JP5847050B2 - Paddy field machine - Google Patents

Description

  The present invention relates to a riding-type driving unit, a main transmission that shifts driving force from an engine, and a transmission case that inputs driving force from the main transmission and outputs the input driving force to a traveling device and a working unit. It is related with the paddy field machine provided with.

  Conventionally, as a paddy field work machine described above, there has been a riding type rice transplanter described in Patent Document 1, for example. This riding-type rice transplanter has a gear-type sub-transmission mechanism and a gear-type inter-shaft transmission mechanism housed in a transmission case as a transmission case, and the driving force input from the main transmission to the transmission case is used for traveling and working. The driving power that is branched for traveling is input to the gear-type sub-transmission mechanism to shift the gear, and then output from the sub-transmission mechanism to the front wheels and the rear wheels. The work driving force branched for the purpose is input to a gear-type inter-strain speed mechanism for shifting, and then output from the inter-strain transmission mechanism to a seedling planting device.

JP 2009-92169 A

  In paddy field machines, if it is possible to drive the traveling device with a stronger driving force than during work traveling or traveling traveling, it is possible to smoothly move over the ridge and escape when the traveling device sinks into a deep mud layer. This is advantageous because it can be carried out and the movement and work between fields can be performed quickly and easily.

  When the above-described conventional technology related to transmission is applied to enable the traveling device to be driven with a driving force stronger than that during work traveling or traveling traveling, the number of shift stages of one gear-type sub-transmission mechanism Need to be more. Then, the auxiliary transmission mechanism becomes a large-sized one having a large-diameter gear, and the vertical height of the transmission case tends to increase.

  The object of the present invention is to enable the driving device to be driven with a driving force suitable for moving over and over the wing while suppressing the enlargement of the transmission case and shifting the work section in multiple stages with a simple transmission structure. It is to provide a paddy field work machine that can be driven.

The paddy field machine according to the present invention is:
A riding type driving unit; a main transmission that shifts the driving force from the engine; and a transmission case that inputs the driving force from the main transmission and outputs the input driving force to the traveling device and the working unit.
A sub-transmission gear mission, a work transmission gear mission, and a traveling sub-transmission gear mission housed in the mission case;
The auxiliary transmission gear mission is configured to shift and output the driving force from the main transmission to a plurality of stages,
The work transmission gear mission is configured to shift the work output branched for work out of the output of the sub transmission gear mission to a plurality of stages and output the work output to the working unit,
The travel sub-transmission gear mission is configured to shift a travel output branched for travel out of the output of the sub-transmission gear mission to a plurality of stages and to output the travel output to the travel device. To do.

  According to this configuration, the driving force from the main transmission is input to the sub-transmission gear mission, the gear is shifted, then input to the traveling sub-transmission gear mission, the gear is shifted again, and then output to the traveling device. Compared to a configuration in which the driving force from the device is shifted to a traveling device by only one gear transmission capable of multi-stage shifting and output to the traveling device, the diameter of the gears constituting the auxiliary transmission gear mission and the traveling auxiliary transmission gear mission is reduced to a small size. However, the driving force from the main transmission can be shifted in multiple stages and output to the traveling device. That is, in addition to being able to generate and output a driving force at a rotational speed suitable for work traveling and traveling traveling to the traveling device, the driving device generates a driving force at a rotational speed suitable for crossing and escape. Can be output.

  According to this configuration, the driving force from the main transmission device is input to the sub-transmission gear mission to change the speed, and then input to the work transmission gear mission, the gear is shifted again, and then output to the working unit. Although the transmission is a simple transmission structure that utilizes the gear for the work gear transmission, a multi-stage work gear stage can be obtained by combining the number of shift stages of the auxiliary transmission gear mission and the number of transmission stages of the work transmission gear mission. The driving force shifted to the working gear can be output to the working unit.

  Therefore, according to the present invention, when moving between farm fields or when the traveling device sinks into a deep mud layer, the traveling device is driven with an appropriate driving force for overpassing and escaping, making it easy and smooth to move over and escape from the heel. Can be done. It is possible to advantageously reduce the diameter of the gears constituting the gear mission, reduce the size of the mission case to a small size such as a low height, and reduce the ground height of the mission case. In addition, the work section can be driven by shifting in multiple stages with a simple mission structure utilizing the sub-transmission gear mission as a work gear mission.

  In the present invention, the riding-type driving unit includes a driving operation unit equipped with a driver's seat and a control unit equipped with a steering handle, and the sub-transmission operation tool for shifting the sub-transmission gear mission is provided with the steering control unit. It is preferable to arrange in the part.

  According to this configuration, even if a hand is attached to the steering handle, it is possible to easily and quickly reach the auxiliary transmission operation tool and operate the auxiliary transmission operation tool by moving the hand slightly from the steering handle. .

  The sub-transmission gear mission is more than the traveling sub-transmission gear mission, such as shifting the sub-transmission gear mission when switching between work travel and mobile travel, and shifting the travel sub-transmission gear mission when moving over the heel or exiting. However, according to the present invention, it is advantageous because it is easy to perform the shifting operation of the sub-transmission gear mission that frequently shifts.

  In the present invention, the riding type driving unit includes a driving operation unit equipped with a driving seat and a control unit equipped with a steering handle, and a traveling sub-transmission operation tool for shifting the traveling sub-transmission gear mission, It is preferable if it is provided in the driving operation unit.

  According to this configuration, the traveling sub-shift operating tool that shifts the traveling sub-transmission gear mission is located near the driver's seat and is unlikely to obstruct the maneuvering operation.

  Shifting the sub-transmission gear mission when switching between work travel and mobile travel, shifting the sub-transmission gear mission when moving over the heel and exiting, etc. Although there are fewer opportunities to shift the transmission, according to the present invention, the traveling sub-transmission operating tool of the traveling sub-transmission gear mission with fewer opportunities to shift is advantageous because it does not easily obstruct the maneuvering operation.

  In the present invention, the work transmission gear mission includes a pair of input gears supported on an input shaft so as to be integrally rotatable and slidable, and a pair of transmission gears in which the pair of input gears are selectively engaged. And a gear mission section that shifts the driving force of the pair of transmission gears in a plurality of stages and transmits the transmission force to the output shaft.

  According to this configuration, the work speed change gear is obtained by combining the shift speed that is expressed by the pair of input gears and the pair of speed change gears of the gear transmission part that meshes with the pair of input gears, and the speed change stage that the gear mission part has. The mission can be provided with predetermined multi-stage gear positions. In other words, it is possible to reduce the number of gears constituting the gear transmission unit as compared with a case where a work transmission gear mission is configured with only one input gear and the work transmission gear mission is provided with a predetermined multi-stage gear stage. However, the work transmission gear mission can be provided with a predetermined multi-stage shift stage.

  Therefore, according to the present invention, it is possible to shift the work unit to a multi-stage shift stage and drive it while making the work shift gear transmission compact with a small number of gears in the gear mission unit.

  In the present invention, an intermediate transmission shaft that supports the pair of transmission gears so as to rotate integrally with the gear transmission unit, a portion of the intermediate transmission shaft that is positioned between the pair of transmission gears, and the output shaft. And a gear pair for shifting the driving force of the intermediate transmission shaft and transmitting it to the output shaft.

  According to this configuration, the transmission transmission ratio between one input gear of the pair of input gears and the transmission gear of the gear transmission portion with which the input gear meshes, and the other input gear of the pair of input gears and the input gear The difference between the transmission gear ratio of the gear transmission unit and the gear transmission unit engaged with each other can be increased, and the overall shift width of the work transmission gear transmission can be increased.

  Therefore, according to the present invention, the working unit can be driven with a wide shift range, and the rice transplanter can be advantageously operated such that the plant can be planted by changing and adjusting between the plants within a wide adjustment range.

It is a side view which shows the whole paddy field machine. It is a top view which shows the whole paddy field machine. It is a diagram which shows a transmission device. It is a diagram which shows the part of the working system among transmissions. It is sectional drawing in the unfolded state which shows a subtransmission gear mission, a driving subtransmission gear mission, and a front-wheel differential mechanism. It is sectional drawing which shows a work transmission gear mission. It is a vertical side view which shows the part which accommodates the subtransmission gear mission, the traveling subtransmission gear mission, and the front-wheel differential mechanism among mission cases.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a side view showing an entire paddy field working machine according to an embodiment of the present invention. FIG. 2 is a plan view showing the entire paddy field working machine according to the embodiment of the present invention. As shown in FIGS. 1 and 2, the paddy field machine according to the embodiment of the present invention includes a pair of left and right steering operations and a front wheel 1 and 1 that can be driven as a traveling device, and a pair of left and right rear wheels 2 that can be driven. , 2, a self-propelled vehicle configured to be self-propelled, a working unit 4 connected to a rear part of a body frame 3 of the self-propelled vehicle via a link mechanism 6 that can swing up and down, and a rear part of the self-propelled vehicle And a fertilizer application device 7 deployed in the plant.

  The paddy field work machine swings the link mechanism 6 with the hydraulic cylinder 5 and lowers the working unit 4 to the lowered working state in which the grounding float 23 is grounded to the farm field so that the self-propelled vehicle travels. A six-row seedling planting operation is performed, and a fertilizer supply operation is performed by the fertilizer application device 7 to supply fertilizer to the field near the side of the six-planted seedlings.

A self-propelled vehicle will be described.
As shown in FIGS. 1 and 2, the self-propelled vehicle is provided with a riding type driving unit equipped with a driving seat 11 provided at the rear of the vehicle body. The riding-type driving unit 10 includes a driving operation unit 10A equipped with a driving seat 11 and an operation panel 12 provided on both sides of the driving seat 11, a steering handle 15 and a steering handle provided in front of the driving seat 11. 15 is provided with a control unit 10B equipped with an operation panel 16 disposed below the control panel 16.

  The self-propelled vehicle includes an engine 30 supported on the front portion of the vehicle body frame 3, and the driving force from the engine 30 is transmitted to the left and right front wheel drive cases 31 and the rear wheel drive case 32 to transmit a pair of left and right front wheels 1. , 1 and a pair of left and right rear wheels 2, 2 are driven.

The working unit 4 will be described.
As shown in FIGS. 1 and 2, the working unit 4 includes a planting machine frame 25 having a front end connected to a rear end of the link mechanism 6. The planting machine body frame 25 includes a feed case 26 connected to the rear end portion of the link mechanism 6 and three planting drive cases 27 arranged at a predetermined interval in the lateral direction of the self-propelled vehicle body.

  The working unit 4 includes six seedling planting mechanisms 22 that are supported by the lateral sides of the rear end portion of each planting drive case 27 so as to be freely driven and arranged in the lateral direction of the self-propelled machine body, and above the planting machine body frame 25. Are provided with a seedling stand 21 provided in an inclined position located rearward on the lower end side, and three grounding floats 23 provided side by side in the lateral direction of the self-propelled vehicle body below the planting machine body frame 25.

  The working unit 4 is configured to drive the seedling vertical feed belt 24 provided in the seedling placement mechanism 22, the seedling placing stand 21, and the seedling placing stand 21 of the six rows of seedling placing stands 21 as follows.

  The driving force from the engine 30 is input to the feed case 26 to branch into seedling feeding and planting, and the driving force branched for planting is transmitted to the planting driving case 27 to drive the seedling planting mechanism 22. It is configured. The driving force branched for seedling feeding is transmitted to a seedling placing table lateral feed mechanism (not shown), and the seedling placing stand 21 is reciprocated in the horizontal direction in conjunction with the seedling planting movement of the seedling planting mechanism 22. It is configured. The driving force branched for seedling feeding is transmitted to a longitudinal feeding drive mechanism (not shown) to drive the seedling longitudinal feeding belt 24.

The fertilizer application device 7 will be described.
The fertilizer applicator 7 feeds the granular fertilizer stored in the fertilizer tank 18 by a set amount by four feed mechanisms 19 that are connected to the lower portion of the fertilizer tank 18 in the horizontal direction of the vehicle body, and the fertilizer fed by each feed mechanism 19. Is supplied to the six grooving devices 29 provided in the working unit 4 in a state of being connected to the feeding mechanism 19 via the fertilizer hose 29a by the conveying air from the electric blower 28. The six grooving devices 29 are arranged on the lateral side of each seedling planting mechanism 22 and arranged in the lateral direction of the vehicle body and supported by the grounding float 23. Each grooving device 9 forms a fertilizer groove in the field near the side of the seedling planting site by the seedling planting mechanism 22 and supplies fertilizer from the fertilizer hose 29a to the formed fertilizer groove.

  The transmission A that drives the left and right front wheels 1, 1, the left and right rear wheels 2, 2 and the working unit 4 will be described.

  FIG. 3 is a diagram showing the transmission device A. FIG. 4 is a diagram showing a work system portion of the transmission device A. As shown in FIGS. 1, 2, 3, and 4, the transmission device A includes a transmission case 35 that is supported by the vehicle body frame 3 between the left and right front wheels 1, and a main body that is supported by the lateral ends of the transmission case 35. The transmission 36 includes an auxiliary transmission gear mission 40, a traveling auxiliary transmission gear mission 50, a work transmission gear mission 60, and a front wheel differential mechanism 70 housed in the transmission case 35.

  The main transmission 36 includes an axial plunger type variable displacement type hydraulic pump 36P and an axial plunger type hydraulic motor 36M driven by pressure oil from the hydraulic pump 36P, and is a hydrostatic continuously variable transmission. It is configured. The main speed change device 36 is configured to perform a speed change operation by a main speed change lever 37 as a main speed change operating tool provided in the driving operation unit 10A. The main transmission lever 37 is disposed on the operation panel 12 located on the right side of the driver seat 11 in the driver operation unit 10A so as to be swingable in the longitudinal direction of the vehicle body.

  The transmission device A inputs the driving force of the output shaft 30 a of the engine 30 to the pump shaft 36 a that is the input shaft of the main transmission device 36 via the belt transmission mechanism 39, and the motor shaft that is the output shaft of the main transmission device 36. The driving force 36b is input to the mission case 35, the driving force input to the mission case 35 is input to the sub-transmission gear mission 40, and after shifting, the driving is branched for traveling and the driving is branched for traveling. The front wheel output is branched into the front wheel and the rear wheel after being input to the traveling auxiliary transmission gear mission 50, and the front wheel output branched into the front wheel is input to the front wheel differential mechanism 70. The pair of left and right front wheel output shafts 71 and 71 of the mechanism 70 outputs to both lateral outer sides of the transmission case 35 and transmits to the pair of left and right front wheel drive cases 31 and 31. The front wheel differential mechanism 70 is configured to be able to be switched between a differential state (diff lock release) and a differential impossible state (diff lock) by a differential lock body 72 that can be engaged and disengaged with respect to the differential case. The left and right front wheel drive cases 31 extend laterally outward from the vehicle body from the lateral sides of the mission case 35. The differential lock body 72 is switched by an operation shaft 72a that can be rotated.

  The transmission A transmits the rear wheel output branched for the rear wheel after the shift by the traveling auxiliary transmission gear mission 50 to the rear wheel output shaft 35a supported on the rear portion of the transmission case 35, and from the rear wheel output shaft 35a. Then, it is output to the rear side of the transmission case 35 and transmitted to the rear wheel input shaft 32a of the rear wheel drive case 32. A rear wheel brake BR is mounted on the rear wheel output shaft 35a. The rear wheel drive case 32 is supported by the rear end portion of the vehicle body frame 3. The rear wheel output shaft 35a and the rear wheel input shaft 32a are connected by a rotation transmission shaft 35b.

  The transmission device A receives the work output branched for work after shifting by the sub-transmission gear mission 40 and inputs the work output to the work transmission gear mission 60, and then shifts the work output shaft supported by the rear portion of the transmission case 35. Is transmitted to the rear side of the mission case 35 and transmitted to the work input shaft 26a of the working unit 4 by the work output shaft 35c. A work clutch 61 is provided on the work output shaft 35c. The work output shaft 35c and the work input shaft 26a are a self-propelled vehicle-side rotation transmission shaft 35d extending from the work output shaft 35c to the rear end portion of the self-propelled vehicle, and a work extending from the rotation transmission shaft 35d to the work input shaft 26a. It is connected to the rotary transmission shaft 26b on the part side. The working portion side rotation transmission shaft 26b is connected to the self-propelled vehicle side rotation transmission shaft 35d and the work input shaft 26a via a universal joint.

The auxiliary transmission gear mission 40 will be described.
As shown in FIGS. 3 and 5, the auxiliary transmission gear mission 40 includes an input shaft 41 constituting an input shaft of the mission case 35, an output shaft 42 parallel to the input shaft 41, and integral rotation and sliding on the input shaft 41. A pair of shift gears 43.44 provided operably and a pair of transmission gears 45, 46 provided integrally with the output shaft 42 are provided. The input shaft 41 is connected to the motor shaft 36b of the main transmission 36. The pair of shift gears 43 and 44 are connected so as to slide integrally with the input shaft 41.

The sub-transmission gear mission 40 can be shifted to a two-speed state of high speed and low speed by shifting the pair of shift gears 43 and 44.
That is, the sub-transmission gear mission 40 is in a low-speed shift state when the small-diameter shift gear 43 is engaged with one of the transmission gears 45, and the driving force of the input shaft 41 is applied to the shift gear 43 and the transmission gear 45. To the output shaft.

  The sub-transmission gear mission 40 is brought into a high-speed shift state when the large-diameter shift gear 44 is engaged with the other shift gear 46, and the driving force of the input shaft 41 is transmitted via the shift gear 44 and the shift gear 46. To the output shaft 42.

  The sub-transmission gear mission 40 divides the driving force of the output shaft 42 for traveling and for working, and outputs the traveling output branched for traveling when the gear is shifted to either high speed or low speed. The work output transmitted to the transmission gear mission 50 and branched for work is transmitted to the work transmission gear mission 60.

That is, a traveling output gear 47 is provided on one end side of the output shaft 42 so as to be integrally rotatable, and a work output gear 48 is provided on the other end side of the output shaft 42 so as to be integrally rotatable.
The sub-transmission gear mission 40 is configured such that when the large-diameter shift gear 52 of the pair of shift gears 51 and 52 of the traveling sub-transmission gear mission 50 is engaged with the traveling output gear 47, the driving force of the output shaft 42 is increased. Is divided into a traveling output and a working output by the traveling output gear 47 and the working output gear 48, and the traveling output branched for traveling is transmitted from the traveling output gear 47 to the traveling auxiliary transmission gear mission 50. Then, the work output branched for work is transmitted from the work output gear 48 to the work speed change gear mission 60.

  The auxiliary transmission gear mission 40 is configured such that when the shift gear 51 on the small diameter side of the pair of shift gears 51 and 52 of the traveling auxiliary transmission gear mission 50 is engaged with the other transmission gear 46, the driving force of the output shaft 42 is supplied to the other. The transmission gear 46 and the work output gear 48 are used for branching for traveling and working, and the traveling output branched for traveling is transmitted from the other transmission gear 46 to the traveling sub-transmission gear mission 50 for working. The work output branched to is transmitted from the work output gear 48 to the work transmission gear mission 60.

  The sub-transmission gear mission 40 is configured to perform a shift operation by a sub-transmission lever 49 as a sub-transmission operation tool provided in the control unit 10B. The auxiliary transmission lever 49 is disposed at a portion of the control unit 10B on the lower left side of the steering handle 15 and near the handle post so as to be swingable in the lateral direction of the vehicle body.

The traveling auxiliary transmission gear mission 50 will be described.
The traveling subtransmission gear mission 50 includes the other transmission gear 46 and traveling output gear 47 included in the subtransmission gear mission 40, an output shaft 53 parallel to the output shaft 42 of the subtransmission gear mission 40, and an output shaft 53. A pair of shift gears 51 and 52 provided so as to be freely rotatable and slidable integrally are provided. The pair of shift gears 51 and 52 are connected so as to slide integrally with the output shaft 53.

The traveling sub-transmission gear mission 50 can be shifted to a high-speed and low-speed shift state by shifting the pair of shift gears 51 and 52.
That is, the traveling sub-transmission gear mission 50 is brought into a low-speed transmission state when the large-diameter shift gear 52 of the pair of shift gears 51 and 52 is engaged with the output gear 47 of the sub-transmission gear mission 40. The driving output branched for driving out of the driving force output from the auxiliary transmission gear mission 40 is transmitted to the output shaft 53 via the shift gear 52.

  The traveling sub-transmission gear mission 50 is brought into a high-speed transmission state when the shift gear 51 on the small diameter side of the pair of shift gears 51 and 52 is engaged with the other transmission gear 46 of the sub-transmission gear mission 40. Of the driving force output by the sub-transmission gear mission 40, the traveling output branched for traveling is transmitted to the output shaft 53 via the shift gear 51.

  The traveling sub-transmission gear mission 50 includes a front wheel output gear 54 in which the driving force of the output shaft 53 is provided on one end side of the output shaft 53 so as to be integrally rotatable in both high speed and low speed, and the output shaft 42. A rear wheel output gear 55 provided on the end side so as to be integrally rotatable is branched into a front wheel and a rear wheel, and the front wheel output branched to the front wheel is transmitted to the input gear 73 of the front wheel differential mechanism 70, so that the rear wheel The rear wheel output branched off is transmitted to a transmission gear 56 provided on the rear wheel output shaft 35a so as to be integrally rotatable.

  The travel sub-transmission gear mission 50 is configured to perform a speed change operation by a travel sub-transmission lever 57 as a travel sub-transmission operation tool provided in the driving operation unit 10A. The traveling subtransmission lever 57 is arranged on the operation panel 12 located on the left side of the driver seat 11 in the driving operation unit 10A so as to be swingable in the longitudinal direction of the vehicle body.

  Accordingly, the transmission device A switches from the first speed to the fourth speed in the four-stage sub-shift state by shifting the sub-transmission gear mission 40 and the traveling sub-transmission gear mission 50 to an appropriate shift state.

  When the transmission device A switches to the fourth speed sub-shift state, the driving force from the main transmission device 36 is sub-shifted to a driving force having a rotational speed suitable for traveling and transmitted to the front wheels 1 and the rear wheels 2. To do.

  When the transmission device A switches to the third speed sub-shift state, the driving force from the main transmission device 36 has a rotational speed suitable for work travel, and is higher than the rotational speed in the fourth speed sub-shift state. Sub-shifting to a low rotational speed is transmitted to the front wheel 1 and the rear wheel 2.

  When the transmission device A switches to the second speed sub-transmission state, the transmission device A has a rotational speed suitable for traveling over the driving force from the main transmission device 36, and is based on the rotational speed in the third speed sub-transmission state. Is also sub-shifted to a low rotational speed and transmitted to the front wheel 1 and the rear wheel 2.

  When the transmission device A switches to the first speed sub-shift state, the driving force from the main transmission device 36 has a rotational speed suitable for escape running, which is higher than the rotational speed in the second speed sub-shift state. Sub-shifting to a low rotational speed is transmitted to the front wheel 1 and the rear wheel 2.

The work transmission gear mission 60 will be described.
As shown in FIGS. 4 and 6, the work transmission gear mission 60 includes an input shaft 62 that is transmitted from the work output gear 48 of the auxiliary transmission gear mission 40 via the torque limiter T, and an intermediate parallel to the input shaft 62. A transmission shaft 63 and an output shaft 64, a pair of input gears 65 and 66 provided on the input shaft 62 so as to be integrally rotatable and slidable, and a gear mission section 80 provided across the intermediate transmission shaft 63 and the output shaft 64. It is prepared. The intermediate transmission shaft 63 is supported by the input shaft 41 of the auxiliary transmission gear mission 40 so as to be relatively rotatable.

  The pair of input gears 65 and 66 are connected so as to slide integrally with the input shaft 62. The large-diameter input gear 65 of the pair of input gears 65, 66 is a gear shift of the five transmission gears 81 to 85 that are supported by the intermediate transmission shaft 63 side by side in the axial direction of the intermediate transmission shaft 63. It is configured to be engaged with and disengaged from the transmission gear 81 located on the outermost side at one end side in the gear parallel direction. The small-diameter input gear 66 of the pair of input gears 65 and 66 is engaged with and disengaged from the transmission gear 85 located on the outermost side at the other end side in the transmission gear parallel direction of the five transmission gears 81 to 85. It is constituted as follows.

  The gear transmission unit 80 includes five transmission gears 81 to 85 that are supported by the intermediate transmission shaft 63 side by side in the axial direction of the intermediate transmission shaft 63 and four output gears 86 to 89 that are supported by the output shaft 64. It is prepared.

  Of the five transmission gears 81 to 85 supported by the intermediate transmission shaft 63, the other four transmission gears 81 to 84 except the transmission gear 85 that engages and disengages the small-diameter input gear 66 are supported by the output shaft 64. The four output gears 86 to 89 mesh with each other. Therefore, the four transmission gears 81 to 84 of the intermediate transmission shaft 63 and the four output gears 86 to 89 of the output shaft 64 are four gear pairs G1 to G1 provided across the intermediate transmission shaft 63 and the output shaft 64. G4 is configured. Of the four gear pairs G1 to G4, three gear pairs G2 to G4 include a transmission gear 81 that engages and disengages the large-diameter input gear 65 and a small-diameter input gear 66 of the intermediate transmission shaft 63. It is located in the part located between the transmission gear 85 to be removed.

  The five transmission gears 81 to 85 supported by the intermediate transmission shaft 63 are supported by the intermediate transmission shaft 63 so as to be integrally rotatable. The four output gears 86 to 89 supported by the output shaft 64 are supported by the output shaft 64 so as to be relatively rotatable. A clutch ball 90 that engages and disengages in a notch recess provided in an inner peripheral portion of the four output gears 86 to 89 is integrally rotatable on a cylindrical shaft portion that supports the four output gears 86 to 89 of the output shaft 64. It is supported. The clutch ball 90 is inserted into the notch recess inside the cylindrical shaft portion of the output shaft 64, and the four output gears 86 to 89 are selectively engaged with the output shaft 64 so as to be integrally rotatable. A shift key 91 is provided.

  Accordingly, the work transmission gear mission 60 is operated to slide the pair of input gears 65 and 66 by the freely-movable transmission operation shaft 67 to engage and disengage the pair of transmission gears 81 and 85 of the intermediate transmission shaft 63. Then, the shift key 91 is slid by the shift operation shaft 92 connected to the one end side of the shift key 91 to selectively engage the four output gears 86 to 89 with the output shaft 64 so as to be integrally rotatable. Thus, the working driving force transmitted from the auxiliary transmission gear mission 40 is shifted in eight stages and transmitted to the work output shaft 35c.

  In other words, when the large-diameter input gear 65 is engaged with the transmission gear 81, the driving force of the input shaft 62 that is transmitted from the working output gear 48 of the auxiliary transmission gear mission 40 and rotates is input to the input gear. The speed is changed by 65 and the transmission gear 81 and transmitted to the intermediate transmission shaft 63. When the small-diameter side input gear 66 is engaged with the transmission gear 85, the driving force of the input shaft 62 is changed between the large-diameter side input gear 65 and the transmission gear 81 by the input gear 66 and the transmission gear 85. The gear is shifted at a gear ratio different from the gear ratio provided and transmitted to the intermediate transmission shaft 63. The rotational speed of the intermediate transmission shaft 63 when the large-diameter input gear 65 is engaged with the transmission gear 81 is higher than the rotational speed when the small-diameter input gear 66 is engaged with the transmission gear 85. become.

  The four gear pairs G1 to G4 are selectively switched between the transmission on state and the transmission cut off state by the engagement / disengagement operation of the output gears 86 to 89 with respect to the output shaft 64, and are switched to the transmission on state. The driving force of the intermediate transmission shaft 63 is shifted by the gear ratio provided in each gear pair G1 to G4 and transmitted to the output shaft 64. The gear ratios of the four gear pairs G1 to G4 are different, and the rotational speed of the output shaft 64, which is rotated by the intermediate transmission shaft 63 and the output shaft 64 being interlocked by the gear pairs G1 to G4, is different from that of the intermediate transmission shaft 63. The difference is that the gear pairs G1 to G4 that link the output shaft 64 are different.

  In other words, the work transmission gear mission 60 shifts the work output output from the sub-transmission gear mission 40 to eight stages and transmits it to the working unit 4, thereby increasing the space between the planting seedling stocks by the six seedling planting mechanisms 22. Change to the size of the type.

  FIG. 7 is a longitudinal side view showing a portion of the transmission case 35 that houses the auxiliary transmission gear mission 40, the traveling auxiliary transmission gear mission 50, and the front wheel differential mechanism 70. As shown in FIG. 7, the input shaft 41 and the output shaft 42 of the auxiliary transmission gear mission 40 and the output shaft 53 of the traveling auxiliary transmission gear mission 50 are arranged obliquely above the front wheel output shaft 71 of the front wheel differential mechanism 70. The sub-transmission gear transmission 40, the traveling sub-transmission gear mission 50, and the front-wheel differential mechanism are positioned so that the output shaft 53 of the traveling sub-transmission gear mission 50 is positioned rearwardly and upwardly of the front wheel output shaft 71 of the front-wheel differential mechanism 70. 70 is accommodated in the mission case 35.

[Another Example]
(1) In the above-described embodiment, an example is shown in which the auxiliary transmission gear mission 40 and the traveling auxiliary transmission gear mission 50 are configured to be freely variable in two stages, but may be configured to be variable in three or more stages. .

(2) In the above-described embodiment, the example in which the work transmission gear mission 60 is provided with the four gear pairs G1 to G4 has been described, but may be implemented with three or five or more gear pairs.

(3) In the above-described embodiment, in the gear transmission unit 80, the transmission gears 82 to 84 supported by the intermediate transmission shaft 63 are connected to the intermediate transmission shaft 63 so as to be integrally rotatable and supported by the output shaft 64. Although an example in which the output gears 86 to 89 are configured to be engaged / disengaged with respect to the output shaft 64 has been shown, the transmission gear supported by the intermediate transmission shaft 63 is engaged / disengaged with respect to the intermediate transmission shaft 63 to output The output gear supported by the shaft 64 may be configured to be connected to the output shaft 64 so as to be integrally rotatable.

  INDUSTRIAL APPLICABILITY The present invention can be used for a paddy field work machine provided with a work part configured to perform seeding work as well as a paddy field work machine provided with a work part configured to perform seedling planting work.

1 Traveling device (front wheel)
2 Traveling devices (rear wheels)
DESCRIPTION OF SYMBOLS 4 Working part 10 Passenger type driving part 10A Driving operation part 10B Steering part 11 Driving seat 15 Steering handle 30 Engine 35 Transmission case 36 Main transmission 40 Subtransmission gear mission 49 Subtransmission operating tool 50 Traveling subtransmission gear mission 57 Traveling subtransmission Operation tool 60 Work transmission gear transmission 62 Input shaft 63 Intermediate transmission shaft 64 Output shaft 65, 66 Input gear 80 Gear transmission section 81, 85 Transmission gear G2, G3, G4 Gear pair

Claims (5)

A riding type driving unit; a main transmission that shifts the driving force from the engine; and a transmission case that inputs the driving force from the main transmission and outputs the input driving force to the traveling device and the working unit.
A sub-transmission gear mission, a work transmission gear mission, and a traveling sub-transmission gear mission housed in the mission case;
The auxiliary transmission gear mission is configured to shift and output the driving force from the main transmission to a plurality of stages,
The work transmission gear mission is configured to shift the work output branched for work out of the output of the sub transmission gear mission to a plurality of stages and output the work output to the working unit,
The paddy field work machine configured to shift the traveling output branched for traveling out of the output of the auxiliary transmission gear mission to a plurality of stages and output the traveling auxiliary transmission gear mission to the traveling device. The riding type driving unit includes a driving operation unit equipped with a driver's seat and a steering unit equipped with a steering handle,
The paddy field work machine according to claim 1, wherein a sub-transmission operation tool that shifts the sub-transmission gear mission is provided in the control unit. The riding type driving unit includes a driving operation unit equipped with a driver's seat and a steering unit equipped with a steering handle,
The paddy field work machine according to claim 1 or 2, wherein a traveling sub-shift operating tool that shifts the traveling sub-transmission gear mission is provided in the driving operation unit.   The work transmission gear transmission is provided with a pair of input gears that are supported on an input shaft so as to be integrally rotatable and slidable, and a pair of transmission gears that are selectively engaged with the pair of input gears. The paddy field work machine according to any one of claims 1 to 3, further comprising a gear transmission unit that shifts the driving force of the pair of transmission gears to a plurality of stages and transmits the transmission force to the output shaft.   The gear transmission section is provided across an intermediate transmission shaft that supports the pair of transmission gears so as to be integrally rotatable, a portion of the intermediate transmission shaft that is positioned between the pair of transmission gears, and the output shaft. The paddy field work machine according to claim 4, further comprising: a gear pair that shifts and transmits the driving force of the intermediate transmission shaft to the output shaft.

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