JP5387143B2 - Leveling device - Google Patents

Description

  The present invention belongs to the technical field of a leveling device attached to a work machine such as a farm work machine such as a tractor or a rice transplanter.

  There is a rice transplanter provided with a leveling device on the rear side of the traveling vehicle body and on the front side of the seedling planting part. The leveling device is provided with a drive shaft that is driven and rotated by the power in the rotor transmission case in the left-right direction so as to protrude from the drive shaft bearing portion of the rotor transmission case, and a leveling rotor that is rotated by driving of the drive shaft is provided. The rotor includes a mounting boss portion for mounting on the drive shaft side, a leveling plate that contacts the soil surface and applies a leveling action, and a connecting portion that connects the mounting boss portion and the leveling plate (see Patent Document 1). .

JP 2007-195417 A

In this type of leveling device, impurities such as flaws enter the drive shaft side from the left and right ends of the leveling rotor, that is, between the left and right ends of the leveling plate and the rotor transmission case, and by rotation of the drive shaft, There is a possibility that the foreign matter that has entered may be wound around the drive shaft or the mounting boss , and it is necessary to remove the foreign matter that has been wound during maintenance or the like , resulting in poor maintenance .

In order to solve the above problems, the following technical measures were taken.
That is, the invention comprises a central leveling rotor and (27b) provided between the left and right of the right and left rotor transmission case (73), the side on the left and right outside of the left and right rotor transmission case (73, 73) according to claim 1 Leveling rotors (27a, 27a) are respectively provided on the left and right, and first drive shaft bearings (first drive shaft bearings) that receive the first drive shaft (70b) for rotating the center leveling rotor (27b) in the left and right rotor transmission cases (73, 73). 99) and second drive shaft bearings (99, 99) for receiving the second drive shafts (70a, 70a) for rotating the side leveling rotors (27a, 27a), and the left and right rotor transmission cases (73) 73), a transmission bevel gear (102) and a transmission shaft (103) are provided, and an oil seal (109) is provided in the first drive shaft bearing (99), and the oil seal (109) The The right rotor transmission case (73, 73) is not exposed to the outside, and the central leveling rotor (27b) and the left and right side leveling rotors (27a, 27a) are connected to the first drive shaft (70b) or left and right a mounting boss for mounting the second drive shaft (70a, 70a) (104a) , leveling plates for leveling grounded soil surface and (104b), said mounting boss (104a) and leveling plate ( 104b) is composed of a plurality of rotor pieces (104) composed of connecting portions (104c), and left and right foreign matter winding preventing portions (95 ) are provided at the front end portions of the left and right rotor transmission cases (73, 73). 95) projecting inward in the left-right direction, and forming left and right projecting portions 96, 96 on the rear side of the left and right foreign matter winding prevention portions 95, 95 and the central leveling rotor 27b. Forming each of the Contaminants winding prevention of the right to attach the rotor cover (98) over the protruding portions of the left and right from the (95, 95) (96, 96), the right and left contaminants wrap preventing portion (95, 95) , forward and together to overlap with the left-right direction end portions of the leveling plate (104b) in a front view of the aircraft of the ground leveling plate (104b), said first drive shaft bearing portion (99), leveling plate in a front view of the aircraft The leveling device is characterized by overlapping with the left and right end portions of (104b) .

According to a second aspect of the present invention, the first drive shaft (70b) is mounted with a drive base shaft (105) provided on the first drive shaft bearing portion (99) and the plurality of rotor pieces (104). The ground leveling device according to claim 1, wherein the leveling device is configured by being connected to a drive pipe (106) .

According to the invention of claim 1, ground leveling plate in front of the machine body space in the left-right direction ends left contaminants wrap preventing portion (104b) with being blocked by the (95, 95), leveling plate (104b) The first drive shaft bearing portion (99) prevents the first drive shaft (70b) and the mounting boss portion (104a) from being exposed outside in the left and right direction of the left and right ends of the leveling plate (104b). the first left and right drive shaft from between the rotor transmission case (73,73) (70b) and the mounting boss portion (104a) to contaminants such as straw easily enter Runode, contaminants first drive shaft (70b ) And the mounting boss portion (104a) are prevented from being wound, and the maintainability is improved.
Further, the oil seal (109) provided in the first drive shaft bearing portion (99) is provided so as not to be exposed to the outside from the left and right rotor transmission cases (73, 73), so that the oil seal (109) is contaminated. Since the object can be prevented from being wound, leakage of the lubricating oil due to damage to the oil seal (109) is prevented.

According to the invention of claim 2, in addition to the effect of the invention of claim 1, the first drive shaft (70b) is connected to the drive base shaft (105) and the drive pipe (106) to which the plurality of rotor pieces (104) are attached. ), The first drive shaft (70) and the plurality of rotor pieces (104) can be integrally rotated.

Side view of rice transplanter Top view of rice transplanter Side view showing the leveling device Rear view showing the leveling device Cross-sectional plan view showing the leveling device Cross-sectional plan view showing the drive mechanism of the leveling device Cross-sectional plan view showing the rotor transmission case

One embodiment of the present invention will be described below.
FIGS. 1 and 2 are a side view and a plan view of a riding type rice transplanter equipped with a fertilizer application device as a granular material feeding device. In this riding type rice transplanter 1 with a fertilizer application, a seedling planting part 4 as a working part is mounted on the rear side of the traveling vehicle body 2 via a lifting link device 3 so as to be movable up and down. 5 main body portions are provided.

  The traveling vehicle body 2 is a four-wheel drive vehicle including a pair of left and right front wheels 10 and 10 and a pair of left and right rear wheels 11 and 11 as drive wheels, and a transmission case 12 is disposed at the front of the fuselage. Front wheel final cases 13, 13 are provided on the left and right sides of the case 12, and the left and right front wheels are mounted on the left and right front wheel axles projecting outward from the respective front wheel support portions capable of changing the steering direction of the left and right front wheel final cases 13, 13. 10 and 10 are respectively attached. Further, the front end portion of the main frame 15 is fixed to the rear portion of the transmission case 12, and a rear wheel gear case 18, with a rear wheel rolling shaft provided horizontally in the front and rear sides at the rear left and right center of the main frame 15 as a fulcrum. The rear wheels 11 and 11 are attached to a rear wheel axle that is supported in a freely rolling manner and projects outwardly from the rear wheel gear cases 18 and 18.

  The engine 20 is mounted on the main frame 15, and the rotational power of the engine 20 is transmitted to the transmission case 12 via a belt transmission 21 and a hydraulic continuously variable transmission 23. The rotational power transmitted to the mission case 12 is shifted by a transmission in the case 12 and then separated into traveling power and external power to be extracted. A part of the traveling power is transmitted to the front wheel final cases 13 and 13 to drive the front wheels 10 and 10, and the rest is transmitted to the rear wheel gear cases 18 and 18 to drive the rear wheels 11 and 11. Further, the external take-out power is transmitted to a planting clutch case 25 provided at the rear part of the traveling vehicle body 2, and then transmitted to the seedling planting unit 4 by the planting transmission shaft 26, and also the fertilizer application device 5 by the fertilization transmission mechanism 28. Is transmitted to.

  The upper part of the engine 20 is covered with an engine cover 30, and a seat 31 is installed thereon. A front cover 32 incorporating various operation mechanisms is provided in front of the seat 31, and a handle 34 serving as a steering means for steering the front wheels 10 is provided above the front cover 32. The engine cover 30 and the front cover 32 have horizontal floor steps 35 on the left and right sides of the lower end. The floor step 35 is partly grid-shaped (see FIG. 2), and mud on the shoe of the worker walking through the step 35 falls on the field. The rear part on the floor step 35 is a rear step 36 that also serves as a rear wheel fender. Further, on the outer side in the left and right direction of the rear wheel 11, there is provided a rotating step 111 that rotates up and down around a longitudinal axis. When the rotating step 111 is not used, as shown in FIG. It pivots downward so as to extend downward from the rear step 36 and serves as a guard that prevents the operator from getting caught in the rear wheel 11. When pivoted upward and fixed, as shown in FIG. Positioned outside, the operator can easily replenish seedlings on the seedling stage 51, particularly the left and right outermost strips of the seedling stage 51 by placing his / her feet on the rotary step 111. In addition, a grip grip 112 is provided that protrudes from the left and right side surfaces of the front cover 32 to the left and right sides, so that an operator can easily get on the floor step 35 from the front of the machine body such as a bag by gripping the grip grip 112. . Since the grip grip 112 is provided on the left and right inner sides of the left and right spare seedling platforms 38, a spare seedling platform is provided at the time of seedling replenishment work for an operator traveling between the preliminary seedling platform 38 and the seedling platform 51. As a guide for discriminating the position 38, the seedling replenishment work can be facilitated. The function of the grip grip 112 can be enhanced by attaching a cup holder, an umbrella holder or the like to the grip grip 112.

  A headlamp 114 is provided at the front of the front cover 32 to illuminate the front of the aircraft at night. A reflector 115 that reflects light is provided so as to cover the rear side of the headlamp 114, and the shape of the reflector 115 is configured so that the light of the headlamp 114 illuminates the front of the aircraft efficiently. While providing a light passage part such as a hole for passing light and a transparent lens in a part of the reflecting plate, a part of the rear surface of the front cover 32 near the operator's feet is made a transparent part, and the light passing through the light passage part is transmitted. The light is reflected on the transparent portion through the foot reflector 116 provided in the front cover 32 to illuminate the operator's feet, and the safety of the operation can be enhanced, and a special light that illuminates the workers' feet. No need for cost reduction. If the light reflecting part 116 does not use the foot reflecting plate 116 but directly illuminates the operator's foot through the transparent part, the foot reflecting plate 116 becomes unnecessary and the cost is further reduced. Can be planned.

  An indicator body 29 is provided at the front end of the aircraft as an index of the center position of the aircraft. The seedling reduction sensor 117 of the seedling platform 51 has a seedling reduction sensor 117 at the upper end of the index body 29. A notification lamp is provided that turns on when it is detected that the amount has decreased below a predetermined amount. The index body 29 can be rotated back and forth with the lower end as a fulcrum, and is tilted forward during normal work so that the left and right center position of the machine body in the field can be easily recognized. When the indicator body 29 is rotated rearward and the upper end of the indicator body 29 approaches the monitor panel 33 on the upper surface of the front cover 32, the notification lamp is turned on regardless of the decrease in seedlings. Thereby, the monitor panel 33 can be illuminated with the light of the notification lamp, and the monitor panel 33 can be easily seen at night.

  The hydraulic continuously variable transmission 23 is shifted by a main transmission lever 16 provided on the right side of the handle 34. On the other hand, by changing the transmission gear in the transmission case 12, a sub-shift lever 90 that switches between three stages: a low working speed used during normal planting work, a high road traveling speed used during road traveling, and a neutral speed that cuts off transmission. Is provided below the handle 34.

  In addition, on both the left and right sides of the front part of the traveling vehicle body 2, a spare seedling stage 38 on which replenishment seedlings are placed is provided so as to be pivotable between a position projecting laterally from the machine body and a position accommodated inside. ing. The elevating link device 3 has a parallel link configuration, and includes one upper link 40 and a pair of left and right lower links 41, 41. These links 40, 41, 41 are pivotally attached to a rear-view portal-shaped link base frame 42 erected on the rear end of the main frame 15, and a vertical link 43 is connected to the tip side thereof. ing. And the connecting shaft 44 rotatably supported by the seedling planting part 4 is inserted and connected to the lower end part of the vertical link 43, and the seedling planting part 4 is connected so as to be able to roll around the connecting shaft 44. An elevating hydraulic cylinder 46 is provided between a support member fixed to the main frame 15 and a tip of a swing arm (not shown) integrally formed with the upper link 40, and the cylinder 46 is expanded and contracted by hydraulic pressure. The upper link 40 pivots up and down, and the seedling planting part 4 moves up and down while maintaining a substantially constant posture.

  The seedling planting section 4 has a six-row planting structure, a seedling planting transmission case 50 that also serves as a frame, a mat seedling, and a left and right reciprocating motion to supply seedlings to each seedling outlet 51a one by one. When all seedlings for one row are supplied to the seedling outlet 51a, the seedling mount 51 for transferring the seedling downward by the seedling feeding belt 51b, the seedling planting device 52 for planting the seedling supplied to the seedling outlet 51a in the field, It includes a pair of left and right line drawing markers that draws the aircraft path in the process to the topsoil surface. The seedling mounting platform 51 is guided by a support roller 65a of a rectangular support frame 65 whose base is fixed to the transmission case 50 and a seedling receiving plate 91 that forms a seedling outlet 51a, and slides left and right. It is. In the lower part of the seedling planting part 4, a center float 55 is provided in the center, and side floats 56 are provided on the left and right sides thereof. If these floats consisting of the center float 55 and the side float 56 are grounded on the mud surface of the field, the float moves while leveling the mud surface, and the seedling planting device 52 is placed on the leveling trace. Seedlings are planted. Each float is pivotally attached so that the front end side moves up and down according to the unevenness of the soil surface of the field, and the vertical movement of the front part of the center float 55 is detected by the angle-of-attack control sensor during planting work, The seedling planting depth is always maintained constant by switching the hydraulic valve that controls the lifting hydraulic cylinder 46 according to the detection result to raise and lower the seedling planting unit 4.

  A resin sound absorbing material 113 is attached to the rear surface of the seedling table 51. As a result, it is possible to suppress the noise generated from the engine 20 from being reflected through the water surface of the farm field and the seedling stand 51 in a tilted front posture and reaching the worker in the seat 31, thereby maintaining a good working environment. it can.

  The fertilizer applicator 5 feeds the granular fertilizer stored in the fertilizer hopper 60 by a certain amount by the feeding unit 61, and applies the fertilizer to the left and right sides of the float (center float 55 and side float 56) with the fertilizer hose 62. It guides to the guide 92 and drops it into the fertilization structure formed in the vicinity of the side part of the seedling planting line by the groove body 93 provided on the front side of the fertilization guide 92. The air generated by the blower 58 driven by the blower electric motor 53 is blown into the fertilizer hose 62 via the air chamber 59 that is long in the left-right direction so that the fertilizer in the fertilizer hose 62 is forcibly conveyed by wind pressure. It has become.

  In addition, as shown in FIG. 1, you may provide the air suction device 118 for correcting the direction of the leaf of a seedling on the seedling mounting stand 51. FIG. Thereby, the direction of the leaves of the seedlings on the seedling mount 51 can be corrected appropriately, and the seedlings can be planted in an appropriate planting posture by the seedling planting device 52. Conventionally, planting work is sometimes performed using rolled seedlings wound for transportation and the like, but even if the seedlings are spread and expanded on the seedling mounting platform 51, the seedlings can be rolled up to spread the seedlings. There is a possibility that the leaves will be in a lying posture or in an inappropriate direction, and seedlings cannot be planted properly. In particular, if the leaves of the seedlings are tilted to the rear side (the seedling planting device 52 side), the seedling picking claws 52a of the seedling planting device 52 can easily damage the seedling leaves and scrape off the seedling floor well. It becomes difficult.

  On the rear side of the traveling vehicle body 2 and on the front side of the seedling planting unit 4, a leveling device 94 including a leveling rotor for leveling and leveling the mud surface where the field is disturbed is provided. The leveling rotor includes a side leveling rotor 27a disposed in front of each of the left and right side floats 56 and a center leveling rotor 27b disposed in front of the center float 55.

Here, the support structure of the leveling rotor 27 will be described.
A beam member 66 rotatably supported at the tip of a left and right arm 65c having a base fixed to the support frame 65 of the seedling stage 51, a left and right support arm 67 fixed to both ends of the beam member 66, and the support arm 67 Left and right leveling rotor support frames 68 are provided, each of which is rotatably attached. A drive shaft 70a of the side leveling rotor 27a is rotatably supported and attached to the lower end of the leveling rotor support frame 68. Also, near the lower end portion of the leveling rotor support frame 68, left and right connecting members 71 whose base portions are rotatably attached to the transmission case 50 are connected.

  Further, the central leveling rotor 27 b in front of the center float 55 is disposed in front of the left and right side leveling rotors 27 a in front of the side float 56. That is, left and right rotor transmission cases 73 are arranged from the inside of each of the drive shafts 70 a of the side leveling rotor 27 a toward the front of the machine body, and the drive shaft 70 b of the central leveling rotor 27 b is pivoted between the left and right rotor transmission cases 73. In addition, a central leveling rotor 27b is provided.

  Then, power is transmitted from the gear in the rear wheel gear case 18 of the left rear wheel 11 to the drive shaft 70a of the left side leveling rotor 27a via the universal joint 72, and the left rotor transmission case is transmitted from the drive shaft 70a. 73 is transmitted to the drive shaft 70b of the central leveling rotor 27b by the transmission shaft 103 in 73, and the drive shaft 70a of the right side leveling rotor 27a is transmitted from the drive shaft 70b to the drive shaft 103 in the right rotor transmission case 73. It is the structure which transmits motive power to.

  The foreign matter winding preventing portion 95 is formed integrally with the front portions of the left and right rotor transmission cases 73, and is provided so as to protrude inward in the left and right direction of the machine body so as to be positioned in front of the center leveling rotor 27b. A rotor cover 98 of the central leveling rotor 27b is fixed to the protrusion 96 of the rotor transmission case 73 located on the rear side of the foreign matter winding prevention part 95 and the central leveling rotor 27b via fixing bolts 97. Yes. In addition, the rotor cover 98 of the left and right side leveling rotor 27 a is fixed to a protruding portion 96 provided at the rear portion of the rotor transmission case 73 via fixing bolts 97. The drive shaft bearing 99 is integrally formed with the rotor transmission case 73, and is on the left side of the rear portion of the left rotor transmission case 73 and on the right side of the front portion of the left rotor transmission case 73. The drive shaft 70 b is provided on the drive shaft 70 b which is the left side of the front portion of the right rotor transmission case 73 and the drive shaft 70 a which is the right side of the rear portion of the left rotor transmission case 73.

  A transmission configuration in the rotor transmission case 73 will be described. The transmission in the left rotor transmission case 73 will be described. The drive shaft 70a of the left side ground leveling rotor 27a is driven from the input shaft 100 transmitted through the universal joint 72 through the pair of input bevel gears 101. Further, the power is transmitted from the drive shaft 70 a to the transmission shaft 103 extending forward through the transmission bevel gear 102, and the drive shaft 70 b of the central leveling rotor 27 b is driven from the front end portion of the transmission shaft 103 through the transmission bevel gear 102. Furthermore, it inputs into the right rotor transmission case 73 from the right end of this drive shaft 70b. The transmission in the right rotor transmission case 73 will be described. The power is transmitted from the drive shaft 70b to the transmission shaft 103 extending rearward through the transmission bevel gear 102, and from the rear end portion of the transmission shaft 103 through the transmission bevel gear 102. The drive shaft 70a of the right side leveling rotor 27a is driven.

  A support member 77 in the vertical direction is rotatably connected to the tip of the link member 76 whose base is fixed to the beam member 66, and any of the plurality of engagement holes 77 a, 77 b, 77 c provided in the support member 77 is connected. The front part of the center leveling rotor 27b is suspended from the center part in the left-right direction via a spring 78 with the upper part engaged.

Next, the structure which operates the leveling rotor 27 to a vertical position adjustment and a storage position is demonstrated.
A pivot pin 81b is fixed toward the front of the machine body on a U-shaped attachment body 80a provided at the center of the support frame 65 of the seedling stage 51 in the left-right direction and fixed downward. A leveling rotor vertical position adjusting lever 81 is pivotally supported on the pin 81b so as to be rotatable in the left-right direction of the machine body. Further, a bent piece 82 is fixed to the lower end portion of the leveling rotor vertical position adjusting lever 81, and when the leveling rotor vertical position adjusting lever 81 is rotated in the left-right direction of the machine body, both sides of the support frame 65 are arranged. The bent piece 82 is rotated up and down by coming into contact with the protrusion 66a fixed to the beam member 66 rotatably supported by the member 65b from below. Since the bent piece 82 is in contact with the lower portion of the projecting portion 66a, the projecting portion 66a rotates the ground leveling rotor vertical position adjusting lever 81 in the right direction of the machine body (S direction), so that the beam member 66 is moved upward. Rotates as the center. Since the left and right support arms 67 and the left and right leveling rotor support frames 68 are moved upward by the upward rotation of the beam member 66, the left and right side leveling rotors 27a are moved upward and the beam member 66 has a base portion. The link member 76 and the support member 77 to which are fixed are also moved upward, and the front portion of the center leveling rotor 27b is also moved upward via the spring 78.

  On the contrary, when the leveling rotor up / down position adjusting lever 81 is rotated leftward, the bent piece 82 is separated from the lower side of the projecting portion 66a, so that the projecting portion 66a is centered on the beam member 66 downward with the weight of the leveling rotor 27. Rotate. Since the left and right support arms 67 and the left and right leveling rotor support frames 68 move downward by the downward rotation of the beam member 66, the left and right side leveling rotors 27a move downward and the beam member 66 The link member 76 and the support member 77 to which the base portion is fixed also move downward, and the front portion of the center leveling rotor 27b also moves downward via the spring 78.

  The leveling rotor up / down position adjusting lever 81 is disposed between the steering seat 31 and the seedling mount 51 at the center (or substantially the center) of the seedling planting portion 4 and faces the seat 31 side. In addition, since the operation direction is the left-right direction of the machine body, it is easy to operate when the leveling rotor is moved up and down, and in the front-rear direction of the machine body on the front side of the seedling stage 51. It can be arranged in a narrow space and the length of the aircraft can be shortened. Furthermore, the balance of the aircraft is good and the right seedling transplanting work can be performed. Further, since the leveling rotor vertical position adjusting lever 81 can be operated even when the seedling planting portion 4 is lowered in the seedling transplanting operation state, appropriate vertical height adjustment can be performed.

  Further, in order to move the leveling rotor to the storage position where the leveling action does not occur, if the leveling rotor vertical position adjusting lever 81 is operated to the right (to the storage operation position), the same operation as the upward operation of the leveling rotor 27 is performed. The leveling rotor can be moved to the storage position, that is, to the back side of the seedling stage 51 so as to be stored. Reference numeral 81a denotes a lever guide for the leveling rotor vertical position adjusting lever 81, which is provided with an engaging groove for engaging and fixing the lever at the operating position when the lever is operated. The vertical height adjustment of the leveling rotor 27 by the leveling rotor vertical position adjusting lever 81 is performed at the same time when the rear rotation fulcrum of the floats 55 and 56 is moved up and down to change the seedling planting depth. It is intended to enable proper leveling.

  In particular, in order to keep the seedling planting depth constant at the time of planting work, the center float 55 that functions as a sensor for controlling the raising and lowering of the seedling planting unit 4 has a long front and rear length and a ground contact area. If it is not long in the front-rear direction, appropriate raising / lowering control of the seedling planting part 4 cannot be performed. Accordingly, the central leveling rotor 27b in front of the center float 55 is configured to be positioned in front of the fuselage with respect to the side leveling rotor 27a in front of the side float 56. However, the central leveling rotor 27b and the side leveling rotor 27a And a left-and-right rotor transmission case 73 that is a power transmission mechanism, and a single vertical movement mechanism that is operated by a leveling rotor vertical position adjustment lever 81 can perform vertical adjustment and move to a storage position. Therefore, it is possible to obtain a rice transplanter with a leveling device that is simple in construction and light in weight, and exhibits excellent running performance in paddy fields due to its light weight, so that a good seedling transplanting operation can be performed.

  However, since the central leveling rotor 27b in front of the center float 55 having a longer front-rear length and a longer ground contact area in the front-rear direction is disposed between the left and right rear wheels 11, the overall length of the aircraft is reduced. The central leveling rotor 27b is located below the left and right lower links 41 of the lifting link device 3, and when the seedling planting part 4 is to be raised, the central leveling rotor 27b collides with the left and right lower links 41. There is a problem that the seedling planting part 4 cannot be raised.

  Therefore, the central leveling rotor 27b located in front of the center float 55 has a front portion of the central leveling rotor 27b via a spring 78 whose upper portions are engaged with engagement holes 77a, 77b, 77c provided in the support member 77. It has a suspended configuration. Therefore, when the seedling planting part 4 is lowered and the seedling planting operation is performed while leveling with the leveling rotor 27, the center leveling rotor 27b has the spring 78 slightly extended by its weight so that it is as high as the left and right leveling rotor 27a. Therefore, when the seedling planting part 4 is raised, the upper surface of the center leveling rotor 27b comes into contact with the left and right lower links 41, 41, and the seedling planting part 4 rises. Accordingly, the spring 78 is greatly extended and the center leveling rotor 27b is changed to a posture facing downward, so that the seedling planting portion 4 can be raised without hindrance.

  If the center leveling rotor 27b is different in height from the side leveling rotor 27a when the seedling planting part 4 is lowered due to a manufacturing error of the spring 78 or a weight error of the center leveling rotor 27b, the spring The engagement holes 77a, 77b and 77c for engaging the upper part of 78 are changed, and the vertical height of the central leveling rotor 27b is adjusted so that the central leveling rotor 27b becomes the same height as the side leveling rotor 27a. Smooth terrain work.

  On the other hand, the left and right rotor transmission cases 73 are positioned between the center float 55 and the left and right rear wheels 11, so that the mud lifted by the left and right rear wheels 11 falls on the center float 55. Therefore, since the front part of the center float 55 moves up and down appropriately following the mud surface, the seedling planting part 4 is appropriately lifted and controlled to perform a good seedling planting operation.

  By the way, the leveling rotor is constituted by connecting a plurality of rotor pieces 104 to the left and right. The rotor piece 104 is made of resin and has a mounting boss 104a for mounting on the drive shafts 70a and 70b side, a leveling plate 104b for grounding the soil surface and applying a leveling action, a mounting boss 104a and a leveling plate 104b. Is provided with a connecting portion 104c. The drive shafts 70 a and 70 b are configured by a drive base shaft 105 protruding from the drive shaft bearing portion 99 of the rotor transmission case 73 and a drive pipe 106 fitted to the outer peripheral side of the drive base shaft 105. The distal end portion 105a is fitted into the end portion 106a having an oblong hole of the drive pipe 106, and the drive base shaft 105 and the drive pipe 106 are rotated together. The drive pipe 106 is attached to the drive base shaft 105 so as not to move left and right by a mounting bolt 107 serving as a connecting shaft that penetrates the distal end portion 105 a of the drive base shaft 105 and the end portion 106 a of the drive pipe 106. The outer peripheral surface of the drive pipe 106 has a quadrangular shape (square shape), and the hole of the mounting boss 104a of the rotor piece 104 also has a quadrangular shape (square shape). Accordingly, the mounting boss 104a of the rotor piece 104 is fitted to the drive pipe 106, and the drive shafts 70a and 70b and the rotor piece 104 are integrally rotated. The leveling plates 104b are planar and are arranged obliquely with respect to the rotation direction of the leveling rotor, and a total of six leveling plates 104 are provided with a phase of every 30 degrees in the rotation direction of the leveling rotor. The leveling plates 104b of the plurality of rotor pieces 104 provided on the left and right are in contact with each other and matched, and the leveling plates 104b are arranged in a row on the left and right. The connecting portion 104c is disposed at the left and right center position of the leveling plate 104b within the left and right width of the leveling plate 104b, is configured in a plate shape, and is configured integrally with the mounting boss portion 104a and the total six leveling plates 104b. The mounting boss 104a is also arranged at the left and right center position of the leveling plate 104b within the left and right width of the leveling plate 104b, similarly to the connecting portion 104c. The mounting bolt 107 is provided on the drive shafts 70a and 70b at a position where the mounting boss 104a and the connecting portion 104c are not disposed.

  The left and right foreign matter winding preventing portions 95 overlap with the left and right end portions of the leveling plate 104b that are continuous with the central leveling rotor 27b in front of the rotor pieces 104 at the left and right ends of the central leveling rotor 27b in front view of the machine body. Projecting from the rotor transmission case 73. The drive shaft bearing portion 99 is positioned at the inner side in the rotational direction of the leveling plate 104b, that is, on the drive shafts 70a and 70b side and in the left and right ends of the leveling plate 104b connected to the central leveling rotor 27b and the side leveling rotor 27a in front view of the machine body. It protrudes from the rotor transmission case 73 to the position where it overlaps with each part. Further, the drive shaft bearing portion 99 includes a hole 108 through which the drive base shaft 105 passes, and the drive base shaft 105 is in contact with the inner surface of the hole 108, and an oil seal is provided inside the case of the rotor transmission case 73 from the hole 108. 109 is disposed, and a bearing 110 is disposed further inside the oil seal 109. Therefore, the oil seal 109 is not exposed outward from the rotor transmission case 73.

  As described above, the leveling device 94 is provided with the drive shafts 70a and 70b that are driven and rotated by the power in the rotor transmission case 73 protruding from the drive shaft bearing portion 99 of the rotor transmission case 73 in the left-right direction. A leveling rotor that rotates by driving of 70b is provided, and the leveling rotor includes an installation boss 104a for mounting on the drive shafts 70a and 70b, a leveling plate 104b that contacts the soil surface and performs leveling, and an installation boss. 104a and the ground leveling plate 104b are connected to each other, and the foreign matter winding prevention unit 95 is provided on the rotor transmission case 73 side so as not to move, and the foreign matter winding prevention unit 95 is provided in front of the leveling plate 104b. And it arrange | positions in the position which overlaps with the left-right direction edge part of the leveling board 104b in the front view of an airframe. Further, the drive shaft bearing portion 99 is disposed in the rotational direction inner side than the leveling plate 104b, that is, on the drive shafts 70a and 70b side, and at a position overlapping the left and right end portions of the leveling plate 104b in the front view of the machine body. Further, the oil seal 109 of the drive shaft bearing portion 99 is provided so as not to be exposed outward from the rotor transmission case 73.

  Therefore, since the space at the left and right end portions of the leveling plate 104b on the front side of the machine body is blocked by the foreign matter winding prevention unit 95, the space between the left and right end portions of the leveling plate 104b and the rotor transmission case 73 by the advancement of the machine body. It becomes difficult for foreign matters such as soot to enter the drive shafts 70a and 70b, and the foreign matter is prevented from winding around the drive shafts 70a and 70b or the mounting boss 104a, thereby improving the maintenance performance. Further, since the drive shafts 70 a and 70 b and the mounting boss 104 a are not exposed to the outside in the left and right direction of the leveling plate 104 b by the drive shaft bearing portion 99, it enters from between the left and right end portions of the leveling plate 104 b and the rotor transmission case 73. Since foreign matters such as debris are less likely to come into contact with the drive shafts 70a, 70b or the mounting boss portion 104a, it is possible to prevent the foreign matters from being wound around the rotating drive shafts 70a, 70b or the mounting boss portion 104a, thereby improving maintenance. . Further, no foreign matter is wrapped around the oil seal 109 portion, and the oil seal 109 can be prevented from being damaged due to the foreign matter being wrapped around the oil seal 109 portion, and thus leakage of the lubricating oil from the rotor transmission case 73 can be prevented. Maintainability is improved.

  In addition, although the above-mentioned foreign matter winding prevention part 95 was comprised with the case body of the rotor transmission case 73, you may comprise with other members supported by the rotor transmission case 73, such as the rotor cover 98.

27a side leveling rotor
27b Central leveling rotor 70a Drive shaft 70b Drive shaft 73 Rotor transmission case 94 Leveling device 95 Contaminant winding prevention portion 99 Drive shaft bearing portion
104 rotor piece 104a mounting boss 104b leveling plate 104c connecting part
105 drive shaft
106 Drive pipe 109 Oil seal

Claims (2)

A center leveling rotor (27b) is provided between the left and right sides of the left and right rotor transmission cases (73, 73), and the side leveling rotors (27a, 27a) are arranged on the left and right sides of the left and right rotor transmission cases (73, 73). Provided,
The left and right rotor transmission cases (73, 73) have a first drive shaft bearing portion (99) for receiving a first drive shaft (70b) for rotating the center leveling rotor (27b), and side leveling rotors (27a, 27a). A second drive shaft bearing (99, 99) for receiving the second drive shaft (70a, 70a) for rotating
A transmission bevel gear (102) and a transmission shaft (103) are provided in the left and right rotor transmission cases (73, 73), respectively.
An oil seal (109) is provided in the first drive shaft bearing (99), and the oil seal (109) is not exposed to the outside from the left and right rotor transmission cases (73, 73).
The central leveling rotor (27b) and the left and right side leveling rotors (27a, 27a) are mounting bosses for mounting on the first drive shaft (70b) or the left and right second drive shafts (70a, 70a). and 104a), leveling plates for leveling grounded soil surface and (104b), a plurality of rotor pieces made of connection for connecting the mounting boss portion (104a) and leveling plate (104b) (104c) (104)
Left and right foreign matter winding prevention portions (95, 95) are formed at the front end portions of the left and right rotor transmission cases (73, 73) so as to protrude inward in the left-right direction, and the left and right foreign matter winding prevention portions are formed. (95, 95) and left and right protrusions (96, 96) are formed on the rear side of the central leveling rotor (27b), and left and right protrusions (95, 95) 96, 96) is mounted on the rotor cover (98),
The left and right contaminants wrap preventing portion (95, 95), along with to overlap the lateral direction end portion of the ground leveling plate leveling plate in and the front view of the aircraft in front of (104b) (104b), said first drive A leveling device characterized in that the shaft bearing portion (99) overlaps with the left and right end portions of the leveling plate (104b) in a front view of the airframe . The first drive shaft (70b) is formed by connecting a drive base shaft (105) provided in the first drive shaft bearing (99) and a drive pipe (106) to which the plurality of rotor pieces (104) are attached. The leveling device according to claim 1, wherein the leveling device is configured.

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