JP4157875B2 - Transplanter - Google Patents

Description

  The present invention relates to a transplanter including an inconstant speed transmission device that causes a periodic speed change in rotation of a planting drive shaft.

  An inconstant speed transmission device that causes periodic speed fluctuations in the rotation of the planting drive shaft, and increases the scraping speed of the seedling and the operating speed in the soil, and the scraping from the seedling platform as the planting drive shaft rotates. A transplanter having a plurality of planting devices for planting a taken seedling in the soil is known (see, for example, Patent Document 1).

  In the transplanter, it is possible to increase the speed of the planting claws in the soil and transplant the planted seedling without disturbing the posture or falling down. However, since the planting claw repeats the high speed state and the low speed state twice each time the planting claw rotates once, when the transition is made from the high speed state to the low speed state, the planting claw has a power transmission due to its inertia with respect to the drive shaft on the input side. Since the gears constituting the system are rotated in advance by the backlash of the gears constituting the system, the vibration and noise generated when shifting from the low speed state to the high speed state become large, which may cause trouble.

  In order to solve such problems, an inconstant speed transmission device that causes periodic speed fluctuations in the rotation of the planting drive shaft and increases the scraping speed of the seedling and the operation speed in the soil, and the planting drive shaft Along with the rotation, it has a plurality of planting devices for planting the seedlings scraped from the seedling platform into the soil, and each planting device is periodic with respect to the rotation transmitted from the inconstant speed transmission device. There is known a transplanter equipped with a brake mechanism that applies a braking force to take a backlash of an inconstant speed transmission device (see, for example, Patent Document 2).

JP 2002-330608 A (page 4-5, FIG. 7) JP 2004-180562 A (page 6-7, FIG. 15)

  In the transplanter, since the rotation of the planting device can be pushed by the brake mechanism, it is possible to suppress vibration and noise generated by backlash of the transmission system when shifting from high speed rotation to low speed rotation. However, since the planting drive shaft of each planting device is provided with a brake mechanism, the configuration of the planting transmission system becomes complicated.

  In view of the above circumstances, the present invention provides a planting power transmission system in which a planting power transmission device arranged on the upstream side of a transmission branching to each planting device is interposed with a brake mechanism that brakes the preceding movement due to the inertia of the planting device. An object of the present invention is to provide a transplanter capable of simplifying the configuration.

In order to achieve the object, the present invention according to claim 1 transmits the rotation from the engine to the planting power transmission device (51), and further from the power transmission device (51) to each planting device (31). A transplanter (1) comprising: a planting transmission system for branching and transmitting; and a traveling transmission system for transmitting rotation from the engine to the traveling wheels (12, 15) via the traveling power transmission device (41). In
A brake mechanism for applying a braking force to the planting power transmission device (51) periodically and releasing the braking force during one rotation of the planting device (31). (83)
The transplanter is characterized by that.

According to a second aspect of the present invention, there is provided an inconstant speed transmission device (36) having the inconstant speed transmission gear train (76) and the brake mechanism (83) in the planting power transmission device (51). Intervening,
The transplanter according to claim 1.

According to a third aspect of the present invention, the planting power transmission device (51) includes the inconstant speed transmission gear train (76), the reduction transmission gear train (102), and the brake mechanism (83). Having an inconstant speed / deceleration transmission device (101) having,
The transplanter according to claim 1.

  The reference numerals in the parentheses are for reference to the drawings and do not limit the present invention.

  According to the first aspect of the present invention, the planting power transmission device arranged on the upstream side of the transmission branched to each planting device is subjected to the preceding movement due to the inertia of the planting device caused by the inconstant speed transmission gear train. Since a brake mechanism for braking is interposed, one brake device is sufficient regardless of the number of planting devices, compared to the case where a brake mechanism is provided on the planting drive shaft of each planting device as in the prior art. The configuration can be simplified.

  According to the second aspect of the present invention, since the inconstant speed transmission gear train and the brake mechanism are interposed in the planting transmission device as one unit, the inconstant speed which is the above unit can be improved by slightly improving the existing model. A transmission can be deployed.

  According to the third aspect of the present invention, the inconstant speed transmission gear train, the reduction transmission gear train, and the brake mechanism are interposed as one unit in the planting transmission device. It can be a sparse planting transplanter.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  1 to 7 show an embodiment of the present invention. FIG. 1 is a side view of a transplanter, FIG. 2 is a development view of a planting power transmission system, and FIG. 3 is a diagram of an inconstant speed transmission device. FIG. 4 is a rear view of the inconstant speed transmission device, FIG. 5 is a front view of the inconstant speed transmission device, FIG. 6 is a side view showing a stationary orbit of the planting claw, and FIG. It is explanatory drawing which shows a running locus.

  As shown in FIG. 1, the transplanter 1 includes a traveling machine body 11 and a planting work machine 25, and the traveling machine body 11 is a pair of left and right front wheels 12 disposed via a front axle case (not shown). A vehicle body 16 supported by a pair of left and right rear wheels 15 disposed via a rear axle case 13, an engine (not shown) mounted on the front portion of the vehicle body 16 and covered with a bonnet 17, An elevating link mechanism 18 that is slidably disposed at the rear portion of the machine body 16 and that connects the working machine 25 to be movable up and down is disposed. A driver's seat 22 in which a seat 20, a steering handle 21, various operation levers, pedals, switches, and the like are disposed is disposed at the center of the body 16.

  The working machine 25 includes a planting frame 26 that is movably connected to the lifting link mechanism 18, a seedling base 27 that is slidably supported in the left-right direction above the planting frame 26, and the planting frame 26. An input case 28 attached to a substantially middle portion in the left-right direction, a plurality of planting transmission cases 30 attached to the planting frame 26 so as to extend rearward at a predetermined interval, and a rear end of the planting transmission case 30 And a plurality of planting devices 31 having a plurality of planting claws 31a, and a plurality of floats 32 supported below the planting transmission case 30 so as to be slidable in the vertical direction.

  The rotation of the engine is input to the transmission 35 via the HST 33 disposed on the lower side of the traveling machine body 11, and is branched into traveling power and planting power by the transmission 35. The traveling power is transmitted from the transmission 35 to the front wheels 12 through the front axle, and causes the traveling machine body 11 to travel. The planting power is transmitted from the transmission 35 to the input case 28 via the inconstant speed transmission device 36, the planting transmission shaft 37, and the PTO shaft 38 to drive the work machine 25.

  As shown in FIG. 2, the power transmission system of the transplanter 1 includes a traveling power transmission device 41, a planting power transmission device 51, and a working machine 25 that are branched in a mission case 35a. The planting part power transmission device 61 is configured to branch and transmit the power transmitted from the transmission device 51 to each planting device 31. The rotation of the engine is transmitted to an input shaft 33a of the HST 33 via a belt (not shown) and a pulley (not shown), continuously variable at the HST 33, and output from the output shaft 33b to the input shaft of the transmission 35. 42 is output.

  The traveling power transmission device 41 includes an intermediate shaft 43 disposed in the mission case 35 a so as to be rotatable in parallel with the input shaft 42, and a traveling power train disposed between the input shaft 42 and the intermediate shaft 43. A transmission 45, an intermediate shaft 46 that is rotatably arranged in the transmission case 35 a, a front wheel drive shaft 48 that drives the front wheels 12 via a differential mechanism 47, and a gear 50 that is fixed to the intermediate shaft 46. And a rear wheel drive system (not shown) for driving the rear wheel 15 to constitute a traveling transmission system.

  The planting power transmission device 51 includes an intermediate shaft 52 disposed in the mission case 35 a so as to be rotatable in parallel with the input shaft 42, and a planting power transmission device 51 disposed between the input shaft 42 and the intermediate shaft 52. The transmission 53 and the transmission case 35a are provided with an output shaft 55 disposed so as to be rotatable in a direction perpendicular to the intermediate shaft 52. Between the intermediate shaft 52 and the output shaft 55, a gear 52a and a gear 55a are provided. Are connected through.

  The planting part power transmission device 61 is rotatably supported by the input case 28, and is rotatably disposed in the planting frame 26, and an input shaft 28a connected to the PTO shaft 38 via the universal joint 40. A planting transmission shaft 62 that receives power transmission from the input shaft 28a, a planting drive shaft 63 that is rotatably supported at the rear end of the planting transmission case 30, and supports the planting device 31 at both ends thereof; It has a sprocket 65 fixed to the planting transmission shaft 62, a sprocket 66 fixed to the planting drive shaft 63, and a chain 67 spanned between the sprocket 65 and the sprocket 66.

  One end of the output shaft 55 is connected to the input shaft of the inconstant speed transmission device 36, and the output shaft of the inconstant speed transmission device 36 is connected to the input end of the planting transmission shaft 37, and the planting transmission shaft The output end of the PTO shaft 38 is connected to the input end of the PTO shaft 38 via a universal joint (not shown), and the output side end of the PTO shaft 38 is input to the input case 28 via the universal joint 40. The planting transmission system is configured by being connected to the shaft 28a.

  In the inconstant speed transmission device 36, a hollow protrusion 36a formed at the input side end portion of the case fits into a mounting hole 35b formed in the transmission case 35a of the transmission 35, and a plurality of bolts 36b is fixed to the mission case 35a.

  As shown in FIGS. 3, 4 and 5, the inconstant speed transmission device 36 is rotatably supported by a case 71 in which a mounting bolt hole 70 for inserting the bolt 36b is formed, so that the power transmission for planting is carried out. An input shaft 72 that is spline-fitted to an output-side end portion of the output shaft 55 of the device 51; an output shaft 73 that is rotatably supported by the case 71 on the same axis as the input shaft 72 at a predetermined interval; The case 71 includes an intermediate shaft 75 that is rotatably supported in parallel with the input shaft 72 and the output shaft 73 at a predetermined interval, and the inconstant speed transmission gear train 76 is provided between the input shaft 72 and the intermediate shaft 75. However, a constant speed transmission gear train 80 is disposed between the intermediate shaft 75 and the output shaft 73, and a brake mechanism 83 is disposed on the output shaft 73.

  The inconstant speed transmission gear train 76 meshes with the inconstant speed (eccentric) gear 77 fixed to one end of the input shaft 72 and the inconstant speed gear 77 at one end of the intermediate shaft 75. A fixed non-uniform speed (eccentric) gear 78 is included. The constant speed transmission gear train 80 includes a gear 81 fixed to the other end of the intermediate shaft 75 and a gear 82 fixed to one end of the output shaft 73 so as to mesh with the gear 81. Yes.

  The brake mechanism 83 includes a cam 85 fixed to the output shaft 73, a shaft 86 rotatably supported by the case 71, one end fixed to the shaft 86, and the other end the outer peripheral surface of the cam 85. And a biasing arm 88 fixed to the other end of the shaft 86, a bracket 90 fixed to the case 71, and a hole 88 a formed in the other end of the biasing arm 88. And a spring 92 attached to the bolt 91, and a double nut 93 that is screwed into the bolt 91 to adjust the resistance force of the spring 92. Therefore, the brake mechanism 83 adjusts the position of the cam arm 87 by adjusting the position of the double nut 93, and changes the contact pressure between the cam 85 and the cam arm 87 to adjust the braking force against the output shaft 73. be able to.

  With the above-described configuration, when engine rotation is input to the input shaft 33a of the HST 33, rotation output at a predetermined speed ratio is output from the output shaft 33b, and the input shaft 42 of the transmission 35 is rotated.

  The rotation of the input shaft 42 is transmitted to the intermediate shaft 43 through the transmission 45, and is transmitted from the intermediate shaft 43 to the differential mechanism 47 through the intermediate shaft 46, and from the differential mechanism 47 to the front wheel drive shaft 48, the front axle. It is transmitted to the front wheels 12 through the case, and is transmitted from the gear 50 to the rear wheel drive system, and is transmitted to the rear wheels 15 through the rear axle 13, thereby causing the traveling machine body 11 to travel.

  The rotation transmitted from the input shaft 42 to the output shaft 55 through the intermediate shaft 52, the gear 52a, and the gear 55a through the transmission 53 is transmitted to the input shaft 72 of the inconstant speed transmission device 36. The rotation of the input shaft 72 is transmitted to the intermediate shaft 75 through the inconstant speed gear 77 and the inconstant speed gear 78 constituting the inconstant speed transmission gear train 76, and is transmitted to the intermediate shaft 75. It is transmitted to the output shaft 73 via the gear 81 and the gear 82 constituting the row 80.

  Here, when the rotation of the intermediate shaft 75 shifts from the high speed region to the low speed region due to the rotation of the inconstant speed transmission gear train 76, the inertia rotation (inertial force) of the planting transmission system after the output shaft 73 is applied to the output shaft 73. The fixed gear 82 acts so as to perform a preceding rotation (advance movement) with respect to the gear 81 fixed to the intermediate shaft 75 by the amount of backlash.

  At this time, the cam arm 87 is brought into contact with the cam 85 of the brake mechanism 83 to suppress the rotation of the cam 85, so that the braking force is applied to the output shaft 73, and the preceding movement of the gear 82 with respect to the gear 81 can be eliminated.

  The inconstant speed rotation output from the output shaft 73 is transmitted to the input shaft 28a of the input case 28 via the planting transmission shaft 37, the universal joint, the PTO shaft 38, and the universal joint 40, and the planting transmission is transmitted from the input shaft 28a. It is transmitted to the planting device 31 via the shaft 62, the chain 67, and the planting drive shaft 63, and drives the planting device 31. Accordingly, the planting device 31 rotates at a non-uniform speed.

  The rotational speed of the planting device 31 driven as described above includes two speed-up zones and a slow-down zone during one rotation. The relationship between the acceleration / deceleration of the planting device 31 and the braking force generated by the brake mechanism 81 is as shown in FIG. 6 on the stationary locus of the planting claw 31a.

  In FIG. 6, during one rotation of one planting claw 31a, two speed increase areas (solid arrow areas) A and C and speed reduction areas B and D are generated. That is, the scraping area of the seedling N from the mat seedling M of each planting claw 31a and the planting (movement in the soil) area of the seedling N are accelerated, and the area where the planting claw 31a is idle and the scraped seedling The area carrying N toward the field is decelerated.

  Further, in each speed increasing area A, C, there are two fastest positions E, F shifted by approximately 180 degrees, and in each deceleration area B, D, two slowest positions G, H shifted by approximately 180 degrees. Exists. The one fastest position E is set so that the planting claw 31a is immediately after (in the soil) the seedling N is separated from the seedling N in the field, and the other fastest position F is the planting claw 31a from the mat seedling M. It is set to match immediately after the seedling N is scraped off.

  Immediately after the planting claw 31a passes the fastest position F, the braking start position I is set, the braking force maximum position J is set before the slowest position G, and the planting claw 31a is controlled to a position where it enters the surface T. A power release start position K is set, and a braking force release end position L is set before the fastest position E. Further, the braking start position I, the braking force maximum position J, the braking force release start position K, and the braking force release end position L are shifted by about 180 degrees, respectively. R and braking force release end position S are set.

  With the above setting, the running locus of the planting claw 31a of the planting device 31 is as shown in FIG. The running locus X of the planting claw 31a according to the present invention has the fastest moving speed of the planting claw 31a in the soil as compared with the running locus Y of the conventional planting claw 31a. The amount of movement is reduced, and the drag amount of the seedling in the soil can be reduced. Moreover, since the raising speed | rate of the planting nail | claw 31a becomes large, interference with the planted seedling can be avoided.

  As described above, the planting power transmission device 51 arranged on the upstream side of the transmission branched to each planting device 31 is braked against the preceding movement due to the inertia of the planting device 31 caused by the inconstant speed transmission gear train 76. Therefore, one brake device 83 is sufficient regardless of the number of planting devices 31 and planted compared to the conventional plant in which a brake mechanism is provided on the planting drive shaft of each planting device. The configuration of the transmission system can be simplified.

  Further, the input shaft 72 can be easily assembled to the output shaft 55 by fitting the inconstant speed transmission device 36 to the transmission case 35a of the transmission 35.

  Further, since the inconstant speed transmission gear train 76 and the brake mechanism 83 are interposed in the planting transmission device as a single unit, the inconstant speed transmission device 36, which is the unit, is deployed by slightly improving the existing model. be able to.

  FIG. 8 is a development view of the inconstant speed / deceleration transmission device showing another embodiment of the present invention. In this embodiment, an inconstant speed / deceleration transmission device 101 is arranged in place of the inconstant speed transmission device 36 in the above embodiment, and the others are the same as in the above embodiment. The same reference numerals as those in FIG.

  The inconstant speed / deceleration transmission device 101 is rotatably supported by the case 71, and an input shaft 72 that is spline-fitted with an output side end portion of the output shaft 55 of the planting power transmission device 51, and a case 71 An output shaft 73 that is rotatably supported at a predetermined interval on the same axis as the input shaft 72, and a case 71 that is rotatably supported in parallel with the input shaft 72 and the output shaft 73 at a predetermined interval. An intermediate shaft 75, a reduction transmission gear train 102 between the input shaft 72 and the intermediate shaft 75, and an inconstant speed transmission gear train 76 between the intermediate shaft 75 and the output shaft 73. Each brake mechanism 83 is arranged. The reduction transmission gear train 102 includes a small-diameter gear 103 fixed to the input shaft 72 and a large-diameter gear 105 fixed to the intermediate shaft 75.

  In the above-described configuration, the rotation transmitted from the output shaft 55 to the input shaft 72 is decelerated by the reduction gear train 102 and then converted to non-uniform rotation by the non-constant speed transmission gear train 76 to be planted from the output shaft 73. Output to the shaft 37. Even with this configuration, it is possible to obtain the same effects as those of the above-described embodiment.

  In addition, since the inconstant speed transmission gear train 76, the reduction transmission gear train 102 and the brake mechanism 83 are interposed in the planting transmission device 51 as a single unit, it can be easily sparsely planted by simply remodeling the existing model. Can be a transplanter.

It is a side view of a transplant machine. It is an expanded view of a planting power transmission system. It is an expanded view of an inconstant speed transmission device. It is a rear view of an inconstant speed transmission device. It is a front view of an inconstant speed transmission device. It is a side view which shows the stationary track | orbit of a planting nail | claw. It is explanatory drawing which shows the running locus | trajectory of a planting nail. It is a development view of an inconstant speed / deceleration transmission device.

Explanation of symbols

1 transplanter 12 traveling wheel (front wheel)
15 Traveling wheel (rear wheel)
31 planting device 36 inconstant speed transmission device 41 traveling power transmission device 51 planting power transmission device 76 inconstant speed transmission gear train 83 brake mechanism 101 inconstant speed / deceleration transmission device 102 deceleration transmission gear train

Claims (3)

Rotation from the engine is transmitted to the planting power transmission device, and then the planting transmission system for branching from the power transmission device to each planting device for transmission, and rotation from the engine to the traveling wheels via the traveling power transmission device In a transplant machine comprising a traveling transmission system for transmitting,
The planting power transmission device includes an inconstant speed transmission gear train, and a brake mechanism that periodically applies a braking force during one rotation of the planting device and releases the braking force.
A transplanter characterized by that. The planting power transmission device is provided with an inconstant speed transmission device having the inconstant speed transmission gear train and the brake mechanism.
The transplanter according to claim 1. The planting power transmission device is provided with an inconstant speed / deceleration transmission device having the inconstant speed transmission gear train, a reduction transmission gear train, and the brake mechanism.
The transplanter according to claim 1.

Images