JP4629974B2 - Passenger rice transplanter - Google Patents

Description

  The present invention relates to a riding rice transplanter.

Conventionally, as a form of riding rice transplanter, there is one in which a planting part is connected to a rear position of a traveling part so as to be movable up and down, and an arm body is attached to a front end part of the traveling part.
The arm body can be rotated between a use position that protrudes forward and a non-use position that rises upward, for example, when the machine body is moved over the shore so as to escape from the field. In addition, the operator can get off the airframe and move up to the heel, and can also prevent the front part of the airframe from being lifted by rotating the arm body to the use position and pressing the arm body downward. It was like that.
Techniques related to this are disclosed in Patent Documents 1 and 2, for example.
JP 2000-135009 Japanese Patent Laid-Open No. 2000-127983

  However, in the riding rice transplanter as described above, it is possible to prevent the front part of the machine body from being lifted by pressing the arm body downward. When trying to pull up the front part of the machine body through the body, the arm body turns upward, making it difficult to pull up through the arm body.

  Further, some conventional rice transplanters have a mechanism for locking the steering wheel. However, when an excessive load is applied to the steering wheel, it is difficult to avoid troubles such as damage to the steering gear.

Therefore, the present invention provides an arm body that smoothly releases the lock of the steering wheel when an excessive load is applied to the steering wheel, prevents failure such as damage to the steering gear, and improves safety and work efficiency. It is an object to provide a riding rice transplanter including an auxiliary operation lever .

The riding rice transplanter of the present invention connects the planting part to the rear of the traveling part so that it can be moved up and down, and provides left and right arm bodies at the front end of the traveling part, and lifts the front part of the traveling part through the arm body. In the riding rice transplanter that can be prevented, a flat portion is provided at the front portion of the steering operation system member in the steering mechanism between the steering spindle and the front axle case, and at the rear portion of the steering lock body connected to the member, the member is provided. A locking body flat surface portion that abuts against the flat surface portion and is biased toward the member, and a pivot shaft that pivotally supports the base end portion of the left and right arm bodies about an axis in the vertical direction has a front The left and right lock link members are pivotally supported in the middle of each of the left and right lock link members connected by an elastic body, and via a connecting groove formed at the rear of one of the lock link members. Connecting the rear together with the upper and lower polymerized state, further the front end portion of one of the lock link member, the proximal end portion of the auxiliary operating lever for actuating the steering lock mechanism for locking the steering consecutively provided, the auxiliary operating lever The lock link member can be rotated around the pivot by the rotation operation of the auxiliary link, and the lock link member is rotated by the differential operation of the auxiliary operation lever or the storage position of the arm body. The steering lock body biased toward the steering operation system member by the elastic body is locked and released.

  Further, the elastic body may be installed via a restoring force adjusting tool.

According to the present invention, the front portion of the steering operation system member is provided with the flat portion, and the rear portion of the steering lock body connected to the steering operation system member abuts against the flat portion of the member and is biased toward the member. The lock body flat portion is provided to restrict the handle. Therefore, when an excessive load is applied to the steering wheel, the biased steering lock body is pushed back and the steering lock is released, so that a failure such as breakage of the steering gear is prevented. Also, the pivot pivotally supporting the base end portion of the left and right arm members pivotally in the vertical direction of the axis around and pivotally respective intermediate portions of the left and right lock link member connected to the front by an elastic member in a coaxial In addition, the rear portions of the left and right lock link members are connected in a vertically superposed state via a connecting groove formed at the rear portion of one lock link member, and the steering end is locked to the front end portion of one lock link member. A base end portion of an auxiliary operation lever that operates the steering lock mechanism of the auxiliary operation lever is connected, and the lock link member can be rotated about the pivot by rotating the auxiliary operation lever. Alternatively, the steering link is biased toward the steering operation system member by the elastic body by the rotation of the lock link member accompanying the rotation of the arm body to the storage position. Since the body is locked and released, it is possible to improve the safety and work efficiency.

  Since the elastic body that connects the left and right lock link members is installed via a restoring force adjusting tool, the load for restricting the handle can be set and changed as appropriate according to the field conditions.

Embodiments of the present invention will be described below with reference to the drawings.
A shown in FIG. 1 is a riding rice transplanter according to the present invention, and the riding rice transplanter A is connected to a rear position of the traveling unit 1 through a lifting mechanism 3 so that the planting unit 2 can be moved up and down. .

  As shown in FIG. 1, the traveling unit 1 is provided with a motor unit 5 at the front and a driving unit 6 at a rear position of the motor unit 5 on the machine frame 4, while at the front and rear at a position below the machine frame 4. A transmission case 7 extending in the direction and interlockingly connected to the engine E of the prime mover part 5 is arranged, and a pair of left and right front wheels 8 and 8 are interlockingly connected to the front part of the transmission case 7 via front axle cases 21 and 21. In addition, a pair of left and right rear wheels 9, 9 are linked to the rear portion of the transmission case 7. 57 is a reserve seedling stand.

  As shown in FIGS. 1 and 2, the body frame 4 includes a pair of left and right front and rear extension frame forming pieces 10 and 10 extending in the front and rear direction, and a transmission case 7 from the rear end of each front and rear extension frame forming piece 10 and 10. Inclined frame forming pieces 11 and 11 extending in an inclined manner toward the left and right rear parts of the left and right, and left and right extending frame forming pieces 12 horizontally mounted between upper end portions of both inclined frame forming pieces 11 and 11, The rear portions 10a and 10a of the front and rear extension frame forming pieces 10 and 10 are extended rearward and upward to form an inclined shape.

  As shown in FIG. 1, the driving unit 6 is provided with a steering column 13 immediately after the prime mover unit 5, a steering support shaft 14 is erected from the steering column 13, and a steering is provided at the upper end of the steering support shaft 14. A wheel 15 is attached, and a seat 16 is disposed behind the steering wheel 15.

  At the left side position of the steering column 13, a shift lever 17 for performing a shift operation of the traveling unit 1 and a clutch / brake lever 18 that can perform a clutch operation and a brake operation from the outside of the airframe are respectively front and rear. On the right side of the seat 16, a planting lift lever 19 and a differential lock lever 20 for lifting and lowering the planting part 2 are provided so as to be swingable in the front-rear direction. ing.

Further, as shown in FIG. 2, a steering mechanism 22 is interposed between the lower end portion of the steering support shaft 14 and the front end portions of the front axle cases 21 and 21.
That is, the steering mechanism 22 includes a steering operation arm that is a steering operation system member on a support frame 23 that is interposed between the front part of the pair of left and right front and rear extension frame forming pieces 10 and 10 and the front end part of the transmission case 7. A midway part 24 is pivotally supported by an arm pivot 25 whose axis is directed in the vertical direction, and an arcuate internal gear 26 centering on the arm support shaft 25 is provided at the rear part of the steering operation arm 24. A small gear 27 attached to the lower end portion of the steering support shaft 14 is meshed with the internal gear 26.
A pair of left and right tie rods 29 and 29 are interposed between the left and right sides of the front end of the steering operation arm 24 and the knuckle arms 28 and 28 provided at the front end portions of the front axle cases 21 and 21, respectively.

  In this manner, in the steering mechanism 22, the steering operation arm 24 is rotated about the arm support shaft 25 in conjunction with the rotation operation of the steering wheel 15, and the pair of left and right tie rods are interlocked with the steering operation arm 24. 29 and 29 are pushed and pulled, and the front end portions of the front axle cases 21 and 21 are rotated via the knuckle arms 28 and 28 so that the steering operation of the pair of left and right front wheels 8 and 8 is performed.

  As shown in FIG. 3, the transmission case 7 is provided with a pair of left and right front wheel drive shafts 30 and 30 with the axis lined in the left and right direction at the front, and a differential between the inner end portions of the two front wheel drive shafts 30 and 30. A differential lock mechanism 32 is disposed in the vicinity of the differential mechanism 31 through the mechanism 31, and the lower end 33a of the operation shaft 33 provided in the differential lock mechanism 32 protrudes downward from the transmission case 7, and the lower end As shown in FIG. 4, the middle part of the interlocking lever 44 extending in the left-right direction is connected to 33a, and a differential lock lever provided in the operating part 6 via an interlocking wire 45 at one end of the interlocking lever 44 20 are linked together.

As shown in FIG. 1, the planting unit 2 arranges a seedling stage 36 on a planting mission case 35, and places a seedling mat (not shown) on the seedling stage 36. The mat is cut into a seedling block by a planting claw 37 interlocked with the planting mission case 35, and the seedling block is planted in the field. 38 is a float.
An input shaft 39 protrudes forward from the planting mission case 35, and the input shaft 39 and the PTO shaft 40 provided in the above-described mission case 7 are linked and connected via a transmission shaft 41.

  As shown in FIG. 1, the elevating mechanism 3 includes a top link 42, a pair of left and right lower links 43, 43, and an elevating cylinder (not shown) that moves the links 42, 43, 43 up and down. Thus, the planting unit 2 can be moved up and down at the rear position of the traveling unit 1 by extending and retracting the lifting cylinder.

  A pair of left and right arm bodies 50, 50 are provided at the front end portion of the traveling portion 1, and each arm body 50, 50 is attached to the front end portion of the traveling portion 1 so that the base end portion is pivotable in the vertical direction about the axis. As shown in FIG. 8, the use position (A) in which the tip portions of both arm bodies 50, 50 are spaced apart from the front of the running portion 1 and the tip portions of both arm bodies 50, 50 are placed on the running portion 1. The position can be freely changed to a storage position (b) arranged close to each other.

That is, as shown in FIG. 5, an attachment body 51 is attached to the front portion of the support frame body 23, and an arm formed in a rod shape via a pair of left and right pivots 52, 52 with the axis line directed vertically in the attachment body 51 The base end of the body 50, 50 is pivoted.
As shown in FIGS. 6 to 8, each arm body 50, 50 includes a front extension piece 53, 53 extending forward from a pivot 52, 52 disposed below the front part of the body frame 4, and each front extension Upwardly rising pieces 54 and 54 formed by rising upward from the tip portions of the pieces 53 and 53, and outwardly extending pieces 55 and 55 formed by extending outwardly from the tip portions of the upper rising pieces 54 and 54, respectively. And gripping pieces 56, 56 formed by extending forward from the front end portions of the respective outwardly extending pieces 55, 55.

  In this way, as shown in FIG. 8 (a), the gripping pieces 56, 56 of the arm bodies 50, 50 are arranged above the machine body frame 4, and both the gripping pieces 56, 56 are placed on the traveling unit 1. At the use position (a), which is spaced apart from the front, a fixed interval W in the left-right width direction is formed between the gripping pieces 56, 56, and the operator stands up within the same interval W and both grips. The arms 56 and 50 can be operated by grasping the pieces 56 and 56.

  Further, each arm body 50, 50 at the use position (A) is rotated outward, and both gripping pieces 56, 56 are brought close to the outer side of the traveling unit 1 as shown in FIG. 8 (b). In the stowed storage position (b), the gripping pieces 56 and 56 are positioned directly below the preliminary seedling placing stands 57 and 57 erected on the left and right front portions of the machine body frame 4.

  The base end portion of each arm body 50, 50 is pivotally supported about the vertical axis of each pivot shaft 52, 52 via the boss portion 60, 60, and at the lower end portion of each pivot shaft 52, 52. Is coaxially pivoted in the middle of the fulcrum crossing arm bodies 58, 58 that are lock link members, and a tension spring 61 that extends in the left-right direction is interposed between the front parts of both fulcrum crossing arm bodies 58, 58. On the other hand, the rear portions of both fulcrum-overarm bodies 58, 58 are connected via a connecting pin 62.

The tension spring 61 is interlocked with the pivoting of the arm bodies 58, 58 beyond the fulcrum, as shown in FIG. 9, and the forward positions of the pivots 52, 52 and the pivots 52, 52 as shown in FIG. It moves beyond the fulcrum to the rear position, and is elastically urged in a pulled state in a direction in which the front parts or rear parts of the fulcrum passing arm bodies 58, 58 are brought close to each other.
Then, a connecting groove 63 is formed in the rear part of one fulcrum passing arm body 58, and the rear parts of both fulcrum passing arms 58 and 58 are connected to each other by a connecting pin 62 in a vertically superposed state via the connecting groove 63. is doing.

  In addition, the base end portion of the auxiliary operation lever 64 is connected to the front end portion of the other fulcrum crossing arm body 58, and the front end portion of the differential lock interlocking rod 65 is connected to the rear end portion. As shown in FIGS. 3 and 4, this portion is connected to the other end portion of the interlocking lever 44 provided at the lower end portion 33a of the operation shaft 33 of the differential lock mechanism 32. 66 is a buffer spring, and 67 is a spring support piece.

  In this way, when the operator rotates the auxiliary operation lever 64 outward about the pivot shaft 52 (diff lock release operation) as shown in FIG. The bodies 58 and 58 are rotated so that the rear ends of the arm bodies 58 and 58 beyond both fulcrums can be rotated and displaced forward, and the differential lock mechanism 32 can be brought into the differential lock release state. Yes.

On the other hand, when the operator rotates the auxiliary operation lever 64 inward about the pivot 52 (diff lock operation) as shown in FIG. Is rotated so that the rear ends of both fulcrum-overarm bodies 58, 58 can be rotated and displaced rearward, and the diff lock mechanism 32 can be brought into a diff lock state.
At this time, the tension spring 61 moves over the fulcrum between the front and rear positions of the pivot shafts 52 and 52 in conjunction with the pivoting movement of the arm bodies 58 and 58 over both fulcrums, and at either position. A tension elastic biasing force is applied to the both fulcrum-passing arm bodies 58 and 58 so that the posture of the both fulcrum-passing arm bodies 58 and 58 is maintained.

Further, a steering lock body 70 is disposed between the both fulcrum passing arm bodies 58 and 58 and the steering operation arm 24, and the steering lock body 70 is a lock main piece formed in a square plate shape. 71, a front contact piece 72 that extends downward from the front edge of the lock main piece 71 and integrally molded, and a portion that extends upward from the rear edge of the lock main piece 71 and integrally molded The rear abutting piece 73 is formed.
In addition, a front / rear sliding guide hole 74 extending in the front / rear direction is formed in the central portion of the lock piece 71, and a mounting bolt 75 is inserted into the front / rear sliding guide hole 74 from below, so that the mounting bolt 75 Thus, the lock main piece 71 is attached to the attachment body 51 so as to be slidable back and forth.

Thus, the front end surface portion 24a of the steering operation arm 24 is planar, and the rear abutment piece 73 of the lock body 71 abuts against the front end surface portion 24a of the steering operation arm 24 and is biased toward the steering operation arm 24. The handle is regulated in a flat shape. Therefore, when an excessive load is applied to the handle, the lock main body 71 biased by the tension spring 61 is pushed back and the steering lock is released, so that a failure such as breakage of the steering gear is prevented.
In addition, since the auxiliary operation lever 64 is provided on the one fulcrum passing arm body 58, the lever can be positioned freely, and a separate structure such as a detent is not required.
One end of the tension spring 61 is attached to the adjustment tool 61a, and the relative position of the adjustment tool 61a with respect to the tension spring 61 is fixed by the nut 61b. Therefore, the restoring force of the tension spring 61 can be easily adjusted by the rotation of the nut 61b, and the load for restricting the handle can be appropriately set and changed according to the field conditions. Since the tension spring 61 is detachable, it may be appropriately replaced with another spring having a different restoring force.

Further, when the auxiliary operation lever 64 is differentially operated, the rear portions of the arm bodies 58 and 58 beyond both fulcrums are rotated and displaced rearward, and the steering lock body 70 is pressed rearward via the front contact piece 72. Therefore, the steering lock body 70 is slid rearward, and the rear abutment piece 73 abuts against the front end surface portion 24a of the steering operation arm 24 in a pressed state, and locks (rotates) the steering operation arm 24. I have to.
Therefore, the differential lock mechanism 32 can be brought into the differential lock state by the differential lock operation of the auxiliary operation lever 64, and the steering mechanism 22 can be brought into the locked state via the steering operation arm 24.

  Further, as shown in FIG. 6, the auxiliary operation lever 64 is formed by raising the base end portion in a substantially orthogonal state above the arm body 58 above the fulcrum to form an arm body engaging portion 64a. At the front end of the fulcrum crossing arm body 58, which is different from the crossing arm body 58, an engagement piece 76 is provided so as to project the axis in the vertical direction, and in the differential lock operation state, the engagement piece 76 and the above arm body A pair of left and right arm bodies 50, 50 in the use position (A) are brought into contact with and engaged with the engaging portion 64a from the inside. Reference numeral 77 denotes a rotation restricting piece that restricts the rotation of the arm body 53 beyond the fulcrum during the differential lock releasing operation.

In this way, when both arm bodies 50, 50 in the use position (A) are rotated outward to change the position to the storage position (B), the engagement between the engagement piece 76 and the auxiliary operation lever 64 is performed. Through the joint portion 64a, the postures of the both fulcrum passing arm bodies 58, 58 are changed to the diff-lock release state, and the lock of the steering operation arm 24 is released.
Therefore, it is possible to save the trouble of performing the diff-lock release operation again by the auxiliary operation lever 64 by the position change operation from the use position of both the arm bodies 50, 50 to the storage position.

  In addition, when the auxiliary operation lever 64 is changed to the diff lock state with both arm bodies 50, 50 in the storage position, both arm bodies 50, 50 are repositioned to the use position in conjunction with it, An operator who is sitting on the driver's seat with both arm bodies 50, 50 in such a use position can easily see and can prevent the diff lock and the auxiliary operation lever 64 from forgetting to perform the diff lock release operation. As a result, safety can be ensured.

As shown in FIG. 5, temporary fixing bodies 78, 78 are connected to the upper surface of each fulcrum overarm body 58, 58, and each temporary fixing body 78, 78 is provided with each arm body 50, 50. Temporary fixing recesses 79, 79 for temporary fixing at the usage position and storage position temporary fixing recesses 80, 80 for temporarily fixing the arm bodies 50, 50 at the storage position are formed.
On the other hand, the central portion of the leaf spring body 82 is attached to the attachment body 51 via the leaf spring body support pin 81, and the left and right side pieces 82a and 82a of the leaf spring body 82 are respectively extended toward the front outer side and the outside. The front end portions 82b and 82b of the left and right side pieces 82a and 82a are brought into contact with the inner peripheral edge portions of the temporary fixing bodies 78 and 78, respectively.

Thus, when each arm body 50, 50 is rotated to the use position, the use position temporary fix recesses 79, 79 formed in each temporary fix body 78, 78 are inserted into the tip portions of the left and right side pieces 82a, 82a. 82b and 82b are engaged in a pressed state, and the arm bodies 50 and 50 can be temporarily fixed to the use positions via the fulcrum-passing arm bodies 58 and 58 connected to the temporary fixing bodies 78 and 78, respectively. I can do it.
Further, when each arm body 50, 50 is rotated to the storage position, the front end portions 82b, 82b of the left and right side pieces 82a, 82a are inserted into the storage position temporary fixing recesses 80, 80 formed in the temporary fixing bodies 78, 78, respectively. Are engaged in a pressed state so that each arm body 50, 50 can be temporarily fixed at the storage position via each fulcrum-overarm body 58, 58 provided continuously to each temporary fixing body 78, 78. ing.

In this way, the base end portions of the pair of left and right arm bodies 50, 50 are attached so as to be rotatable about the vertical axis, so that the grip pieces 56, 56 at the distal end portion are in the storage position (b) close to the machine body. By rotating a certain arm body 50, 50 in the forward direction, the gripping pieces 56, 56 at the tip can be easily changed to the use position (A) separated from the machine body, and the use position ( By holding the gripping pieces 56, 56 of the arm bodies 50, 50 in step b), it is easy to use the lever principle to push down the front part of the machine or pull it up. And it can be done reliably.
Accordingly, when the machine body is moved over the ridge so as to escape from the field, the operation of pushing down the front part of the machine body downward or pulling it up can be efficiently performed as appropriate.

At this time, by providing a pair of left and right arm bodies 50, 50 at the front end portion of the traveling unit 1, the operator can hold the grip pieces 56, 56 of both arm bodies 50, 50 with only one hand or both left and right hands. As a result, the front part of the airframe can be pushed down or pulled up in a well-balanced manner via both arm bodies 50, 50, and the efficiency of such work can be significantly improved.
In addition, since the operator can enter between the gripping pieces 56, 56 of the pair of left and right arm bodies 50, 50 and operate both arm bodies 50, 50 near the operator's waist, the operator can It becomes easy to apply force to the arm bodies 50, 50, and the front part of the aircraft can be pushed down downward or pulled up upward easily.
Therefore, even if the operator is a woman or an elderly person who is relatively inferior in physical strength, the above work can be easily performed, and fatigue of such work can be reduced.

  As described above, the riding rice transplanter according to the present invention smoothly releases the steering lock when an excessive load is applied to the steering wheel. Therefore, the riding rice transplanter can be used for rice planting work because it can prevent a failure such as damage to the steering gear. It is done.

The side view of the riding rice transplanter which concerns on this invention. Plane explanatory drawing of a steering mechanism. Explanatory drawing of the connection structure of a differential lock lever and a differential lock lever. The bottom view of an interlocking lever. Explanatory drawing of the bottom of the arm body beyond the fulcrum. The side view of an arm body. The front view of the same arm body. Operation | movement explanatory drawing of the same arm body. Explanatory drawing of the use position of the arm body. Storage position explanatory drawing of the arm body.

Explanation of symbols

Passenger rice transplanter A, engine E, fixed interval W, traveling part 1, planting part 2, lifting mechanism 3, fuselage frame 4, prime mover part 5, driving part 6, mission case 7, front wheel 8, rear wheel 9, Front / rear extension frame forming piece 10, rear part 10a, inclined frame forming piece 11, left / right extension frame forming piece 12, steering column 13, steering support shaft 14, steering wheel 15, seat 16, shift lever 17, clutch / brake lever 18, planting Lift lever 19, differential lock lever 20, front axle case 21, steering mechanism 22, support frame 23, steering operation arm 24, front end surface 24a, arm pivot 25, internal gear 26, small gear 27, knuckle arm 28, tie rod 29, front wheel drive shaft 30, differential mechanism 31, differential lock mechanism 32, conversion shaft 33, lower end 33a, planting mission case 35, seedling stand 36, planting claw 37, float 38, input shaft 39, PTO shaft 40, transmission shaft 4 1, top link 42, lower link 43, interlocking lever 44, interlocking wire 45, arm body 50, mounting body 51, pivot 52, forward extension piece 53, upward rising piece 54, outward extension piece 55, gripping piece 56, spare Seedling stand 57, fulcrum arm body 58, boss part 60, tension spring 61, adjustment tool 61a, nut 61b, connecting pin 62, connecting groove 63, auxiliary operating lever 64, arm body engaging part 64a, differential lock interlocking rod 65, buffer spring 66, spring support piece 67, steering lock body 70, lock main piece 71, front contact piece 72, rear contact piece 73, front and rear sliding guide hole 74, mounting bolt 75, engagement piece 76, Rotation restricting piece 77, temporary fixing body 78, use position temporary fixing concave part 79, storage position temporary fixing concave part 80, leaf spring body support pin 81, leaf spring body 82, left and right side piece 82a, tip part 82b

Claims (2)

In a riding rice transplanter in which the planting part is connected to the rear of the traveling part so that it can be moved up and down, left and right arm bodies are provided at the front end of the traveling part, and the lifting of the front part of the traveling part can be prevented via the arm body A planar portion is provided at the front portion of the steering operation system member in the steering mechanism between the steering support shaft and the front axle case, and the rear portion of the steering lock body connected to the member is in contact with the planar portion of the member and The left and right sides of the left and right arm bodies are elastically coupled to the pivots which are provided with a locking body plane portion urged toward the member and pivotally support the base end portions of the left and right arm bodies about the vertical axis. Each midway part of the lock link member is pivotally supported coaxially, and the rear parts of the left and right lock link members are vertically overlapped via a connecting groove formed in the rear part of one lock link member In connecting, further on the front end portion of one of the lock link member, the proximal end portion of the auxiliary operating lever for actuating the steering lock mechanism for locking the steering consecutively provided, wherein the rotational operation of the auxiliary operating lever The lock link member can be rotated around the pivot , and the steering operation is performed by the elastic body by the differential lock operation of the auxiliary operation lever or the rotation of the lock link member accompanying the rotation of the arm body to the storage position. The riding rice transplanter, wherein the steering lock body biased toward the system member is locked and released.   The riding rice transplanter according to claim 1, wherein the elastic body is installed via an adjustment tool for restoring force.

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