JP3776051B2 - Power transmission structure of seedling planting device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is configured to drive a planting mechanism via a hook clutch, and a meshing clutch with a fixed position stop function capable of operating the hook clutch only within a set range of the planting claw operating phase. It is related with the power transmission structure of the seedling planting apparatus comprised so that a planting nail might stop in the predetermined height range which surfaced from the rice field.
[0002]
[Prior art]
In the rice transplanter, a planting clutch is provided in the power transmission of the saddle clutch, and this planting clutch is also configured as a meshing clutch with a fixed position stop function. Conventionally, as shown in FIG. 17, the planting clutch cutting range A is within the planting claw tip turning trajectory S in the rotary planting mechanism 17 for planting the planting by cutting out the planting from the lower end of the seedling table 16. Is set to include the close clutch disengagement range B.
[0003]
In addition, as disclosed in Japanese Patent Application Laid-Open No. 2001-95329, as a conventional saddle clutch, a pawl clutch member constituting the saddle clutch is shifted in the clutch engagement direction, and the outer periphery of the pawl clutch member is Are provided with a check flange located on the clutch engagement direction side and an operation flange facing the clutch release direction side with a predetermined distance from the clutch release direction side, and a notch is formed at a predetermined position in the circumferential direction of the check flange. An operation shaft that forcibly shifts the clutch member in the clutch disengagement direction is arranged so as to be rotatable around an axis that is orthogonal to the shift direction of the pawl clutch member, and a part of the outer peripheral surface of the clutch operation shaft is cut out flat. Thus, a substantially semi-circular operation cam and a check pin that contact the inner surface of the operation flange are formed. When the clutch is engaged, the check pin is And engaged in an annular groove formed between the operating flange and Nji, claw clutch member is known in which only restrain the pin is configured to be enters the notch when in the predetermined rotational phase.
[0004]
[Problems to be solved by the invention]
If the planting clutch disengagement range A and the saddle clutch disengagement range B are set with respect to the planting claw tip turning trajectory as described above, for example, the planting clutch is disengaged at the starting point of the cormorant clutch disengagement range B. When the hook clutch is disengaged in this state, the pawl clutch member is disengaged while the one edge of the restraining pin is rubbed strongly against the end face of the pawl clutch member constituting the saddle clutch facing the notch. Even if it is going to shift to the next clutch, the operation shaft is less likely to return to the clutch engagement direction due to the strong friction between the notch end face of the check flange and the check pin, Occasionally, there was a case where the return rotation was stopped.
[0005]
The present invention has been made paying attention to such points, and it is a main object of the present invention to ensure a smooth and smooth return after operating a closing clutch having a fixed position stop function. .
[0006]
[Means for Solving the Problems]
[Configuration, Action, and Effect of Invention of Claim 1]
[0007]
(Structure) The invention according to claim 1 is configured to drive the rotary planting mechanism via the saddle clutch, and the clutch clutch is operated only in a set range of the planting claw rotation phase. In a power transmission structure of a seedling planting device configured as a meshing clutch with a fixed position stop function capable of shifting, the pawl clutch member constituting the hook clutch is biased in the clutch engagement direction, and the biasing force in the clutch engagement direction A clutch operating shaft for shifting the pawl clutch member in the clutch disengagement direction is provided, and a planting clutch comprising a meshing clutch with a fixed position stop function is provided on the transmission power of the saddle clutch, and this planting clutch The clutch disengagement start phase of the clutch is delayed from the clutch disengagement start phase of the closing clutch operated by the clutch operating shaft. It is set so that it is.
[0008]
(Operation) According to the above configuration, when the planting clutch is disengaged, the hook clutch is in a phase advanced from the starting point of the hook clutch disengagement range , so that the edge of the clutch operating shaft defines the fixed position stop position. located restraint surface state apart in the circumferential direction of the member, when the clutch operating shaft of the clutch when ridge and rotating operation in the clutch disengaging direction, the edges of the clutch operating shaft without rubbing against the restraining surface of the claw clutch member displacement To do. Accordingly, if the closing clutch is subsequently operated to engage the clutch, the clutch operating shaft returns and rotates without rubbing resistance, and the pawl clutch member smoothly returns and shifts to the engaged position.
[0009]
(Effects) Therefore, according to the first aspect of the present invention, it is possible to reliably and smoothly return the pawl clutch member to the clutch-engaged state after operating the closing clutch provided with the fixed position stop function. It was.
[0010]
[Configuration, Action, and Effect of Invention of Claim 2]
[0011]
(Structure) The invention according to claim 2 is configured to drive the rotary planting mechanism via the hook clutch, and the clutch clutch is operated only in a set range of the planting claw rotation phase. In a power transmission structure of a seedling planting device configured as a meshing clutch with a fixed position stop function capable, the pawl clutch member constituting the hook clutch is biased and shifted in the clutch engagement direction, and the outer periphery of the pawl clutch member Are provided with a check flange located on the clutch engagement direction side and an operation flange facing the clutch release direction side with a predetermined distance from the clutch release direction side, and a notch is formed at a predetermined position in the circumferential direction of the check flange. The operation shaft for forcibly shifting the clutch member in the clutch disengagement direction can be rotated around the axis perpendicular to the shift direction of the claw clutch member. And a part of the outer peripheral surface of the clutch operation shaft is cut out flat to form a substantially semicircular operation cam and a check pin that contact the inner surface of the operation flange. The check pin is engaged with an annular groove formed between the check flange and the operation flange, and is configured to be able to enter the notch only when the pawl clutch member is in a predetermined rotation phase. Of the flange end faces facing the notch in the flange, the flange end face on the lower side in the rotation direction of the claw clutch member is formed as an inclined end face toward the operation flange side, and the claw clutch member is shifted by the maximum stroke in the clutch release direction. In this state, the angle of the tangent at the contact point between the check pin and the inclined flange end surface with respect to the rotational axis of the inclined flange end surface is larger than the angle with respect to the rotational axis of the inclined flange end surface. Characterized in that are angularly set larger that.
[0012]
(Operation) According to the above configuration, in the state where the pawl clutch member is slid at the maximum stroke in the clutch disengagement direction, even if the inclined flange end surface of the restraining flange contacts the restraining pin, the clutch operating shaft moves toward the clutch engagement direction. Therefore, the clutch operating shaft is smoothly pushed back and turned in the clutch engagement direction by the spring force acting on the claw clutch member.
[0013]
(Effect) Therefore, according to the invention of claim 2, it is possible to surely and smoothly return to the clutch-engaged state after operating the closing clutch.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 and FIG. 2 show a 6-row planting type rice transplanter as an example of a paddy field machine. This riding type rice transplanter has a six-row planting seedling planting device 4 at the rear of a riding type traveling machine body 3 having a pair of left and right front wheels 1 that can be steered and a pair of left and right rear wheels 2 that cannot be steered. Are connected to each other through a four-link mechanism 6 driven by a hydraulic cylinder 5, and a six-part fertilizer 7 is provided at the rear of the machine body.
[0015]
A transmission case 9 that pivotally supports the front wheel 1 is connected and fixed to the front part of the body frame 8 of the traveling body 3, and a rear transmission case 10 that pivotally supports the rear wheel 2 is disposed at the rear part of the body frame 8. It is supported to roll freely. As shown in FIGS. 3 to 5, the rear transmission case 10 is rotatably supported around a pair of front and rear bearing brackets 11 and 12 and a front and rear axis P that are detachably bolted to the body frame 8. A coil spring 14 is interposed between the left and right spring seats 13 projecting from the rear transmission case 10 and the left and right portions of the machine body frame 8 so that the rear transmission case 10 is elastically neutrally restored. The coil spring 14 is surrounded and held at a position by a guide 15 attached to the rear bearing bracket 12.
In addition, an engine 21 is mounted in the vicinity of the front of the mission case 9 via a front frame 22, and a steering handle 23 for steering the front wheels 1 is installed in a boarding operation unit located behind the engine 21. A driver's seat 24, a step 25, and the like are provided.
[0016]
The seedling planting device 4 mounts seedlings for 6 lines and cuts seedlings one by one from the lower ends of the seedling stage 16 and the seedling stage 31 which are reciprocated by a set stroke in the left-right direction and plant them on the field. It consists of six sets of rotary planting mechanisms 17 and three leveling floats 18 for leveling the planting location, etc., and reserve seedlings to be supplied to the seedling table 16 are placed in a plurality of stages. Spare seedling platforms 19 to be accommodated are arranged on the left and right of the front part of the aircraft.
[0017]
The fertilizer application device 7 is mounted on the traveling machine 3 between the driver seat 15 and the seedling planting device 4, and a fertilizer hopper 26 for storing powdered fertilizer and a set amount of fertilizer in the fertilizer hopper 26. An unwinding mechanism 27 for unwinding and an electric fan 30 for wind-feeding the unloaded fertilizer to the groove forming device 29 included in the leveling float 18 via the supply hose 28 are provided.
[0018]
6 and 7 schematically show the transmission structure of this rice transplanter. A hydraulic continuously variable transmission (HST) linked to the engine 21 is connected to the side surface of the transmission case 9 as a main transmission 31, and the output is input to the transmission case 9 to be used as a traveling system and a working system. Branch off. The main transmission 31 can be steplessly moved forward and backward by a main transmission lever 32 provided on the left side of the steering handle 23.
[0019]
The traveling system power is shifted in two steps by the gear-type sub-transmission mechanism 33 and then branched again to the front wheel system and the rear wheel system. The power of the front wheel system is shifted to the left and right front wheels via a differential device 34 that can be differentially locked. 1 and the power of the rear wheel system is transmitted to the rear transmission case 10 via the transmission shaft 35 and to the left and right rear wheels 2 via the multi-plate side clutch 36. The subtransmission mechanism 33 can be shifted by a subtransmission lever 37 provided on the left side of the driver seat 24. The differential device 34 is differentially locked by depressing a differential lock pedal 38 provided at the foot, so that the left and right front wheels 1 are driven at a constant speed.
[0020]
Further, the rear transmission case 10 is equipped with a multi-plate brake 39 for stopping the airframe, and this brake 39 is mechanically linked to a single pedal 40 provided at the right front portion of the step 25. ing.
[0021]
Although the description of the detailed structure is omitted, the left and right side clutches 36 are mechanically linked to the front wheel steering mechanism, and when the front wheel 1 is steered to the left or right by the steering handle 23 beyond the set angle, The side clutch 36 of the rear wheel 2 that is on the inside of the turn is automatically turned off so that the turn is performed smoothly and smoothly.
[0022]
Further, the power of the work system branched in the mission case 9 is taken out only by the one-way clutch 41, and the PTO shaft 44 passes through the inter-gear transmission mechanism 42 and the planting clutch 43 capable of six-speed gear shifting. And is transmitted to the seedling planting device 4 through the transmission shaft 45.
[0023]
The present invention is characterized by the transmission structure to the seedling planting device 4, and the configuration thereof will be described below.
[0024]
As shown in FIG. 8, the planting clutch 43 is composed of an output bevel gear 46 loosely fitted to the PTO shaft 45, and a claw clutch member 47 slidably fitted to the PTO shaft 44. When the claw clutch member 47 is slid and biased toward the output bevel gear 46 by the spring 48, the transmission claw 47a of the claw clutch member 47 is engaged with the transmission claw 46a of the output bevel gear 46, and the clutch is engaged. The clutch member 47 is displaced backward against the spring 48 and the transmission claws 46a, 47a are disengaged from each other, thereby bringing about a clutch disengaged state.
[0025]
The planting clutch 43 is provided with a fixed position stop function that enables clutch disconnection operation only at a predetermined rotational phase. That is, the pawl clutch member 47 is formed with a cam surface 47b whose height in the axial direction changes in accordance with the rotation phase, and a clutch operation pin 49 is provided on the side surface of the transmission case 9 so as to be retractable. As shown in the figure, when the clutch operating pin 49 is retracted and disengaged from the claw clutch member 47, the clutch is engaged. When the clutch operation pin 49 is elastically biased in the direction of entry, the clutch operation pin 49 is plunged into the interference area with the cam surface 47b with the lowest phase of the cam surface 47b, and as the pawl clutch member 47 rotates. The cam surface 47b rides on the fixed position clutch operating pin 49, the pawl clutch member 47 is gradually retracted against the spring 48, and the transmission pawls 46a and 47a are disengaged from each other. The highest portion of 47b rides on the clutch operation pin 49, and at this point, the clutch is disengaged. The phase range in which the planting clutch 43 is disengaged in this way is the A range in the planting claw tip turning locus S in the planting mechanism 17 as shown in FIG.
[0026]
As shown in FIG. 9, the power for planting work taken out from the PTO shaft 44 is input to the feed case 51 of the seedling planting device 4 through the transmission shaft 45, and then the screw shaft 52 for laterally feeding the seedling table and The planting mechanism 17 that is transmitted to the seedling vertical feed drive shaft 53 and transmitted to the three planting cases 55 via the planting lateral transmission shafts 54 and mounted on the left and right of the rear end of each planting case 55 is provided. It is designed to be driven.
[0027]
As shown in FIG. 10, a planting input shaft 56 connected to the transmission shaft 54 is supported at the base of the planting case 55, and a planting drive shaft that drives the planting mechanism 17 at the rear end of the planting case 55. 57 is supported, and a drive-side sprocket 58 loosely fitted on the planting input shaft 56 and a driven-side sprocket 59 loosely fitted on the planting drive shaft 57 are wound around the chain 60 and interlocked. The planting input shaft 56 and the drive-side sprocket 58 are interlocked and connected via a torque limiter 61, and the driven-side sprocket 59 and the planting drive shaft 57 are interlocked and connected via a saddle clutch 71.
[0028]
The torque limiter 61 has a structure in which a transmission member 62 slidably mounted on the planting input shaft 56 is slidably biased by a spring 63 and meshed with the drive side sprocket 58 from the axial direction. When the load of the planting drive shaft 57 increases and the load torque acting on the drive-side sprocket 58 reaches a set value, the transmission member 62 moves backward against the spring 63 due to climbing of the meshing claws, and transmission The transmission of power from the member 62 to the drive-side sprocket 58 is cut off, and an excessive load is avoided on the planting mechanism 17.
[0029]
The saddle-clutch 71 is used when a small number of plants such as two-row planting, four-row planting, etc. are performed while resting a part of the six-row planting mechanism 17 in the planting process near the coast. The pawl clutch member 72 slidably mounted on the planting drive shaft 57 is slidably energized by a spring 73 and meshed with the driven sprocket 59 from the axial direction. Three saddle clutches 71 provided for each planting case 55 are linked to three saddle clutch levers 80 (not shown) provided behind the driver seat 24 via wires 81, and can be arbitrarily entered and manipulated. Be able to.
[0030]
The saddle clutch 71 is also provided with a fixed position stop function that enables a clutch disengagement operation only at a predetermined rotational phase. That is, as shown in FIGS. 12 and 13, on the outer periphery of the pawl clutch member 72, there are a check flange 74 located on the clutch engagement direction side and an operation flange 75 facing the clutch release direction side at a predetermined interval. A portion of the clutch operating shaft 76 that is provided in the planting case 55 so as to be able to rotate around the longitudinal axis P is inserted into the case between the operating flange 75 and the check flange 74. The claw clutch member 72 is slid by the forward / reverse rotation of the clutch operating shaft 76 so that the clutch is engaged / disengaged.
[0031]
Here, a part of the outer peripheral surface of the clutch operating shaft 76 that has entered into the case is cut out flat to form an operation cam 76a and a check pin 76b having a substantially semicircular cross-sectional shape, In the clutch-engaged state, as shown in FIGS. 11 (a) and 14 (a), the eccentric plane of the operation cam 76 a faces the inner surface of the operation flange 75 in parallel, and the check pin 76 b has both flanges 74. , 75 engages with the annular groove m formed between the two, and the pawl clutch member 72 rotates. Further, a notch 77 is formed in a predetermined phase range of the check flange 74, and the pawl clutch member 72 can be slid in the clutch disengagement direction only in a phase where the notch 77 faces the check pin 76b. 76 is allowed to rotate. When the clutch operating shaft 76 is rotated, the pawl clutch member 72 resists the spring 73 by pressing the operating flange 75 with the edge of the operating cam 76a as shown in FIG. As a result, the meshing from the driven side sprocket 59 is released and the power transmission to the planting drive shaft 57 is cut off. The phase range in which the saddle clutch 71 is disengaged in this way is the B range in the planting claw tip turning locus S in the planting mechanism 17 as shown in FIG.
[0032]
That is, it is set so as to have a delay in the claw rotation direction compared to the phase range B in which the saddle clutch 71 is disengaged compared to the phase range A in which the planting clutch 42 is disengaged. Therefore, in the state where the planting clutch 42 is disengaged, the restraining pin 76b in the saddle clutch 71 is in a phase advanced from the starting point of the saddle clutch disengaging range B, so that the end edge of the restraining pin 76b is in the restraining flange 74. The edge of the check pin 76b is rubbed against the notch end face of the check flange 74 when the clutch operating shaft 76 of the saddle clutch 71 is rotated in the clutch cut direction. Displace without Therefore, when the closing clutch 71 is operated thereafter, the clutch operating shaft 76 returns and rotates without rubbing resistance, and the pawl clutch member 72 smoothly returns and shifts to the clutch engaged position.
[0033]
Further, the flange end surface e on the lower side in the direction of rotation of the claw clutch member among the both end surfaces facing the notch 77 in the check flange 74 is formed at an inclined end toward the operation flange 75 side, and the claw clutch member 72 is a clutch. In the state of sliding with the maximum stroke in the cutting direction, the rotational axis X of the inclined flange end surface e is greater than the angle α of the tangent L to the rotational axis X at the contact point f between the restraining pin 76b and the inclined flange end surface e. The angle β with respect to is set large (β> α).
[0034]
According to this, as shown in FIG. 14C, even when the pawl clutch member 72 is slid at the maximum stroke in the clutch disengagement direction, even if the inclined flange end surface e of the check pin 76b contacts the check pin 76b. The resistance acting on the contact portion with respect to the rotation of the clutch operation shaft 76 in the clutch engagement direction (clockwise in FIG. 14) is small, and the clutch operation shaft 76 is moved in the clutch engagement direction by the spring force acting on the pawl clutch member 72. It is smoothly pushed back and rotated.
[Brief description of the drawings]
[Fig. 1] Whole side view of rice transplanter [Fig. 2] Overall plan view of rice transplanter [Fig. 3] Rear view showing rear transmission case support structure [Fig. 4] Side view showing main parts of rear transmission case support structure [Fig. Fig. 5 is a longitudinal rear view showing the main part of the rear transmission case support structure. Fig. 6 is a schematic diagram showing the transmission structure of the traveling system. Fig. 7 is a schematic diagram showing the transmission structure of the working system. Sectional view showing a part of the structure [Fig. 9] Plan view showing the drive structure of the seedling planting device [Fig. 10] Transverse plan view of the planting case [Fig. 11] Vertical rear view of the hook clutch [Fig. FIG. 13 is a side view of the saddle clutch. FIG. 14 is a plan view showing the operation of the saddle clutch. FIG. 15 is a cross-sectional plan view enlarging the main part of the saddle clutch operating structure. Side view showing planting claw tip turning locus and clutch disengagement range in the invention [FIG. 17] Side view of a planting claw end rotational locus and clutch disengaging range [Description of symbols]
17 Planting mechanism 42 Planting clutch 71 Collapsing clutch 72 Claw clutch member 74 Checking flange 75 Operating flange 76 Clutch operating shaft 76a Operating cam 76b Checking pin 77 Notch e Inclined flange end face f Contact point m Annular groove L Tangent X Rotation Axis α angle β angle

Claims (2)

The seedling is configured to drive the planting mechanism via a hook clutch, and the hook clutch is configured as a meshing clutch with a fixed position stop function capable of clutch disconnection operation only within a set range of the planting claw operating phase. In the power transmission structure of the planting device,
A clutch operating shaft that shifts and biases the claw clutch member constituting the saddle clutch in the clutch engagement direction and shifts the claw clutch member in the clutch disengagement direction against a biasing force in the clutch engagement direction;
A planting clutch comprising a meshing clutch with a fixed position stop function is provided on the transmission power of the saddle clutch, and the clutch disengagement phase of the saddle clutch is operated by the clutch operating shaft for the clutch disengagement start phase of the planting clutch. A power transmission structure for a seedling planting device, wherein the power transmission structure is set so as to be delayed from a start phase. The seedling is configured to drive the planting mechanism via a hook clutch, and the hook clutch is configured as a meshing clutch with a fixed position stop function capable of clutch disconnection operation only within a set range of the planting claw operating phase. In the power transmission structure of the planting device,
The pawl clutch member constituting the saddle clutch is biased in the clutch engagement direction, and the outer periphery of the pawl clutch member is provided with a check flange located on the clutch engagement direction side and with a predetermined interval from the clutch release direction side. While providing an opposing operation flange, and forming a notch at a predetermined position in the circumferential direction of the check flange,
An operation shaft that forcibly shifts the claw clutch member in the clutch disengagement direction is provided so that it can be rotated around an axis that is orthogonal to the shift direction of the claw clutch member, and a part of the outer peripheral surface of the clutch operation shaft is cut off flatly. Then, a substantially semi-circular operation cam and a check pin that contact the inner surface of the operation flange are formed, and in the clutch-engaged state, the check pin is formed between the check flange and the operation flange. Engaging in the groove, and configured to be able to enter the notch only when the pawl clutch member is in a predetermined rotation phase,
Of the flange end faces facing the notch in the restraining flange, the flange end face on the lower side in the rotation direction of the claw clutch member is formed as an inclined surface toward the operation flange side, and the claw clutch member has a maximum stroke in the clutch release direction. The angle of the inclined flange end face with respect to the rotational axis is set larger than the angle of the tangent to the rotational axis at the contact point between the restraining pin and the inclined flange end face. Power transmission structure for planting equipment.

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