, the front end of another rice transplanting pawl 113d is positioned at the lower end of rotary motion trace T.

[installation constitution of rice shoot mounting table]

As shown in figure 13, the installation portion of rice shoot mounting table 10 is formed by horizontal upper rail 131, and described upper rail 131 is fixed in the back side from the position of centre of gravity G of this rice shoot mounting table 10 to upside that leave the position of length D from.As shown in figure 12, rice shoot mounting table framework 119 has: be fixed on pair of right and left pillar 119a, pillar connecting rod 119b etc. on the main frame 114 of rice transplanting body 111.And the aforementioned installation portion of rice shoot mounting table 10 is bearing in the upper end of two pillar 119a of rice shoot mounting table framework 119 via connect mechanism.This connect mechanism has: suspention connect mechanism 130A, lifting regulating mechanism 130B, rotation linking part 130C.

Aforementioned suspention connect mechanism 130A such as Figure 15 to Figure 16 and shown in Figure 180 have: aforementioned upper rail 131, be embedded into backing roll 133 in the gathering sill 132 of this upper rail 131 on horizontal a plurality of positions, supporting arm 135, pivot suspension that each backing roll 133 supports linked the trace 135a of each roller fulcrum 134, the fulcrum 136 parallel with aforementioned roller fulcrum 134, via this fulcrum 136 the base end side pivot suspension of supporting arm 135 are attached at cramp bar 137 on the pars intermedia via roller fulcrum 134 in its front.The 137a of binding foot at the two ends of this cramp bar 137 is attached on the supporting end 119c of aforementioned pillar 119a.

Aforementioned upper rail 131 is embedded on each backing roll 133 outside the engaging also as shown in figure 18.That is, by the rotation of each backing roll 133, upper rail 131 is by 133 guidings of each backing roll, with respect to roller fulcrum 134 in the horizontal to the left and right any direction relatively move.

As shown in figure 18, on the supporting side face of backing roll 133, be provided with parallel snap-latch surface 133a, front side inclination snap-latch surface 133b and rear side inclination snap-latch surface 133.Parallel snap-latch surface 133a and this rotating shaft core 134a are formed at the pars intermedia on the rotating shaft core 134a direction of above-mentioned abutment roller abreast.Front side inclination snap-latch surface 133b is to be formed obliquely in the front side of parallel snap-latch surface 133a with respect to this rotating shaft core 134a near the mode of rotating shaft core 134a more to the front side more.In addition, rear side inclination snap-latch surface 133c is to be formed obliquely in the rear side of parallel snap-latch surface 133a with respect to this rotating shaft core 134a near the mode of rotating shaft core 134a more to rear side more.On spigot surface on the upper rail 131 and following spigot surface, be provided with parallel snap-latch surface 133a, front side inclination snap-latch surface 133b and corresponding parallel snap-latch surface 132a, front side inclination snap-latch surface 132b and the rear side inclination snap-latch surface 132c of rear side inclination snap-latch surface 133c with backing roll 133.Like this, no matter backing roll 133 and upper rail 131 are on respect to rotating shaft core 134a parallel snap-latch surface 133a, 132a, still all engage on the snap-latch surface 133b, the 132b that tilt with respect to rotating shaft core 134a, 133c, 132c.

Thus, in suspention connect mechanism 130A, each backing roll 133 is via supporting arm 135 and cramp bar 137 and by 119 supportings of rice shoot mounting table framework.In addition, each backing roll 133 is bearing on the upper rail 131, and thus, rice shoot mounting table 10 is supporting by obtaining suspention on the position of upside than its position of centre of gravity G, and can move back and forth in the horizontal with respect to rice shoot mounting table framework 119.Because suspention connect mechanism 130A is the top configuration, so to compare with the formation that links at downside and thereby a greater part of load of supporting acts on lower end side, this moves back and forth and can carry out more smoothly.In addition, though muddy water utilizes the configuration of such top easily attached to the downside of rice shoot mounting table 10 when operation, can suppress the generation of the friction that causes by muddy water.

As Figure 12, Figure 16～shown in Figure 180, lifting regulating mechanism 130B comprises: the front and back that aforementioned upper rail 131, aforementioned supporting arm 135, gangbar 135a, unitary rotation are attached at (being a lateral center) supporting arm 135 freely here towards fulcrum 136 on adjusting rod 138, be bearing in the rod guidance of the adjusting rod 138 on the aforementioned cramp bar 137 to parts 139.When around fulcrum 136 and when gathering sill 139a carried out swinging operation in the horizontal to adjusting rod 138, fulcrum 136 was carried out rotating operation, thereby supporting arm 135 is carried out swinging operation.So, utilize the interlock effect of gangbar 135a, other supporting arm 135 also is carried out swinging operation, thereby all supporting arms 135 all upper rail 131 is operated via backing roll 133, make it with respect to cramp bar 137 lifting abreast.The adjusting rod of operating on the assigned position 138 is swung the application of force by the locking spring 138a (with reference to Figure 15) with these adjusting rod 138 bindings, when rod guidance in parts 139 snap onto among the location indentations 139b (with reference to Figure 17), adjusting rod 138 remains on its operating position to parts 139 by rod guidance.Thus, each supporting arm 135 overcomes the weight of rice shoot mounting table 10 and is maintained on the swing position corresponding with the operating position of adjusting rod 138.

Like this, utilize rod guidance adjusting rod 138 to be remained on the operating position to parts 139, thus each supporting arm 135 around front and back towards fulcrum 136 and swing up and down, act on the upper rail 131 via backing roll 133.Thus, descending operation power or confining force act on than the position of centre of gravity G of rice shoot mounting table 10 more by on the position of upside, and thus, rice shoot mounting table 10 is with respect to 119 liftings of rice shoot mounting table framework and remain on the lifting position.

Such rotation linking part 130C shown in Figure 12 and Figure 15 etc., by with aforementioned cramp bar 137 respectively link the 137a of foot link up, make its via about connecting pin 137b rotate with respect to the supporting end 119c of aforementioned pillar 119a and constitute freely.In addition, aforementioned upper rail 131 is arranged on the upside of the position of centre of gravity G of rice shoot mounting table 10 as installation portion.This upper rail 131 is can and linking with respect to rice shoot mounting table framework 119 with the mode that suspention connect mechanism 130A and lifting regulating mechanism 130B rotate around the lateral shaft core P rotation of passing each connecting pin 137b.

Be provided with loading and unloading locking mechanism 142 freely about rice shoot mounting table framework 119, described locking mechanism 142 is made of bolt hole 140 that is installed in the supporting end 119c that is located at pillar 119a and the lock(ing) bolt be located between the bolt hole 141 of the 137a of binding foot of cramp bar 137.Utilize the effect of this locking mechanism 142, rice shoot mounting table 10 can not be locked on the rice shoot mounting table framework 119 rotationally.

As Figure 13 and shown in Figure 19, the back side in the bottom of rice shoot mounting table 10 is provided with and sets up the 10b of the portion that is directed to that is directed to parts.On aforementioned guide rail 118, be formed with and be used to make this to be directed to the gathering sill 118a that the 10b of portion enters.Thus, guide rail 118 via be arranged in the transverse ends portion about supporting device 150 and be bearing on the transmission case 6 of rice transplanting body 111.

This supporting device 150 has: be fixed on support unit 151 on the transmission case 6, upper end and be fixed on mounting rod 153 on the guide rail 118 by binder bolt 152.

The bottom of this mounting rod 153 is inserted in the pilot hole of a pair of up and down guide part 154 of support unit 151, only obtains card sliding freely with respect to support unit 151.Thus, guide rail 118 and rice transplanting body 111 are fastened togather in the mode that can not relatively move in the horizontal.Thus, even rice shoot mounting table 10 is transferred in the horizontal, guide rail 118 can not move with it yet but be bearing on the rice transplanting body 111.Be directed on the 10b of portion aforementioned, be provided with resin piston shoes 10c.Bring into play guide function on two guiding face 118b of these resin piston shoes 10c in gathering sill 118a, thus, rice shoot mounting table 10 moves guiding in its bottom in the horizontal by guide rail 118.

By about supporting device 150 in the engaging of support unit 151 and mounting rod 153, guide rail 118 is fastened togather in the mode that relatively moves along the vertical direction freely with rice transplanting body 111.In addition, because the 10b of the portion that is directed to of rice shoot mounting table 10 enters into the gathering sill 118a of guide rail 118, so guide rail 118 and rice shoot mounting table 10 are fastened togather in the mode that one along the vertical direction moves freely.Thus, when rice shoot mounting table 10 by lifting regulating mechanism 130B when upper and lower moves up, guide rail 118 moves up at upper and lower with respect to rice transplanting body 111 with rice shoot mounting table 10.

Shown in Figure 19 (a), Figure 19 (b), the gathering sill 118a of guide rail 118 is towards top and rear opening.When rice shoot mounting table 10 swung up and down around the lateral shaft core P of such rotation linking part 130C and with respect to rice transplanting body 111, the bottom of rice shoot mounting table 10 was opened the decline shown in controlled state and Figure 19 (a) in the rising shown in Figure 19 (b) and is closed between the job state and switch.Under controlled state was opened in rising, the 10b of the portion that is directed to of rice shoot mounting table 10 threw off upward from gathering sill 118a, broke away from from guide rail 118 thus.Under this state, as shown in figure 14, rise on the bottom of rice shoot mounting table 10 and from the rotary motion trace T of rice transplanting mechanism 113 away from.On the other hand, under job state is closed in decline,, the 10b of the portion that is directed to of rice shoot mounting table 10 engages with guide rail 118 thereby entering into gathering sill 118a from the top.Under this state, as shown in figure 13, the rotary motion trace T of the bottom of rice shoot mounting table 10 and rice transplanting mechanism 113 interferes when observing in the side.

As Figure 14 and shown in Figure 19, the rear side of the bottom of rice shoot mounting table 10, on the rice shoot mounting table both ends transversely, be provided with the securing rod 160 that the rice shoot mounting table uses and the support unit 161 of rod.

Each securing rod 160 is bearing on the framework part of rice shoot mounting table 10 freely around the axle core rotating operation of binder bolt 162, when being carried out rotating operation, between lock-out state and latch-release state, switch, described lock-out state is meant that the front of securing rod 160 enters into the downside of the end 118c of guide rail 118, thereby the lower end side of rice shoot mounting table 10 is fixed on to descend closes the state (with reference to Figure 19 (a)) of job state, thereby front that described latch-release state is meant securing rod 160 is thrown off from the downside of the end 118c of guide rail 118 and removed this decline and close the state of fixing (with reference to Figure 19 (b)) job state under.

Each support unit 161 rotates on the framework part that is attached at rice shoot mounting table 10 freely around the lateral shaft core of this linking part on a distolateral linking part that is positioned at this support unit 161, can swing descending operation with respect to rice shoot mounting table 10.By the swing descending operation, each support unit 161 is also blocked user mode (with reference to Figure 14) only and is ended switching between the receiving state on the retainer of rice shoot mounting table 10 (with reference to Figure 13) in the rear side of rice shoot mounting table 10 with vertical posture card at the gathering sill 118a that hangs down from rice shoot mounting table 10, its free end enters into guide rail 118.The support unit 161 that switches to user mode is the counter-force parts with guide rail 118, plays the cantilever support effect with respect to rice shoot mounting table 10, overcomes gravity and the bottom of rice shoot mounting table 10 is remained on aforementioned rising opens controlled state.The support unit 161 that switches to receiving state has been removed the cantilever support with respect to rice shoot mounting table 10, closes job state thereby rice shoot mounting table bottom can drop to descend.

As Figure 19～shown in Figure 21, downside at aforementioned guide rail 118, be formed with the L-shaped parts of cross section that constitute rice shoot retainer 165, on this rice shoot retainer 165, be formed with otch, formed the rice shoot conveying end 166 corresponding respectively with each rice transplanting mechanism 113 by this otch.

Retainer 165 is with respect to the effect of bunch shape rice shoot performance retainer on each the rice shoot mounting 10a of portion that is positioned in rice shoot mounting table 10.Specifically, retainer 165 makes the lower end of this bunch shape rice shoot stretch out the state of specific length and it is fixed maintenance to the such rotation track T of rice transplanting mechanism 113 in the lower end from the rice shoot mounting 10a of portion.Each rice shoot conveying end 166 is configured to, and the front of rice transplanting pawl 113d of rice transplanting mechanism 113 of doing the rice transplanting campaign is taken out the rice shoot group from the bottom of bunch shape rice shoot by rice shoot conveying end 166.On aforementioned retainer 165, be provided with rice shoot guiding parts 167 from each rice shoot conveying end 166 extension downwards.

As Figure 12～shown in Figure 13, between aforementioned feed box 115 and rice shoot mounting table 10, be provided with transverse feed mechanism 170, described transverse feed mechanism 170 has from feed box 115 to the extended traverse feed axle 171 of a horizontal side with from extended traverse feed arm 172 of the rear side of rice shoot mounting table 10 etc.

Being installed in traverse feed body 173 on the traverse feed axle 171 moves freely with traverse feed arm 172 one and links together.Traverse feed axle 171 rotates with the driving of rice transplanting mechanism 113 linkedly by the driving mechanism (not shown) in the feed box 115.Traverse feed body 173 engages with helicla flute (not shown) on the outer peripheral face that is arranged on traverse feed axle 171, moves back and forth certain stroke by traverse feed axle 171 along this helicla flute, thereby traverse feed arm 172 is carried out move operation.Transverse feed mechanism 170 moves back and forth the rice transplanting campaign of each rice transplanting mechanism 113 in linkage in the horizontal.

The binding pin-and-hole 174 (with reference to Fig. 5) that is arranged on the traverse feed arm 172 for binding aforementioned lateral feeding body 173 forms slotted hole, to realize being used to allow rice shoot mounting table 10 to be circulated by the interlock of descending operation by lifting regulating mechanism 130B.

As Figure 12～shown in Figure 14, on the back side of each rice shoot mounting 10a of portion of rice shoot mounting table 10, be provided with length feed band 180.Be provided with longitudinal feed mechanism 185 between rice shoot mounting table 10 and feed box 115, described longitudinal feed mechanism 185 has: be installed in length feed arm 183 on the length feed axle 182 with driving wheel body 181 interlock of each length feed band 180, drive the pair of right and left actuating arm 184 of the lateral outer side that is arranged on feed box 115 freely.

When rice shoot mounting table 10 is arrived by lateral transfer in some stroke ends, the left and right sides, length feed arm 183 and actuating arm 184 butts, the stroke of being set by swinging operation by this actuating arm 184 corresponding to the trip terminal point.Thus, length feed axle 182 is driven the angle of rotation of setting, thereby drives each length feed band 180 with the stroke of setting.In the traverse feed stroke end about each rice shoot mounting table 10 arrives, all by longitudinal feed mechanism 185 with bunch shape rice shoot on the rice shoot mounting 10a of portion on each length feed band 180 to rice transplanting mechanism 113 length feed preseting lengths.Length feed arm 183 links with length feed axle 182 to rotary clutch (not shown) via folk prescription, when position of readiness restores swing, does not carry out transmission with respect to length feed axle 182 after being driven by actuating arm 184.

That is, by each rice transplanting mechanism 113, a pair of rice transplanting pawl 113d alternately passes rice shoot conveying end 166 and the inside by rice shoot guiding parts 167 from the top of the lower end side of rice shoot mounting table 10, thereby drops on the face of field.Utilize each rice transplanting pawl 113d, at rice shoot conveying end 166 places, the bottom of bunch shape rice shoot on the rice shoot mounting 10a of portion from mounting in rice shoot mounting table 10 cuts off the rice shoot group of enough strains and with its taking-up.This rice shoot is being protected by rice shoot guiding parts 167 and is being lowered by conveying, thereby can not come off from rice transplanting pawl 113d, in the time of on dropping to field earth, releases parts 113e by rice shoot and shifts onto in the earth from rice transplanting pawl 113d, carries out rice transplanting like this.This rice transplanting moves through a pair of rice transplanting pawl 113d and alternately carries out in same rice transplanting bar.

With the rice transplanting campaign in linkage, by transverse feed mechanism 170, the upper end of rice shoot mounting table 10 is by backing roll 133 guidings of suspention connect mechanism 130A, is slided by guide rail 118 and guide in its bottom, and rice shoot mounting table 10 is moved back and forth in the horizontal under such state.At this moment, the bottom of bunch shape rice shoot on the rice shoot mounting 10a of portion is along the rice shoot retainer 165 of guide rail 118 and relatively move in the horizontal with respect to rice shoot conveying end 166, thus, the rice transplanting pawl 113d of each rice transplanting mechanism 113 from horizontal one distolateral beginning of bunch bottom of shape rice shoot to another distolateral rice shoot group of taking out successively.Like this, in horizontal the moving of rice shoot mounting table 10 quilts, rice shoot mounting table 10 is suspended in midair to support on one side by suspention connect mechanism 130A on one side and is laterally moved, and becomes less so be applied to the load of the rice shoot mounting table on the guide rail 118.

Each rice shoot mounting table 10 arrives in some traverse feeds stroke end, the left and right sides, and length feed axle 182 is all driven by longitudinal feed mechanism 185.Thus, the length feed band 180 of each rice shoot mounting 10a of portion rotated predetermined stroke, and bunch shape rice shoot of each rice shoot mounting 10a of portion is by rice shoot retainer 165 length feeds of length feed band 180 to guide rail 118.This length feed amount be equivalent to by rice transplanting mechanism 113 gained vertically on the suitable length of rice shoot taking-up amount.

Under the situation that the rice shoot taking-up amount on vertical by the rice shoot mounting table of rice transplanting mechanism 113 gained is regulated, to adjusting rod 138 operate make its along rod guidance to the gathering sill 139a of parts 139 swing, be arranged in the locational adjusting rod 138 of Action Target and snap onto rod guidance and it is kept thereby make to the location indentations 139b of parts 139.So the upper rail 131 of 135 pairs of rice shoot mounting tables 10 of each supporting arm of lifting regulating mechanism 130B produces lift action, carries out lift adjustment with respect to 119 pairs of rice shoot mounting tables of rice shoot mounting table framework 10.At this moment, the mounting rod 153 of the supporting device 150 about guide rail 118 moves with guide rail 118 and with respect to support unit 151 liftings, guide rail 118 with rice shoot mounting table 10 with respect to 111 liftings of rice transplanting body.So the rice shoot retainer 165 of guide rail 118 is with respect to the rotary motion trace T lifting of rice transplanting mechanism 113, rice shoot, rice transplanting pawl 13d pass in the rice shoot conveying end 166, rice transplanting pawl 13d changes with respect to the degree of depth that enters of rice shoot conveying end 166.Thus, the rice shoot group that will take out of rice transplanting mechanism 13 in the size change of mounting table on vertically.That is the rice shoot taking-up amount of each rice transplanting mechanism 113 increase and decrease.

Replacing at the 10b of the portion that is directed to that carries out rice shoot mounting table 10 or its resin piston shoes 10c, under the situation with respect to the maintenance activity of the rear side of guide rail 118 or rice shoot mounting table 10, securing rod about the bottom 160 is switched to the latch-release state, releasing by rotate linking part 130C about the twist-lock realized of locking mechanism 142, and then the traverse feed arm 172 of releasing transverse feed mechanism 170 and the binding of traverse feed body 173, to the bottom of rice shoot mounting table 10 swinging operation that rises, open controlled state around the lateral shaft core P that rotates linking part 130C thereby become to rise.So the 10b of the portion that is directed to of rice shoot mounting table 10 rises and leaves and expose from guide rail 118, and the rear side of rice shoot mounting table 10 and the rice transplanter body portion that is covered with by rice shoot mounting table 10 usually are by opening.At this moment, by using support unit 161, needn't support operation, lower end side promptly is maintained to rise opens controlled state, thereby operation becomes and is easy to carry out.Therefore, under the situation of replacing that seedling-transplanting device 5 is wished or maintenance, thereby with need all unload the integral body of rice shoot mounting table 10 down waste time and energy formation and compare, can carry out these operations like a cork.In addition, open controlled state side by side with rising, being directed to the 10b of portion and its resin piston shoes 10c becomes from guide rail 118 opened state, so the replacing of these parts also can be carried out rapidly.

As Figure 20～shown in Figure 22, rice shoot guiding parts 167 is made of pair of right and left side guide plate 168 and a central guide post 169, the upper end of described a pair of sidepiece guide plate 168 is fixed on the rice shoot retainer 165 of guide rail 118 by the fixed installation portion 168a of screw thread, and the upper end of described central guide post 169 is attached on the upper end of this pair of right and left side guide plate 168.

Pair of right and left side guide plate 168 is made by the integrally formed of resin material with central guide post 169, thus the part that the integral body of rice shoot guiding parts 167 becomes one.

Central authorities' guide post 169 constitutes the arch that has the transverse width narrower slightly than rice transplanting pawl 113d interval each other, and be configured to the closer to central guide post 169 lower end side, enter into rice transplanting pawl 113d the degree of depth of inboard of rotary motion trace T dark more, thus, central authorities' guide post 169 enter into rice transplanting arm 8 pair of right and left rice transplanting pawl 113d pawl each other, can be to the maintenance seedling of rice transplanting arm 8 performance supporting role.In the upper end of sidepiece guide plate 168, be provided with the position than central guide post 169 more by the rice shoot guiding parts outside and with about sidepiece guide plate 168 connecting rod 168b connected to each other.

As Fig. 1 and shown in Figure 11, be provided with direction indicator 190 in the both lateral sides of rice shoot mounting table 10.As Figure 23～shown in Figure 25, about direction indicator 190 by bulb housing recess 191, be configured in lighting a lamp 192, will be installed in bulb housing recess 191 on the sidewall 10e and cover the lens 193 that get up and constitute in this bulb housing recess 191, described bulb housing recess 191 is set in place on the sidewall 10e of the most horizontal end of rice shoot mounting table 10.

On two positions of the outer peripheral face of the installation axial region of bulb 192, be provided with locator protrusions 192a.Light a lamp when 192 in assembling, each locator protrusions 192a enters into the upside of bulb support 194 from the otch 195 of the support 194 of lighting a lamp of the housing recess 191 of lighting a lamp, while make seal member 196 that the conoid protuberance 197 that strain is crossed bulb support 194 take place.Thereby a locator protrusions 192a is used for confirming that with retention tab 198 butts bulb 192 has arrived the projection of the installation site of regulation after crossing conoid protuberance 197, on the other hand, entering into locator protrusions 192a between conoid protuberance 197 and the retention tab 198 is used for conoid protuberance 197 or retention tab 198 butts and prevents the projection that comes off of bulb 192.

As shown in figure 26, on the back side of rice shoot mounting table 10, be provided with bracing piece 200 along the transverse width direction of rice shoot mounting table 10.Bracing piece 200 has the cable accommodating groove 201 and the link piece portion 202 that is positioned at the both lateral sides of this cable accommodating groove 201 as routing path that forms along this bracing piece 200, under the assembling posture that the opening of cable accommodating groove 201 is closed by rice shoot mounting table 10, link with rice shoot mounting table 10 by a pair of link piece portion 202.In addition, the electric cable 203 that is used for direction indicator 190 grades connects up in the mode that the back side in rice shoot mounting table 10 is accommodated in cable accommodating groove 201.

As shown in figure 27, on the main frame 114 of rice transplanting body 111, be provided with cable holder groove 206 and clamper 209, described cable holder groove 206 is formed at the lower face side of this main frame 114 in the mode towards rice transplanting body lower opening, and described clamper 209 loading and unloading are fixed on the locational fastener 208 of the both lateral sides that is positioned at cable holder groove 206 freely with securing electric lines 207 therein.Clamper 209 is configured on a plurality of positions transversely of main frame 114.

[variation of the 1st embodiment]

(1) in the above-described embodiment, efferent 13 is fixed and is bearing on the body at attend a banquet 11 rear side of driving, is provided with hopper 12 above it.Also can replace this mode, and fixing in the following manner as shown in figure 28: be fixed on scaffold 108 on the back axle case 28 and make it extend to the top, fix on scaffold 108 upper support efferents 13 ground.And hopper 12 is set above efferent 13.Here, constitute and be delivered to output shaft 109 after the power that has output shaft 109, a power shaft 38 at the rear portion of back axle case 28 is branched.And, between the input part 13a of the motion arm 109a of this output shaft 109 and efferent 13, be connected with connecting rod 110.

Thus, the power of the output shaft 78 that travels is via power transmission shaft 84 and power shaft 38 and be delivered to output shaft 109, and the rotary power of output shaft 109 is as the power of push-and-pull and be delivered to the input part 13a of efferent 13 via connecting rod 110.

(2) aforementioned suspention connect mechanism 130A can constitute as shown in figure 29 like that.This suspention connect mechanism 130A has backing roll 133 and upper rail 131, described backing roll 133 have tilt with respect to the rotating shaft core 134a of backing roll 133, as the supporting side face of the circular arc of snap-latch surface 133d, that described upper rail 131 has is that rotating shaft core 134a with respect to backing roll 133 tilts, as the last spigot surface and the following spigot surface of the circular arc of snap-latch surface 132d.

(3) aforementioned suspention connect mechanism 130A can also constitute as shown in figure 30 like that.Figure 30 represents to have the suspention connect mechanism 130A of another other embodiments.This suspention connect mechanism 130A has the backing roll 133 that is made of the parts of bearings that has utilized ball bearing.

(4) in addition, although omitted diagram, but as lifting regulating mechanism 130B, also can replace formation as above-mentioned embodiment, promptly around the antero posterior axis core and in the horizontal thereby swinging mounting arm 135 carries out descending operation to rice shoot mounting table 10, but constitute, thereby around the lateral shaft core and the swing supporting arm carries out descending operation to rice shoot mounting table 10.

[the 2nd embodiment]

Below, with reference to Figure 31～Figure 36, the 2nd embodiment of paddy field work vehicle of the present invention is described.In the present embodiment, also being based on riding type rice transplanter describes.The integral body of the riding type rice transplanter in the present embodiment constitutes

In riding type rice transplanter shown in Figure 31, rear portion at the body that has left and right sides front-wheel 1, left and right sides trailing wheel 2, have linkage 3 and linkage 4 and carry out the hydraulic cylinder 4 that lifting drives, seedling-transplanting device (example of paddy-field-working device) 5 at the rear support of linkage 3.

As shown in figure 31, seedling-transplanting device 5 has: transmission case 6, rotation drive the rear portion be bearing in transmission case 6 freely rice transplanting case 7, be equipped with in a pair of rice transplanting arm 8, ground connection float 9 and the rice shoot mounting table 10 etc. at the two ends of rice transplanting case 7.Thus, be accompanied by reciprocal traverse feed driving about rice shoot mounting table 10 quilts, rice transplanting case 7 is driven in rotation, and rice transplanting arm 8 alternately takes out rice shoot from the bottom of rice shoot mounting table 10 and plants on the ground.

As Figure 31 and shown in Figure 33, dispose gearbox 17 in the front portion of body.On the supporting arm 18 of the front portion that is linked to this gearbox 17, supporting engine 19.Organism frame 21 about square tube type is attached at the top and the extension rearward at the rear portion of gearbox 17.Gearbox 17, about the top of organism frame 21, have base plate 220.Top at the rear portion of base plate 220 has to drive and attends a banquet 11.In the front portion of base plate 220, have the hood 244 of engine 19 and covering engine 19.On the top of hood 244, have control handwheel 27.

As shown in figure 31, the lateral outer side about hood 244, have link to each other with base plate 220 about pedal base plate 236.About pedal base plate 236 about lateral outer side, the preparation rice shoot mounting table 237 about having is on each preparation rice shoot mounting table 237, at the above-below direction upper support preparation rice shoot mounting 237a of portion that haves three layers.

The fertilizer apparatus of this riding type rice transplanter constitutes as shown in figure 31 like that.That is, in this fertilizer apparatus, will fix and be bearing on the body from the rear side of the driving seat 11 of efferent 13 on the base plate 220 of being located at body of fertilizer (example of the stock) output of the hopper 12 of storing fertilizer.And, above this efferent 13, be provided with hopper 12.Have fan blower 14 at the downside of driving seat 11.On ground connection float 9, have plough 15 (being equivalent to supply unit), between efferent 13 and plough 15, be connected with flexible pipe 16.Thus, be accompanied by foregoing rice shoot plantation, from the fertilizer of hopper 12 by efferent 13 each output ormal weights, under the wind action that fan blower 14 is sent, fertilizer supplies to plough 15 by flexible pipe 16, and fertilizer supplies to ground via plough 15.

Also can carry out live operation, promptly replace fertilizer, via plough 15 seed be supplied to bottom surface (in this case, seedling-transplanting device 5 being stopped) from hopper 12 by in hopper 12, storing seed.

[supporting construction of front-wheel and drive structure]

As Figure 33 and shown in Figure 34, about front truck axle box 23 extend from the transverse side of gearbox about 17, on the end of left and right sides front truck axle box 23, have the support 23a cylindraceous of towards oblique front lower place (with reference to longitudinal axis core P1).The front-wheel support 24 of supporting left and right sides front-wheel 1 is to be bearing on the support 23a of left and right sides front truck axle box 23 freely and in the mode of sliding freely on the direction of longitudinal axis core P1 around longitudinal axis core P1 rotation.As Figure 32 and shown in Figure 33, steering arm 25 is bearing in the bottom of gearbox 17 freely and extends back around longitudinal axis core P8 swing, is connected with steering tie rod 26 between front-wheel support 24 and steering arm 25.Thus, utilize 27 pairs of steering arms of control handwheel 25 to carry out swinging operation, thus left and right sides front-wheel 1 is carried out steering operation.

As Figure 33 and shown in Figure 34, linking on the lateral sides in gearbox 17 left sides has hydrostatic formula stepless speed change device 33, and the power of engine 19 is delivered to hydrostatic formula stepless speed change device 33 via driving-belt 35.The power of hydrostatic formula stepless speed change device 33 is delivered to the power transmission shaft 63 that is built in left and right sides front truck axle box 23 via the secondary speed-changing device that is built in gearbox 17 (not shown) (height two-stage ground speed change freely) and differential gear (not shown).

As shown in figure 34, on the support 23a of left and right sides front truck axle box 23, be supported with bevel gear 68 (upside) and support component 69 (downside), be fixed in bevel gear 66 on the power transmission shaft 63, mesh together with bevel gear 68 via bearing 67.The one rotation is installed with bevel gear 68 and support component 69 freely and sliding freely by spline structure for power transmission shaft 70, in the lower end of power transmission shaft 70, is fixed with bevel gear 71.

As shown in figure 34, on front-wheel support 24, have front axle 72 that each front-wheel 1 is supported, be fixed in the bevel gear 73 on the front axle 72, be fixed with sleeve 74 cylindraceous in the upper end of front-wheel support 24.Front-wheel support 24 and sleeve 74 rotate by bearing 75 and are bearing in freely on the power transmission shaft 70, between the support 23a and sleeve 74 of left and right sides front truck axle box 23, have seal member 76, and bevel gear 71,73 meshes together.Support component 77 is connected on the bearing 75 of upside, has inboard and the two-layer bearing spring 40 that is made of helical spring in the outside between support component 69 and support component 77.

Thus, as Figure 33 and shown in Figure 34, the power of hydrostatic formula stepless speed change device 33 is delivered to left and right sides front-wheel 1 from power transmission shaft 63 beginning via power transmission shaft 70 and front axle 72.Freely and on the support 23a that is bearing in left and right sides front truck axle box 23 on the direction of longitudinal axis core P1 sliding freely, bearing spring 40 plays a role to the slip of longitudinal axis core P1 direction with respect to front-wheel support 24 front-wheel support 24 around longitudinal axis core P1 rotation.

As mentioned above, by support 23a, front-wheel support 24 and the bearing spring 40 etc. of left and right sides front truck axle box 23, constituted the suspension fork mechanism 260 of left and right sides front-wheel 1.

[supporting construction of trailing wheel and drive structure]

As Figure 33, Figure 35 and shown in Figure 36, by have the central portion 28a that grows crosswise, from central portion 28a to the oblique back lower place extend about horizontal sidepiece 28b be formed with back axle case 28, the horizontal sidepiece 28b upper support about back axle case 28 left and right sides trailing wheel 2.The left and right sides carriage 22 of the lengthwise of cross section コ word shape is fixed on the front portion of the central portion 28a of back axle case 28, about go up the transverse axis core P2 of connecting rod 29 and swing up and down supported freely and forwards extend around the top of left and right sides carriage 22, and swing up and down supported freely around the transverse axis core P3 of the pars intermedia of left and right sides organism frame 21.

As Figure 33, Figure 35 and shown in Figure 36, the inside portion of horizontal sidepiece 28b about back axle case 28, be fixed with fulcrum post 31 with the back axle 43 of supporting left and right sides trailing wheel 2 towards the inboard with core shape ground, between the horizontal sidepiece 28b about the end of fulcrum post 31 and back axle case 28, be fixed with carriage 262.About lower link 30 swing up and down supported freely and forwards extend around the transverse axis core P4 of fulcrum post 31, and swing up and down supported freely around the transverse axis core P5 of the bottom at the rear portion of gearbox 17.

As Figure 35 and shown in Figure 36, constitute suspension framework 261 by the コ word shape that elongated sheet material is bent into lengthwise, the carriage 261a of bottom that is fixed on suspension framework 261 is supported freely around the transverse axis core P4 of fulcrum post 31 swing, and the rear side of the inboard of the horizontal sidepiece 28b of the lateral outer side of suspension framework 261 about the lower link 3a of the left and right sides of linkage 3, back axle case about 28, the central portion 28a of back axle case 28 extends upward.About the rear portion of organism frame 21 be fixed with fulcrum post 221a, in the slotted hole 261b on the top that is formed at suspension framework 261, the fulcrum post 221a of the organism frame 21 about being inserted with is on the fulcrum post 221a of the organism frame 21 about two locking pins 263 are installed in.

As Figure 35 and shown in Figure 36, top at suspension framework 261, the outer sliding freely support component 264 that is embedded with, with in the carriage 261a of suspension framework 261 and the mode between the support component 264, the bearing spring 32 that is made of helical spring is embedded on the suspension framework 261 outward.Rubber components 265 is installed in the mode of the bottom of the slotted hole 261b that is positioned at suspension framework 261, on the top of suspension framework 261 rubber components 266 is installed, on the fulcrum post 221a of the organism frame 21 about support component 264 is pressed to by the active force of bearing spring 32.As Figure 33,35 and shown in Figure 36, the antero posterior axis core P6 of carriage 221c of transverse bar 34 on the organism frame 21 that is fixed in the left side swings up and down supported freely, and swings up and down supported freely around the antero posterior axis core P7 of the central portion 28a of back axle case 28.

As mentioned above, constituted the suspension fork mechanism (example of rear wheel suspension mechanism) 267 of left and right sides trailing wheel 2 by suspension framework 261 and bearing spring 32 etc.Thus, as Figure 31, Figure 35 and shown in Figure 36, back axle case 28 by about bearing spring 32 move up and down freely and rotate supported freely, by about go up connecting rod 29, left and right sides lower link 30 and determine position on the fore-and-aft direction of back axle case 28, determine the position on the left and right directions of back axle case 28 by transverse bar 34.

[bearing state of front-wheel and trailing wheel]

Figure 33, Figure 35 and STA representation rice transplanting job state (for example about 40% of the full load condition of rice shoot mounting table 10, preparation rice shoot mounting table 237 and hopper 12 state) shown in Figure 36.Under the rice transplanting job state, as Figure 35 and shown in Figure 36, about the fulcrum post 221a of scaffold 21 be positioned at central authorities' (middle position of the actuating length of bearing spring 32) of the slotted hole 261b of suspension framework 261, as shown in figure 34, about the support 23a of front truck axle box 23 on, front-wheel support 24 is positioned at the central authorities of actuating length.Thus, under the rice transplanting job state, become state shown in Figure 31, promptly base plate 220 with about pedal base plate 236 approximate horizontal.

About aforementioned rice transplanting job state, in other words be

LA＝FA/RA≈FB/RB＝LB

Wherein,

LA: the displacement of bearing spring 40

LB: the displacement of bearing spring 32

FA: act on the load on the right side (left side) front-wheel 1

FB: act on the load on the right side (left side) trailing wheel 2

RA: the spring constant of two-layer bearing spring 40

RB: the spring constant of bearing spring 32

Thus, under the road surface pavement state of contact of left and right sides front-wheel 1, left and right sides trailing wheel 2 and level, base plate 220 with about pedal base plate 236 be the state of approximate horizontal.

Then, under the full load condition of rice shoot mounting table 10, preparation rice shoot mounting table 237 and hopper 12, the fulcrum post 221a of Figure 35 and left and right sides scaffold 21 shown in Figure 36 is positioned at the lower end of the slotted hole 261b of suspension framework 261, left and right sides trailing wheel 2 (back axle case 28) becomes and can descend with respect to body, but can not rise to state more than the body with respect to body.Similarly, front-wheel support 24 shown in Figure 34 (sleeve 74) and bearing 67 or support component 69 butts, left and right sides front-wheel 1 become and can descend with respect to body (the support 23a of left and right sides front truck axle box 23) but can not rise to the above state of body with respect to body (the support 23a of left and right sides front truck axle box 23).

Under the Light Condition of rice shoot mounting table 10, preparation rice shoot mounting table 237 and hopper 12, the fulcrum post 221a of Figure 35 and left and right sides scaffold 21 shown in Figure 36 is positioned at the upper end of the slotted hole 261b of suspension framework 261, left and right sides trailing wheel 2 (back axle case 28) becomes and can rise with respect to body, but can not drop to state below the body with respect to body.Similarly, the locating snap ring 70a of the upper end of power transmission shaft 70 shown in Figure 34 and bevel gear 68 butts, left and right sides front-wheel 1 become and can rise with respect to body (the support 23a of left and right sides front truck axle box 23) but can not drop to the following state of body with respect to body (the support 23a of left and right sides front truck axle box 23).

[to the power transmission structure of trailing wheel transmission]

As Figure 32 and shown in Figure 33, the output shaft 78 that travels is equipped with in the rear portion of gearbox 17 and gives prominence to backward, power shaft 38 is projected into the front portion of the central portion 28a of back axle case 28 forward, and the output shaft 78 that travels links together via universal joint 82, expansion joint cylindraceous 83 and power transmission shaft 84 with power shaft 38.

Shown in figure 32, in back axle case 28, have power transmission shaft 39, be fixed in the bevel gear 38a and the bevel gear 39a engagement of being fixed in power transmission shaft 39 of power shaft 38.On the left and right end portions of power transmission shaft 39, have the left and right sides sidepiece clutch 41 of the many templates of friction, about sidepiece clutch 41 and the back axle 43 of left and right sides trailing wheel 2 between, have power transmission shaft 42.Thus as Figure 32, shown in Figure 33, the power of hydrostatic formula stepless speed change device 33 is via the output shaft 78 that travels, power transmission shaft 84, power shaft 38, power transmission shaft 39, left and right sides sidepiece clutch 41, power transmission shaft 42 and be delivered to left and right sides trailing wheel 2.

Shown in figure 32, left and right sides sidepiece clutch 41, is had the left and right sides motion arm 51 of left and right sides sidepiece clutch 41 to the partition state of operation to the drive state application of force by spring (not shown), is connecting connecting rod 53 between steering arm 25 and left and right sides motion arm 51.State shown in Figure 32 is that left and right sides front-wheel 1 is diverted straight ahead position A0, the state when left and right sides sidepiece clutch 41 is manipulated into drive state operated, and transmission of power is to left and right sides front-wheel 1 and left and right sides trailing wheel 2.Even straight ahead position A0 and about set angle A1 between left and right sides front-wheel 1 is carried out steering operation, also can keep aforesaid state, the body straight ahead or gently to the right or turn left to.

Shown in figure 32, between the operating limit A2 on the set angle A1 on right side and right side, left and right sides front-wheel 1 is carried out in the steering operation, the connecting rod 53 on draw operations right side by steering arm 25, sidepiece clutch 41 by the motion arm 51 on right side with the right side is operated to the partition state, thereby off hind wheel 2 becomes free rotation state.Under this situation, the sidepiece brake 41 in left side keeps drive state, and power still is passed to left rear wheel 2.Between the operating limit A2 in the set angle A1 in left side and left side, left and right sides front-wheel 1 is carried out in the steering operation, the connecting rod 53 in draw operations left side by steering arm 25, sidepiece clutch 41 by the motion arm 51 in left side with the left side is operated to the partition state, thereby left rear wheel 2 becomes free rotation state.Under this situation, the sidepiece brake 41 on right side keeps drive state, and power still is passed to off hind wheel 2.

Like this, left and right sides front-wheel 1 is being carried out in the steering operation between the steering lock A2 on the set angle A1 on right side and right side or between the steering lock A2 in the set angle A1 in left side and left side, become following state: transmission of power is to the trailing wheel 2 in the left and right sides front-wheel 1 and the outside of turning, biography then is cut off to the power of the trailing wheel 2 of turning center side, thereby the trailing wheel 2 of pivot side becomes free rotation state, turns right like this or turns left.Thus, turn and the state that advances of rotation moderately, thereby reduced when turning the problem of the ground failure that the trailing wheel 2 by the turning center side causes while the trailing wheel 2 of turning center side becomes to be accompanied by.

[variation of the 2nd embodiment]

The suspension fork mechanism 267 of above-mentioned the 2nd embodiment also can replace aforementioned formation and constitute as following variation (1)～(3).

(1) as shown in figure 37, have shaft-like suspension framework 272, the carriage 272a that is fixed on the bottom of suspension framework 272 swings supported freely around the transverse axis core P4 of fulcrum post 31, suspension framework 272 slides up and down on the carriage 221b of the organism frame 21 that is inserted into freely about being fixed in, and is fixed with support component 272b in the upper end of suspension framework 272.

As shown in figure 37, the carriage 272a of suspension framework 272 and about the carriage 221b of organism frame 21 between, be embedded with the 1st long helical spring 273 outward, the support component 272b of suspension framework 272 and about the carriage 221b of organism frame 21 between, be embedded with the 2nd short helical spring 274 outward.On the carriage 272a of suspension framework 272, be fixed with the 1st cylinder part 275 (being equivalent to limiting mechanism), on the 1st cylinder part 275, be fixed with the 1st elastomeric element 277 (being equivalent to buffer gear) of rubber etc., on the support component 272b of suspension framework 272, be fixed with the 2nd cylinder part 276 (being equivalent to limiting mechanism), on the 2nd cylinder part 276, be fixed with the 2nd elastomeric element 278 (being equivalent to buffer gear) of rubber etc.

As mentioned above, constituted the suspension fork mechanism 267 of left and right sides trailing wheel 2 by suspension framework the 272, the 1st helical spring 273 and the 2nd helical spring 274 etc.

STA representation shown in Figure 37 be rice transplanting job state (for example about 40% of the full load condition of rice shoot mounting table 10, preparation rice shoot mounting table 237 and hopper 12 state).Under the rice transplanting job state, the 1st cylinder part 275 (the 1st elastomeric element 277) and about the carriage 221b of organism frame 21 between distance L 1 greater than the 2nd cylinder part 276 (the 2nd elastomeric element 278) and about the carriage 221b of organism frame 21 between distance L 2 (suspension fork mechanism 267 under the rice transplanting job state towards the actuating length of shrinkage limit greater than suspension fork mechanism 267 state towards the actuating length of the elongation limit under the rice transplanting job state).

Thus, as shown in figure 37, when suspension fork mechanism 267 begins to shrink and arrives in the shrinkage limit from the rice transplanting job state, the 1st cylinder part 275 (the 1st elastomeric element 277) with about the carriage 221b butt of organism frame 21.When suspension fork mechanism 267 begins elongation and arrives in the elongation limit from the rice transplanting job state, the 2nd cylinder part 276 (the 2nd elastomeric element 278) with about the carriage 221b butt of organism frame 21.

The structure of above-mentioned the 1st cylinder part 275 and the 2nd cylinder part the 276, the 1st elastomeric element 277 and the 2nd elastomeric element 278 and function also can be applied to the suspension fork mechanism 260 of left and right sides front-wheel 1.

(2) in example shown in Figure 38, replace the 1st cylinder part 275 and the 2nd cylinder part the 276, the 1st elastomeric element 277 and the 2nd elastomeric element 278 in the suspension fork mechanism 267 of aforementioned [variation 1], but the 1st helical spring 273 and the 2nd helical spring 274 are constituted the helical spring of irregular pitch, the helical spring of described irregular pitch has the bigger part 273a of pitch, 274a and less part 273b, the 274b of pitch.

STA representation shown in Figure 38 be rice transplanting job state (for example about 40% of the full load condition of rice shoot mounting table 10, preparation rice shoot mounting table 237 and hopper 12 state).Under the rice transplanting job state, the length of the 1st helical spring 273 is than the length of the 2nd helical spring 274 long (suspension fork mechanism 267 under the rice transplanting job state towards the actuating length of shrinkage limit greater than suspension fork mechanism 267 state towards the actuating length of the elongation limit under the rice transplanting job state).

Thus, as shown in figure 38, begin to shrink and arrive under the situation of shrinkage limit from the rice transplanting job state at suspension fork mechanism 267, the less part 273b of part 273a that the pitch of the 1st helical spring 273 is bigger and pitch similarly shrinks, the pitch of the part 273b that the pitch of while the 1st helical spring 273 is less disappears, thereby the less part 273b of the pitch of the 1st helical spring 273 loses as helical spring function, and suspension fork mechanism 267 is in the state that arrives shrinkage limit.Under this situation, thereby the pitch of the part 273a that the pitch of the 1st helical spring 273 is bigger disappear to continue to play a role as helical spring as yet, so the bigger part 273a of the pitch of the 1st helical spring 273 arrives the buffer gear of the impact in the shrinkage limits and works as absorbing suspension fork mechanism 267.

As shown in figure 38, begin from the rice transplanting job state to extend and arrive under the situation of the elongation limit at suspension fork mechanism 267, the less part 274b of part 274a that the pitch of the 2nd helical spring 274 is bigger and pitch similarly shrinks, the pitch of the part 274b that the pitch of while the 2nd helical spring 274 is less disappears, thereby the less part 274b of the pitch of the 2nd helical spring 274 loses as helical spring function, and suspension fork mechanism 267 is in the state that arrives the elongation limit.Under this situation, thereby the pitch of the part 274a that the pitch of the 2nd helical spring 274 is bigger disappear to continue to play a role as helical spring as yet, so the bigger part 274a of the pitch of the 2nd helical spring 274 arrives the buffer gear of the impact in the elongation limit and works as absorbing suspension fork mechanism 267.

The structure of the 1st helical spring 273 as described above and the 2nd helical spring 274 and function also can be applied to the suspension fork mechanism 260 of left and right sides front-wheel 1.

(3) Figure 39 shows another variation of the 2nd embodiment.

In the formation of Figure 39, on the base portion of the lower link 3a about linkage 3, be fixed with motion arm 3b (being equivalent to telescopic drive mechanism), under the state that seedling-transplanting device 5 rest on the ground, the motion arm 3b about linkage 3 from the top of suspension framework 261 upward away from.Thus, under the state that seedling-transplanting device 5 is driven by hydraulic cylinder 4 liftings in the scope of distance ground specified altitude, the motion arm 3b about linkage 3 not can with the top butt of suspension framework 261.

Drive and surpass in the specified altitude when seedling-transplanting device 5 is risen by hydraulic cylinder 4 apart from ground, the motion arm 3b about linkage 3 and the top butt of suspension framework 261, thereby suspension framework 261 is urged downwardly, and left and right sides trailing wheel 2 (back axle case 28) is lowered by driving (forcibly making suspension fork mechanism 267 to the elongate sides action).In this case, when seedling-transplanting device 5 is risen when being driven into upper limit position by hydraulic cylinder 4, about the fulcrum post 221a of scaffold 21 arrive the upper end of the slotted hole 261b of suspension framework, suspension fork mechanism 267 reaches the elongation limit.

The structure of motion arm 3b about linkage 3 as described above and function also can be applied to the suspension fork mechanism 267 of variation 1 or variation 2.

[summing up]

At last, feature illustrated in above-mentioned the 1st embodiment, the transmission mechanism 97,105,107 that is used to drive efferent 13 constitutes and also can be applied among the formation of the 2nd embodiment and each variation thereof.

Claims (10)

1. paddy field work vehicle, be that left and right sides front-wheel or trailing wheel are bearing in the paddy field work vehicle on the body via suspension fork mechanism, the gearbox (17) that will be delivered to respectively from the power of engine (19) on the left and right sides trailing wheel (2) is fixed on the body, and the efferent (13) that the stock in the hopper (12) is supplied with earthward is bearing on the body, it is characterized in that

The transmission mechanism (97,105,107) that is used to drive aforementioned efferent is arranged on aforementioned gearbox between the efferent.

2. paddy field work vehicle as claimed in claim 1, it is characterized in that, aforementioned suspension fork mechanism (267) is arranged on aforementioned each trailing wheel, and the back axle case (28) that supports each trailing wheel is bearing on the body via this suspension fork mechanism, and, be delivered to aforementioned back axle case from the power of the output shaft that travels (78) of aforementioned gearbox via universal joint (82) and power transmission shaft (84).

3. paddy field work vehicle as claimed in claim 2, it is characterized in that the aforementioned output shaft that travels (78) is outstanding from aforementioned gearbox, connects aforementioned power transmission shaft via aforementioned universal joint on its outstanding end, the transmission of power of the aforementioned thus output shaft that travels is to aforementioned back axle case

From the aforementioned power of output shaft output biography that travels to aforementioned transmission mechanism (97,105,107).

4. paddy field work vehicle as claimed in claim 3 is characterized in that, is positioned in aforementioned transmission mechanism near the part the aforementioned output shaft that travels, and is provided with the clutch (103) that transmits freely and cut off power.

5. paddy field work vehicle as claimed in claim 1, it is characterized in that, aforementioned suspension fork mechanism (267) is arranged on aforementioned each trailing wheel, and be provided with the back axle case (28) that each trailing wheel is supported via this suspension fork mechanism, aforementioned transmission mechanism is to pass between the support unit (21) of body of this back axle case (28) of supporting and this back axle case to dispose.

6. paddy field work vehicle as claimed in claim 1, it is characterized in that, aforementioned suspension fork mechanism (267) is arranged on aforementioned each trailing wheel, and be provided with the back axle case (28) that each trailing wheel is supported via this suspension fork mechanism, aforementioned transmission mechanism arranged at support unit (21) upper support of the body that this back axle case is supported.

7. paddy field work vehicle as claimed in claim 1 is characterized in that, aforementioned suspension fork mechanism (260,267) is arranged on aforementioned each front-wheel and each trailing wheel.

8. paddy field work vehicle as claimed in claim 1, it is characterized in that, be provided with the elongation limit of the aforementioned suspension fork mechanism of decision and the limiting mechanism (75,76) of shrinkage limit, by this limiting mechanism, make that the actuating length towards shrinkage limit (L1) ratio of suspension fork mechanism is big towards the actuating length (L2) of the elongation limit.

9. paddy field work vehicle as claimed in claim 8 is characterized in that, is provided with to absorb the buffer gear (77,78) that aforementioned suspension fork mechanism arrives the impact in the elongation limit and the shrinkage limit.

10. paddy field work vehicle as claimed in claim 1 is characterized in that, aforementioned suspension fork mechanism (267) is arranged on aforementioned each trailing wheel, and paddy-field-working device (5) via elevating mechanism (4) can being attached at After-Body from the mode of ground rise or fall,

Be provided with when aforementioned paddy-field-working device and rise to above in the specified altitude, forcibly make the pressure elongation mechanism (3b) of aforementioned suspension fork mechanism elongation.

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