JP2602229Y2 - Rolling control device for working unit in work vehicle - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rolling control device for a working unit in a work vehicle such as a riding rice transplanter.

[0002]

2. Description of the Related Art
In this type of working vehicle, a working unit connected via a lifting link mechanism and a holder member is supported in a freely rotatable manner, and the working unit is elastically held by a rolling elastic machine so that the working unit can be freely positioned. There is one that performs so-called free rolling control that allows a maintenance operation. However, in this case, since the amount of rolling that can be controlled is limited, there is a disadvantage that the working unit is greatly inclined following the rolling of the traveling machine body in a field with large unevenness. Therefore,
Each relatively rolling freely intermediate member relative to the holder member and the working unit is provided, while interposed the rolling bullet machine between the intermediate member and the working part, between the intermediate member and the holder member It has been proposed to perform a complex rolling control by interposing a so-called forced rolling control mechanism that forcibly controls the rolling (horizontal control or tilt control) of the intermediate member based on the motor drive. In other words, since the intermediate member serving as the reference point of the rolling machine is horizontally controlled (inclination control in the case of ridge running), free rolling control can always be enabled regardless of the rolling of the traveling body. In the case of using an electric cylinder having a complicated structure, an increase in the number of parts and an increase in weight become problems. For this reason, it has been proposed to form a forced rolling control mechanism using a so-called rack and pinion mechanism having a simple structure. In this configuration, the rack and the pinion are mutually moved in the tooth width direction based on the play of the rolling fulcrum. Displacement, there is a possibility that the meshing may be disengaged based on the displacement, or it is necessary to arrange the pinion so that it meshes with the middle position of the rack in a horizontal state, so there is a disadvantage that the arrangement of the motor is restricted. Atsuta.

[0003]

SUMMARY OF THE INVENTION The present invention has been conceived in view of the above-mentioned circumstances, and has as its object to provide a rolling control device for a working unit in a working vehicle that can eliminate these drawbacks. der connexion, a holder member coupled to the traveling machine body, the working vehicle comprising connecting the working unit through the rolling shaft, freely respectively relative rolling to the holder member and the working unit Providing an intermediate member, between the intermediate member and the holder member, for sensor detection for detecting the ground posture of the intermediate member.
Of intermediate member to holder member by motor drive control based on
While the forced rolling control mechanism for forcibly controlling rolling is interposed, the working unit is interposed between the intermediate member and the working unit.
For the intermediate member where the forcible rolling control is performed
While interposed rolling bullet machine for driven to rolling control Te, the forcible rolling control mechanism, as well as constructed using Ratsukupinion mechanism for forcibly moving the rack-and-pinion in rotation of the pinion gear with the motor drive, the pinion gear, It is characterized in that it is configured to mesh with the rack via an intermediate gear having a wider tooth width than the rack. The present invention eliminates the inconvenience of disengagement between the rack and the pinion gear by this configuration,
The motor can be freely arranged.

[0004]

Next, an embodiment of the present invention will be described with reference to the drawings. In the drawings, reference numeral 1 denotes a traveling machine of a riding type rice transplanter, and a planting work section 3 is connected to a rear portion of the traveling machine 1 via an elevating link mechanism 2 that operates to raise and lower hydraulic pressure. The planting work section 3 is a holder frame 4 which is detachably connected to a rear end of the elevating link mechanism 2 and which is integrally provided with a boss 4a which is directed to the front and rear at a lower end, and a boss of the holder frame 4. A rolling support shaft 5 rotatably supported by the portion 4a via a pair of front and rear bearings 5a; a rolling support shaft 5 integrally connected to rear ends of the rolling support shaft 5; A working part frame 6 on which the working part frame 6a is erected, a planter case 7 integrally fixed to the working part frame 6, a planter arm 8 juxtaposed to the planter case 7, and an upper end of the seedling table support stay 6a A seedling mounting table 9 which is supported on the upper part of the unit and the planter case 7 via a slide piece S so as to be able to reciprocate left and right, and which is forcibly fed laterally in accordance with the scraping timing of the planter arm 8;
Center and side floats 1 provided at the center of the bottom of the planter case 7 and at both left and right sides so as to be vertically swingable.
0, 11 and so on. That is, the planting work unit 3
The holder frame 4 connected to the traveling body 1 via the lifting link mechanism 2 is supported by a rolling support shaft 5 so as to be freely rotatable. All of the above basic configurations are the same as those of the related art.

[0005] 12 Of the present invention shall apply an intermediate frame which is interposed between the holder frame 4 and planting operations unit 3
Corresponding to between members, but the boss portion 12a is integrally formed at the lower end of the intermediate frame 12 is rotatably fitted supported on the boss portion 4a of the holder frame 4. That is, the intermediate frame 4 includes the holder frame 4 and the planting operation section 3.
, Respectively , and the rolling fulcrum coincides with the rolling fulcrum of the planting work section 3. The intermediate frame 4 includes a frame body 12b in an upright posture and a T-shaped frame portion 12c that projects forward from the upper end of the frame body 12b along the back surface of the seedling mounting table 9, In a side view, it is arranged between the seedling support stand 6 a and the seedling mounting 9.

Further, reference numerals 14 and 15 denote rolling ammunitions each composed of a pair of left and right coil ammunitions.
One of the rolling missiles 14 and 15 is mounted on the frame main body 12 of the intermediate frame 12.
b and the working part frame 6 are interposed in a C-shape to balance the weight of the planting working part 3.
A c-shape is interposed between c and both ends of the seedling mounting table 9 so as to balance the eccentric load accompanying the lateral feeding of the seedling mounting table 9.

Further, reference numeral 16 denotes the holder frame 4.
And a pinion gear 16a for outputting a driving force of the motor 16 is engaged with an intermediate gear 18 rotatably provided on the bracket 17 via a bracket 17 provided at a side position of the bracket 17 via a bracket 17. However, the intermediate gear 18 has a wider tooth width than a rack 19 described later.

On the other hand, the rack 19 includes the intermediate frame 1
2 is provided so as to protrude laterally, but is formed in an arc shape around a rolling fulcrum of the intermediate frame 12, and the intermediate gear 18 meshes with an outer peripheral side edge in a circumscribed manner. A gear portion 19a is formed. That is, when the intermediate gear 19 rotates with the driving of the motor 16, the intermediate frame 12 is forcibly rolled based on the left and right movement of the rack 19 meshing with the intermediate gear 19. Since the gear 18 is in mesh with the gear 19a formed on the outer peripheral side of the curved rack 19 in a circumscribed manner, the backlash in the mesh between the intermediate gear 18 and the rack 19 is in mesh with the rack 19 in an inscribed manner. Is set smaller than. In addition, 20
Disposed on the rear surface of the intermediate frame 12, intermediate frame 2
This is a tilt sensor for detecting the zero attitude to the ground , and forcibly controls rolling (horizontal control or tilt control) of the intermediate frame 12 by motor drive control based on the detection of the tilt sensor 20.

Reference numeral 21 denotes a regulating pin projecting rearward from the intermediate frame 12.
Is a plate 2 provided integrally with the planter case 7.
The second recess 22a is loosely fitted. And the regulation pin 21
If the rolling of the planting operation unit 3 with respect to the intermediate frame 12 is within a predetermined angle, the planting operation unit 3 moves to the left and right within the recess 22a to allow the rolling of the planting operation unit 3, but the planting operation unit 3 with respect to the intermediate frame 12 When the rolling of the plant 3 reaches a predetermined angle, the rolling comes into contact with the left and right ends of the concave portion 22a to further restrict the rolling of the planting work unit 3. That is, the rolling regulation mechanism of the planting work unit 3 is not set between the holder frame 4 and the planting work unit 3,
Intermediate frame 1 in which rolling bullets 14, 15 are interposed
2 and the planting work section 3.

Reference numeral 23 denotes a bracket projecting downward from the T-shaped frame 12c of the intermediate frame 12, and the lower end of the bracket 23 is provided on the front of a guide plate 24 provided on the upper end of the holder frame 4. It is slidably contacted. In other words, a tilting control mechanism is provided which controls the rearward tilting of the intermediate frame 12 receiving the urging force of the rolling bullet 15 based on the contact of the bracket 23 with the guide plate 24. Then, the contact position of the bracket 23 is
5, the contact force of the bracket 23 can be prevented from increasing on the basis of the so-called leverage principle. .

Further, a pair of left and right cylindrical members 23a is protruded from the contact surface of the bracket 23, and a part of each of the cylindrical members 23a is exposed from the distal end of the cylindrical member 23a. The ball 25 which is rotatably abutted is accommodated. That is, the sliding resistance between the bracket 23 and the guide plate 24 accompanying the rolling of the intermediate frame 12 can be minimized.

By the way, at both left and right end portions of the guide plate 24, bent pieces 24a are formed for restricting the range of movement of the bracket 23 in the left and right direction, so that the amount of rolling of the intermediate frame 12 with respect to the holder frame 4 is restricted. As shown in the figure, the left and right bent pieces 24a are respectively provided with limit switches 26 which detect and operate based on contact with the bracket 23. That is, each limit switch 26 is provided to detect the rolling limit position of the intermediate frame 12 and stop driving the motor 16, and the detection position of the limit switch 26 is set to be as far as possible from the rolling fulcrum ( (A position above the rolling fulcrum at a distance L), so that a highly accurate limit detection can be performed at a position where the swing width of the intermediate frame 12 is large, and a detection error based on a mounting error of the limit switch 26 is minimized. It can be made smaller.

Reference numeral 27 denotes a locking pin provided on the holder frame 4, and the locking pin 27 is supported by a bracket 28 provided on a side portion of the holder frame 4 and having a substantially O-shape in side view so as to be slidable back and forth. However, the rolling operation of the intermediate frame 12 is performed by performing a fitting operation (backward sliding operation) into a lock hole 29a formed in a bullet bracket 29 (for connecting the rolling bullet machine 14) of the intermediate frame 12. Can be locked in a horizontal position.

Further, reference numeral 30 denotes a boss member which is externally and integrally fitted to an intermediate portion of the lock pin 27,
A bolt shaft 30a protruding upward from the boss member 30 includes:
The bracket 28 penetrates a long hole 28 a formed to face the front and rear of the bracket 28, and is screwed to the nut 31. When the nut 31 is loosened, the bolt shaft 30a
Moves along the long hole 28a to allow the sliding operation of the locking pin 27. On the other hand, when the nut 31 is tightened, the movement of the bolt shaft 30a is restricted and the locking pin 27 can be fixed at an appropriate position. Since the tightening force of the nut 31 acts only in the vertical direction, it is possible to avoid the inconvenience that the horizontal locking position of the intermediate frame 12 is changed left and right based on the displacement of the locking pin 27 due to the tightening of the nut 31.

In the embodiment of the present invention configured as described above, the holder frame 12 and the planting work section 3 are
Relatively rolling freely intermediate frame 12 respectively, between the intermediate frame 12 and the planting operations unit 3 interposed rolling bullet machine 14, 15 which is driven to roll controls the planting working unit 3 On the other hand, a complex rolling control is performed between the intermediate frame 12 and the holder frame 4 by interposing a forced rolling control mechanism constituted by a motor 16 using a rack and pinion mechanism. The pinion gear 16 a meshes with the rack 19 via an intermediate gear 18 having a wider tooth width than the rack 19. That is, even if the rack 19 shifts back and forth based on the play of the rolling fulcrum, there is no fear that the engagement with the rack 19 will be disengaged, and the engagement width with the rack 19 can be maintained constant. Therefore, it is not possible to improve the reliability by eliminating the inconvenience that the engagement with the rack 19 is disengaged and the control becomes uncontrollable, and an unreasonable load is applied to the motor 16 based on the change of the engagement width. The inconvenience of the operation can be eliminated, and the stability of the rolling control can be improved.

In addition, since the meshing position of the pinion gear 16a with the intermediate gear 18 can be set freely, the motor 1
6 can be flexibly arranged, which can greatly contribute to downsizing of the entire planting work section 3 and the like.

Further, since the reduction ratio and the engagement length can be freely selected based on the setting of the number of teeth and the diameter of the intermediate gear 18, the forced rolling is performed at an optimum speed without particularly controlling the motor speed. As long as the control can be performed, a long engagement length with the rack 19 can be ensured to reliably prevent a decrease in control accuracy due to tooth skipping or the like.

[0018]

In summary, since the present invention is constructed as described above, an intermediate member which can be rolled relatively to the holder member and the working part is provided, and the intermediate member and the working part are provided between the intermediate member and the working part. In addition, a rolling ammunition that performs passive rolling control is interposed, and a forced rolling control mechanism that uses a rack and pinion mechanism is interposed between the intermediate member and the holder member. Working part is medium
Forced rolling control of the spacer between holders
And a free rolling system driven by this intermediate member
To receive complex rolling control with
Till the unevenness of the tillage becomes severe
This improves the accuracy of rolling control in uncultivated fields. And mo
Forcible rolling control by motor drive control
This is not a working part but an intermediate member.
Of intermediate members subject to forced rolling control
As a result of dynamic and free rolling control,
Free-rolling control of the part effectively enforces alive
High-precision rolling control
It is done. Moreover, a pinion gear constituting the rack and pinion mechanism provided for performing the forcible rolling control is meshed with the rack via an intermediate gear having a wider tooth width than the rack. Therefore, even if the rack and the pinion gear are displaced in the tooth width direction based on the play of the rolling fulcrum or the like, the meshing width with the rack is maintained at a constant level, as long as there is no fear that the meshing with the rack may come off. As a result, no unreasonable load (bending moment or the like) is applied to the motor side, and as a result, reliability and stability can be significantly improved.

In addition, the pinion gear can be disposed at a position other than the rack intermediate portion through the intermediate gear, so that the motor can be freely disposed to make the entire working section compact and the like. Can be.

[Brief description of the drawings]

FIG. 1 is a side view of a riding type rice transplanter.

FIG. 2 is a side view of a planting work section.

FIG. 3 is a front view of a main part of the same.

FIG. 4 is an enlarged side view of a main part of the above.

FIG. 5 is an enlarged front view of a main part of the above.

FIG. 6 is an enlarged plan view of a main part of the above.

FIG. 7 is an exploded perspective view of the same.

FIG. 8 is a front view of the intermediate frame locking mechanism.

FIG. 9 is a plan view of the same.

FIG. 10 is a side view of the same.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Traveling body 2 Elevating link mechanism 3 Planting work part 4 Holder frame 5 Rolling spindle 6 Working part frame 6a Seedling table support stay 12 Intermediate frame 14 Rolling elastic machine 15 Rolling elastic machine 16 Motor 16a Pinion gear 18 Intermediate gear 19 Rack 21 Control pin 23 Bracket 24 Guide plate 25 Ball

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-5-252806 (JP, A) JP-A-4-311305 (JP, A) JP-A-2-39608 (JP, U) JP-A-62 16217 (JP, U) Japanese Utility Model Showa 58-115916 (JP, U) Japanese Utility Model Showa 58-121514 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) A01C 11/02 320 A01B 63/10

Claims (1)

(57) [Scope of request for utility model registration] 1. A holder member connected to a traveling body side,
In working vehicle formed by connecting the working unit through the rolling shaft, its relative to the holder member and the working unit
An intermediate member which can be relatively rolled is provided, and a ground position of the intermediate member is detected between the intermediate member and the holder member.
Motor drive control based on sensor detection
While interposed forced rolling control mechanism for forcibly rolling control between member relative to the holder member, between the intermediate member and the working unit, the forcible rolling controls the working unit
Configuration while interposed rolling bullet machine for driven to rolling control, the forcible rolling control mechanism, using a Ratsukupinion mechanism for forcibly moving the rack-and-pinion in rotation of the pinion gear with the motor driving the intermediate member is made A rolling control device for a working section in a working vehicle, wherein the pinion gear is meshed with the rack via an intermediate gear having a wider tooth width than the rack.