JP2006136288A - Transmission structure of seedling planting apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress increase of components and increase of weight of a seedling-planting apparatus by rationally reducing a torque limiter, in a transmission structure of a seedling planting apparatus constituted so as to transmit power input to a feed case through a laterally-facing output shaft to a planting case and drive a planting mechanism installed in the planting case. <P>SOLUTION: The transmission structure of the seedling planting apparatus is constituted so as to laterally install and support a pair of right and left output shafts 13 in abutting state to a feed case 11 and independently restrict a transmission torque to each output shaft 13 by a pair of torque limiters 37. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a transmission structure of a seedling planting device equipped in a rice transplanter.

As a transmission structure of a seedling planting apparatus, a structure in which power input to a feed case is transmitted to a planting case via a lateral output shaft and a planting mechanism provided in the planting case is driven is often used. In such a transmission structure, in order to prevent the transmission system from being damaged when an overload acts on the planting mechanism, a torque limiter is introduced and the number of planting strips is relatively small (for example, In the 4 seedling planting device, one torque limiter is provided on the traveling machine body side, and in the seedling planting device having a large number of planting strips, for example, as shown in Patent Document 1, for each planting case Equipped with a torque limiter.
JP 2000-270622 A

  The planting case is basically equipped with a planting mechanism for two strips, and is equipped with three planting cases for the 6-row planting specification, 4 for the 8-row planting specification, and 5 for the 10-row planting specification. As many torque limiters are incorporated as the number of planting cases, the number of parts is increased and the weight of the seedling planting apparatus is increased.

  The present invention has been made paying attention to such points, and is intended to suppress an increase in the number of parts and an increase in the weight of the seedling planting device by rationally reducing the torque limiter. .

The first invention is a transmission structure of a seedling planting device configured to transmit power input to a feed case to a planting case via a lateral output shaft and to drive a planting mechanism equipped in the planting case.
A pair of left and right output shafts are horizontally supported in abutment state on the feed case, and a transmission torque to each output shaft is independently limited by a pair of torque limiters.

  According to the above configuration, a pair of torque limiters are provided regardless of the number of planting cases, and the number of strips borne by each torque limiter can be arbitrarily set according to the positional relationship between the feed case and the planting case.

  Therefore, according to the first invention, while the planting load can be distributed to the pair of torque limiters, the number of parts can be increased and the seedling planting device of the planting device can be increased compared to the case where each planting case is equipped with a torque limiter. The increase in weight can be suppressed, which is effective for reducing the weight and cost of the seedling planting device.

According to a second invention, in the first invention,
The planting mechanism is composed of a rotary planting mechanism having planting claws that are rotated at a constant speed by a non-constant speed gear transmission mechanism inside the case at both ends of a rotating case that is driven to rotate at a constant speed, and the rotating case The boss member for fixing the central gear in the inconstant speed gear transmission mechanism to the planting case side is embedded and fixed in the planting case by insert molding.

  According to the said structure, compared with the case where a boss member is bolt-connected to a planting case, a number of parts and the assembly | attachment labor of a boss member can be reduced, and the said effect of 1st invention is promoted.

According to a third invention, in the second invention,
A sealing member is interposed between the rotating case and the boss member, and a cylindrical rib surrounding the sealing member mounting portion with a small interval is provided in the planting case.

  According to the above configuration, the cylindrical rib prevents the weeds and straw from the field from winding around the rotation center due to the rotation of the rotation case, and prevents the seal member from being damaged so that the rotation case is always suitable. Can be operated.

  The side surface of the seedling planting apparatus 1 of the 8-row planting specification equipped in the rear part of the riding rice transplanter is shown by FIG. This seedling planting device 1 is connected to the lower part of the rear end of a lifting link mechanism 2 that is capable of being driven up and down on a traveling machine body on the left side of the figure so as to be able to roll freely, and mounts mat seedlings for eight strips. Seedling stand 3 that is reciprocated laterally at a fixed stroke, 8 sets of rotary planting mechanisms 4 that cut out seedlings from the lower end of this seedling stand 3 and plant them on the rice field T, where the rice field T is planted Are provided with three leveling floats 5 arranged in parallel so as to level the surface.

  The front part of the seedling planting device 1 is equipped with a rectangular tube-like horizontal frame 10, and this horizontal frame 10 is connected to the lower part of the rear end of the elevating link mechanism 2 in a freely rolling manner. As shown in FIG. 2, the feed case 11 is connected to the left and right intermediate portions of the horizontal frame 10, and four planting cases 12 are rearwardly cantilevered at the left and right locations on the center side of the horizontal frame 10 and the left and right ends. And two sets of the planting mechanisms 4 are provided on the left and right sides of the rear portion of each planting case 12.

  The working power taken out from the traveling machine body is transmitted to the feed case 11 via the transmission shaft 7, and the seedling table 3 is laterally driven by the power transmitted to the feed case 11, and at each stroke end. The seedling feed belt 6 provided on the seedling setting table 3 is fed at a constant pitch, and the power taken out from the output shafts 13 placed horizontally on the rear side of the feed case 11 is fed to the front part of each planting case 12. The planting mechanism 4 is driven by a shaft and transmitted in units of two strips.

  FIG. 3 shows the internal structure of the feed case 11. The feed case 11 is provided with an input shaft 14 that receives power from the airframe side and protrudes forward, a laterally intermediate shaft 15 that is linked to the input shaft 14 via bevel gears G1 and G2, and a seedling rest. A transverse feed drive shaft 16 for table transverse feed, a seedling feed drive shaft 17 for driving a seedling feed belt arranged concentrically with the intermediate shaft 15, and the output shaft 13 for driving a planting mechanism are provided. The shaft 15 and the lateral feed drive shaft 16 are interlocked and connected via a gear transmission mechanism 18, and the lateral feed drive shaft 15 and the seedling feed drive shaft 17 are interlocked via gears G3 and G4. 15 and the output shaft 13 are interlocked via a chain 19.

  A screw shaft 20 having a reciprocating spiral groove 21 on the outer periphery is connected to the outer end of the lateral feed drive shaft 16, and a slider 23 engaged with the reciprocating spiral groove 21 is fitted on the screw shaft 20 so as to be slidable laterally. The seedling table 3 is connected to the slider 23 via a connecting member 24. Therefore, when the lateral feed drive shaft 16 rotates in a certain direction, the slider 23 is reciprocated by a constant stroke along the screw shaft 20, and the seedling bed 3 is reciprocated laterally along with this.

  The gear speed change mechanism 18 is for switching and changing the horizontal movement speed of the seedling table. Three drive side gears G5, G6, G7 are loosely fitted to the intermediate shaft 15, and these drive side gears G5, G6 are also fitted. , G7 and three driven gears G8, G9, G10 are fixed to the transverse drive shaft 16 and can be shifted in the axial direction in the keyway 25 formed in the intermediate shaft 15 and swing in the radial direction. A displaceable transmission key 26 and a spring 27 that pushes and urges the transmission key 26 radially outward are incorporated, and the transmission key 26 is shifted to any one of the drive side gears G5, G6, and G7. By selectively engaging from the inner circumference, the laterally driven drive shaft 16 is shifted at a gear ratio of the selected drive side gears G5, G6, G7 and the driven side gears G8, G9, G10 engaged therewith. It is designed to be driven. In this way, by shifting the rotational speed of the lateral feed drive shaft 16 to the rotational speed of the intermediate shaft 15 in three stages, the number of operation of the planting mechanism 4 with respect to the lateral movement stroke of the seedling platform 3, in other words, 1 The number of seedlings taken per horizontal movement stroke is changed so that the horizontal width of one cut can be selected in three stages.

  The rear end portion of the transmission key 26 is engaged and supported by a shift member 29 provided at the inner end portion of the speed change operation shaft 28 inserted through the feed case 11, and pushes and pulls the speed change operation shaft 28 to the left and right. It is configured to shift the transmission key 26 by operating. Further, a detent recess 30 is formed on the inward side of the transmission key 26, and the engagement piece 31 provided at the end of the spring 27 is urged and engaged with any recess 30. The transmission key 26 is stably held at each of the three shift positions.

  A seedling feed shaft 32 having a pair of left and right drive arms 33 is connected to the outer end of the seedling feed drive shaft 17. Each time the seedling platform 3 reaches the lateral movement stroke end, the seedling platform 3 A passive lever of a driving mechanism (not shown) provided on the back part enters and pivots into the rotation trajectory of the driving arm 33 continuously rotating in a fixed direction, whereby the seedling feeding belt 6 is moved by a predetermined amount. It is designed to rotate.

  The output shaft 13 projecting from the left and right of the rear portion of the feed case 11 is composed of an independent rotating shaft whose inner end portion is concentrically butted. The driven sprocket 35 and the intermediate shaft 15 which are loosely fitted to the butting portion. The chain 19 is wound and stretched across the drive sprocket 36 fixed to the shaft. The power transmitted to the driven sprocket 35 is transmitted to the left and right output shafts 13 via the torque limiters 37, respectively.

  The torque limiter 37 employs a claw-engaged type jump clutch structure, and includes a driving claw 38 continuously provided on the left and right of the driven sprocket 35 and a driven side transmission boss 39 slidably mounted on the output shaft 13 by a spline. When the driven claw 40 is engaged and disengaged from the axial direction, the power transmission from the driven sprocket 35 to the output shaft 13 is interrupted. The driven-side transmission boss 39 is slidably biased toward the engagement side by the spring 41 and is normally maintained in a power transmission state in which the driving claw 38 and the driven claw 40 are engaged with each other. When the torque exceeds the set value, the driven transmission boss 39 is slid backward against the spring 41 by the cam action on the occlusal slope of the drive claw 38 and the driven claw 40, and the power transmission is cut off.

  As shown in FIG. 4, the input shaft 42 is horizontally supported at the base of the planting case 12, and the input shaft 42 and the output shaft 13 of each planting case 12 are sequentially interlocked and connected via the transmission shaft 43. The left and right torque limiters 37 limit the load torque acting on the two planting cases 12, respectively.

  A planting drive shaft 44 that drives the left and right planting mechanisms 4 is passed through the rear of each planting case 12, and a sprocket 45 that is loosely fitted to the planting drive shaft 44 and a sprocket 46 that is fixed to the input shaft 42. The chain 47 is wound and stretched, and a saddle clutch 48 is interposed between the driven sprocket 45 and the planting drive shaft 44.

  The saddle clutch 48 stops the planting drive shaft 44 of each planting case 12 separately to stop the planting mechanism 4 in units of two strips, so that a small number of strips such as six strips, four strips, two strips, etc. A boss portion 45a is formed by engaging and disengaging a clutch member 49 slidably mounted on the planting drive shaft 44 from the axial direction with respect to an end portion of the boss portion 45a of the sprocket 45. The clutch member 49 is slidably biased in the occlusion direction by a spring 50 and held in a “clutch engaged” state.

  A climbing cam 51 is provided on the side surface of the clutch member 49, and when the operation pin 52 penetratingly attached to the planting case 12 is caused to enter the turning locus of the climbing cam 51 rotating at the clutch engagement position. The clutch member 49 is forcibly shifted in the clutch disengagement direction against the spring 50 by the cam action due to the relative rotation of the position fixing operation pin 52 and the climbing cam 51, and the planting drive shaft 44 is stopped at a predetermined rotational phase. It has become so.

  As shown in FIG. 5, the planting mechanism 4 has a rotating case 55 that is key-connected to the end of the planting drive shaft 44, and can rotate about the horizontal axis on the lateral sides of both ends of the rotating case 55. And a planting claw 57 and a seedling pusher 58 attached to each claw case 56, and the rotating case 55 is moved forward by the planting drive shaft 44 (in FIG. When the claw case 56 rotates one revolution at an unequal speed in the reverse direction in conjunction with one rotation at a constant speed in the clockwise direction, the tip of the planting claw 57 is connected to the lower end outlet of the seedling platform 3. The vertical rotation trajectory S over the surface T is drawn and circulated, and when the planting claw 57 brings the seedling cut out from the lower end of the seedling table into the surface T, the seedling pushing tool 58 protrudes toward the toe side. Planting cut seedlings Is configured to push useless in the ground separately from the pawl 57 will be described its detailed configuration and operation below.

  A claw support shaft 60 having a claw case 56 connected to a flange is rotatably supported at both ends of the rotation case 55, and the claw support shaft 60 is set in the revolving direction in conjunction with the revolution of the rotation case 55 inside the rotation case 55. An inconstant speed gear transmission mechanism 61 that rotates at an inconstant speed in the reverse direction is incorporated. The inconstant speed gear transmission mechanism 61 includes a center gear G11 provided at the center of the rotating case 55, an intermediate gear G12 loosely fitted to the intermediate support shaft 62, and a final gear G13 fixed to each claw support shaft 60. The center gear G11 is loosely supported by the planting drive shaft 44 and is engaged with the end of the boss member 63 fixedly disposed on the shaft support portion of the planting drive 44. The rotation of the gear G11 is blocked.

  Here, all the gears G11 to G13 incorporated in the rotating case 55 are composed of non-circular gears having the same number of teeth, and when the rotating case 55 is rotated at a constant speed in the forward rotation direction, the inconstant speed gears. The transmission mechanism 61 rotates the claw support shaft 60 in a direction opposite to the rotation direction of the rotating case 55 with a predetermined inconstant speed characteristic. As described above, when the rotating case 55 is rotated once at a constant speed in the forward rotation direction, the claw case 46 is rotated once at an unequal speed in the opposite direction and is provided at both ends of the rotating case 45. The pair of planting claws 57 are circulated and rotated with a vertically long trajectory S so that planting is performed twice.

  Here, the boss member 63 that prevents the rotation of the center gear G11 in the inconstant speed gear transmission mechanism 61 is embedded and fixed in the planting case 12 by insert molding. Further, a seal member 64 slidably in contact with the outer periphery of the boss member 63 is fitted into the rotation center portion of the rotation case 55 to prevent the infiltration of muddy water into the rotation case 55 and the planting case 12. On the outer side surface, a cylindrical rib 65 is provided so as to surround the seal portion into which the seal member 64 is fitted and attached at a small interval, and straw scraps and weeds mixed in the field are wound around the seal portion to Damage is prevented.

  [Other Examples]

  (1) In the above-described embodiment, since the upper case specification is provided with two planting cases 12 on the left and right sides of the feed case 11, each of the left and right torque limiters 37 has a planting load of four. However, depending on the position of the feed case 11, the load can be shared by the distribution of (Article 2: Article 6) or (Article 3: Article 5). -Various combinations of load sharing can be set according to the position of the load 11.

  For example, in the case of a 10-row planting specification, the number of divisions of the left and right torque limiters 37 is either (5: 5), (6: 4), or (7: 3). In the case of planting specifications, the number of divisions of the left and right torque limiters 37 is either (5: 4), (6: 3), or (7: 2). In the case of 6-row planting specification, the number of sharing lines of the left and right torque limiters 37 is set to either (5: 2) or (4: 3). (Article 4: Article 2), (Article 3: Article 3), and in the case of five-planting specification, the number of articles assigned to the left and right torque limiters 37 shall be (Article 3: Article 2). Can do.

  (2) A crank type can be used as the planting mechanism 4.

  (3) As the torque limiter 37 for limiting the transmission torque of the left and right output shafts 13, a ball-type jump clutch structure in which a transmission ball is interposed between the driving side clutch member and the driven side clutch member can be used.

Side view of seedling planting device Plan view showing the transmission structure of the seedling planting device Feed case longitudinal rear view Transverse plan view of planting case Transverse plan view of planting mechanism

Explanation of symbols

4 Planting Mechanism 11 Feed Case 12 Planting Case 13 Output Shaft 37 Torque Limiter 55 Rotating Case 57 Planting Claw 61 Inconstant Speed Gear Transmission Mechanism 63 Boss Member 64 Seal Member 65 Cylindrical Rib

Claims (3)

In the transmission structure of the seedling planting device configured to transmit the power input to the feed case to the planting case via the lateral output shaft and drive the planting mechanism equipped in the planting case,
A seedling planting apparatus, wherein the pair of left and right output shafts are horizontally supported in abutting state on the feed case, and the transmission torque to each output shaft is independently limited by a pair of torque limiters. Power transmission structure.   The planting mechanism is composed of a rotary planting mechanism having planting claws that are rotated at a constant speed by a non-constant speed gear transmission mechanism inside the case at both ends of a rotating case that is driven to rotate at a constant speed, and the rotating case The transmission structure of the seedling planting apparatus according to claim 1, wherein a boss member for fixing the central gear in the inconstant speed gear transmission mechanism to the planting case side is embedded and fixed in the planting case by insert molding.   The transmission of the seedling planting apparatus according to claim 2, wherein a sealing member is interposed between the rotating case and the boss member, and a cylindrical rib surrounding the sealing member mounting portion with a small interval is provided in the planting case. Construction.

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