JP2007325528A - Transmission structure of agricultural working machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To miniaturize a transmission case used in an agricultural working machine in the right and the left directions. <P>SOLUTION: A transmission structure of the agricultural working machine is obtained by operatively connecting a transmission shaft 50 transversely installed and supported in a transmission case 9 with a main speed change gear device 30 for performing changeover to normal rotation and reverse rotation and variable speed transmission in the normal rotation and reverse rotation, installing gears G1 and G2 for taking off power of the normal rotation and power of the reverse rotation as power for traveling and a PTO (power take-off) transmission member 60 for taking off only the power of the normal rotation of the transmission shaft 50 as operation power through a one-way clutch 61 in juxtaposition with the transmission shaft 50, supporting an intermediate transmission shaft 64 operatively connected with the PTO transmission member 60 in parallel to the transmission shaft 50 and installing a gear group of a PTO transmission mechanism 32 for shifting gears of the power for working into a plurality of stages in juxtaposition with the intermediate transmission shaft 64. In the transmission structure of the agricultural working machine, an output part 63 is provided eccentrically to the inward side of the case (the outward side of the case) of the PTO transmission member 60 and an input part 65 is installed eccentrically to the inward side of the case (the outward side of the case) of the gear group installed in juxtaposition with the intermediate transmission shaft 64 in the intermediate transmission shaft 64. The output part 63 and the input part 65 are oppositely installed and operatively connected. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a transmission structure used for an agricultural work machine such as a rice transplanter, a direct seeder, or a weeder.

As a transmission structure of a rice transplanter that is an example of an agricultural work machine, for example, as disclosed in Patent Document 1, a transmission shaft that is horizontally mounted on a mission case, switching between forward and reverse, and forward and reverse rotation The output shaft of the main transmission consisting of a hydrostatic continuously variable transmission that performs continuously variable transmission is gear-coupled via a separate transmission shaft, and forward power and reverse power are used as driving power for this transmission shaft. A gear to be taken out and a gear to take out only the forward rotation power of the transmission shaft as PTO power through a one-way clutch are installed in parallel, and an intermediate transmission shaft (cylinder shaft) linked to the PTO power removal gear is connected to the transmission shaft. A gear group of an inter-stock transmission mechanism that is supported in parallel with the motor and shifts the working power in multiple stages is known in parallel with an intermediate transmission shaft.
JP 2000-350506 A

  In rice transplanters, it is necessary to drive the seedling planting device connected to the traveling machine in synchronization with the traveling speed, and to maintain the stock between the strains even if the traveling speed is changed. It is necessary to choose. The seedling planting device needs to be driven only during forward traveling in which the transmission shaft rotates in the forward direction, and the above structure is employed to satisfy these demands.

  In the above-described conventional transmission structure, the PTO power take-out gear mounted on the transmission shaft is provided at the end of the boss portion in which the one-way clutch is fitted, on the inner side of the transmission case, and interlocked with this gear. The gear that transmits the PTO power to the intermediate transmission shaft is provided outside the transmission case of the gear group in the inter-shaft transmission mechanism, and the left-right space occupied by the inter-shaft transmission mechanism and the gear boss is large. It was necessary to increase the width of the mission case.

  The present invention has been made paying attention to such points, and its main purpose is to reduce the size of the transmission case in the left-right direction while satisfying the expected function by rational modification of the transmission structure. It is said.

In the first aspect of the invention, a transmission shaft that is horizontally supported on a transmission case is linked to a main transmission that performs forward / reverse switching and forward / reverse and continuously variable transmission. The forward transmission power and reverse rotation are connected to the transmission shaft. A gear for taking out the power as traveling power and a PTO transmission member for taking out only the forward rotation power of the transmission shaft as working power through a one-way clutch are installed in parallel, and the intermediate transmission shaft linked to the PTO transmission member is connected to the PTO transmission member. In the transmission structure of the agricultural work machine, which is mounted in parallel with the transmission shaft and equipped with a gear group of a PTO transmission mechanism that shifts the working power in multiple stages in parallel to the intermediate transmission shaft,
The PTO transmission member is deflected at the end of the case inward or outward of the case to provide an output part, and the gear group equipped in parallel with the intermediate transmission shaft is biased toward the case inward or case outward. An input portion is provided on the intermediate transmission shaft, and the output portion and the input portion are arranged to face each other and interlocked to each other.

  According to the above configuration, the output portion of the PTO transmission member and the input portion of the intermediate transmission shaft are located on the same side of the case inner side or the case outer side, and the PTO transmission member and the PTO transmission mechanism are the fuselage. When viewed from the front-rear direction, they are arranged overlapping in the left-right direction.

  Therefore, according to the first invention, it is possible to reduce the size of the transmission case in the left-right direction by the amount that the PTO transmission member and the PTO speed change mechanism are overlapped.

According to a second invention, in the first invention,
The output shaft of the main transmission and the transmission shaft are concentrically connected.

  According to the above configuration, the transmission shaft can be saved compared to the conventional structure in which a separate transmission shaft is interposed between the output shaft and the transmission shaft of the main transmission, and this is effective in reducing the size of the transmission case. It becomes.

According to a third invention, in the first or second invention,
The PTO transmission member is composed of a boss portion that is externally fitted to the transmission shaft via the one-way clutch and an output portion that is loosely fitted to the transmission shaft, and the boss portion and the output portion are axially arranged. Are connected to the bite.

  According to the above configuration, the degree of freedom in assembling the PTO transmission member to the transmission shaft via the one-way clutch is increased as compared with the structure in which the gear as the output unit is formed integrally with the boss portion to configure the PTO transmission member. .

A fourth invention is the invention according to any one of the first to third inventions,
A plurality of gears for taking out the driving power are arranged in parallel on the transmission shaft, and a sub-transmission mechanism for driving is provided to select a plurality of gears and perform transmission in a plurality of stages.

  According to the above configuration, the transmission shaft can be the drive-side transmission shaft in the auxiliary transmission mechanism, which is effective in reducing the transmission shaft and reducing the size of the transmission case.

A fifth invention is the invention according to any one of the first to fourth inventions,
The transmission case is configured in a split structure in which the left and right divided case parts are connected, and is connected to the outer end of the pivoting operation shaft that is inserted and attached to one divided case part from the lateral outer side from the other divided case part. The abutted contact portions are close to each other.

  According to the above configuration, the contact portion provided continuously from the other divided case portion can prevent the rotation operation shaft from slipping out of the case. This is unnecessary, and is effective in saving parts and reducing costs.

  1 and 2 show a side surface and a plane of a riding type rice transplanter as an example of a working machine. This rice transplanter is a 6-row planting seedling as a working device at the rear of a four-wheel drive 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. The planting device 4 has a basic structure in which a vertical quadruple link mechanism 6 driven by a hydraulic cylinder 5 is connected so as to be movable up and down, and a fertilizer device 7 is provided at the rear of the machine body.

  A transmission case 9 that pivotally supports the front wheel 1 is connected and fixed to the front part of the body frame 8 in the traveling body 3, and a rear transmission case 10 that is equipped with the rear wheels 2 on the left and right at the rear part of the body frame 8. Is supported so that it can roll. A front frame 11 extends forward from the mission case 9, and an engine 12 is mounted horizontally on the front frame 11 and covered with a hood 13. The boarding driving part located behind the engine 12 is provided with a steering handle 14 for steering the front wheel 1, a driving seat 15, a step 16, and the like. Preliminary seedling raising bases 17 are provided for placing and accommodating in stages.

  The seedling planting device 4 mounts six mat-like seedlings in parallel and cuts out seedlings one by one from the lower end of the seedling stage 21 and the seedling stage 21 which are reciprocated by a predetermined stroke in the left-right direction. 6 sets of rotary planting mechanisms 22 to be planted, three leveling floats 23 arranged in parallel so as to level the planting location on the surface, and the like.

  The main part of the fertilizer application device 7 is mounted on the traveling machine 3 between the driver's seat 15 and the seedling planting device 4, and a fertilizer hopper 24 for storing powdered fertilizer and a fertilizer in the fertilizer hopper 24 are set. Rotating roll type feeding mechanism 25 that feeds out by quantity, electric blower 28 that winds fed fertilizer to groove forming device 27 provided in each leveling float 23 via supply hose 26, and the like. It is comprised so that a fertilizer may be sent and embed | buried in the groove | channel which the field surface T formed.

3 and 4 schematically show the transmission system.
A main transmission 30 consisting of a hydrostatic continuously variable transmission (HST) is connected to the left side surface of the mission case 9 and is linked to the engine 12 by a belt. The output of the main transmission 30 is connected to the mission case 9. Is branched into a traveling system and a working system. The power of the branched traveling system is transmitted to the front wheels 1 and the rear wheels 2 via the gear-type sub-transmission mechanism 31, and the power of the branched working system is transmitted to the gear-type PTO transmission mechanism (inter-company transmission mechanism) 32 and The PTO clutch (planting clutch) 33 is taken out rearward from the PTO shaft 34, and the extracted power is transmitted to the seedling planting device 4 via the transmission shaft 35a and the expansion / contraction transmission shaft 35b.

  The main transmission 30 has a variable displacement hydraulic pump P that can switch the pressure oil discharge direction between forward and reverse and can change the discharge amount steplessly, and is driven to rotate by receiving pressure oil from the hydraulic pump P. A fixed displacement hydraulic motor M is built in, and an input shaft (pump shaft) 36 for driving the hydraulic pump P is driven in a belt-linked manner with the engine 12, and an output shaft (pump shaft) of the hydraulic motor M is driven. ) The speed change power taken out from 37 is transmitted to the mission case 9.

  The main transmission 30 is linked to a main transmission lever 18 that can be swung back and forth on the left side of the steering handle 14 and can be held at an arbitrary operation position, so that the main transmission lever 18 is in a neutral position. By operating, the amount of pressure oil discharged from the hydraulic pump P becomes zero and traveling is stopped, and by operating the main transmission lever 18 forward from the neutral position, pressure oil is discharged from the hydraulic pump P in the positive direction. Thus, the continuously variable transmission in the forward direction is performed, and by operating backward from the neutral position, the hydraulic oil is discharged in the reverse direction from the hydraulic pump P, and the continuously variable transmission in the backward direction is performed.

  A portion of the power input to the transmission case 9 is shifted to the differential gear 38 by the auxiliary transmission mechanism 31 and then transmitted to the differential gear 38. The differential gear 38 is branched to the left and right differential shafts 39 to be shifted to the front wheels 1 Is transmitted to. A part of the power transmitted to the differential device 38 is branched by the bevel gear, taken out of the case from the rear wheel drive shaft 40, and transmitted to the rear transmission case 10 via the transmission shaft 41 arranged along the lower part of the fuselage. Then, it is transmitted to the left and right rear wheels 2 via the multi-plate type side clutch 42.

  The differential device 38 includes a differential lock mechanism 43 that integrates the left and right differential shafts 39. The diff lock mechanism 43 is linked to a diff lock pedal 44 provided at the rear portion of the foot, and the left and right front wheels 1 can be driven at a constant speed by depressing the diff lock pedal 44. Yes. The rear wheel drive shaft 40 is equipped with a multi-plate brake 45, and the brake 45 is linked to a brake pedal 46 disposed at the right front position of the foot, and the rear wheel drive is performed by depressing the brake pedal 46. By braking the shaft 40, the entire traveling system is braked, and the front wheel 1 and the rear wheel 2 can be braked simultaneously. The brake pedal 46 is also linked to the operation system of the main speed change lever 18, and when the brake pedal 46 is depressed, the main speed change lever 18 in the forward shift range or the reverse shift range is forcibly returned to the neutral position. It is like that.

  Although the detailed structure is not shown, the left and right side clutches 42 are automatically operated in conjunction with the steering of the front wheels 1, and the steering wheel 14 moves the front wheels 1 to the left or right at a set angle (for example, 30 °). ) When steered as described above, the side clutch 42 of the rear wheel 2 that is on the inside of the turn is automatically turned off, and a small turn is performed by three-wheel drive with the left and right front wheels 1 and the rear wheel 2 on the outside of the turn. It is like that.

Details of the internal structure of the mission case 9 are shown in FIGS.
The transmission case 9 is constructed by bolting left and right divided case portions 9a, 9b made of aluminum die cast, and an input transmission shaft 50 mounted horizontally on the transmission case 9 is a main transmission 30. The output shaft 37 is concentrically connected. A transmission shaft 50 that is driven to rotate by being continuously variable in the forward and reverse directions in response to an output from the main transmission 30 and a traveling system transmission shaft 51 that is supported in parallel with the transmission shaft 50 are connected via the auxiliary transmission mechanism 31. Linked together.

  The sub-transmission mechanism 31 includes large and small gears G1 and G2 fixed to the left half of the transmission shaft 50 and a shift gear SG splined to the traveling transmission shaft 51. The shift gear SG is shown in FIG. In FIG. 5, the gear G3 is shifted to the right and the large-diameter gear G3 is engaged with the gear G2, so that "low speed" is brought about. The shift gear SG is shifted to the left in FIG. Engagement results in “high speed”, and the speed change power is extracted from the output gear G 5 fixed to the right end of the speed change shaft 51. The shift operation shaft 52 that shifts the shift gear SG of the subtransmission mechanism 31 is pushed and pulled by a front / rear swing operation of the subtransmission lever 19 that is provided on the left side of the driver seat 15 so as to swing back and forth. It has become.

  A differential gear case 53 in the differential device 38 for driving the front wheels is supported by a bearing below the transmission case 9, and a large-diameter input gear G 6 fixed near the right end of the differential gear case 53 is an output of the traveling system transmission shaft 51. The gear G5 is interlocked with the gear G5, and the transmission power from the subtransmission mechanism 31 is greatly reduced and transmitted to the differential device 38. The differential lock mechanism 43 is configured so that the left and right differential shafts 39 are integrally rotated by engaging a shift collar 54 key-coupled to the left differential shaft 39 with a left end portion of the differential gear case 53. A differential lock operating shaft 55 for shifting the shift collar 54 is linked to the differential lock pedal 44.

  A bevel gear G7 fixed to a position near the right end of the differential gear case 53 and a bevel gear G8 formed integrally with the front end of the rear wheel drive shaft 40 are engaged with each other, and a part of the driving power transmitted to the differential device 38 is rearward. It is taken out from the wheel drive shaft 40. The brake 45 mounted on the rear wheel drive shaft 40 includes a plurality of friction plates 57 that are externally splined to the rear wheel drive shaft 40, and the friction plates 57 that are non-rotatably engaged and supported on the inner surface of the case. The brake plate 56 includes a plurality of alternately stacked brake plates 56 and a press collar 58 that is fitted to the rear wheel drive shaft 40 so as to be shiftable. The friction plate 57 and the brake plate are operated by shifting the press collar 58 forward. The rear wheel drive shaft 40 is frictionally braked by pressure-contact polymerization with 56.

  A rotation operation shaft 59 for shifting the pressing collar 58 back and forth is linked to the brake pedal 46. When the brake pedal 46 is not depressed, the pressing collar 58 is released from the pressing force by the return urging force of the brake pedal 46. The pressing collar 58 is pressed and shifted by retracting to the position and depressing the brake pedal 46 against the return urging force. This rotation operation shaft 59 is inserted and supported from the right lateral outer side to the bearing boss portion 9e of the left divided case portion 9a in the transmission case 9, and is a contact portion integrally protruding from the right divided case portion 9b. As 9c approaches the outer end of the rotation operation shaft 59 and is disposed opposite to it, the extraction of the rotation operation shaft 59 is prevented.

  A PTO transmission member 60 is fitted on the right half of the transmission shaft 50. The PTO transmission member 60 includes a boss portion 62 that is externally fitted to the transmission shaft 50 via a one-way clutch 61, and an output portion 63 that is loosely fitted to the transmission shaft 50. The output part 63 is nail-engaged from the axial direction at the left end, and the boss part 62 and the output part 63 are integrally rotated. The one-way clutch 61 has a characteristic of transmitting only the forward rotation power of the transmission shaft 50 to the boss portion 62, and only the forward rotation power of the transmission shaft 50 that rotates forward and reverse is transmitted from the output portion 63 of the PTO transmission member 60. It is taken out and transmitted to the PTO transmission mechanism 32.

  The PTO transmission mechanism 32 includes a cylindrical shaft-shaped intermediate transmission shaft 64 that is loosely supported by the right half of the traveling system transmission shaft 51, an input portion 65 that is externally fitted and fixed to the intermediate transmission shaft 64, and an intermediate transmission shaft 64. A plurality (six in this example) of drive-side gears G11 to G16 that are externally fitted and fixed in parallel, a PTO transmission shaft 66 supported in parallel with the traveling transmission shaft 51, and the PTO transmission shaft 66 It is composed of a plurality of driven gears G17 to G22, etc. that are loosely fitted in parallel and always engaged with each of the drive side gears G11 to G16.

  The input portion 65 is located at an end portion of the PTO transmission mechanism 32 on the inner side of the case, and is disposed to face the output portion 63 of the PTO transmission member 60, and has a small-diameter output gear G9 formed in the output portion 63. The large-diameter input gear G10 formed in the input unit 65 is interlocked and interlocked so that the normal rotation power of the PTO transmission member 60 is reduced and transmitted to the intermediate transmission shaft 64 of the PTO transmission mechanism 32.

  The right half of the PTO transmission shaft 66 that loosely supports the driven gears G17 to G22 is formed in a cylindrical shaft portion 66a, and can be moved back and forth in the radial direction at each gear mounting position of the cylindrical shaft portion 66a. A plurality of transmission balls 67 are engaged with each other in the circumferential direction. When the transmission ball 67 is immersed inward from the outer periphery of the cylindrical shaft portion 66a, the driven-side gears G17 to G22 fitted outside are allowed to rotate freely, and the transmission ball 67 protrudes from the outer periphery of the cylindrical shaft portion 66a and is driven. By engaging with a large number of engaging recesses 68 formed along the inner periphery of the side gears G17 to G22, the driven side gears G17 to G22 and the PTO transmission shaft 66 are brought into a transmission state in which they rotate together. It is configured, and by selecting any one of the six driven gears G17 to G22 and selecting the transmission state, the PTO transmission shaft 66 can be shifted to six stages. It has become.

  A shift operation shaft 69 is inserted through the center of the cylindrical shaft portion 66a of the PTO transmission shaft 66 so as to be reciprocally movable in the axial direction. The outer diameter of the speed change operation shaft 69 is formed to have a small diameter so as to form a space sufficient for the transmission ball 67 to fall inward from the outer periphery of the cylindrical shaft portion 66a and retract, and the case of the speed change operation shaft 69. A large-diameter portion 69a slidably in contact with the inner periphery of the cylindrical shaft portion 66a is attached to the inner end portion in a flange shape, and six sets are arranged in parallel in the axial direction by shifting the speed change operation shaft 69. One set of the transmission balls 67 is pushed and displaced to the outer periphery by the large-diameter portion 69a, so that one set of six normally-engaged gear pairs is set in the transmission state, and the intermediate transmission shaft 64 is transferred to the PTO transmission shaft 66. Power transmission is performed at a desired transmission ratio.

  Six annular grooves 70 are formed in parallel on the speed change operation shaft 69 at a pitch corresponding to the gear parallel pitch, and a detent ball 71 engaged with one of the annular grooves 70 is formed on the wall portion of the transmission case 9. Is installed so that the shift operation shaft 69 is stably held at each of the selected six shift operation positions.

  The output bevel gear G23 connected and fixed to the left end portion of the PTO system transmission shaft 66 and the input bevel gear G24 loosely fitted to the PTO shaft 34 are engaged, and the working power transmitted to the input bevel gear G24 is the PTO clutch. It is transmitted to the PTO shaft 34 via 33.

  The PTO clutch 33 includes a drive side clutch member 72 connected to the input bevel gear G24, a driven side clutch member 73 slidably mounted on the PTO shaft 34, and the driven side clutch member 73 as a drive side clutch member. The pawl clutch is provided with a clutch spring 74 that slidably urges toward 72. The driven-side clutch member 73 is slid and biased by the drive-side clutch portion 72, thereby bringing about a “clutch-on” state in which power is transmitted from the drive-side clutch member 72 to the PTO shaft 34. The clutch member 73 is slid backward against the clutch spring 74, thereby bringing about a “clutch disengagement” state in which power transmission from the drive side clutch member 72 to the PTO shaft 34 is interrupted.

  The driven clutch member 73 is formed with an inclined cam 75 whose height in the axial direction changes depending on the rotation phase, and the clutch operating shaft 76 can be slid inward and outward on the side of the PTO clutch mounting portion. Has been deployed. As shown in FIG. 6, when the clutch operating shaft 76 is retracted outward, the driven clutch portion 73 is slid and biased to bring about the “clutch engaged” state. Is pushed in, the tip of the clutch operating shaft 76 enters the rotation locus of the inclined cam 75, and the inclined cam 75 rides on the clutch operating shaft 76 whose axial center position is fixed. Due to the climbing cam action of the shaft 76 and the inclined cam 75, the driven side clutch member 73 is forcibly retracted against the clutch spring 74 with its rotation, and a “clutch disengaged” state in which the claw engagement is disengaged. Brought about.

  The PTO clutch 33 configured as described above has a fixed position stop function in which the driven-side clutch member 73 is brought into a “clutch disengaged” state at a predetermined rotational phase. In this “clutch disengaged” state, The rotation phase of the PTO transmission system is set so that the mechanism 22 stops at the rotation phase rising from the surface T.

  As shown in FIGS. 5 and 9, a hydraulic pump 77 serving as a hydraulic source such as the hydraulic cylinder 5 and power steering means described later is connected laterally to the front right side surface of the transmission case 9. A pump drive shaft 78 for driving the hydraulic pump 77 is disposed laterally in the mission case 9. One end of the pump drive shaft 78 is splined concentrically with the extension end in the case of the input shaft 36 in the main transmission 30 via a connection sleeve 79, and the other end of the pump drive shaft 78 is input to the hydraulic pump 77. The shaft 80 is splined concentrically via a connecting sleeve 81, and the hydraulic pump 77 is driven by engine power input to the main transmission 30.

  As shown in FIGS. 8 and 9, a hydraulic torque generator 85 for power steering is connected to the front upper surface of the transmission case 9 in a slightly tilted posture, and extends obliquely rearward and upward from the torque generator 85. The steering handle 14 is connected to the upper end of the steering operation shaft 86. An output shaft 87 that is hydraulically torqued up from the lower surface of the torque generator 85 is projected with the same backward tilt angle as the steering operation shaft 86, and the steering shaft 88 concentrically connected to the output shaft 87 In front of the pump drive shaft 78, it is rushed into the mission case 9.

  A rotation shaft 89 is provided through the front bottom wall of the transmission case 9, and a sect gear 90 connected to a case inner portion of the rotation shaft 89 and a pinion gear 91 integrally formed at the lower end portion of the steering shaft 88 are engaged. At the same time, a pitman arm 92 for steering the front wheels is connected to the outer end of the case of the rotating shaft 89, and tie rods 93 pivoted left and right from the free end of the pitman arm 92 connect the left and right front wheels 1. The knuckle arm (not shown) that steers is interlocked and connected.

  As shown in FIG. 9, an oil filter 95 is attached to the right side surface of the mission case 9. As shown in the hydraulic circuit diagram of FIG. 10, the lubricating oil stored in the transmission case 9 is introduced into the oil filter 95 as hydraulic oil, and the purified hydraulic oil is passed through an oil passage a formed in the case wall. The hydraulic oil sucked by the hydraulic pump 77 and pressurized and discharged by the hydraulic pump 77 is supplied to the torque generator 85 via the external pipe 96. The return oil sent out from the torque generator 85 is guided to the seedling planting device raising / lowering hydraulic circuit via the external pipe 97, used for the operation of the hydraulic cylinder 5 via the control valve 98, and further sent out from the control valve 98. After the supplied hydraulic oil is supplied to the charging oil passage b of the main transmission 30, the surplus oil is returned to the transmission case 9.

  As shown in FIG. 9, the surplus oil filled in the casing of the main transmission 30 is introduced into the front axle case portion 9 d on the left side of the transmission case 9 via a pipe 99 provided in the transmission case 9. After that, it is returned to the mission case 9.

  As shown in FIG. 8, a blazer plug 82 having a gas-liquid separation chamber is attached to the front upper end of the mission case 9, and an insertable / removable oil gauge 83 is attached to the upper surface of the mission case 9. .

[Other Examples]
(1) While the output part 63 of the PTO transmission member 60 is provided to be deviated to the outside of the case, the input part 65 of the intermediate transmission shaft 64 may be provided to be deviated to the same side.

  (2) The boss portion 62 and the output portion 63 can be formed integrally.

  (3) It is also possible to transmit forward / reverse power from the output shaft 37 to the transmission shaft 50 by interposing another transmission shaft between the output shaft 37 and the transmission shaft 50 of the main transmission 30.

Whole side view of rice transplanter Overall plan view of rice transplanter Schematic diagram of transmission system Schematic diagram of transmission system Plan view across the main part of the mission case Sectional view of part of the mission case Expanded cross section of PTO transmission mechanism Right side view of the front of the mission case Front view of the front of the mission case Hydraulic circuit diagram

Explanation of symbols

DESCRIPTION OF SYMBOLS 9 Transmission case 9a Division | segmentation case part 9b Division | segmentation case part 9c Contact part 30 Main transmission 31 Sub transmission 32 PTO transmission mechanism 37 Output shaft 50 Transmission shaft 59 Turning operation shaft 60 PTO transmission member 61 One-way clutch 62 Boss part 63 Output section 64 Intermediate transmission shaft 65 Input section

Claims (5)

The transmission shaft that is horizontally mounted on the transmission case is linked to the main transmission that performs forward / reverse switching and forward / reverse and continuously variable transmission. The forward / reverse power is used as driving power for this transmission shaft. A gear to be taken out and a PTO transmission member that takes out only the forward rotation power of the transmission shaft as working power through a one-way clutch are installed in parallel, and an intermediate transmission shaft linked to the PTO transmission member is supported in parallel with the transmission shaft. In the transmission structure of the agricultural working machine equipped with the gear group of the PTO transmission mechanism for shifting the working power in a plurality of stages in parallel to the intermediate transmission shaft,
The PTO transmission member is deflected at the end of the case inward or outward of the case to provide an output part, and the gear group equipped in parallel with the intermediate transmission shaft is biased toward the case inward or case outward. A transmission structure for an agricultural working machine, characterized in that an input portion is provided on the intermediate transmission shaft, and the output portion and the input portion are arranged opposite to each other and interlocked to each other.   The transmission structure of an agricultural work machine according to claim 1, wherein an output shaft of the main transmission and the transmission shaft are concentrically connected.   The PTO transmission member is composed of a boss portion that is externally fitted to the transmission shaft via the one-way clutch and an output portion that is loosely fitted to the transmission shaft, and the boss portion and the output portion are axially arranged. The transmission structure for an agricultural work machine according to claim 1 or 2, wherein the transmission structure is occluded.   A plurality of said gears for taking out the driving power are arranged in parallel on said transmission shaft, and a sub-transmission mechanism for driving is provided, which selects one of these gears and performs a plurality of speed transmissions. The transmission structure of the agricultural work machine as described in any one of Claims.   The transmission case is configured in a split structure in which the left and right divided case parts are connected, and is connected to the outer end of the pivoting operation shaft that is inserted and attached to one divided case part from the lateral outer side from the other divided case part. The transmission structure of the agricultural work machine according to any one of claims 1 to 4, wherein the contacted portions are close to each other.

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