JP2013192458A - Rice transplanter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To correct troubles such as twisting and the like of transmission elements caused by functionating non-uniform speed members in a rice transplanter having a rotary type seedling planting device.SOLUTION: Non-uniform speed members 48, 56, 121, 122, 98, 99 transmitting non-uniform rotational power to a transplanting mechanism 8 are installed by separating the same into upstream non-uniform speed members 48, 56, 121, 122 on the inter-row spacing speed-changing device 26 side and downstream non-uniform speed members 98, 99 on the seedling planting device side. The upstream non-uniform speed members 48, 56, 121, 122 are switchable between multiple gears and the acceleration/deceleration ratios for each gear are brought to be different, and the downstream non-uniform speed members 98, 99 are formed in a single gear. In each of the gears for the upstream non-uniform speed members 48, 56, 121, 122, the maximum speed phase, where the operating speed of planting claws 96 in the transplanting mechanism 8 is at the maximum speed, is brought to be changeable in a longitudinal range with the bottom dead center as a center.

Description

  The present invention relates to a rice transplanter in which a seedling planting apparatus having a seedling platform and a plurality of planting claws is attached to a traveling machine body and a seedling planting operation is continuously performed.

  In a conventional rice transplanter, a seedling planting apparatus having a seedling stage and a transplanting mechanism with planting claws is mounted on the rear part of the traveling machine body. As a transplanting mechanism of a seedling planting apparatus, a type in which two planting claws are provided in one rotary case is common. When the rotary case rotates once, the two planting claws are opposite to the rotary case. Make one turn in the direction. That is, the planting claw rotates while revolving around the axis of the rotary case.

  In seedling planting work using this type of rice transplanter, planting claws facing the direction of the front seedling platform are made while intermittently feeding the seedling platform on which the seedling mat is placed to the left and right at regular intervals. By revolving around the axis of the rotary case, the planting claws are reciprocated between the seedling stage and the field scene, and the seedlings are scraped one by one from the seedling mat and planted in the field. The operation period (planting period) of the planting claws in the seedling planting apparatus is linked to the traveling speed of the traveling machine body, and the seedling planting interval (between plants) is kept constant even if the traveling speed changes.

  The number of seedlings to be planted per unit area (generally 3.3 square meters) is not necessarily constant. For example, the desired number of plants to be planted per unit area varies depending on the region or the user. In this regard, the conventional rice transplanter is provided with an inter-strain transmission that adjusts the interlocking relationship between the traveling speed and the planting cycle. In this case, by changing the operating speed (planting speed) of the transplanting mechanism with respect to the traveling speed by the inter-strain transmission, the inter-strain is changed and the number of planted strains per unit area is changed.

  In recent years, taking into consideration the growth conditions of seedlings planted in the field, sparse planting has been carried out in which the plant spacing is longer than that of standard planting. However, the planting speed needs to be slowed as the plant strain increases. However, if the planting speed is simply slowed down by the inter-strain transmission, there is a problem that the planting claw tip is dragged in the field and the seedling falls forward or a floating seedling is generated.

  In this regard, Patent Documents 1 and 2 describe a rice transplanter equipped with an inconstant speed member that transmits inconstant speed rotational power to the transplant mechanism in order to prevent the planting claws from being dragged in the field during sparse planting. A structure is disclosed. The inconstant speed member is configured to change the angular speed during one rotation of the rotary case constituting the transplantation mechanism (inconstant speed rotation), and increase the speed at which the planting claws escape from the field even during sparse planting. Yes. In the rice transplanter of Patent Document 1, an inconstant speed member is incorporated in the inter-strain transmission in the mission case. In the rice transplanter of Patent Document 2, an inconstant velocity member is provided on the downstream side of power transmission with respect to the lateral feed drive mechanism of the seedling stage.

Japanese Patent No. 4376154 JP 2003-189712 A

  Now, the power transmission system from the inter-strain transmission to the transplanting mechanism is composed of transmission elements such as gears and rotating shafts. A transmission element such as a rotating shaft is not a perfect rigid body, and is slightly elastically deformed when a load (rotational torque) is applied, and returns and deforms with an elastic restoring force when the load is released. That is, in the transmission element of the power transmission system, torsion and torsion release occur alternately with rotation, and this appears as vibration. On the other hand, the inconstant velocity member accelerates and decelerates the angular velocity during one rotation of the transmission element, and the load fluctuation acting on the transmission element is further increased by the acceleration and deceleration. For this reason, in the configuration in which the inconstant speed member functions at the time of sparse planting as in the above prior art, the vibration of the transmission element appears remarkably, and the operation period of the planting claw is shifted, resulting in poor planting. was there. Such a tendency appears more prominently as the traveling speed of the traveling vehicle increases.

  This invention is made | formed in view of the above present conditions, and is trying to prevent the malfunction, enjoying the advantage of an inconstant speed member.

  The present invention includes various configurations. The invention of claim 1 has the highest concept, and the rice transplanter according to the invention has a transmission case for shifting the power from the engine mounted on the traveling machine body, and a planting claw for drawing a non-circular motion locus. A seedling planting apparatus having a transplanting mechanism and an inter-strain transmission device that changes the operating speed of the transplanting mechanism with respect to the traveling speed of the traveling machine body to change between the strains. An inconstant speed member that transmits the inconstant speed rotational power to the transplanting mechanism is divided into an upstream inconstant speed member on the inter-gear transmission side and a downstream inconstant speed member on the seedling planting apparatus side. ing. The upstream inconstant speed member can be switched to a plurality of stages, and the acceleration / deceleration ratios of the respective stages are made different, and the downstream inconstant speed member is configured in a single stage. In each stage of the upstream inconstant velocity member, the maximum speed phase at which the operation speed of the planting claw in the transplanting mechanism is maximum can be set and changed in a range before and after the bottom dead center.

  In the invention of claim 2, the downstream inconstant velocity member can change the setting of the highest speed phase in a direction further away from the bottom dead center.

  The invention of claim 3 is a preferred development of the invention of claim 1. In the present invention, the inter-stock transmission is provided on the traveling machine body side.

  There are various power transmission system transmission elements such as gears, rotating shafts, clutches, sprockets, and chains. There are various gears such as a bevel gear and a planetary gear as well as a flat gear. Conventionally, a flat gear is configured as an inconstant speed gear as an inconstant speed member. On the other hand, in the invention of claim 4, as the downstream inconstant velocity member, the bevel gear pair is configured as an inconstant velocity gear. That is, in claim 4, the power transmission system from the inter-strain transmission to the transplanting mechanism has rotating shafts intersecting each other, and is configured to transmit power to the intersecting rotating shafts via a bevel gear pair. The bevel gear pair is configured as an inconstant speed gear as the downstream inconstant speed member.

  An inconstant speed gear is also arranged inside the rotary case constituting the transplanting mechanism, which operates the planting claw so as to draw a long non-circular motion trajectory up and down. This is different from an inconstant speed member (that is, a member that imparts inconstant speed rotation (acceleration / deceleration) to a transmission element of a power transmission system).

  According to the present invention, a transmission case for shifting power from an engine mounted on a traveling machine body, a seedling planting device having a transplanting mechanism with a planting claw for drawing a non-circular movement locus, and the traveling speed of the traveling machine body In a rice transplanter provided with an inter-strain transmission that changes the operating speed of the transplanting mechanism to change between stocks, an inconstant speed member that transmits inconstant speed rotational power to the transplanting mechanism is provided on the upstream side on the inter-strain transmission side. It is divided into a constant speed member and a downstream inconstant speed member on the seedling planting device side, and the upstream inconstant speed member can be switched to a plurality of stages and the acceleration / deceleration ratio of each stage is made different. And since the said downstream inconstant speed member is comprised by the single stage, it can suppress that a load concentrates on a specific transmission element, and can suppress the twist of a power transmission system. As a result, planting defects can be prevented or suppressed.

  In addition, since there are fewer parts that rotate at a non-uniform speed than before, excessive torque is prevented from being generated in the power transmission system, and the operation cycle deviation of the planting claw due to backlash in the power transmission system is prevented. Or it can be suppressed. As described above, in general, it is necessary to rotate the power transmission system at a non-uniform speed during sparse planting. Therefore, it is preferable to rotate at an inconstant speed in conjunction with switching the inter-strain transmission to the sparse planting setting.

  Further, in each stage of the upstream inconstant speed member, the maximum speed phase at which the operation speed of the planting claw in the transplanting mechanism is the highest can be set and changed in a range before and after the bottom dead center. For example, when the twist of the power transmission system is large due to the relationship with the assembling accuracy, etc., there is a concern about deviation of the operation cycle of the planting claw, or the power transmission system is small torsion and suppresses vibration of the power transmission system If desired, the highest speed phase can be set around the bottom dead center. That is, for example, it is possible to change the setting of the highest speed phase before and after the bottom dead center according to the relationship with the assembling accuracy, etc., so that the planting claw can draw an optimum motion locus. Accordingly, regardless of whether the planting claw is densely planted or densely planted, the operation speed of the planting claw is increased in the vicinity of the bottom dead center, and the planting claw can be accurately and quickly released from the bottom dead center. As a result, seedlings can be planted in an appropriate planting posture.

  According to the invention of claim 2, the downstream inconstant velocity member can change the setting of the highest speed phase in a direction further away from the bottom dead center, so that the effect of claim 1, that is, the operation of the planting claw By speeding up near the bottom dead center, the effect of allowing the planting claw to escape from the bottom dead center accurately and quickly can be further promoted.

  By the way, although it is theoretically possible to attach the inter-strain transmission to the seedling planting device, it is advantageous to make the seedling planting device as light as possible. Therefore, it is preferable that the inter-train transmission is provided in the traveling machine body as described in claim 3. Also, in recent rice transplanters, fertilizer is often provided on the traveling machine, but since the fertilizer must be interlocked with the movement of the seedling planting device, in this case, a strain change device is provided on the traveling machine, The power is transmitted from the inter-strain change device to the fertilizer application device and the planting unit. In any case, it is preferable that the inter-company transmission is provided on the traveling machine body.

It is a top view of the rice transplanter concerning an embodiment. It is a side view of a rice transplanter. It is a perspective view which shows the framework of a rice transplanter. (A) is a perspective view which shows the whole power transmission path | route, (B) is a perspective view of a seedling planting apparatus. (A) is a side view of a power transmission path, (B) is a side view of a place of a seedling planting device, and (C) is a diagram showing a locus of a planting claw. (A) is a top view which shows a power transmission path | route, (B) is an external appearance perspective view of a stock change apparatus, (C) and (D) are external appearance perspective views of the center case provided in the planting part. (A) is an external perspective view of the gear group in the stock change apparatus and the center case, (B) is a perspective view of the gear group in the center case, and (C) is a rear view of the gear group in the center case. It is a transmission system diagram. (A) is a top view which shows the power transmission path | route to a seedling planting apparatus, (B) is the isolation | separation top view of the terminal planting part of a power transmission path | route, (C) is the schematic of a bevel gear. (A) And (B) is a top view which shows the meshing state of a bevel gear, (C) (D) is a perspective view of a bevel gear, (E) is a contrast figure which arranged the pair of bevel gears. It is a graph which shows the relationship between the combination of the gear in an inter-strain transmission, and the number of planting stocks. It is a figure which shows the movement locus | trajectory of the planting nail | claw at the time of setting to 43 stocks of inconstant speed. It is a figure which shows the angular velocity change of the planting nail | claw at the time of setting to 43 strains of unequal speed.

  Next, embodiments of the present invention will be described with reference to the drawings. The embodiment is applied to a riding type rice transplanter (hereinafter simply referred to as “rice transplanter”). In the following description, the front / rear / left / right wording is used to specify the direction, but the front / rear / left / right wording defines the forward direction of the rice transplanter as the front. The front view direction is opposite to the forward direction.

(1). First, an outline of a rice transplanter will be described with reference to FIGS. As shown in FIGS. 1-3, the rice transplanter has the traveling body 1 and the seedling planting apparatus 2 arrange | positioned behind it. The traveling machine body 1 has front and rear wheels 3, 4, a control seat 5, and a control handle 6, while the seedling planting device 2 has a seedling mounting base 7 and a transplanting mechanism 8 on which a seedling mat is placed. The rice transplanter of the embodiment is an eight-row planting type. For this reason, eight seedling mat placement areas are formed on the seedling placing stand 7, and eight transplanting mechanisms are provided at the rear portion of the seedling planting device 2. 8 are arranged in a horizontal row.

  As shown in FIG. 3, the traveling machine body 1 has a frame 9 made of a large number of frame members, and an engine 10 is supported by the front portion of the frame 9. A mission case 11 is disposed behind the engine 10. As clearly shown in FIG. 4A, a hydrostatic continuously variable transmission (HST) 12 is mounted on the left side surface of the mission case 11, and the power of the engine 10 is hydrostatically continuously variable by a belt 13. Is transmitted to the machine (HST) 12. The engine 10 is covered with a hood 14. Further, a portion of the traveling machine body 1 excluding the hood 14 is covered with a vehicle body cover 15.

  A front axle device 17 is attached to the left and right side surfaces of the mission case 11, and the front wheel 3 is attached to the front axle device 17. A rear axle case 18 is disposed behind the transmission case 11, and the rear wheel 4 is attached to a rear axle that protrudes laterally from the rear axle case 18. The transmission case 11 and the rear axle case 18 are connected to each other by a longitudinal joint material 19. Two rear struts 20 are attached to the rear axle case 18, and the upper end of the rear strut 20 is fixed to a laterally long rear frame 9 a (see FIG. 3) that constitutes the rear end portion of the frame 9. .

  A link device 21 composed of upper and lower link bodies (top link and lower link) is rotatably connected to the left and right rear columns 20, and a seedling planting device 2 is attached to the rear end of the link device 21. . The link device 21 can be rotated by a hydraulic cylinder (elevating cylinder) 22 connected to the joint material 19. Therefore, the seedling planting device 2 moves up and down by expanding and contracting the hydraulic cylinder 22.

  As can be easily understood from FIG. 4, power is transmitted from the inside of the transmission case 11 to the inside of the rear axle case 18 by the rear wheel drive shaft 23. The rotation of the rear wheel drive shaft 23 is transmitted to the rear wheel 4 through a gear group provided on the rear axle case 18. The rice transplanter of the embodiment is provided with a leveling rotor 24 in the seedling planting device 2, and power is transmitted to the leveling rotor 24 by a rotor drive shaft 25 that protrudes backward from the rear axle case 18.

  In the embodiment, a stock transmission 26 is attached to the right side portion of the rear axle case 18, and power is transmitted from the transmission case 11 to the stock transmission 26 via a planting power transmission shaft 27. The rotation of the planting power transmission shaft 27 is shifted by a gear group incorporated in the inter-strain transmission 26 and transmitted to the seedling planting device 2 by the PTO shaft 29.

  The seedling planting apparatus 2 has a horizontally long main frame 28, and a center case 30 is fixed to a substantially right and left intermediate portion of the main frame 28, and the power of the PTO shaft 29 is a gear built in the center case 30. Transmitted to the group. Four support arms 31 extending rearward are fixed to the rear surface of the main frame 28, and a pair of right and left transplant mechanisms 8 are rotatably attached to the rear end portion of the support arm 31.

  A laterally long planting drive shaft 32 passes through the base end portion (a portion near the front end) of the support arm 31, and the transplanting mechanism 8 is driven by the rotation of the planting drive shaft 32 (details will be described later). . Further, power is transmitted from the PTO shaft 29 to the planting drive shaft 32 via a gear group built in the center case 30. The center case 30 is also provided with a laterally long lateral feed shaft 33, and the seedling stage 7 moves laterally by one pitch by the rotation of the lateral feed shaft 33.

  The seedling planting apparatus 2 has a group of belts 34 on which a seedling mat is placed, and the belts 34 are wound around a pair of upper and lower vertical feed shafts 35. When the seedling stage 7 has moved all the way to the left and right, the vertical feed support shaft 35 rotates and the seedling mat moves downward by one pitch.

  As shown in FIG. 4B, each transplantation mechanism 8 has one rotary case 36 and a planting claw member 37 that is rotatably provided at both ends thereof, and the rotary case 36 is rotated by half. Each time the seedling claw member 37 scrapes off the seedling and plantes it. Further, the rotary case 36 is set to rotate 1/2 when the PTO shaft 29 rotates once. The rotational speed of the PTO shaft 29 is basically proportional to the traveling speed of the traveling machine body 1, but by changing the relationship between the traveling speed and the rotational speed of the PTO shaft 29 by the stock transmission 26, seedling planting The interval (between stocks) can be changed.

(2). Inter-strain transmission structure / power transmission structure (upstream non-constant member)
Details of the power transmission system from the inter-strain transmission 26 to the transplanting mechanism 8 will be described below. First, the structure of the inter-strain transmission 26 and the power transmission structure corresponding thereto will be described mainly with reference to FIGS. The stock transmission 26 has a front-to-back split stock case 40 shown in FIG. 4B, and a gear group as shown in FIGS. 6A and 6C is arranged therein. .

  An input shaft 41 and an output shaft 42 are arranged inside the stock case 40, and the rear end of the planting power transmission shaft 27 is connected to the input shaft 41 via a universal joint. A first gear 43 and a second gear 44 having the same diameter are fixed to the input shaft 41. Although both gears 43 and 44 have the same diameter, the number of teeth of the second gear 44 is slightly smaller than that of the first gear 43.

  The input shaft 41 and the output shaft 42 are arranged concentrically. A cylindrical intermediate shaft 45 is fitted to the input shaft 41 so as to be relatively rotatable, and the intermediate shaft 45 is fitted in a state of rotating together with the output shaft 42 (a state in which relative rotation is impossible). A third gear 46 and a fourth gear 47 are slidably fitted on the intermediate shaft 45 by spline fitting or the like so as not to rotate relative to each other. Further, the upstream inconstant speed first gear 48 and the upstream inconstant speed third gear 121 are fitted to the intermediate shaft 45 so as to be relatively rotatable.

  A cam-type main clutch 49 is provided on the output shaft 42. The main clutch 49 includes a fixed part 49a and a slide part 49b. The slide part 49b is urged toward the fixed part 49a by a clutch spring 49c (see FIG. 7C). When the slide part 49b moves away from the fixed part 49a against the clutch spring 49c, power transmission from the input shaft 41 to the output shaft 42 is cut off. The main clutch 49 is disengaged when the seedling planting device 2 is being lifted, such as when traveling on the road or turning. The disengagement operation of the main clutch 49 is performed by lowering the main clutch operation shaft 50.

  An idle shaft 51 extending in parallel with the input shaft 41 and the output shaft 42 in a side view is rotatably supported inside the inter-case case 40, and the idle gear 51 is supported by the first gear 43 or the second gear 44. The fifth gear 52 that can mesh with each other is fitted so as to be slidable and relatively non-rotatable by spline fitting or the like. The fifth gear 52 has about twice as many teeth as the first gear 43 or the second gear 44, and a first position meshed with the first gear 43 and a second position meshed with the second gear 44 can be selected. .

  The idle shaft 51 meshes with the upstream inconstant speed fourth gear 122 that always meshes with the upstream inconstant speed third gear 121, the sixth gear 54 that meshes with and away from the third gear 46, and the fourth gear 47. The seventh gear 55 that separates and the upstream unequal speed second gear 56 that is always meshed with the upstream unequal speed first gear 48 are fixed. The ratio of the number of teeth of the seventh gear 55 to the fourth gear 47 is set to be smaller than the ratio of the sixth gear 54 to the third gear 46. Accordingly, the rotational speed of the intermediate shaft 45 (and the output shaft 42) is higher when the fourth gear 47 and the seventh gear 55 are engaged than when the third gear 46 and the sixth gear 54 are engaged. Is lower.

  The upstream inconstant speed first gear 48 and the upstream inconstant speed second gear 56 are non-circular profiles such as ellipses, and the number of teeth is set to be the same. Therefore, in a state where the rotation of the idle shaft 51 is transmitted to the intermediate shaft 45 and the output shaft 42 via both the inconstant speed gears 48 and 56, the rotational speeds of the idle shaft 51 and the output shaft 42 are the same, and The output shaft 42 rotates in a state where the angular velocity is periodically changed during one rotation. The two inconstant speed gears 48 and 56 are non-circular and are always kept in meshing because of the particularity that the phase of meshing is always determined. Similarly, the upstream inconstant speed third gear 121 and the upstream inconstant speed fourth gear 122 have non-circular profiles such as ellipses, and the number of teeth is set to be the same. Therefore, in a state where the rotation of the idle shaft 51 is transmitted to the intermediate shaft 45 and the output shaft 42 via both the inconstant speed gears 48 and 56, the rotational speeds of the idle shaft 51 and the output shaft 42 are the same, and The output shaft 42 rotates in a state where the angular velocity is periodically changed during one rotation. That is, the upstream inconstant speed first gear 48 and the upstream inconstant speed second gear 56 are non-circular gear pairs such as eccentric gears, and have a large acceleration / deceleration ratio (inconstant speed ratio). The upstream inconstant speed third gear 121 and the upstream inconstant speed fourth gear 122 are also non-circular gear pairs such as eccentric gears, but have a small acceleration / deceleration ratio (inconstant speed ratio).

  Here, in the rotary case 36, for example, at the time of sparse planting of 37 strains / square m, the highest speed phase of each planting claw 96 in the planting claw member 37 (the phase at which the operation speed of the planting claw 96 becomes the highest speed) Acceleration / deceleration is provided so as to be near the bottom dead center, but in the embodiment, the upstream inconstant speed first gear 48 and the upstream inconstant speed second gear 56 provided in the inter-variety transmission 26 are used. A slightly larger acceleration / deceleration is applied to the rotational power from the stock case 40 to output the inconstant rotational power. Therefore, since the acceleration / deceleration ratio (unequal speed ratio) is larger than the combination of the upstream inconstant speed third gear 121 and the upstream inconstant speed fourth gear 122, the bottom of the operating locus of the planting claw 96 is near the bottom dead center. The operating speed of the is greatly increased. Further, the upstream inconstant speed third gear 121 and the upstream inconstant speed fourth gear 122 give slightly smaller acceleration / deceleration to the rotational power from the stock case 40 to output the inconstant rotational power. Accordingly, since the acceleration / deceleration ratio (the non-uniform speed ratio) is smaller than the combination of the upstream non-constant speed first gear 48 and the upstream non-constant speed second gear 56, the bottom of the operating locus of the planting claw 96 is near the bottom dead center. Increase the operating speed of. The upstream inconstant speed first to fourth gears 48, 56, 121, and 122 correspond to upstream inconstant speed members on the inter-strain transmission 26 side that transmit the inconstant speed rotational power to the transplantation mechanism 8.

  The fourth gear 47 and the upstream inconstant speed first gear 48 are provided with a first intermediate clutch 57 that can be engaged and separated. When the fourth gear 47 slides further to the right from the state of FIG. 8 once engaged with the seventh gear 55, the first intermediate clutch 57 is engaged. In a state where the first intermediate clutch 57 is engaged, the power of the idle shaft 51 is transmitted to the output shaft 42 via the upstream inconstant speed second gear 56 and the upstream inconstant speed first gear 48. In a state where the first intermediate clutch 57 is engaged, the third gear 46 and the fourth gear 47 are idling. Accordingly, the first intermediate clutch 57 serves to disconnect the connection between the intermediate shaft 45 and the upstream inconstant speed first gear 48.

  The third gear 46 and the upstream inconstant speed third gear 121 are also provided with a second intermediate clutch 123 that can be engaged and separated. When the third gear 46 slides further leftward from the state shown in FIG. 8 once engaged with the sixth gear 54, the second intermediate clutch 123 is engaged with the intermediate shaft 45. In a state where the second intermediate clutch 123 is engaged, the power of the idle shaft 51 is transmitted to the output shaft 42 via the upstream inconstant speed fourth gear 122 and the upstream inconstant speed third gear 121. In this case as well, if the second intermediate clutch 123 is engaged, the third gear 46 and the fourth gear 47 idle. Accordingly, the second intermediate clutch 123 serves to disconnect the connection between the intermediate shaft 45 and the upstream inconstant speed third gear 121.

  When the fifth gear 52 slides, switching in two stages is performed, and when the intermediate shaft 45 slides, switching in four stages is performed. Therefore, there are eight combinations (speed switching) as a whole. For example, the number of shares per 3.3 square meters can be changed to 37 to 85 shares, which covers almost all areas of sparse and dense planting. FIG. 11 shows the relationship between the combination of gears and the number of planted stocks in the embodiment. In the case where the first gear 43 and the fifth gear 52 are engaged with each other, if the fourth gear 47 and the seventh gear 55 are engaged, the number of planted stocks is set to the constant strain d, and the third gear 46 and the sixth gear 52 are combined. If the gear 54 is meshed, the number of planted stocks is set to a constant-speed f strain. If the second intermediate clutch 123 is engaged, the number of planted stocks is set to b strains with unequal speed. When the second gear 44 and the fifth gear 52 are meshed with each other, if the fourth gear 47 and the seventh gear 55 are meshed, the number of planted strains is set to a constant c strain, and the third gear 46 and the sixth gear 52 are coupled. If the gear 54 is meshed, the number of planted stocks is set to a constant speed e strain. If the first intermediate clutch 57 is engaged, the number of planted strains is set to a strain having an unequal speed. In this case, the number of stocks indicated in alphabets has a large relationship in alphabetical order.

  Here, the upstream inconstant speed first to fourth gears 48, 56, 121, 122 are assembled to the intermediate shaft 45 and the idle shaft 51 by adjusting the mounting phase, and thereby the operation of the planting claw 96 in the transplanting mechanism 8. The fastest phase at which the speed is the fastest can be changed within the range before and after the bottom dead center. FIG. 12 shows, as an example, an operation locus of the planting claw 96 when 43 strains are set at unequal speed. The reference symbol MS1 in FIG. 12 indicates that the upstream inconstant speed third gear 121 and the upstream inconstant speed fourth gear 122 are set so that the operating speed of the planting claw 96 becomes the highest speed on the front side (upstream side) from the bottom dead center. MS2 is the highest speed phase when assembled, and MS2 is the upstream inconstant speed third gear 121 and the upstream inconstant speed fourth gear 122 so that the operating speed of the planting claw 96 becomes the fastest near the bottom dead center. Is the fastest phase when. The symbol MS3 is assembled with the upstream non-constant speed third gear 121 and the upstream non-constant speed fourth gear 122 so that the operation speed of the planting claw 96 is the highest after the bottom dead center (downstream side). Is the fastest phase.

  Depending on the relationship with the assembling accuracy, for example, the upstream inconstant speed third gear 121 and the upstream inconstant speed fourth gear 122 are assembled so that the front side (upstream side) from the bottom dead center is the highest speed phase MS1. The upstream inconstant speed third gear 121 and the upstream inconstant speed fourth gear 122 are assembled so that the vicinity of the bottom dead center is the highest speed phase MS2, and further, the rear side (downstream side) from the bottom dead center is the highest speed. It is possible to assemble the upstream inconstant speed third gear 121 and the upstream inconstant speed fourth gear 122 so as to be in the phase MS3. That is, for example, when the twist of the power transmission system is large due to the relationship with the assembling accuracy and the operation period of the planting claw 96 is concerned, or when the twist of the power transmission system is small and the vibration of the power transmission system is minimized. Even if you want to suppress it, you can change the setting of the fastest phase around the bottom dead center. If it does so, the shakiness of the planting nail | claw 96 can be suppressed or the vibration of a power transmission system can be suppressed. Needless to say, the upstream inconstant speed first gear 48 and the upstream inconstant speed second gear 56 may be assembled to the intermediate shaft 45 or the idle shaft 51 by adjusting the mounting phase.

  A fertilizer rotation shaft 58 extending in parallel with the input shaft 41 and the output shaft 42 is rotatably disposed on the upper portion of the inter-case case 40, and the fertilizer rotation shaft 58 is engaged with the first gear 43. A gear 59 is fitted so as to be relatively rotatable. Power is transmitted from the fertilizer rotating shaft 58 to the fertilizer driving shaft 62 via the bevel gear 61.

  As shown in FIG. 7 (A), the inter-stock transmission 26 has two operation shafts, a first operation shaft 63 and a second operation shaft 64. These operation shafts 63 and 64 have a longitudinal and longitudinal posture, and are exposed in front of the inter-case case 40. As can be understood from FIG. 6B, the first operation shaft 63 can be slid back and forth with the first lever 65, and the second operation shaft 64 can be slid back and forth with the second lever 66. The first operating shaft 63 is for sliding the fifth gear 52 and has a shifter for sliding the fifth gear 52. The second operating shaft 64 is for sliding the intermediate shaft 45 and includes a shifter that engages with the intermediate shaft 45.

(3). Next, the internal structure of the center case 30 (that is, the planting part transmission) will be described with reference to FIGS. The center case 30 is formed of a left and right split type shell body, and a longitudinal input shaft 69 is rotatably held. The front end of the input shaft 69 and the rear end of the PTO shaft 29 are connected via a universal joint.

  A left and right longitudinal intermediate shaft 70 is disposed inside the center case 30, and the rotation of the input shaft 69 is transmitted to the intermediate shaft 70 by a pair of first bevel gears 71a and 71b. Inside the center case 30, a lateral feed drive shaft 72 is disposed in a horizontally long posture, and the lateral feed shaft 33 is connected to the lateral feed drive shaft 72.

  Three transverse feed adjustment driven gears 73 are fixed to the transverse feed drive shaft 72, while three transverse feed adjustment adjustable drive gears corresponding to the transverse feed adjustment driven gear 73 are fixed to the intermediate shaft 70. 74 is loosely fitted. Power is selectively transmitted from the intermediate shaft 70 to only one of the three lateral feed amount adjusting main driving gears 74 by a slide key 76 (see FIG. 8). The slide key 76 is slid by a slide lever 77 shown in FIGS. 6C, 6D, 7A, and 7B.

  The ratio of the number of teeth of the pair of the lateral feed amount adjusting gears 73 and 74 is different, and when the combination of the lateral feed amount adjusting gears 73 and 74 is changed, the rotation ratio of the lateral feed drive shaft 72 to the PTO shaft 29 is changed. . As a result, the lateral feed pitch of the seedling stage 7 changes and the amount of seedling scraping changes.

  The center case 30 has a projecting portion 30a extending rearward and downward, and a horizontally long planting output shaft 78 is rotatably held by the projecting portion 30a. The planting output shaft 78 includes an intermediate shaft 70. A first relay gear 79 fixed to the side, a second relay gear 80 fitted to the transverse feed drive shaft 72 so as to be relatively rotatable, a third relay gear 82 rotatably held on the center case 30 via an idle shaft 81, The power is transmitted via the fourth relay gear 84. The fourth relay gear 84 is attached to the planting output shaft 78 via the sleeve 83.

  The ratio of the number of teeth of the first bevel gears 71a and 71b is 1: 1, and the number of teeth of the first relay gear 79, the second relay gear 80, and the fourth relay gear 84 is 1: 1: 1. There is a relationship. Accordingly, the rotational speed between the PTO shaft 29 and the planting output shaft 78 has a 1: 1 relationship. Since the third relay gear 82 is a simple idle gear, the number of teeth does not affect the rotational speed of the fourth relay gear 84.

  The planting output shaft 78 and the planting drive shaft 32 located adjacent thereto are connected by a coupling (sleeve) 86. A relay shaft 85 is disposed between the planting drive shafts 32 adjacent to each other on the left and right, and the drive shaft 32 and the relay shaft 85 are also connected by a coupling 86. Therefore, each planting drive shaft 32 rotates integrally. The planting drive shaft 32 is divided for each transplantation mechanism 8, and adjacent planting drive shafts 32 are connected by a coupling 86. The planting output shaft 78, each planting drive shaft 32, and the relay shaft 85 can be formed as a single structure made of a single bar.

(4). Structure of Transplant Mechanism / Power Transmission Structure Next, the structure of the transplant mechanism 8 and the power transmission structure for the structure will be described. These form the main part of the embodiment, and are mainly displayed in FIGS. 8 to 10 (see also FIG. 6A). The support arm 31 has a hollow structure, and as shown in FIG. 8, a longitudinally-planted transmission shaft 87 is rotatably held therein.

  Power is transmitted to the planting transmission shaft 87 from the planting drive shaft 32 by the second bevel gear pair 88a, 88b. Of the second bevel gear pair 88 a and 88 b, the bevel gear 88 b that rotates concentrically with the planting transmission shaft 87 is attached to a torque limiter 89 fitted to the planting transmission shaft 87. The torque limiter 89 has a spring 90. When a predetermined load or more is applied to the planting transmission shaft 87, the engagement is released and the power transmission is interrupted.

  A horizontally long planting center shaft 91 is rotatably held at a rear end portion (front end portion) of the support arm 31 via a pair of left and right bearings 104. The planting center shaft 91 projects to the left and right outside of the support arm 31, and a sun gear 92 built in the rotary case 36 is fixed to the projecting end portion. Although details are omitted, the rotary case 36 is rotatably held at the rear end portion of the support arm 31.

  The rotary case 36 has a hollow structure in which two left and right shell bodies are overlapped. The sun gear 92 described above is disposed in the longitudinal middle portion thereof, the intermediate gear 93 is disposed outside thereof, and the planetary gear is disposed outside thereof. A gear 94 is arranged. Each gear 92, 93, 94 is non-circular and eccentric. The planting claw member 37 is fixed to the unit shaft 95 fixed to the planetary gear 94.

  As clearly shown in FIG. 5, the planting claw member 37 is provided with a planting claw 96 and a protruding rod 97, and as shown in FIG. The seedlings are planted in the field by moving only to the field and projecting near the bottom dead center and the rod 97 moving forward relative to the planting claws 96.

  As shown in FIG. 9, power is transmitted from the planting transmission shaft 87 to the planting center shaft 91 by the pair of downstream inconstant velocity bevel gears 98 and 99. That is, a downstream inconstant speed driven bevel gear 98 is fixed to the planting transmission shaft 87 via the coupling 100, while a downstream inconstant speed driven bevel gear 99 is fitted to the planting center shaft 91. Uneven speed rotation is always transmitted from the planting transmission shaft 87 to the planting central shaft 91 by the non-constant velocity bevel gear pair 98,99.

  The downstream inconstant speed main drive bevel gear 98 has a stepped boss body 98a, and the coupling 100 is fitted in a small diameter portion of the boss body 98a. A bearing 101 is fitted in the boss body 98a. The coupling 100 is fixed to the planting transmission shaft 87 by welding and is not relatively rotatable. The downstream inconstant speed driven bevel gear 99 is fitted to the planting center shaft 91 so as to be capable of relative rotation, and has a cam portion 103 that meshes with the latching clutch 102. An operation ring 105 is integrally welded to the streak clutch 102.

  The streak clutch 102 is slidable on the planting center shaft 91 and is held in a relatively non-rotatable manner. The strut clutch 102 is normally pushed by the spring 106 so as to mesh with the downstream inconstant speed driven bevel gear 99. When a rotary operating rod (not shown) is operated, the strut clutch 102 is separated from the downstream inconstant speed driven bevel gear 99 along the axis of the planting center shaft 91, and the power to the planting center shaft 91 is cut off. Is done.

  For example, in the planting operation at the shore, there are cases where it is not desired to operate a part of the four pairs of transplantation mechanisms 8, and in such a case, by operating the retaining clutch 102, The function can be stopped. In other words, the streak function that reduces the number of planting strips is exhibited.

(5). Downstream Inconstant Speed Member In the embodiment, the downstream inconstant speed bevel gear pair 98, 99 has a function of rotating (acceleration / deceleration) at inconstant speed (the downstream inconstant speed bevel gear pair 98, 99 is used as the downstream inconstant speed member. Is adopted). This point will be described mainly based on FIGS. 10 and 9C. As shown in FIG. 10 (E), when a large number of teeth 107 are formed on the downstream inconstant speed main driving bevel gear 98, the distance from the tip of each tooth 107 to the axis O1 is gradually increased and narrowed again. doing. That is, each tooth 107 has a pitch cone angle minimum portion 108 with the shortest distance from the axis O1 to the tip, and a pitch cone angle maximum portion 109 with the widest distance from the axis O1 to the tip. The distance between them is gradually changing.

  In other words, as shown in FIG. 9C, the pitch circle 110 of each tooth 107 has a shape close to an ellipse and is decentered with respect to a perfect circle (reference numeral 110 ′ indicates the pitch circle in the case of a true circle). ing). In other words, in the normal bevel gear, the outer peripheral surface of the virtual cone is inclined at the same angle with respect to the axis at any part, but in the downstream inconstant speed main drive bevel gear 98 of the embodiment, As the outer peripheral surface of the spindle moves in the circumferential direction, the inclination angle θ1 (see FIGS. 10A and 10C) of the outer peripheral surface is gradually changed.

  The downstream inconstant speed driven bevel gear 99 has teeth 112 that are twice the number of teeth of the downstream inconstant speed driven bevel gear 98. And the position of the axial direction of each tooth | gear 112 has shifted | deviated little by little so that it can grasp | ascertain clearly from FIG. 10 (A) (B). In other words, also in the downstream inconstant speed driven bevel gear 99 of the embodiment, as in the downstream inconstant speed driven bevel gear 98, as the outer peripheral surface of the imaginary circular cylinder moves in the circumferential direction, the inclination angle θ2 of the outer peripheral surface (FIG. 10). (See (A)) is gradually changed.

  Since the downstream inconstant speed driven bevel gear 99 has twice the number of teeth of the downstream inconstant speed driven bevel gear 98, the downstream inconstant speed driven bevel gear 98 has two pitch cone angle maximum portions 113 and a minimum pitch cone angle minimum. Part 114. Therefore, as shown in FIG. 9 (C), the pitch circle 115 of the downstream inconstant speed driven bevel gear 99 has a substantially elliptical shape, and is symmetrical with respect to the axis O2 (FIG. 9 (C). ), The pitch circle in the case of a perfect circle is indicated by reference numeral 115 '). That is, the downstream inconstant velocity bevel gear pair 98, 99 continuously changes the pitch cone angles θ1, θ2 along the rotation direction in a state where the cone distance γ (see FIG. 10C) is constant. It is. As can be seen from the above description, the downstream inconstant bevel gear pair 98, 99 as the downstream inconstant speed member is a single stage, and the upstream inconstant speed first to fourth gears 48, 56 as the upstream inconstant speed member. , 121, 122 are not changed (no speed switching).

  As described above, after the pitch circles 110 and 115 of the downstream inconstant velocity bevel gears 98 and 99 are decentered with respect to a perfect circle having a shape close to an ellipse and centering on the rotation axes (axis centers) O1 and O2, By making each of the outer diameter shapes perfect circles, the pair of downstream inconstant speed bevel gears 98 and 99 can be formed in the same size as a normal bevel gear, and the pair of downstream inconstant speed bevel gears 98 and 99 in the power transmission system. The assembly space can be made smaller and more compact. In this case, the idea of manufacturing the downstream inconstant velocity bevel gears 99, 99 is to cut the distorted conical shape formed with a constant conical distance by a common cylinder with the rotation axes O1, O2 to make the outer diameter shape true. It will be a circle.

  Here, the upstream inconstant speed bevel gear pair 98, 99 also adjusts the mounting phase in the same manner as the upstream inconstant speed first to fourth gears 48, 56, 121, 122, and the above-mentioned maximum speed phase is set to the bottom dead center. The setting can be changed in a direction further away from the position. FIG. 13 shows, as an example, a change in angular velocity of the planting claw 96 when 43 strains are set at unequal speed. The thick one-dot chain line in FIG. 13A is obtained by assembling the upstream inconstant speed third gear 121 and the upstream inconstant speed fourth gear 122 so that the front side (upstream side) from the bottom dead center is the fastest phase MS1. In this case, the downstream inconstant velocity bevel gear pair 98, 99 is further assembled so that the front side from the bottom dead center is the highest speed phase MS1 '(see FIG. 12). A thick solid line in FIG. 13B indicates that the upstream inconstant speed third gear 121 and the upstream inconstant speed fourth gear 122 are assembled and the downstream inconstant speed bevel gear pair is set so that the vicinity of the bottom dead center is the fastest phase MS2. This is a case where 98 and 99 are assembled. The thick two-dot chain line in FIG. 13C assembles the upstream inconstant speed third gear 121 and the upstream inconstant speed fourth gear 122 so that the rear side (downstream side) from the bottom dead center is the highest speed phase MS3. In addition, the downstream inconstant velocity bevel gear pair 98, 99 is further assembled so that the rearmost side from the bottom dead center is the highest speed phase MS3 ′ (see FIG. 12). When configured in this manner, the operation speed of the planting claw 96 increases near the bottom dead center, and the effect of allowing the planting claw 96 to escape from the bottom dead center accurately and quickly can be further promoted.

(6). Summary FIG. 5C shows the relationship between the number of planted stocks per 3.3 square meters and the movement trajectory of the planting claws 96. As can be seen from this figure, even when the planting claw 96 rises directly above the bottom dead center when densely planted, the planting claw 96 escapes poorly at the time of sparse planting, causing a phenomenon that the seedling is moved forward. Understandable.

  And in embodiment, the upstream inconstant speed 1st-4th gear 48,56,121,122 was provided in the inter-strain transmission 26, and the downstream inconstant speed bevel gear pair 98,99 was provided in the seedling planting apparatus 2. By providing, the planting claw member 37 is accelerated and rotated so that the operation speed is increased in the vicinity where the planting claw 96 is located at the bottom dead center. For this reason, the planting claw 96 quickly escapes from the bottom dead center, and as a result, it is possible to prevent the planting claw 96 from moving the seedling forward.

  In the embodiment, since the inconstant speed member is separated and arranged in the inter-strain transmission device 26 and the seedling planting device 2, the distance from the inter-strain transmission device 26 to the downstream inconstant speed bevel gear pair 98, 99 is compared with the conventional one. The ratio of non-uniform rotation is small. As a result, torsion occurring in the transmission elements (PTO shaft 29, planting drive shaft 32, planting transmission shaft 87, etc.) constituting the power transmission system is remarkably suppressed, and smooth movement of the transplanting mechanism 8 can be ensured. Moreover, since the play which generate | occur | produces in a power transmission system can also be suppressed, the malfunction that the timing of unequal speed shifts | deviates and the planting posture of a seedling is disturbed can also be prevented.

  Now, since the transplanting mechanism 8 has a configuration in which the planting claw members 37 are swingably attached to both ends of the elongated rotary case 36, the planting claw member 37 itself plays the role of a weight and generates a large inertia force. In addition, a large load is generated when the seedling is scraped, and a negative load is generated thereafter. That is, due to the swinging of the planting claw member 37, a large torque fluctuation occurs in a cycle of overload → no load → negative load with respect to the rotation of the transplant mechanism 8. Such torque fluctuations appear remarkably when the resonance rotational speed is exceeded even when rotating at a constant speed during dense planting (because the transplanting mechanism 8 rotates at a higher speed during dense planting than during loose planting).

  More specifically, even if the transplanting mechanism 8 rotates at a constant speed, when one planting claw member 37 escapes from the field, the other planting claw member 37 has shifted to scraping of the seedlings. It can be said that the planting claw member 37 acts to cancel each other's load fluctuations. However, since a large torque is required for scraping off the seedlings, the function of leveling the torque fluctuation is weak only by the movement of the two planting claw members 37. For this reason, the transplanting mechanism 8 does not rotate smoothly, and a phenomenon called “sucking” easily occurs.

  On the other hand, when the transplant mechanism 8 is slightly rotated at a non-uniform speed by the downstream inconstant speed bevel gear pair 98, 99 even in the dense planting state as in the embodiment, the seedling scraping by the planting claw member 37 causes the inertial force. In addition, since the transplantation mechanism 8 is decelerated after the seedling is scraped off, it is possible to suppress a large inertial force from acting on the transplantation mechanism 8. For this reason, load fluctuations (or torque fluctuations) acting on the transplantation mechanism 8 can be leveled to ensure smooth rotation.

(7). Others The present invention can be embodied in various ways other than the above embodiment. For example, when the bevel gear is a downstream inconstant speed member, the first bevel gear pair 71a, 71b may be a downstream inconstant speed member, or the second bevel gear pair 88a, 88b may be a downstream inconstant speed member. It is also possible to provide inconstant velocity members at three or more locations in the power transmission system. Further, the seedling planting apparatus 2 may be provided with a plurality of inconstant speed members in the traveling machine body without providing inconstant speed members.

  Further, the inter-stock transmission 26 can be built in the mission case 11, and in this case, one upstream inconstant speed member is built in the mission case 11. When providing an inconstant speed member in each of the traveling body 1 and the seedling planting device 2, the acceleration / deceleration ratio (the inconstant speed ratio) may be set as necessary. Therefore, in some cases, the acceleration / deceleration ratio (unequal speed ratio) on the traveling machine body 1 side can be made smaller than the inconstant speed conversion ratio in the seedling planting device 2.

DESCRIPTION OF SYMBOLS 1 Traveling machine body 2 Seedling planting device 8 Transplanting mechanism 10 Engine 11 Transmission case 26 Stock transmission device 36 Rotary case 37 Planting claw member 40 Stocking case 41 Input shaft 42 Output shaft 45 Intermediate shaft 48 Upstream inconstant speed first gear 49 Clutch 51 Idle shaft 56 Upstream non-constant speed second gear 57 First intermediate clutch 87 Planting transmission shaft 91 Planting central shaft 96 Planting claw 98 Downstream non-constant speed driven bevel gear 99 Downstream non-constant speed driven bevel gear 121 Upstream non-constant speed Third gear 122 Upstream non-constant speed fourth gear 123 Second intermediate clutch

Claims (4)

A transmission case for shifting the power from the engine mounted on the traveling machine body, a seedling planting device having a transplanting mechanism with a planting claw for drawing a non-circular movement locus, and the operation of the transplanting mechanism with respect to the traveling speed of the traveling machine body In a rice transplanter equipped with an inter- stock transmission that changes the speed by changing the speed,
An inconstant speed member that transmits inconstant speed rotational power to the transplanting mechanism is provided separately in an upstream inconstant speed member on the inter-gear transmission apparatus side and a downstream inconstant speed member on the seedling planting apparatus side. The upstream inconstant speed member can be switched to a plurality of stages and the acceleration / deceleration ratio of each stage is different, and the downstream inconstant speed member is configured in a single stage,
In each stage of the upstream inconstant speed member, the highest speed phase at which the operation speed of the planting claw in the transplanting mechanism is the highest speed can be set and changed in a range before and after the bottom dead center.
Rice transplanter. In the downstream inconstant speed member, the maximum speed phase can be set and changed in a direction further away from the bottom dead center.
The rice transplanter according to claim 1. The inter-stock transmission is provided on the traveling machine body side,
The rice transplanter according to claim 1. The power transmission system from the inter-strain transmission to the transplanting mechanism has rotating shafts that intersect each other, and is configured to transmit power to these intersecting rotating shafts via a bevel gear pair. As the speed member, the bevel gear pair is configured as an inconstant speed gear,
The rice transplanter according to claim 2.

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