CN201797732U - Variable-speed operating structure of paddy-field operation machine - Google Patents

Abstract

The utility model provides a variable-speed operating structure of a paddy-field operation machine, which is capable of switching and operating a speed change lever highly efficiently and avoiding complex structures when gears are added, is capable of running well for operation, and is capable of realizing a running state reducing running speed to the maximum. The variable speed operating structure comprises a gear type transmission which allows a difference between a variable ratio in high-speed advancing variable-speed state and a variable ratio in medium-speed advancing variable-speed state to be smaller than a difference between the variable ratio in medium-speed advancing variable-speed state and a variable ratio in low-speed advancing variable-speed state. The speed change gear (99) can be operated to freely switch among a high-speed advancing operation position (F3), a medium-speed advancing operation position (F2), a low-speed advancing operation position (F1) and a backing operation position (R), and the high-speed advancing operation position and the backing operation position are arranged at positions with opposite states allowing mutual switching operations along with motion operation along a fore-and-aft direction of a machine body.

Description

The variable speed operation structure of working in paddy field

Technical field

The utility model relates to the variable speed operation structure of the working in paddy field with driving transmission and gear change hand lever, this driving transmission can freely switch to the speed change state that advances at utmost speed with the speed change state of travelling of the body that travels, the middling speed that speed is lower than the described speed change state that the advances at utmost speed speed change state of advancing, speed be lower than described middling speed advance speed change state the low-speed forward speed change state and retreat each state of transport condition, gear change hand lever is assigned and is formed the described speed change state that advances at utmost speed, the described middling speed speed change state of advancing, described low-speed forward speed change state, the described instruction that retreats transport condition.

Background technology

Rice transplanter as an example of above-mentioned working in paddy field had following structure in the past, promptly, be to switch to " F2-H " by operation to gear change hand lever, " F2-L ", " F1-H ", " F1-L " these 4 shelves are as the travel structure of speed change state of the advancing of body of travelling, the operating position of assigning the speed change state that advances at utmost speed (F2-H) instruction therein and assigning retreats when carrying out handover operation between the going-back position that transport condition " R " instructs, temporarily gear change hand lever is switched to the neutral gear operating position N that is positioned at left and right sides middle position, gear change hand lever is moved to advance at utmost speed the position of usefulness or retreat at the enterprising line operate of fore-and-aft direction and use the position, and, on left and right directions, carry out move operation and gear change hand lever is switched to the operating position of expectation, that is, assign the operating position that forms the speed change state instruction that advances at utmost speed and form the going-back position (for example with reference to patent documentation 1) that retreats the transport condition instruction with assigning.

In addition, though write up not in the patent documentation 1, but the difference of each gear ratio that in the past was set at each grade is all little, even make the gear that switches to high-speed side from the gear of low speed side by shelves, gear ratio does not have big variation yet, can suitably tackling according to various job statuses in the field.

Patent documentation 1:JP spy opens flat 5-44820 communique.

In the above-mentioned existing structure, form when carrying out handover operation between the going-back position that retreats the transport condition instruction assigning the operating position that forms the speed change state instruction that advances at utmost speed and assign by gear change hand lever, complex operation also has improved space.

For example, rice transplanter as working in paddy field, when in the field, carrying out the seedling growing operation, when switching travel direction on the limit, field, sometimes occur alternatively that driving transmission is switched to the speed change state that advances at utmost speed and carry out the state of operation and retreat the state that travels, there is the numerous and diverse shortcoming of handover operation of gear change hand lever in this case in structure in the past.

In addition, rice transplanter or directly in the such working in paddy field of sower, can carry out operation efficiently when carrying out operation in the field, preferably can travel with speed as quickly as possible according to the situation of field face, but recently, when from the field, crossing ridge after the end of job in the field and withdrawing from, perhaps, before operation begins, enter in the field when waiting by ridge, wish to make travel body so that the slow to greatest extent state of travel speed travel.

But, according to existing structure, it is all little structure of difference that is set at each gear ratio of each grade, even make the gear that switches to high-speed side from the gear of low speed side by shelves, gear ratio does not have big variation yet, because the difference of a plurality of grades the speed change state gear ratio separately of travelling is little, so occurring so that during the transport condition that travels under the state that travel speed reduces to greatest extent, needing increases the gear number, thereby has baroque shortcoming.

But, can form the structure of using quiet oil pressure stepless speed change device (HST) to make the travel speed speed change as the structure that can realize the transport condition that runs at a low speed with the utmost point as described above, but be to use the structure of so quiet oil pressure stepless speed change device, transmission efficiency is lower than gear type speed change gear, existence can not obtain the shortcoming of the sufficient operating speed corresponding with the power size of engine, in addition, also exist and make structure become complexity and shortcomings such as cost height.

The utility model content

The purpose of this utility model is to provide a kind of variable speed operation structure of working in paddy field, the gear type speed change gear that use the transmission efficiency height, can reduce cost, handover operation gear change hand lever expeditiously, and, increase the gear number and can not cause structure complicated, can carry out operation well and travel, and can realize the transport condition that travels with the state that reduces travel speed to greatest extent.

The variable speed operation structure of working in paddy field of the present utility model, have driving transmission and gear change hand lever, described driving transmission can freely switch to the speed change state that advances at utmost speed respectively with the speed change state of travelling of the body that travels, the middling speed that speed is lower than the described speed change state that the advances at utmost speed speed change state of advancing, speed be lower than described middling speed advance speed change state the low-speed forward speed change state and retreat transport condition, described gear change hand lever instructs to form the described speed change state that advances at utmost speed, the described middling speed speed change state of advancing, described low-speed forward speed change state, the described transport condition that retreats, wherein, first feature structure is, described driving transmission is made of the gear type speed change gear, this gear type speed change gear constitutes gear ratio under the described speed change state that advances at utmost speed and described middling speed and advances the difference of the gear ratio under the speed change state less than described middling speed the poor of gear ratio under the speed change state and the gear ratio under the described low-speed forward speed change state that advance, described gear change hand lever is operated and can freely switches to the operating position that advances at utmost speed that is used to switch to the described speed change state that advances at utmost speed respectively, be used to switch to the advance middling speed forward operation position of speed change state of described middling speed, be used to switch to the low-speed forward operating position of described low-speed forward speed change state, be used to switch to the described back operation position that retreats transport condition, and described advance at utmost speed operating position and described back operation position are set at and are being accompanied by along the move operation of body fore-and-aft direction and can carry out under the state of mutual handover operation in opposite directions position.

Promptly, driving transmission is made of the gear type speed change gear, this gear type speed change gear constitutes gear ratio under the speed change state that advances at utmost speed and middling speed and advances the difference of the gear ratio under the speed change state less than middling speed the poor of gear ratio under the speed change state and the gear ratio under the low-speed forward speed change state that advance, thereby, can be set to be suitable for the speed change state that operation is travelled in the field travel speed is travelled as advance at utmost speed speed change state and the middling speed speed change state of advancing, and, for example can be set at the speed change state of travelling with the travel speed of utmost point low speed as the low-speed forward speed change state in order to cross over ridge, even do not increase the gear number, also the operation that can carry out in the field is well on one side travelled, under the state that to greatest extent reduce travel speed travel on one side.

In addition, when for example in the field, carrying out operation, in order to switch travel direction on the limit, field, alternatively switch to the state that carries out operation while advancing and retreat transport condition, in this case, at the handover operation gear change hand lever between operating position and the back operation position that advances at utmost speed, but operating position and back operation position are arranged at and are being accompanied by along the move operation of body fore-and-aft direction in opposite directions position under the state of handover operation reciprocally, so can be by easy operation switching gear change hand lever because advance at utmost speed.

But, in common job state, carry out handover operation between operating position and the back operation position advancing at utmost speed as described above, but load is bigger if travel, then gear change hand lever is operating as the middling speed speed change state of advancing from the operating position that advances at utmost speed, perhaps shift when crossing ridge and travel, gear change hand lever can be operating as the low-speed forward speed change state from the operating position that advances at utmost speed from common operation.

Thereby, the variable speed operation structure of following working in paddy field can be provided, promptly, the gear type speed change gear that use the transmission efficiency height, can reduce cost, handover operation gear change hand lever expeditiously, and, increase the gear number and can not cause structure complicated, can carry out operation well and travel, and can be implemented in the transport condition that travels under the state that travel speed is reduced to greatest extent.

Second feature structure of the present utility model is, on the basis of first feature structure, described gear change hand lever is supported on the supporting member, and described gear change hand lever can be respectively be operated to be the mode that cross freely swings on body left and right directions and body fore-and-aft direction, and has the attended operation mechanism that connects described gear change hand lever and described driving transmission, make and be rocked to from neutral position under the state of the either party right-hand and the left at described gear change hand lever, by described gear change hand lever being operated to the either party in the place ahead and the rear, switch to described high speed and use the forward operation position, by being operated to the opposing party in the place ahead and the rear, switch to described back operation position.

According to second feature structure, be the supported gear change hand lever of mode that cross freely swings is rocked to from neutral position under the state of the either party right-hand and the left being operated on body left and right directions and body fore-and-aft direction respectively, by this gear change hand lever being operated to the either party in the place ahead and the rear, driving transmission switches to uses the forward operation position at a high speed.

In addition, under either party's the state, by this gear change hand lever being operated to the opposing party in the place ahead and the rear, driving transmission switches to the back operation position gear change hand lever is rocked to right-hand and left from neutral position.

Like this, by only operation gear change hand lever such simple operations on fore-and-aft direction, just speed change state and retreat the speed change state of switching driving transmission between the transport condition can advanced at utmost speed.

The 3rd feature structure of the present utility model is, on the basis of second feature structure, second connecting elements that described attended operation mechanism has first connecting elements that the first variable speed operation member used with variable speed operation is connected and is connected with the second variable speed operation member that variable speed operation is used, and, the interlock control member that can swing with described gear change hand lever one on body left and right directions and body fore-and-aft direction respectively being operated is rocked to from neutral position under the state of the either party right-hand and the left, by the described interlock control member of operation on the body fore-and-aft direction, interlock is operated described first connecting elements, and, be rocked to from described neutral position under the state of the opposing party right-hand and the left at described interlock control member, by the described interlock control member of operation on the body fore-and-aft direction, interlock is operated described second connecting elements, by operation to described first connecting elements, described driving transmission described advance at utmost speed speed change state and described retreat to travel switch between the speed change state, and, by operation to described second connecting elements, described driving transmission advances in described middling speed and switches between speed change state and the described low-speed forward speed change state, have and to carry out the mobile limiting member that freely switches, when described interlock control member is in described neutral position, described mobile limiting member forms described first connecting elements of restriction and the active state that move of described second connecting elements on the body fore-and-aft direction, when described interlock control member is rocked to right-hand or during left from described neutral position, described mobile limiting member is removed the restriction of described first connecting elements and described second connecting elements is formed the non-active state that permission moves up in the body front and back, and described first connecting elements and described second connecting elements form respectively on the body fore-and-aft direction and be in the overlapping state of described interlock control member of described neutral position.

According to the 3rd feature structure, the interlock control member that can swing with the gear change hand lever one on body left and right directions and body fore-and-aft direction respectively being operated is rocked to from neutral position under the state of the either party right-hand and the left, by this interlock control member of operation on the body fore-and-aft direction, interlock is operated first connecting elements, thereby the first variable speed operation member of using with the variable speed operation that this first connecting elements is connected is operated, and driving transmission switches to advance at utmost speed speed change state and any state that retreats in the speed change state of travelling.

Be rocked to from neutral position under the state of the opposing party right-hand and the left at the interlock control member, by this interlock control member of operation on the body fore-and-aft direction, interlock is operated second connecting elements, the second variable speed operation member that variable speed operation is used is operated, thereby driving transmission switches to advance any state in speed change state and the low-speed forward speed change state of middling speed.

And when the interlock control member was in neutral position, mobile limiting member switched to active state, first connecting elements and second connecting elements mobile being limited on the body fore-and-aft direction.By restriction is mobile in this wise, even the maloperation gear change hand lever is the interlock control member on fore-and-aft direction, first connecting elements and second connecting elements can not be operated yet.In addition, when described interlock control member is rocked to right-hand or during left from described neutral position, mobile limiting member lifts restrictions, switch to the non-active state that allows the interlock control member to move up, allow first connecting elements or second connecting elements to move up in the body front and back in the body front and back.

In addition, first connecting elements and second connecting elements form respectively on the body fore-and-aft direction and are in the overlapping form of interlock control member of neutral position, thereby, can be by pining down interlock control member unnecessary movement on fore-and-aft direction at mobile first connecting elements and second connecting elements that is moved the limiting member restriction on the fore-and-aft direction.

Thereby, when gear change hand lever is in neutral position, even unexpectedly on fore-and-aft direction, operate gear change hand lever because of maloperation etc. sometimes, can not carry out variable speed operation yet, and, interlock control member and the restriction mutually of first connecting elements, second connecting elements by engaging, thus the interlock control member can be maintained neutral position reliably.

The 4th feature structure of the present utility model is, on the basis of the 3rd feature structure, has lever operated guide portion, and this lever operated guide portion has: the move left and right path, and its permission is operated described interlock control member from neutral position to the body left and right directions; The left side moves forward and backward the path, and its permission is operated described interlock control member from the left end position in move left and right path to the body fore-and-aft direction; The right side moves forward and backward the path, and its permission is operated described interlock control member from the right-hand end position in described move left and right path to the body fore-and-aft direction; Has the neutral gear force application mechanism, under described interlock control member is positioned at state on the described move left and right path, operating on the described move left and right path under the state of described interlock control member overcoming active force by manual operation, described interlock control member is pushed the application of force, so that described interlock control member restores from the left and right directions both sides to described neutral position; Make described neutral gear force application mechanism and described mobile limiting member interlock, switch to described active state when restoring to described neutral position, switch to described non-active state when being operated to the left end position in described move left and right path or right-hand end position when the active force that overcomes described neutral gear force application mechanism and with described interlock control member at described interlock control member.

According to the 4th feature structure, owing to have lever operated guide portion, thereby can move forward and backward path and right side along move left and right path, left side and move forward and backward the path movement operation along with the operation of gear change hand lever being operated interlock control member that one moves, can not be operated to the position except that these positions, thereby can be can not produce this interlock control member of disadvantageous state of operation, so-called unfavorable being meant with the state that is not connected with first connecting elements or second connecting elements operated on the body fore-and-aft direction etc.; And, the interlock control member is restored to neutral position by the neutral gear force application mechanism application of force under the state that is positioned on the move left and right path, mobile limiting member and interlock control member interlock and be in active state, thus can be that gear change hand lever remains on neutral position reliably with the interlock control member.

And, by the manual operation gear change hand lever, when the active force that overcomes the neutral gear force application mechanism is operated to the left end position in move left and right path or right-hand end position with the interlock control member, mobile limiting member and neutral gear force application mechanism interlock and switch to non-active state, thus can carry out variable speed operation well.

Thereby, when gear change hand lever is in neutral position, gear change hand lever is subjected to mobile on fore-and-aft direction in unnecessary movement on the fore-and-aft direction and is moved first connecting elements of limiting member restriction and pining down of second connecting elements, and, do not need to be used for mobile limiting member is switched to the special-purpose member of active state and non-active state, and can carry out variable speed operation well.

The 5th feature structure of the present utility model is, on the basis of the 3rd feature structure or the 4th feature structure, on the body that travels, be connected with can free lifting apparatus for work,

And the variable speed operation structure of this working in paddy field has: actuator, and it drives described apparatus for work lifting; The fallback state detecting sensor, it detects described driving transmission and whether switches to the described speed change state of travelling that retreats; Control device, when this fallback state detecting sensor detects describedly when retreating transport condition, control device makes described actuator action so that described apparatus for work rises; Described fallback state detecting sensor constitutes by described first connecting elements to described attended operation mechanism carries out detection effect, detects described driving transmission and whether switches to the described transport condition that retreats.

According to the 5th feature structure, when the fallback state detecting sensor detects when retreating transport condition, make the actuator action and apparatus for work is risen, thereby, retreat travel in apparatus for work contact ridge, perhaps the apparatus for work state that keeps in touch the field face unexpectedly retreats and travels, thereby, can avoid damaging rough sledding generations such as apparatus for work, special testing agency need not be set in order to avoid cause structure complicated, can effectively utilize first connecting elements of attended operation mechanism, detect driving transmission and whether switch to and retreat transport condition.

Description of drawings

Fig. 1 is the unitary side view of sitting type rice transplanter.

Fig. 2 is the whole vertical view of sitting type rice transplanter.

Fig. 3 is the cross-sectional vertical view of gearbox body.

Fig. 4 is the cross-sectional vertical view of gearbox body.

Fig. 5 is near the cross-sectional vertical view of output shaft of gearbox body.

Fig. 6 is the end view of the bindiny mechanism that uses of expression variable speed operation.

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

Fig. 8 is the end view of the front portion of gearbox body.

Fig. 9 is the vertical view of the front portion of gearbox body.

Figure 10 is the end view of attended operation mechanism.

Figure 11 is the front view of attended operation mechanism.

Figure 12 is the vertical profile front view of attended operation mechanism.

Figure 13 is the cross-sectional vertical view of attended operation mechanism.

Figure 14 represents the vertical view of lever operated guide portion.

Figure 15 is the exploded perspective view of the part of attended operation mechanism.

Figure 16 is the vertical view of the variable speed operation state of expression gear change hand lever.

Figure 17 is the figure of the dependency relation between the expression gear and the speed of a motor vehicle.

Embodiment

Based on accompanying drawing the situation that the embodiment of the drive mechanism of workover rig of the present utility model is used for saddle type rice transplanter is described below.

As shown in Figure 1, as mobile devices, the oil cylinder 4 that has linkage 3 and 3 liftings of drive link mechanism at the rear portion of the body A that travels with pair of right and left front-wheel 1 and pair of right and left trailing wheel 2 as actuator, in the back support of linkage 3 seedling growing device 5 as apparatus for work is arranged, thereby constitute saddle type rice transplanter as an example of workover rig.

As shown in Figure 1, seedling growing device 5 has transmission case 6, be supported on the rear portion of transmission case 6 and can be driven and rotate freely plant case 7, be formed on a pair of arm 8, ground connection hull 9 and the seedling carrying base 10 etc. of planting of planting case 7 two ends, along with seedling carrying base 10 be driven and about back and forth traverse feed, plant case 7 and be driven and rotate, plant arm 8 and alternatively take out rice shoot and plant on the face of field from the bottom of seedling carrying base 10.

As shown in Figure 1, the hopper 12 and the unloading part 13 that store fertilizer are fixed on the rear side of driving seat 11, have fan blower 14 at the downside of driving seat 11.In addition, on ground connection hull 9, has the ditch of work device 15, at unloading part 13 and make to be connected with between the ditch device 15 flexible pipe 16, along with planting of above-mentioned rice shoot, send the fertilizer of ormal weight by unloading part 13 from hopper 12 at every turn, air-supply by fan blower 14 makes fertilizer be supplied to by flexible pipe 16 and makes ditch device 15, and fertilizer is supplied to the field face via making ditch device 15.

As shown in Figure 1, be fixed with gearbox body 17A in the front portion of the body A that travels, supporting bracket 18 upper supports in the front portion that is connected in gearbox body 17A have engine 19.Horizontal sidepiece is connected with left and right sides front truck axle box 20 about gearbox body 17A, left and right sides front-wheel 1 with can around the longitudinal axis of left and right sides front truck axle box 20 freely control this left and right sides front-wheel 1 towards mode supported.

Then, drive mechanism is described.As Fig. 3～shown in Figure 5, the power of engine 19 is passed to the driving shaft 71 that transmission case 17B that the speed change gear that is connected with the anterior horizontal side of gearbox body 17A uses is had via driving belt 70, the power of this driving shaft 71 is passed to as the gear type main transformer quick-mounting of driving transmission via main clutch 72 and puts 21, put 21 power that carried out speed change by the main transformer quick-mounting and be passed to front-wheel 1 and trailing wheel 2 via secondary speed-changing device 74, on the other hand, put 21 power that carried out speed change via driving transmission between strain 50 with plant clutch 57 and be passed to seedling growing device 5 by the main transformer quick-mounting.

Driving belt 70 is wound on the input belt wheel 70B that is had on the driving shaft 71 of the output pulley 70A that has on the output shaft 19a of engine 19 and transmission case 17B.The outside at input belt wheel 70B disposes cooling fan 70C, and this cooling fan 70C is being connected on the driving shaft 71 with the mode of driving shaft 71 one rotation.The outside case part 17Ba bolt of transmission case 17B is connected on the inboard case part of transmission case 17B, and being formed with on the part of the peripheral part that is positioned at driving shaft 71 with the axis of driving shaft 71 is coniform the 17BT on summit.In addition, in the bearings of the outside of transmission case 17B case part 17Ba that also to be formed with the axis of speed change output shaft 75 on the part of speed change output shaft 75 be coniform the 17BT on summit, this coniform 17BT links to each other with coniform 17BT of driving shaft 71 peripheral parts is local.The outer peripheral face of above-mentioned coniform 17BT, 17BT is provided with radial rib, realizes the miniaturization of outside case part 17Ba by coniform 17BT, 17BT, and can guarantee necessary strength.

On input belt wheel 70B, be formed with: belt wheel main part 70Ba, it forms along the cone shape of the outer surface of coniform the 17BT of outside case part 17Ba; The belt coiling 70Bb of portion, it is provided in the periphery of this belt wheel main part 70Ba.Be formed with the recess 70Bc of cone shape in the inboard of belt wheel main part 70Ba, under the part of coniform the 17BT of outside case part 17Ba enters state among this recess 70Bc, input belt wheel 70B be connected with driving shaft 71.Thus, formed the input belt wheel 70B big more space Q of the distance on the axis direction of driving shaft 71 between outer circumferential side and cooling fan 70C more, in the Q of this space, make cooling air that cooling fan 70C produces pass to the lateral outer side of transmission case 17B, thereby can cool off the lateral external surface of transmission case 17B efficiently by compact structure with the state flow that is difficult for being transfused to belt wheel 70B and hinders.

The main transformer quick-mounting is put 21 and is constituted and can freely switch to low-speed forward speed change state (below be called advance first grade), middling speed advance speed change state (below be called advance second grade), the speed change state that advances at utmost speed (below be called the third gear of advancing) and retreat speed change state (below be called fallback state) by will the travel speed change state of travelling of body A of operation, that is to say, can freely switch to and advance 3 shelves and retreat these 4 gears of 1 shelves.

Promptly, as shown in Figure 3, the main transformer quick-mounting is put in 21, driving shaft 71, speed change output shaft 75, counter-rotating with relay axis 76 each comfortable rotation towards being supported on respectively on the transversely arranged direction on the transmission case 17B, and driving shaft 71, speed change output shaft 75, counter-rotating can rotate freely with relay axis 76.And, two upstream side gears 77,78, respectively with arrange along the axis direction of driving shaft 71 and upstream side gear 77,78 respectively being supported on state on the driving shaft 71 via needle bearing 149 with respect to driving shaft 71 free rotation mode, outer embedding is installed on the driving shaft 71, and, above-mentioned two upstream side gears 77,78 form be connected with can one the state of rotation.

At two upstream side gears 77, have on the upstream side that is positioned at main clutch 72 1 sides first gear 77 in 78 as the driven wheel portion 79 of the first grade of usefulness of advancing of gear teeth portion and the driven wheel portion 80 of the second grade of usefulness of advancing, on upstream side second gear 78 that is positioned at main clutch 72 opposite sides, have driven wheel portion 81 that uses as the third gear of advancing of gear teeth portion and the driven wheel portion 82 that retreats usefulness, wherein, the driven wheel portion 82 that retreats usefulness forms the state that meshes with relay gear 84, and this relay gear 84 can be supported on counter-rotating with on the relay axis 76 via bearing 83 with rotating freely.

By connecting pin 85 being embedded in the driven wheel portion 81 that the third gear of advancing of the driven wheel portion 80 of the second grade of usefulness of advancing that is installed in adjacent mutually upstream side first gear 77 and upstream side second gear 78 uses along the axis direction of driving shaft 71, thus, two upstream side gears 77,78 are connected can one rotating.

Further be specifically described, for two adjacent upstream side gears 77,78, under the approaching state of the driven wheel portion that uses in the third gear of advancing that makes upstream side first gear 77 81 as gear teeth portion as the driven wheel portion 80 of the second grade of usefulness of advancing of gear teeth portion and upstream side second gear 78, and, along the axis direction of driving shaft 71 with connecting pin 85 embed be installed in driven wheel portion 80 in the gear side wall portion between radial outer end portion and radial inner end of the driven wheel portion 81 that the gear side wall portion between radial outer end portion and the radial inner end and the third gear of advancing are used, thereby with two adjacent upstream side gears 77,78 are connected can one rotating.

In addition, on speed change output shaft 75 outside embedding two change- speed gearings 86,87 are installed, these two change- speed gearings 86,87 can one rotate freely, and by the operation can on axis direction, be free to slide.The driven gear portion 89 that has the driven gear portion 88 of the first grade of usefulness of advancing and the second grade of usefulness of advancing on the first stud gear 86 that is positioned at main clutch 72 1 sides in two change- speed gearings 86,87 has driven gear portion 90 that the third gear of advancing uses and the driven wheel portion 91 that retreats usefulness on the second stud gear 87 that is positioned at main clutch 72 opposite sides.

First stud gear 86 be set to by operation can be free to slide to first grade with position, second grade with position and these 3 positions of neutral position, wherein, first grade is meant the driven gear portion 88 of the first grade of usefulness of advancing and driven wheel portion 79 position engaged of the first grade of usefulness of advancing with the position, second grade is meant the driven gear portion 89 of the second grade of usefulness of advancing and driven wheel portion 80 position engaged of the second grade of usefulness of advancing with the position, neutral position is meant all position engaged not of each driven gear portion; Second stud gear 87 is set to can be free to slide to third gear by operation and uses position, going-back position and these 3 positions of neutral position, wherein, third gear is meant driven wheel portion 81 position engaged that the third gear of advancing the driven gear portion 90 that uses and the third gear of advancing are used with the position, going-back position is meant that driven gear portion 91 that retreats usefulness and relay gear 84 position engaged that retreat usefulness, neutral position are meant all position engaged not of each driven gear portion.

That is to say, when second stud gear 87 being operated to neutral position and first stud gear 86 is operated to first gear and puts, switch to and advance first grade, when second stud gear 87 being operated to neutral position and first stud gear 86 is operated to second gear and puts, switch to and advance second grade, when first stud gear 86 being operated to neutral position and second stud gear 87 is operated to the third gear position, switch to the third gear of advancing, when first stud gear 86 being operated to neutral position and second stud gear 87 is operated to going-back position, switch to fallback state.

As shown in Figure 7, be used to operate first stud gear 86 moves it on axis direction the first variable speed operation member 92, be integrally formed on the action bars 94, action bars 94 can be supported on the gearbox body 17A with being free to slide, and by ball detent (ball detent) mechanism B holding position, slide by operating this action bars 94, first stud gear 86 freely can be switched to described 3 positions.In addition, being used to operate second stud gear 87 makes its second mobile on axis direction variable speed operation member 93 also identical with the first variable speed operation member 92, be formed on the action bars 95, this action bars 95 constitutes the B holding position by ball detent mechanism, slide by operating this action bars 95, second stud gear 87 freely can be switched to described 3 positions.Described each action bars 94,95 forms the state of giving prominence in the outside of transmission case 17B, the operating structure back narration of above-mentioned action bars 94,95.

Described change- speed gearing 86,87 constitutes, and makes the k of the portion that is stuck that engages with variable speed operation member 92,93 form the state of the end of a side on the axis direction that is positioned at speed change output shaft 75.That is, two change-speed gearing 86,87 k of the portion that is stuck separately form the state of the end (Fig. 7 is positioned at the end in left side) of the same side on the axis direction that is arranged in speed change output shaft 75.And as shown in Figure 3, when change-speed gearing 86 was in neutral position, from observing perpendicular to the direction of speed change output shaft 75 axis, the k of the portion that is stuck of change-speed gearing 86 was in the state overlapping with the driven wheel portion 79 of the first grade of usefulness of advancing.In addition, when change-speed gearing 87 was in neutral position, from observing perpendicular to the direction of speed change output shaft 75 axis, the k of the portion that is stuck of change-speed gearing 87 was in the overlapping state of the driven wheel portion that uses with the third gear of advancing 81.

As shown in figure 17, the main transformer quick-mounting is put 21 and is constituted, the gear ratio α 3 of the third gear of advancing (F3) and the poor Δ α b of the poor Δ α a of the gear ratio α 2 of advance second grade (F2) less than the gear ratio α 1 of the gear ratio α 2 of advance second grade (F2) and advance first grade (F1).

If describe in detail, as shown in figure 17, to connect the state of initial point and the straight line L of the third gear F3 that advances, in other words, with the constant state of the difference of gear ratio, compare with the situation that each gear ratio of a plurality of gears is set, the gear ratio α 2 that forms advance second grade (F2) sets greatly, the state that the gear ratio α 1 of advance first grade (F1) sets for a short time.

And secondary speed-changing device 74 switches to high-speed side and is meant that the gear ratio of secondary speed-changing device 74 is set to form is not suitable for the travel speed that suits to travel travelling on the field on highway.Thereby, when in the field, carrying out operation, keep the state that secondary speed-changing device 74 switches to low speed side.

Then, illustrate that the main transformer quick-mounting puts 21 variable speed operation structure.

As Fig. 2 and shown in Figure 6, the leftward position of steering dish 98 that is arranged at the steering wheel pillar 97 of body manoeuvre portion 96 front portions in setting has and is used to operate the main transformer quick-mounting and puts 21 gear change hand lever 99, can be along bullport 152 these gear change hand levers 99 of operation.

As shown in figure 16, this gear change hand lever 99 is operated and can freely switches to and the main transformer quick-mounting is put 21 switches to first grade the low-speed forward operating position (below be called first gear that advances put (F1)) of advancing, the main transformer quick-mounting is put 21 to switch to and advances second grade middling speed forward operation position (below be called second gear that advances put (F2)) and the main transformer quick-mounting put each position of 21 operating positions that advance at utmost speed that switch to the third gear of advancing (below be called the third gear position (F3) of advancing), and, the main transformer quick-mounting is put 21 switches to the back operation position (R) of fallback state and the third gear position (F3) of advancing and be arranged on along with along body forward-and-rearward move operation and the mutual state of handover operation position in opposite directions.

Gear change hand lever 99 has: vertical shaft part 99a, and it is configured to be communicated with up and down the state of the peristome 97A of the elongated rectangle in the front and back that form on the upper surface of steering wheel pillar 97 lateral sides; Handle part 99b, it is arranged on the extension end of this vertical shaft part 99a.Vertical shaft part 99a of gear change hand lever 99 extends to the top of lateral outer side obliquely from the connection on the peristome 97A, and this elongated end bending is extended obliquely to the back upper place.The handle part 99b of gear change hand lever 99 with observe from the side and state configuration that steering dish 98 is overlapping near the outer circumference end of steering dish 98.Thus, the handle guiding piece that stretches out towards the horizontal side and the rear side of steering wheel pillar 97 etc. is not set, makes steering wheel pillar 97 peripheral densifications, and the handle part 99b of gear change hand lever 99 can be configured near the position of the easy operating the steering dish 98.

And, have and connect gear change hand lever 99 and main transformer quick-mounting and put 21 attended operation mechanism 101, make gear change hand lever 99 with supported by the operation mode that can on body left and right directions and body fore-and-aft direction, freely swing respectively, be rocked under the state of left from neutral position N at gear change hand lever 99, gear change hand lever 99 is operated to the place ahead, thereby switch to the third gear position (F3) of advancing, gear change hand lever 99 is operated to the rear, thereby switches to back operation position (R).

The following describes attended operation mechanism 101.As shown in Figure 6, attended operation mechanism 101 is set to be positioned at the state at base end side place of the gear change hand lever 99 of steering wheel pillar 97 inside.And, as Figure 10～Figure 12, shown in Figure 15, observe the supporting member 100 upper edge body left and right directions be approximate " U " word shape in the side and set up and be supported with back shaft 103, wherein, supporting member 100 is fixed on from the longitudinal carrier 102 extended framework 102A of steering wheel pillar 97.First boss member 104 is arranged and first boss member 104 can be rotated freely in these back shaft 103 upper supports, this first boss member 104 is used for can supporting gear change hand lever 99 around the mode that axis of pitch X1 freely rotates with gear change hand lever 99, the upper end that is fixed on the connector 105 on this first boss member 104 in one is connected with second boss member 106, and this second boss member 106 is used for can supporting gear change hand lever 99 around the mode that front and back axis X2 freely rotates with gear change hand lever 99.

Attended operation mechanism 101 has the interlock control member 107 that pole bending is constituted for " L " word roughly, the top 107A of the fore-and-aft direction posture of this interlock control member 107 is being installed in second boss member 106 with respect to the mode that second boss member 106 is freely rotated is embedded, and, the bottom 107B above-below direction posture of this interlock control member 107 is extended downwards, one is fixedly connected with and connects with member 153 on this interlock control member 107, and this connection is connected on the bottom of gear change hand lever 99 with stationary state with member 153.That is to say, this interlock control member 107 form be operated and can with the structure of gear change hand lever 99 one swings.

Thereby, gear change hand lever 99 is supported on the supporting member 100, and be operated around axis (axis of pitch X1) rotation by back shaft 103, can on the body fore-and-aft direction, freely swing, and be operated around axis (front and back axis X2) rotation by second boss member 106, can on the body left and right directions, freely swing.

As Figure 10～Figure 13, shown in Figure 15, place, the left and right sides in first boss member 104 of back shaft 103 has first connecting elements 109 and second connecting elements 108, and it is can be around the mode that the axis X 1 of back shaft 103 is freely rotated supported that this first connecting elements 109 and second connecting elements 108 are.First connecting elements 109 has: the 109A of pivot branch, and it can be supported on the back shaft 103 freely to rotate; The 109B of snap action portion, it forms for approximate " L " word shape from the 109A of this pivot branch one extension downwards and bending; Operating portion 109C, from the 109A of pivot branch rearward one extend and pivotal support ground is connecting the distolateral of pull bar 111.Second connecting elements 108 and first connecting elements 109 are same, have the distolateral operating portion 108C that the 108A of pivot branch, the 108B of snap action portion and pivotal support ground is being connected pull bar 110.

As Fig. 7～shown in Figure 9, near the action bars 94 that the variable speed operation of gearbox body 17A is used foreign side's side has the rotating operation axle 112 that can freely rotate around self axis, to connect another of pull bar 110 distolateral with supporting being formed at motion arm 113 head lamp brush guard pivots on the side of this rotating operation axle 112, have card at the opposite side of rotating operation axle 112 and end the control member 114 that acts among the 94A of the portion that is operated at action bars 94, along with push-and-pull operation pull bar 110 up and down, rotating operation axle 112 rotates and can slide by operating operation bar 94.

The action bars 95 that variable speed operation is used is also identical with action bars 94, have the rotating operation axle 115 that can freely rotate around self axis, pivotal support connecting pull bar 111 another distolateral motion arm 116, block the control member 117 that only in the 95A of the portion that is operated of action bars 95, acts on, along with push-and-pull operation pull bar 111 up and down, rotating operation axle 115 rotates and can slide by operating operation bar 95.

As Figure 11 and shown in Figure 12, first connecting elements 109 and second connecting elements 108 have the 108B of snap action portion, 109B and operating portion 108C, the 109C that forms by bending sheets separately, the 108B of snap action portion of the 109B of snap action portion of first connecting elements 109 and second connecting elements 108, the leading section that forms their lower side toward each other and aspectant state, and first connecting elements 109 and second connecting elements 108 are formed with the engaging recessed part 119,120 that interlock control member 107 engages by swinging chimericly separately.In addition, one is welded with rod member 121,122 respectively on each 108B of snap action portion, 109B, and this rod member the 121, the 122nd forms along the inner edge portion bending pole of the engaging recessed part 119,120 that is used to engage interlock control member 107.

And, as shown in figure 13, first connecting elements 109 and second connecting elements 108 (specifically, be weldingly fixed on integratedly on first connecting elements 109 and second connecting elements 108 rod member 121,122) form at body fore-and-aft direction (the paper above-below direction among Figure 13) and go up the state overlapping with the interlock control member 107 that is in neutral position.

As shown in figure 14, on the bottom surface sections 100A of the bottom of described supporting member 100, formed and had move left and right path L1, the left side moves forward and backward the handle bullport 123 that path L2 and right side move forward and backward path L3, bottom surface sections 100A by this supporting member 100 constitutes lever operated guide portion G, wherein, move left and right path L1 is for allowing interlock control member 107 from the path of neutral position to the operation of body left and right directions, the left side moves forward and backward path L2 for allowing interlock control member 107 from the left end position of this move left and right path L1 to the path of body fore-and-aft direction operation, the right side move forward and backward path L3 for allow with interlock control member 107 from the right-hand end position of described move left and right path L1 the path to the operation of body fore-and-aft direction.

But, the moving direction of interlock control member 107 is opposite with the moving direction of gear change hand lever 99, and when to left swing gear change hand lever 99, interlock control member 107 is to right-hand swing, when forwards swinging gear change hand lever 99, interlock control member 107 is rearward swung.

In the attended operation mechanism 101 of said structure, interlock control member 107 is under the state of the right-hand end position that is rocked to move left and right path L1 from neutral position, by operating to the body fore-and-aft direction, first connecting elements 109 is operated by interlock, and, interlock control member 107 is under the state of the left end position that is rocked to move left and right path L1 from neutral position, by operating to the body fore-and-aft direction, interlock is operated second connecting elements 108, operation by first connecting elements 109, the main transformer quick-mounting is put 21 and is switched between third gear and the fallback state advancing, and, by the operation of second connecting elements 108, the main transformer quick-mounting is put 21 and is being advanced second grade and advance and switch between first grade.

In addition, whether switch to the fallback state detecting sensor S that fallback state detects and be used for detecting first connecting elements 109 of attended operation mechanism 101, put 21 and switch to fallback state thereby can detect the main transformer quick-mounting by the main transformer quick-mounting being put 21.

Promptly, as shown in figure 10, has the fallback state detecting sensor S that is the state that is supported on the supporting member 100 in the front side position of first connecting elements 109, when first connecting elements 109 is operated side oscillation forwards, first connecting elements 109 contacts with fallback state detecting sensor S, puts 21 and has switched to fallback state thereby can detect the main transformer quick-mounting by fallback state detecting sensor S.Like this, form the structure that first connecting elements 109 is also used as the detection effect member of fallback state detecting sensor S.

When utilizing this fallback state detecting sensor S to detect to retreat transport condition, so that rising to the mode of maximum lifting position, seedling growing device 5 controls the action of pressure control valve V to oil cylinder 4 as the control device H of the control module that the running of each several part is controlled.In addition, though it is unspecified, but control device H forms following structure, promptly, when in the field, travelling operation, the amount of moving up and down that changes changing based on the ground pressure of center-point earth hull 9 detects, and controls the lifting control of oil cylinder 4 for seedling growing device 5 is maintained setting value with respect to the height of field face.

Attended operation mechanism 101 has: neutral gear force application mechanism 125, it is positioned under the state of move left and right path L1 interlock control member 107 (gear change hand lever 99), in the L1 of move left and right path, under the state of operation interlock control member 107 (gear change hand levers 99), interlock control member 107 (gear change hand lever 99) is pushed the application of force so that it restores to neutral position from the left and right directions both sides overcoming active force by manual operation; Mobile limiting member 124, it switches to active state when restoring to neutral position at interlock control member 107, when the active force that overcomes neutral gear force application mechanism 125 is operated to the left end position of move left and right path L1 or right-hand end position with interlock control member 107, switch to the mode of non-active state, switch linkedly with neutral gear force application mechanism 125.

Then, describe neutral gear force application mechanism 125 in detail.

As Figure 12, Figure 13 and shown in Figure 15, be fixed with the carriage 126 of approximate " コ " font in the outside of vertical wall 100B of portion of supporting member 100 left and right sides, be connected with to pivotal support swing arm 127 on each carriage 126 respectively, this swing arm 127 can freely swing around horizontal axis X 3.One is fixed with butt limiting member 128 in the bottom of each swing arm 127, this butt limiting member 128 is the pole bending to be formed for approximate " コ " word shape to interlock control member 107 side-prominent modes with the fore-and-aft direction outside that extends to supporting member 100 and front and back central portion, stretching to each other in the both sides, front and back of the butt limiting member 128 of the swing arm 127 of the left and right sides is provided with helical spring 129, this helical spring 129 with each butt limiting member 128 to the approaching direction tractive application of force mutually.

Active force by helical spring 129, the butt limiting member 128 of the left and right sides is applied in active force and is being pulled to mutual approaching direction, swing arm 127 is connected to that vertical wall 100B of portion goes up and the swing that surpasses vertical wall 100B of portion is limited, under this state, the butt limiting member 128 of the left and right sides remains on neutral position near being in the interlock control member 107 of neutral position.

In addition, when making interlock control member 107 direction or right move from neutral position,, it is restored towards neutral position left to interlock control member 107 application of forces by the active force of helical spring 129.But the active force of helical spring 129 is set to such an extent that the degree of the power of the gear change hand lever of direction manual operation to the left and right 99 is little than overcoming this active force.

And, swing arm 127 pars intermedia up and down separately in the left and right sides is provided with mobile limiting member 124 with the fixing state of one, be at interlock control member 107 under the state of neutral position, this mobile limiting member 124 passes the inserting hole 130 that is formed on the supporting member 100, embedding is fastened in first connecting elements 109 and the last formed engaging recessed part 119,120 of second connecting elements 108 108B of snap action portion, 109B separately, thereby this mobile limiting member 124 limits first connecting elements 109, second swing of connecting elements 108 on fore-and-aft direction.

Like this, mobile limiting member 124 is arranged on the swing arm 127 with stationary state, thereby the active force that overcomes neutral gear force application mechanism 125 when interlock control member 107 is when being operated to the left end position of move left and right path L1 or right-hand end position, mobile limiting member 124 interlocks are swung in this, thereby the embedding engaging with respect to engaging recessed part 119,120 is disengaged, thereby switches to a non-active state of swinging on fore-and-aft direction that allows the correspondence in first connecting elements 109 and second connecting elements 108.

Thereby, mobile limiting member 124 constitutes as follows and switches with neutral gear force application mechanism 125 interlocks, promptly, when gear change hand lever 99 restores to neutral position, switch to active state, by overcoming the active force operation gear change hand lever 99 of neutral gear force application mechanism 125, when it is operated to the left end position in move left and right path or right-hand end position, switch to non-active state.

Main clutch 72 is that the multi-disc friction type clutch that can freely switch to drive state and blocking state by being operated constitutes, wherein, drive state is meant that the blocking state is meant the state that cuts off transmission of power with the transmission of power of driving shaft 71 state that is positioned at distolateral upstream side first gear 77 of axis direction one to two upstream side gears 77,78 of arranging along axis direction.

If describe in detail, in the main clutch 72, with the driving side member 72a of driving shaft 71 one rotations on have a plurality of driving side friction plate 72b, these a plurality of driving side friction plate 72b can one freely rotate, and can move freely on the axis direction of driving shaft 71.In addition, main clutch 72 has slave end member 72c, this slave end member 72c is entrenched on upstream side first gear 77 by spline, can freely rotate with upstream side first gear 77 one, and can move freely on the axis direction of driving shaft 71, have a plurality of slave end friction plate 72d on this slave end member 72c, these a plurality of slave end friction plate 72d can one freely rotate, and, can on the axis direction of driving shaft 71, move freely.And, above-mentioned driving side friction plate 72b and slave end friction plate 72d are configured to the state of intermeshing, active force by compression spring 131, the slave end member 72c application of force is made it on axis direction, move, carry out crimping by above-mentioned friction plate 72b, 72d thus and switch to drive state.That is to say, be the clutch state by the active force that compresses spring 131 by the application of force.

On the driving side member 72a of main clutch 72, form coniform 72aT that axis with driving shaft 71 is the summit and coniform the 17BT of outside case part 17Ba separates specified gap state in opposite directions at its Outboard Sections.

And, by depressing the operating pedal of operating on the manoeuvre portion 96 that is formed on the body A that travels 132, switch to the clutch separation state, if remove the operation that depresses of operating pedal 132, then switch to the clutch state.

That is to say, as Fig. 6, Fig. 8 and shown in Figure 9, support operation pedal 132 and lateral rotation back shaft 133 that operating pedal 132 can freely rotate is extended along left and right directions be provided with, the pull bar 136 that connects by pivotal support ground connects the swing arm 134 and the clutch operating arm 135 that are had on these rotation support shaft 133 makes swing arm 134 and clutch operating arm 135 interlocks.In addition, clutch operating arm 135 is being supported and can freely rotated by rotation support shaft 150, this rotation support shaft 150 is supported on the inside of gearbox body 17A, and can freely rotate around longitudinal axis, when when depressing operating operation pedal 132 operated clutch motion arms 135 and rotate, the operating parts 151 operation slave end member 72b that had by rotation support shaft 150 move its active force that overcomes compression spring 131 round about, make its separation thereby can operate main clutch 72.

In addition, operating pedal 132 constitutes when removing the entering into of operating pedal 132, and by the active force of return spring 137, to operating pedal 132 application of forces it is restored to original position, by the active force of compression spring 131, main clutch 72 restores and is the clutch state.

Next, describe the main transformer quick-mounting being put the structure that 21 output is passed to front-wheel 1 and trailing wheel 2.

As shown in Figure 4, the power transmission shaft 22 of speed change upstream side is supported on gearbox body 17A via bearing 23 and goes up and can rotate freely, and the power transmission shaft 22 that the main transformer quick-mounting is put 21 speed change output shaft 75 and speed change upstream side is connected by spline structure.

On the power transmission shaft of speed change upstream side, be fixed with low-speed gear 25 and high gear 24, on the power transmission shaft 26 in speed change downstream, be embedded with change-speed gearing 27 outside by spline structure, this change-speed gearing 27 can with the rotation of power transmission shaft 26 one, and can be free to slide.Operation change-speed gearing 27 makes its slip, makes change-speed gearing 27 and low-speed gear 25 and high gear 24 engagements, and the power speed changing of the power transmission shaft 22 of speed change upstream side is passed to the power transmission shaft 26 in speed change downstream for two shelves of height thus.Thus, constituted and the main transformer quick-mounting can have been put 21 the free speed change of output secondary speed-changing device 74 for two shelves of height.

In addition, by the changer lever (not shown) that these secondary speed-changing device 74 operation secondary speed-changing devices are used, can operate switching at a high speed and low speed.

As shown in Figure 4, on left and right sides front truck axle box 20, relatively dispose a pair of power transmission shaft 28, have box of tricks 29 between a pair of power transmission shaft 28, the case 29a of box of tricks 29 is supported on the gearbox body 17A via bearing 33, and the case 29a of box of tricks 29 can rotate freely.On the power transmission shaft 26 in speed change downstream, be fixed with travelling gear 30, be fixed on travelling gear 31 and travelling gear 30 engagements on the case 29a of box of tricks 29.

On the power transmission shaft 28 of a side, be embedded with cylinder element 32 outside by bond structure, this cylinder element 32 can and can be free to slide with the rotation of power transmission shaft 28 one, and, on the power transmission shaft 28 of a side, also have and be used to operate cylinder element 32 and make the operating axis 41 of its slip and the differential locking pedal (diff-lock pedal) (not shown) that is connected with operating axis 41.When depressing operation differential locking pedal, operating operation axle 41 makes its rotation, cylinder element 32 is operated and slides, thereby cylinder element 32 meshes with the end of the case 29a of box of tricks 29, by cylinder element 32 and the end of the case 29a of box of tricks 29 are meshed, can make box of tricks 29 form lockup states.

And the output shaft 34 that travels is formed on the rear portion of gearbox body 17A with rearwardly projecting state, is fixed on bevel gear 35 and bevel gear 36 engagements that are formed on the output shaft 34 that travels on the case 29a of box of tricks 29.As shown in Figure 1, have the back axle case 37 that supports trailing wheel 2, between the power shaft (not shown) of output shaft 34 and back axle case 37 that travels, be connected with power transmission shaft 38.

That is to say, constituted following driving transmission agent, promptly, the power that the main transformer quick-mounting is put 21 speed change output shaft 75 is passed to front-wheel 1 via secondary speed-changing device 74, box of tricks 29, power transmission shaft 28, and the main transformer quick-mounting is put the power of 21 speed change output shaft 75 and is passed to trailing wheel 2 via the case 29a of box of tricks 29, travel output shaft 34 and power transmission shaft 38.

In addition, as shown in Figure 4, in the interior wall portion of gearbox body 17A and travel and have a plurality of friction plates 39 between the output shaft 34, discoid control member 40 outer being embedded on the output shaft 34 that travels, and can rotate freely with respect to the output shaft 34 that travels, be provided with the operating axis 42 that operating operation member 40 slides.

And, the rotation support shaft 133 of operating pedal 132 is connected via not shown link mechanism interlocking with described operating axis 42, when depressing operating operation pedal 132, main clutch 72 is operating as released state, and operating operation axle 42 makes its rotation, and operating operation member 40 makes its slip, thereby control member 40 is pushed friction plate 39, output shaft 34 brakings of travelling.When travelling output shaft 34 brakings, make front-wheel 1 braking by box of tricks 29 and power transmission shaft 28, make trailing wheel 2 brakings by travel output shaft 34 and power transmission shaft 38.

The following describes drive mechanism to 5 transmissions of seedling growing device.

As shown in Figure 4, the travelling gear 43 of upstream side cylindraceous is via one-way clutch 44 outer being embedded on the power transmission shaft 22 of speed change upstream side, by one-way clutch 44, the onward impulse of speed change output shaft 75 is passed to the travelling gear 43 of upstream side, retreats the travelling gear 43 of transmission of power to upstream side.

The travelling gear 45 in downstream and 6 speed change upstream side travelling gears 46 are interconnecting in mode that can the one rotation, the travelling gear 46 that the driven gear 45 in downstream and 6 speed changes are used is being embedded in outward with respect to power transmission shaft 26 free rotation mode in downstream on the power transmission shaft 26 in downstream, and the travelling gear 43 of upstream side and the driven gear in downstream 45 form the state that is engaged and linked.

And, as shown in Figure 5, with the selection power take-off 47 of power transmission shaft 26 configured in parallel in downstream on outside be embedded with 6 speed change downstream travelling gears 48, and 6 speed change downstream travelling gears 48 can be with respect to selecting power take-off 47 to rotate freely, 6 speed change upstream side travelling gears 46 and speed change downstream travelling gear 48 mesh respectively, and have action bars 49, this action bars 49 can freely select in 6 speed change downstream travelling gears 48 one with select power take-off 47 to be connected and remove connection between them.

Constitute driving transmission 50 between strain by 6 speed change upstream side travelling gears 46, speed change downstream travelling gear 48 and action bars 49 etc., select in 6 speed change downstream travelling gears 48 one to be connected by action bars 49 with selecting power take-off 47, thus with speed change output shaft 75 to advance with power speed changing be that 6 shelves are passed to selection power take-off 47.

Top at gearbox body 17A rear portion has output shaft 51, and this output shaft 51 is outstanding backward, can rotate freely the extraterrestrial bevel gear 52 and bevel gear 53 engagements that are fixed on the power transmission shaft 47 that is embedded on the output shaft 51 with respect to output shaft 51.Speed change member 54 is embedded in outward on the output shaft 51 by spline structure and can rotates with output shaft 51 one, and speed change member 54 can be free to slide, have to speed change member 54 towards with the spring 55 of the bevel gear 52 engagement one side application of force, also have the action bars 56 of operation speed change member 54 away from bevel gear 52, thus constitute the power of speed change output shaft 75 freely can be driven to output shaft 51 and cut off this transmission plant clutch 57.As shown in Figure 1, between the power shaft (not shown) of output shaft 51 and seedling growing device 5, be connected power transmission shaft 58.

Thereby, the power of power transmission shaft 26 via driving transmission between strain 50, bevel gear 52,53, plant clutch 57, output shaft 51 and power transmission shaft 58 and be passed to seedling growing device 5.

The following describes the drive mechanism of oil pressure pump 59.

As shown in Figure 3 and Figure 4, on gearbox body 17A, have the driven gear 138 that can rotate freely with relay axis 76 one with counter-rotating, on driving shaft 71, have the driven wheel 139 that meshes with this driven gear 138.In addition, the pump with the state that is the cross side that being positioned at reverses uses relay axis 76 making counter-rotating be connected with gear mechanism 141 via speedup with output shaft 140 with relay axis 76 and pump with output shaft 140.

And, on gearbox body 17A, between the power shaft 59a of pump, dispose pump driving shaft 60 with output shaft 140 and oil pressure pump 59, pump is connected by spline structure via connecting elements cylindraceous 61 with output shaft 140 and pump driving shaft 60, and the power shaft 59a of oil pressure pump 59 is connected via connecting elements 62 cylindraceous with pump driving shaft 60.

Like this, the power of engine 19 is passed to pump driving shaft 60 with gear mechanism 141, pump with output shaft 140 with relay axis 76, speedup via driving shaft 71, counter-rotating, at engine 19 duration of works, drives oil pressure pump 59 always.

As shown in Figure 8, observe from the side of gearbox body 17A, driving shaft 71, speed change output shaft 75, counter-rotating are configured in respectively in the gearbox body 17 with following state with relay axis 76, promptly, driving shaft 71 is than speed change output shaft 75 lower side of side more on the front, driving shaft 71 and speed change output shaft 75 make rotation arrange in the horizontal direction towards body transverse width direction, and counter-rotating is positioned at the top of driving shaft 71 with relay axis 76.

(other embodiments)

(1) in the above-described embodiment, be rocked under the state of left from neutral position at gear change hand lever 99, by this gear change hand lever 99 of operation on fore-and-aft direction, can switch at a high speed with forward operation position (F3) and back operation position (R), but can adopt following structure to replace this structure, promptly, be rocked under right-hand state from neutral position at gear change hand lever 99, by operation gear change hand lever 99 on fore-and-aft direction, can switch at a high speed with forward operation position (F3) and back operation position (R).

(2) in the above-described embodiment, be formed on make on the body fore-and-aft direction first connecting elements 109 and second connecting elements 108 respectively with the structure of the overlapping form of the interlock control member 107 that is in neutral position, but also can be formed on the body fore-and-aft direction all structures of nonoverlapping form of first connecting elements 109 and second connecting elements 108 and the interlock control member 107 that is in neutral position.

(3) in the above-described embodiment, mobile limiting member 124 forms the structure of switching with neutral gear force application mechanism 125 interlocks, but also can be with the structure that mobile limiting member 124 forms and neutral gear force application mechanism 125 irrespectively switches between active state and non-active state, perhaps, can also be structure with so mobile limiting member 124.

(4) in the above-described embodiment, show low-speed forward speed change state and middling speed each structure that constitutes by the gear of shelves of speed change state of advancing, but these each speed change state can respectively have a plurality of gears.

In addition, in the above-described embodiment, show and by manual operation the main transformer quick-mounting is put 21 and carry out the situation of variable speed operation, but also can form based on the operation of gear change hand lever 99 and carry out the structure of variable speed operation by actuator (not shown).

(5) in the above-described embodiment, whether whether fallback state detecting sensor S carries out detection effect by first connecting elements 109 to attended operation mechanism 101 to detect driving transmission 21 and switch to and retreat transport condition, be the detection member that retreats the special use of transport condition but detection also can be set.

(6) in the above-described embodiment, use the actuator of oil hydraulic cylinder 4, but also can use the actuator of electric such as electronic cylinder as 5 liftings of operation seedling growing devices.

(7) in the above-described embodiment, show rice transplanter, but the utility model also can be used in other working in paddy field such as direct sower as working in paddy field.

The utility model is applicable to rice transplanter or the direct such working in paddy field that operation is travelled in the paddy field of sower.

Claims (5)

1. the variable speed operation structure of a working in paddy field, have driving transmission and gear change hand lever, described driving transmission can freely switch to the speed change state that advances at utmost speed respectively with the speed change state of travelling of the body that travels, the middling speed that speed is lower than the described speed change state that the advances at utmost speed speed change state of advancing, speed be lower than described middling speed advance speed change state the low-speed forward speed change state and retreat transport condition, described gear change hand lever instructs to form the described speed change state that advances at utmost speed, the described middling speed speed change state of advancing, described low-speed forward speed change state, the described transport condition that retreats, it is characterized in that

Described driving transmission is made of the gear type speed change gear, this gear type speed change gear constitutes gear ratio under the described speed change state that advances at utmost speed and described middling speed and advances the difference of the gear ratio under the speed change state less than described middling speed the poor of gear ratio under the speed change state and the gear ratio under the described low-speed forward speed change state that advance

Described gear change hand lever is operated and can freely switches to the operating position that advances at utmost speed that is used to switch to the described speed change state that advances at utmost speed respectively, be used to switch to the advance middling speed forward operation position of speed change state of described middling speed, be used to switch to the low-speed forward operating position of described low-speed forward speed change state, be used to switch to the described back operation position that retreats transport condition, and described advance at utmost speed operating position and described back operation position are set at and are being accompanied by along the move operation of body fore-and-aft direction and can carry out under the state of mutual handover operation in opposite directions position.

2. the variable speed operation structure of working in paddy field as claimed in claim 1 is characterized in that,

Described gear change hand lever is supported on the supporting member, and described gear change hand lever can be respectively be operated to be the mode that cross freely swings on body left and right directions and body fore-and-aft direction,

And has the attended operation mechanism that connects described gear change hand lever and described driving transmission, make and be rocked to from neutral position under the state of the either party right-hand and the left at described gear change hand lever, by described gear change hand lever being operated to the either party in the place ahead and the rear, switch to described high speed and use the forward operation position, by being operated to the opposing party in the place ahead and the rear, switch to described back operation position.

3. the variable speed operation structure of working in paddy field as claimed in claim 2 is characterized in that,

Second connecting elements that described attended operation mechanism has first connecting elements that the first variable speed operation member used with variable speed operation is connected and is connected with the second variable speed operation member that variable speed operation is used, and, the interlock control member that can swing with described gear change hand lever one on body left and right directions and body fore-and-aft direction respectively being operated is rocked to from neutral position under the state of the either party right-hand and the left, by the described interlock control member of operation on the body fore-and-aft direction, interlock is operated described first connecting elements, and, be rocked to from described neutral position under the state of the opposing party right-hand and the left at described interlock control member, by the described interlock control member of operation on the body fore-and-aft direction, interlock is operated described second connecting elements

By operation to described first connecting elements, described driving transmission described advance at utmost speed speed change state and described retreat to travel switch between the speed change state, and, by operation to described second connecting elements, described driving transmission advances in described middling speed and switches between speed change state and the described low-speed forward speed change state

Have and to carry out the mobile restriction member that freely switches; When described interlock control member is in described neutral position; Described mobile restriction member forms the active state of described first connecting elements of restriction and the movement of described second connecting elements on the body fore-and-aft direction; When described interlock control member is rocked to right-hand or during left from described neutral position; Described mobile restriction member is removed the restriction of described first connecting elements and described second connecting elements is formed the non-active state that permission moves up in the body front and back

Described first connecting elements and described second connecting elements form respectively on the body fore-and-aft direction and are in the overlapping state of described interlock control member of described neutral position.

4. the variable speed operation structure of working in paddy field as claimed in claim 3 is characterized in that,

Have lever operated guide portion, this lever operated guide portion has: the move left and right path, and its permission is operated described interlock control member from neutral position to the body left and right directions; The left side moves forward and backward the path, and its permission is operated described interlock control member from the left end position in move left and right path to the body fore-and-aft direction; The right side moves forward and backward the path, and its permission is operated described interlock control member from the right-hand end position in described move left and right path to the body fore-and-aft direction;

Has the neutral gear force application mechanism, under described interlock control member is positioned at state on the described move left and right path, operating on the described move left and right path under the state of described interlock control member overcoming active force by manual operation, described interlock control member is pushed the application of force, so that described interlock control member restores from the left and right directions both sides to described neutral position;

Make described neutral gear force application mechanism and described mobile limiting member interlock, switch to described active state when restoring to described neutral position, switch to described non-active state when being operated to the left end position in described move left and right path or right-hand end position when the active force that overcomes described neutral gear force application mechanism and with described interlock control member at described interlock control member.

5. as the variable speed operation structure of claim 3 or 4 described working in paddy field, it is characterized in that,

On the body that travels, be connected with can free lifting apparatus for work,

And the variable speed operation structure of this working in paddy field has: actuator, and it drives described apparatus for work lifting; The fallback state detecting sensor, it detects described driving transmission and whether switches to the described speed change state of travelling that retreats; Control device, when this fallback state detecting sensor detects describedly when retreating transport condition, control device makes described actuator action so that described apparatus for work rises;

Described fallback state detecting sensor constitutes by described first connecting elements to described attended operation mechanism carries out detection effect, detects described driving transmission and whether switches to the described transport condition that retreats.

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