JP2004067019A - Paddy working machine - Google Patents

Abstract

An object of the present invention is to improve the durability of a side clutch and, at the same time, to reduce the turning radius.
A side clutch (59) is interposed in each of the transmission systems to the left and right driving rear wheels, and each of the output members (108) on the lower transmission side of these side clutches (59) is shifted in the axial direction. Thus, the shift body is configured to be switchable between the transmission state and the non-transmission state with respect to the input body 107 on the transmission upper side.
[Selection diagram] FIG.

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a paddy field working machine such as a rice transplanter.
[0002]
[Prior art]
(1) In this kind of paddy field working machine, a side clutch is interposed in each of the transmission systems to the left and right driving rear wheels, and at the time of turning, the side clutch for the driving rear wheel inside the turning is disengaged to perform turning. There is a technology that attempts to perform a small radius turn by turning off the drive of the inner drive rear wheel. In such a case, conventionally, as a side clutch, each of the transmission upper input bodies can be shifted between the transmission state and the non-transmission state with respect to the transmission lower output body by shifting and moving along the axial direction. A shift body was adopted.
[0003]
(2) In this type of paddy working machine, for example, a rice transplanter with a fertilizer application device, a side clutch is interposed in each of the transmission systems to the left and right driving rear wheels, and a counter shaft for distributing power to these side clutches is provided. A configuration in which a power take-out shaft for taking out power from the transmission case to the outside of the transmission case as power for driving the fertilizer application device may be adopted in the transmission mechanism to the counter shaft. In such a case, a configuration has been adopted in which a shaft transmission mechanism is provided as a transmission mechanism to the counter shaft, and a power take-out shaft is interlocked with the transmission shaft of the shaft transmission mechanism via a bevel gear mechanism.
[0004]
(3) In this type of paddy working machine, a side clutch is interposed in each of the transmission systems to the left and right drive wheels, and a counter shaft for distributing power to these side clutches is provided. As a transmission mechanism for the counter shaft, A configuration in which a chain transmission mechanism including a transmission chain and a tighter acting on the transmission chain may be employed. In such a case, conventionally, in such a case, the tight toner is reliably attached to the transmission chain by attaching the tight toner holder to the transmission case.
[0005]
(4) In this kind of paddy field working machine, for example, a rice planting machine, the seedling planting mechanism is set at a fixed position so that the seedling planting mechanism does not stop in a state where the seedling removal claw of the seedling planting plant enters the field. To stop, as a means, to the transmission system to the paddy working device linked to the traveling section, to the paddy working device only when the output shaft to the paddy working device is in the set phase state with respect to the mission case In this case, means for interposing a fixed position stop type work clutch which allows the transmission and disconnection of the transmission is interposed. In such a case, when the output clutch body of the work clutch is prevented from rotating with respect to the output shaft to achieve the fixed position stop, conventionally, the rotation has been prevented by a spline.
[0006]
(5) In this type of paddy working machine, a transmission system having an input shaft in a left-right orientation may be provided as a transmission system to the paddy working device linked to the traveling unit. Adopts a configuration that includes a torque limiter that automatically cuts off transmission to the output shaft when a load greater than the set is applied to the paddy field working device, and a work clutch that interrupts transmission to the paddy field working device based on operation. May be done. In such a case, conventionally, a configuration has been adopted in which a torque limiter is provided on an intermediate transmission shaft in a front-rear direction interlocked with the input shaft, and a work clutch is provided on an output shaft in a front-rear position interlocked with the intermediate transmission shaft. .
[0007]
(6) In this type of paddy field working machine, it is necessary to discharge the air in the transmission case to the outside, that is, to blaze the oil in the transmission case without discharging the oil in the transmission case to the outside. As a countermeasure, a means for connecting a buffer member, which forms a buffer space for separating oil and air, to a mission case has been conventionally used.
[0008]
(7) In this type of paddy working machine, a shift shaft for operating the transmission is held in a case wall of a transmission case equipped with a gear shift type transmission in a state of penetrating the inside and outside of the transmission. Each of the shift shafts is shifted in a state in which the ball held on the case wall is selectively elastically engaged with the plurality of circumferential grooves formed side by side in the axial direction to allow shift movement based on operation of the shift shaft. Detents may be provided to hold in place. In such a case, conventionally, the ball and a spring that urges the ball to move in the engagement direction are detachably held on the case wall by being screwed and mounted on the case wall while penetrating the case wall in and out. A hole was formed in the plug to hold the ball and spring.
[0009]
[Problems to be solved by the invention]
However, the conventional technique has the following disadvantages.
According to the conventional technique (1), the input member on the transmission upper side, that is, the rotating input member in both the transmission state and the non-transmission state is shifted, so that the transmission state and the non-transmission state are shifted. Therefore, the input body and the operating tool for shifting the input body are always in a sliding state, and wear of both of them proceeds at an early stage, so that the durability is lacking.
[0010]
According to the prior art (2), since the power take-out shaft is linked to the transmission shaft by the bevel gear mechanism, two gears are required, resulting in a complicated structure and increased cost.
[0011]
In the case of the prior art (3), since the tight toner holder is a separate member from the transmission case, it is necessary to attach the tight toner holder to the transmission case, and the assembling workability is poor.
[0012]
According to the prior art (4), since the output clutch is spline-fitted to the output shaft to prevent rotation, the output clutch has a plurality of fitting postures with respect to the output shaft. When the bodies are spline-fitted, the phase matching of the two is performed by selecting from a plurality of pieces, and although the assembly workability is poor, it is easy to cause a situation where the two are fitted in the wrong phase state.
[0013]
According to the prior art (5), a torque limiter is provided on the intermediate transmission shaft, and a work clutch is provided on the output shaft. The torque limiter is interlocked to the input shaft at one end of the torque limiter in the axial center direction. Since the work clutch is interlocked to the torque limiter at the other end of the work clutch in the axial direction, the torque limiter and the work clutch are displaced in the left-right direction and displaced in the axial direction. The whole was easy to enlarge. Moreover, both the intermediate transmission shaft and the output shaft need to be supported at both ends, and the number of bearings to be used is reduced to at least four, resulting in a complicated structure and an increased cost.
[0014]
According to the conventional technique (6), a dedicated buffer space forming member for the blazer must be protruded from the transmission case, which leads to a complicated structure, a large size, and an increased cost around the transmission case. I was
[0015]
According to the prior art (7), since the ball and spring of the detent mechanism are held by the plug, the plug protrudes outward from the transmission case, which complicates the shape of the transmission case and allows the members to be connected to the transmission case. The installation was disadvantageous.
[0016]
An object of the present invention is to eliminate the above-mentioned conventional disadvantages.
[0017]
[Means for Solving the Problems]
The features, operations, and effects of the paddy field working machine according to the first aspect of the present invention are as follows.
[0018]
〔Characteristic〕
A side clutch is interposed in each of the transmission systems to the left and right driving rear wheels, and each of the output members on the lower transmission side of these side clutches is shifted along the axial center direction to thereby input the upper transmission. The point is that the shift body is configured to be switchable between a transmission state and a non-transmission state with respect to the body.
[0019]
[Action]
The side clutch is provided with a switchable state between the transmission state and the non-transmission state by shifting the output body on the lower side of the transmission to shift, and the output body basically does not rotate in the non-transmission state. Therefore, there is little sliding between the output member and the operation tool for shifting the output member, and wear of both members can be suppressed.
In addition, since the frictional force between the output body and the operating tool acts as a braking force against the cohesive rotation of the driving rear wheel inside the turning in the non-transmission state, the rotational speed of the driving rear wheel inside the turning decreases. .
[0020]
〔effect〕
Therefore, the durability of the side clutch can be improved, and at the same time, the turning radius can be reduced.
[0021]
The features, functions and effects of the paddy field working machine according to the second aspect of the present invention are as follows.
[0022]
〔Characteristic〕
A side clutch is interposed in each of the transmission systems to the left and right driving rear wheels, and a counter shaft for distributing power to these side clutches is provided.The power for taking out the power to the chain transmission mechanism to this counter shaft out of the transmission case The point is that a take-out shaft is provided.
[0023]
[Action]
Since the power transmission mechanism to the counter shaft is a chain transmission mechanism, power is taken out from the chain transmission mechanism to the power take-off shaft, so when power is taken out from the chain transmission mechanism to the power take-out shaft, the power take-off shaft meshes with the chain. All you need to do is attach the interlocking sprocket wheels.
[0024]
〔effect〕
Therefore, the number of components required for power take-out can be reduced, so that the structure can be simplified and the cost can be reduced.
[0025]
The features, operations and effects of the paddy field working machine according to the third aspect of the present invention are as follows.
[0026]
〔Characteristic〕
In the paddy field working machine according to the second aspect of the present invention, the power take-off shaft is supported by the transmission case in a state in which the power take-out shaft is interlocked with the permanent shaft held in the transmission case and can be released from and uncoupled with the permanent shaft. On the other hand, an attachment shaft that can be taken out of the transmission case in the interlock release state.
[0027]
[Action]
When the power take-out is not required, the attachment shaft can be removed from the power take-out shaft. Therefore, when the power take-out is unnecessary, it is not necessary to keep the attachment shaft attached unnecessarily.
[0028]
〔effect〕
Therefore, when power removal is required, the power can be reliably removed by attaching the attachment shaft, but when the power removal is not required, the attachment shaft is not attached to cope economically. be able to.
[0029]
The features, functions and effects of the paddy field working machine according to the present invention according to claim 4 are as follows.
[0030]
〔Characteristic〕
In the paddy field working machine according to the second and third aspects of the present invention, a brake capable of braking and releasing the braking of the power take-off shaft is provided.
[0031]
[Action]
Since the chain transmission mechanism can be braked by braking the power take-out shaft with the brake, the braking operation and the attachment unit such as a fertilizer device driven by the power take-out shaft and the traveling unit are synchronized and braked and released by the brake operation. can do.
[0032]
〔effect〕
[0033]
Therefore, the attachment device and the traveling section can be braked and released by a single brake with a simple structure and at low cost.
[0034]
The features, operations, and effects of the paddy field working machine according to the fifth aspect of the present invention are as follows.
[0035]
〔Characteristic〕
A side clutch is interposed in each of the transmission systems to the left and right driving rear wheels, and a counter shaft for distributing power to these side clutches is provided.As a transmission mechanism for this counter shaft, a transmission chain and a tighter acting on it are provided. A chain transmission mechanism is provided, and the transmission case in which the chain transmission mechanism is provided has a tight toner holding portion integrally formed therewith.
[0036]
[Action]
Since the tight toner holding portion is formed integrally with the mission case, a tight toner holder that is mounted on the mission case is unnecessary.
[0037]
〔effect〕
Therefore, the tight toner can be maintained in the operating state with a simple structure.
[0038]
The features, operations, and effects of the paddy field working machine according to the present invention according to claim 6 are as follows.
[0039]
〔Characteristic〕
The transmission system to the paddy field working device that is linked to the traveling unit, the fixed position stop type that allows the transmission and interruption of the transmission to the paddy field working device only when the output shaft to the paddy field working device is in the set phase state with respect to the transmission case And the output clutch body of the work clutch is prevented from rotating with respect to the output shaft by a key.
[0040]
[Action]
Since the output body of the work clutch is prevented from rotating with respect to the output shaft by the key, the phase when connecting the output shaft and the output body in the detented state becomes one, and the output shaft and the output body are keyed. Positioning is easy so that can be mounted.
[0041]
〔effect〕
Therefore, the output shaft and the output body can be prevented from rotating in a predetermined phase state with good workability.
[0042]
The features, operations and effects of the paddy field working machine according to the present invention according to claim 7 are as follows.
[0043]
〔Characteristic〕
As a transmission system to the paddy field working device interlocking with the traveling unit, a work clutch having an input shaft having a left-right posture and an output shaft having a front-rear posture is provided, and a work clutch for intermittently transmitting power to the output shaft based on an operation. And a torque limiter that automatically switches to a power transmission cutoff state when a load greater than or equal to a load acts on the output shaft, and a torque limiter that is arranged concentrically with the output shaft and aligned along the axis. It is in.
[0044]
[Action]
Since the work clutch and the torque limiter are arranged concentrically and arranged along the axis, the work clutch and the torque limiter must have a large left and right width as the installation space for the work clutch and the torque limiter. It only needs to be able to accommodate left and right.
[0045]
〔effect〕
Therefore, the work clutch and the torque limiter can be arranged compactly.
[0046]
The features, operations and effects of the paddy field working machine according to the present invention according to claim 8 are as follows.
[0047]
〔Characteristic〕
A torque generator for power steering is mounted on the upper part of the transmission case that can be split into two parts, with its output shaft protruding into the transmission case. The upper end of the steering shaft, which transmits the rotation of the output shaft to the steered wheels, is rotatably held by a boss portion connected to the transmission case, and the lower surface of the torque generator and the boss portion are supported by the transmission case. A buffer space communicating with the outside is formed between the support portion and the support portion, and a communication path for communicating the inside of the transmission case with the buffer space is formed in the left and right split surface portions of the support portion. .
[0048]
[Action]
Focusing on the fact that the torque generator is arranged at the upper part of the transmission case, a buffer communicating to the outside between the support part that supports the boss part that rotatably holds the steering operation shaft on the transmission case and the lower surface of the torque generator In addition to forming a space for communication, a communication passage that connects the inside of the mission case and the space for buffer is formed in the left and right split surfaces of the support so that the blazer can be performed in a state where gas-liquid separation is performed in the space for buffer. Therefore, a special buffer space constituting member is not required.
[0049]
〔effect〕
Therefore, a blazer can be performed while performing gas-liquid separation using a buffer with a simple structure and at low cost.
[0050]
The features, functions and effects of the paddy field working machine according to the ninth aspect of the present invention are as follows.
[0051]
〔Characteristic〕
A plurality of circumferential grooves formed on a case wall of a transmission case in which a gear shift type transmission is mounted, in which a shift shaft for operating the transmission is held in a state of penetrating the inside and outside of the transmission case, and formed on the peripheral surface of the shift shaft in a line in the axial direction. A detent is provided for holding the shift shaft in each shift position in a state in which the shift movement based on the operation of the shift shaft is allowed by selectively elastically engaging the ball held on the case wall with respect to the ball. A groove is formed in the case wall to allow the ball to move freely in the direction of engagement and disengagement and to hold the spring in order to hold the spring that moves and urges it in the engagement direction to the case wall. The present invention is characterized in that a lid plate is provided for closing the groove by being connected and fixed to prevent the ball and the spring from coming off the groove.
[0052]
[Action]
The detent ball is held movably in the direction of engagement and disengagement by the groove formed in the case wall and the lid plate bolted with the groove closed in the case wall. No protruding plug is required.
[0053]
〔effect〕
Therefore, the outside of the transmission case is made simple and the members are mounted on the transmission case rationally.
[0054]
BEST MODE FOR CARRYING OUT THE INVENTION
As shown in FIGS. 1 and 2, a riding type rice transplanter, which is an example of a paddy field working machine, includes a multi-row seedling planting apparatus 2, which is an example of a paddy field working apparatus, provided at a rear portion of a self-propelled body 1 with a link mechanism 3. And a lift cylinder 4 using a hydraulic cylinder that raises and lowers the seedling planting device 2 with the supply of pressurized oil and lowers with its own weight with drainage of oil.
[0055]
The self-propelled body 1 has an engine 9 covered with a hood 8 at the front of a body frame 7 having a pair of left and right driving front wheels 5 for steering and a pair of left and right driving rear wheels 6. An operating steering handle 10 is provided, and a driver's seat 11, a fertilizer hopper 12, and an electric blower 13 that generates an airflow for pumping the fertilizer fed from the hopper 12 are provided at a rear portion of the body frame 7. It is arranged and configured. Further, the self-propelled body 1 includes a boarding step 14 also serving as a front wheel fender and a rear wheel fender 15.
[0056]
The seedling planting apparatus 2 is capable of placing a plurality of mat seedlings side by side in a horizontal direction and a grounding float 24 for sliding the field scene and leveling the field scene with the planting run, and reciprocating with a set stroke in the left and right direction. The seedling nest 25 is driven and moved, and the seedling nest is circulated between the seedling outlet 25 at the lower end of the seedling nest 25 and the leveling field by the ground float 24 in conjunction with the movement of the seedling nest 25. And a planting mechanism 26 for taking out the mat seedlings on the table 25 by the planting unit amount and planting them in a leveling field scene. Further, a groove generator 28 is provided for forming a fertilizer groove in a field scene along with the planting and running, and for supplying the fertilizer pressure-fed from the self-propelled body 1 via a hose 27 to the groove.
[0057]
As shown in FIG. 3, the body frame 7 outputs the output of a hydrostatic continuously variable transmission 17 which is driven forward and backward by the engine 9 via a belt transmission 16, to a traveling unit (drive front wheels). 5 and a rear drive wheel 6) and a transmission case 18 distributed to the seedling planting apparatus 2, an engine mounting frame 19 fixedly connected to a front portion of the transmission case 18, and a driver seat 11 fixedly connected to a rear portion of the transmission case 18. And a pair of left and right rear frames 20 supporting the rear wheel fender 15 and the like. An operation lever 17a of the continuously variable transmission 17 is provided so as to protrude outward from the steering handle 10 to the left and right.
[0058]
The fertilizer hopper 12, the blower 13, the hose 27, and the groove generator 28 constitute a fertilizer.
[0059]
As shown also in FIG. 4, each of the drive front wheels 5 is supported by the transmission case 18 via left and right front axle cases 21 each having a transmission mechanism therein.
[0060]
As shown also in FIG. 4, each of the driving rear wheels 6 is provided with the transmission via a left and right swing case 22 that can swing up and down around a front fulcrum R in a state in which a chain transmission mechanism is mounted therein. The case 18 is specifically supported to be vertically movable. In addition, a suspension spring 23 that urges the swing case 22 downward is interposed between each swing case 22 and the rear frame 20. 23a is a stabilizer for stabilizing the vertical swing of the left and right driving rear wheels 6.
[0061]
As shown in FIGS. 4 and 7, the transmission case 18 is a case that can be divided into two parts, and an output shaft 29 is mounted on the upper part of the transmission case 18 in the transmission case 18 as shown in FIGS. The power steering torque generator 30 is mounted in such a manner as to protrude from the power steering.
The upper end of a lower steering operation shaft 31 is inserted into and connected to the output shaft 29 in an integrally rotating state. A pinion of a rack-and-pinion type steering device that steers the drive front wheel 5 is connected to a lower end portion of the lower steering operation shaft 31, and more specifically, is linked to a knuckle arm 32 of the drive front wheel 5 via a rod 33 a. A pinion 34 that moves the rack 33 to the left and right so that the driving front wheel 5 is steered around the kingpin axis x by rotating while meshing with the rack 33 to be rotated is integrally mounted.
[0062]
On the other hand, a lower end of an upper steering operation shaft 36 is connected to an input shaft 35 protruding above the torque generator 30 via a universal joint 37 so as to rotate integrally therewith. A lower end of a steering shaft 38 that rotates integrally with the steering handle 10 is linked to an upper end of the upper steering operation shaft 36 via a universal joint 39 so as to rotate integrally.
[0063]
That is, by rotating the steering handle 10, the operating force is increased by the torque generator 30, and the rack and pinion type steering device is operated to steer the drive front wheels 5. The steering handle 10 is rotatably attached to an upper end of a steer link post 40 erected on the upper end of the torque generator 30. In the steering post 40, the upper steering operation shaft 36 is disposed. The torque generator 30 is fixedly connected via a bolt 41 to one case portion of the splittable transmission case 18.
[0064]
An upper end portion of the lower steering operation shaft 31 is rotatably held by a boss portion 42 provided continuously to the transmission case 18, and a plate for supporting the boss portion 42 of the transmission case 18 on the transmission case body. A buffer space 44 communicating with the outside, that is, a space for separating gas and liquid in the blazer, is formed between the support portion 43 having a shape of a circle and the lower surface of the torque generator 30. Is communicated with the inside of the transmission case 18 through a communication passage 45 formed in the left and right split surfaces of the support portion 43.
[0065]
As shown in FIG. 8, the transmission system to the traveling unit includes a shift input shaft 48 in a left-right orientation that is linked to the output shaft 46 of the continuously variable transmission 17 via a coupling 47 in an integrally rotating state. A transmission 52 of a gear shift type is provided, and a differential 52 for the drive front wheel 5 having a differential input shaft 51 interlocked with a transmission output shaft 50 of the transmission 49 via a gear is provided. 51 is provided with a counter shaft 54 for the left and right driving rear wheels 6 interlockingly connected via a chain transmission mechanism 53, and a differential output shaft 55 for each driving front wheel 5 of the differential 52 is transmitted to a front wheel transmission in the left and right front axle cases 21. The counter shaft 54 is linked to a mechanism 56, and the counter shaft 54 is connected to each swing arm 22 by a side clutch 59 using a multi-plate clutch. It is constructed by pivotal coupling.
[0066]
The transmission 49 is an auxiliary transmission, and as shown in FIG. 9, a large-diameter high-speed transmission gear 60 and a small-diameter low-speed transmission gear 61 are mounted on a transmission input shaft 48 so as to rotate integrally with each other. The high-speed position where the small-diameter high-speed passive gear portion 62a meshes and interlocks with the large-diameter high-speed transmission gear 60 and the low-speed position where the large-diameter low-speed passive gear portion 62b meshes and cooperates with the small-diameter low-speed transmission gear 61 and the two gear portions 62a and 62b. Both gears are configured to spline-fit the shift gear 62 to a shift neutral position that is not engaged with and interlocked with the other party to perform high-low two-step shifting.
[0067]
The operating means for operating the transmission 49 causes the case wall 18A of the transmission case 18 to hold a shift shaft 64 for operating the shift gear 62 via the shifter 63 in a state of penetrating inside and outside. The ball 66 held by the case wall 18A is selectively elastically engaged with a plurality of circumferential grooves 65 formed in parallel in the axial direction on the peripheral surface of the shaft, thereby allowing the shift movement based on the operation of the shift shaft 64. A detent 67 is provided for holding the shift shaft 64 at each of the shift positions H, N, and L in a state in which the shift shaft 64 moves.
[0068]
As shown in FIG. 10, the detent 67 has a groove for allowing the ball 66 to move freely in the engaging and disengaging direction and a spring 68 for urging the ball 66 to move in the engaging direction into the case wall 18A. A cover plate 71 is formed on the case wall 18A, and is fixedly connected to the case wall 18A with a bolt 70 to close the groove 69 and prevent the ball 66 and the spring 68 from coming off the groove 69. It is configured.
[0069]
The differential 52 is a differential lock that is switchable between a differential lock state in which the differential input shaft 51 and the differential output shaft 55 are interlocked in an integrally rotating state to stop the differential operation and an unlocked state in which the differential operation is released and the differential operation is permitted. It has a clutch 72.
[0070]
The front wheel transmission mechanism 56 has the upper end of the transmission shaft 73 linked to the end of the differential output shaft 55 via a first bevel gear mechanism 74, and the lower end of the transmission shaft 73 to the front axle 75 via a second bevel gear mechanism 76. The first bevel gear mechanism 74 performs first-stage deceleration transmission, and the second bevel gear mechanism 76 performs second-stage deceleration transmission. In other words, up to the front wheel transmission mechanism 56, by transmitting power in a low torque state, it is possible to use only a small number of transmission elements to the front wheel transmission mechanism 56, but two-step deceleration by the front wheel transmission mechanism 56 is sufficient. The front wheels 5 are decelerated to be driven strongly with high torque.
[0071]
As shown in detail in FIGS. 11 to 13, the chain transmission mechanism 53 includes a transmission sprocket wheel 77 mounted integrally with the differential input shaft 51 and a passive sprocket wheel 78 mounted integrally with the counter shaft 54. And a pair of tight toners 80 acting on the tension side and the slack side of the transmission chain 79 are provided.
The means for holding the tie toner 80 includes a first holding portion 81 that forms an insertion portion for inserting and holding each of both ends in the longitudinal direction of one tie toner 80 and one end in the longitudinal direction of the other tie toner 80 with the case wall 18A. A pair of second holding portions 82 forming an insertion portion for inserting and holding the other longitudinal end of the other toner 80, and pressing the intermediate portion in the longitudinal direction of the toner 80 toward the transmission chain 79 to act the toner 80. This is means for integrally forming the third holding portion 83 for holding the posture with the transmission case 18. The first holding unit 81, the second holding unit 82, and the third holding unit 83 are the tie toner holding unit 84 according to the present invention.
[0072]
As shown in detail in FIGS. 11 to 13, the chain transmission mechanism 53 includes a power take-out shaft 85 for taking out power to the outside of the transmission case 18 and a brake 86 that can brake and release the power take-out shaft 85. Are provided.
[0073]
The power take-off shaft 85 is rotatably held via two bearings 88 on the transmission case 18 in a state of being engaged with and linked to the transmission chain 79 via a sprocket wheel 87, and On the other hand, it is composed of an attachment shaft 90 that can be interlocked and released freely and is supported by the transmission case 18 in the interlocked state while being detachable from the transmission case 18 in the interlocked state.
[0074]
The means for rotatably holding the attachment shaft 90 is such that the inside end of the attachment shaft 90 is rotatably inserted and held in the end face of the permanent shaft 89, and the vicinity of the outside end is attached to the case wall 18A via the removable bearing 91. It is a means to be supported rotatably.
The means for interlocking and uncoupling the attachment shaft 90 with respect to the permanent shaft 89 is such that the end in the axial direction is moved to the end of the permanent shaft 89 by moving the attachment shaft 90 along the axis of rotation. The clutch body 92, which is interlocked and released by being disengaged, is spline-fitted to the attachment shaft 90 so as to rotate integrally with the attachment shaft 90, and the spring 93 for urging the clutch body 92 to move in the engagement direction, that is, the interlocking position, is provided. And an operation shaft 95 that rotates the set amount in one direction around an axis perpendicular to the axis of rotation and thereby disengages and moves the clutch body 92 against the urging force via the cam 94 at the tip. It is configured to be detachably mounted on the transmission case 18.
That is, the attachment shaft 90 can be detached from the transmission case 18 by removing the detachable bearing 91 and the operation shaft 95 as shown in FIG. Each of 151 and 152 is a lid for closing the opening of the transmission case 18 opened by removing the attachment shaft 90 and the opening of the transmission case opened by removing the operation shaft 95.
[0075]
The power take-out shaft 85 is connected to the outer end of the attachment shaft 90 via a nut 96 via a crank arm 97 and a push-pull interlock rod 98 interlockingly connected thereto. Is operated.
[0076]
The brake 86 is a multiple disc brake acting on the permanent shaft 89. By rotating the camshaft 101 in one direction about an axis perpendicular to the rotation axis by a predetermined amount, the brake plate group is pressed against the axis via the pressure plate 102 to perform a braking operation, The brake is released by releasing the pressure contact, and the power take-off shaft 85 is braked to brake the feeding portion of the fertilizer application device and at the same time to brake the left and right driving rear wheels 6 via the transmission chain 79. It is. The camshaft 101, that is, the brake 86, as shown in FIG. 2, is operated by depressing a brake pedal 103 provided at the foot of the driving unit, and performs a braking operation. When the brake pedal 103 is depressed, the continuously variable transmission 17 is switched to a neutral state for shifting.
[0077]
Each of the rear wheel transmission mechanisms 57 is provided with an intermediate transmission shaft 105 that drives the rear axle 104 through a gear, and a transmission chain 106 that transmits power from the rear wheel input shaft 58 to the intermediate transmission shaft 105. ing.
[0078]
As shown in detail in FIGS. 14 and 15, the side clutch 59 is mounted on the passive sprocket wheel 78 such that the input body 107 rotates integrally with the passive sprocket wheel 78, and the rear wheel input shaft 58 has an axial center thereof. The output member 108 which is movable in the direction is set as a shift member and spline-fitted so as to rotate integrally with the rear wheel input shaft 58, and the output member 108 is set in the axial direction so that the clutch plates are pressed against the axial direction. A clutch spring 111 that urges the clutch plate group to move in the direction is provided, and by rotating a set amount in a set direction from a set position in a set direction around an axis perpendicular to the axis of the rear wheel input shaft 58, the pressure contact of the clutch plate group is released and transmission is performed. A clutch operating shaft 113 for moving the output member 108 via the cam 112 against the urging force of the clutch spring 111 is provided at the disengaged clutch disengagement position. That.
[0079]
Then, as shown in FIGS. 4 and 16 (a) and (b), the means for operating the side clutch 59 is provided for the drive rear wheel 6 on the inner side of the turn with the steering operation of the drive front wheel 5 at a set angle or more. A means for interlockingly connecting an operation arm 114 integrally formed on the knuckle arm 32 and an operation lever 115 connected to the clutch operation shaft 113 so as to rotate integrally with the knuckle arm 32 by a steering rod 116 so that the side clutch 59 is disengaged. The interlocking hole 118 of the operating rod 116 with the interlocking pin 117 of the operating arm 114 does not transmit the steering operation of the drive front wheel 5 at a set angle less than the set angle to the operating rod 116 and after the side clutch 59 is disengaged. The driving front wheel 5 is formed in a long hole that allows a subsequent steering operation.
[0080]
As shown in FIG. 8, the transmission system to the seedling planting apparatus 2 operates the seedling planting apparatus 2 in conjunction with the traveling unit. The transmission system part on the self-propelled body 1 side includes the transmission 49. Of the transmission input shaft 48 of FIG. As shown in detail in FIGS. 17 and 18, the transmission system portion is provided with the transmission input shaft 48 (input shaft 119) on the relay gear body 120 which is freely and rotatably fitted to the transmission output shaft 50 of the transmission 49. A one-way clutch 121 that transmits only forward rotation of the rotation of the vehicle is provided, and a stock transmission 122 to which power is transmitted via the relay gear body 120 is provided. A drive shaft 123 is provided on the lower side of the stock transmission 122. An output shaft 125 (that is, a power take-out shaft for the seedling planting device 2) having a front-rear posture transmitted to the input shaft of the seedling planting device 2 through the shaft is provided. The transmission is stopped when the output shaft 125 enters the set phase state with respect to the transmission case 18 based on the operation and the torque limiter 126 that switches to the transmission cutoff state. Is formed by arranging the planting clutch 127 as a working clutch location-stop in concentrically arranged on the axis of the output shaft 125.
[0081]
The inter-stock transmission 122 includes a plurality of transmission gear pairs 130 having different transmission ratios between the inter-stock input shaft 128 and the inter-stock output shaft 129 interlocking with the relay gear body 120. In addition, an inter-stock selection clutch 134 using a ball clutch is provided in which only one passive gear 132 of the transmission gear pair 130 is interlocked with the inter-stock output shaft 129 via a ball 133 by moving the shift shaft 131 in the axial direction. It is configured.
[0082]
The output shaft 125 is composed of an upper shaft portion 135 and a lower shaft portion 136 which are rotatably fitted to each other at the shaft end portions. Each of the side shaft portions 136 is rotatably supported by the transmission case 18 via a bearing 137 at an intermediate portion in the longitudinal direction.
[0083]
The torque limiter 126 is disposed closer to the transmission than the planting clutch 127. A passive bevel gear 139 meshing with and interlocking with a transmission bevel gear 138 integrally rotatably mounted on the inter-stock output shaft 129 is rotatably mounted on the upper shaft 135, and meshes with a clutch claw 140 formed on the passive bevel gear 139. A movable clutch body 141 movable between an interlocked clutch engagement position and a disengaged clutch disengagement position is spline-fitted so as to rotate integrally with the upper shaft 135, and a load greater than a set load is applied to the movable clutch body 141. When actuated, the clutch spring 142 that urges the movable clutch body 141 to the clutch engagement position in a state in which the movable clutch body 141 is moved to the clutch disengaged position by the cam action of the clutch pawl 140 of the movable clutch body 141 is integrally rotated with the upper shaft 135. Spline-fitted spring receiver 143 and passive bevel It is configured provided between the 139.
[0084]
The planting clutch 127 is provided along the shaft center on the lower shaft portion 136 at a clutch engagement position where the clutch claw 144 is engaged with a claw hole 145 formed in the spring receiver 143 and a clutch disengagement position where the clutch claw 144 is disengaged. The output clutch body 146 is mounted in a non-rotating state via a key 147 so that the output clutch body 146 is in a positional relationship of a set phase with respect to the spring receiver 145. The output clutch body 146 is provided so as to be engaged only when the output clutch body 146 is rotated. When located at the phase position, the output clutch body 146 is pressed against the cam 149 formed on the output clutch body 146 to engage the output clutch body 146 with the clutch. And a clutch operating shaft 150 that moves the output clutch body 146 to the clutch disengaged position by moving the output clutch body 146 to the clutch disengaged position by moving the output clutch body 146 to the clutch disengaged position while releasing the pressing on the cam 149 by being moved to the extraction position. ing. That is, the clutch pawl 144 is engaged with the pawl hole 145 to transmit power when the spring receiver 143 is located at the set phase after the clutch operating shaft 150 is pulled out. L denotes an elevating lever for operating the planting clutch 127 and a control valve (not shown) for the lift cylinder 4 in relation to each other, and is provided so as to project right and left outward from the steering handle 10.
[0085]
[Another embodiment]
INDUSTRIAL APPLICABILITY The present invention can be applied to a paddy working machine other than a rice transplanter, such as a direct sowing machine.
[Brief description of the drawings]
Fig. 1 Side view of rice transplanter
FIG. 2 is a plan view of a rice transplanter.
FIG. 3 is a cutaway side view of a main part.
FIG. 4 is a plan view of a main part.
FIG. 5 is a longitudinal sectional side view of a main part.
FIG. 6 is an enlarged longitudinal sectional view of a main part.
FIG. 7 is an enlarged plan view of a main part.
FIG. 8: Transmission system diagram
FIG. 9 is a longitudinal sectional view of a transmission operation unit.
FIG. 10 is a cross-sectional plan view of a detent.
FIG. 11 is a longitudinal sectional side view of a transmission case.
FIG. 12 is a longitudinal sectional front view of a transmission case.
FIG. 13 is a longitudinal sectional front view of a transmission case with an attachment shaft removed.
FIG. 14 is a longitudinal rear view of the mission case.
FIG. 15 is a cross-sectional plan view of the mission case.
FIG. 16 is a schematic plan view showing the operation of a side clutch operation system.
FIG. 17 is a sectional view of a transmission system to a working device.
FIG. 18 is a sectional view of a transmission system to a working device.
[Explanation of symbols]
6 Drive rear wheels
59 Side clutch
108 output body
107 Input body
54 counter shaft
53 Chain drive mechanism
18 Mission case
85 Power take-off shaft
89 Permanent shaft
90 Attachment axis
86 brake
79 Transmission chain
80 Tightener
84 Tie toner holder
2 Paddy field work equipment
125 output shaft
127 work clutch
146 Output clutch body
147 key
119 input shaft
126 Torque limiter
29 Output shaft
30 Torque generator
5 Steering wheels
31 Steering operation axis
42 Boss
43 Support part
44 Buffer space
45 connecting passage
49 Transmission
18A case wall
64 shift axis
65 circumferential groove
66 balls
67 Detent
68 spring
69 grooves
70 volts
71 Cover plate

Claims (9)

A side clutch is interposed in each of the transmission systems to the left and right driving rear wheels, and each of the output members on the lower transmission side of these side clutches is shifted along the axial center direction to thereby input the upper transmission. A paddy field working machine configured as a shift body that can be switched between a transmission state and a non-transmission state with respect to the body. A side clutch is interposed in each of the transmission systems to the left and right driving rear wheels, and a counter shaft for distributing power to these side clutches is provided.The power for taking out the power to the chain transmission mechanism to this counter shaft out of the transmission case Paddy field machine with a take-out shaft. The power take-off shaft is a permanent shaft held in a transmission case, and an attachment that can be taken out of the transmission case in an interlocked state while being supported by the transmission case in an interlocked state in which the power take-off shaft can be interlocked with and released from the permanent shaft. The paddy field working machine according to claim 2, comprising a shaft. The paddy working machine according to claim 2 or 3, further comprising a brake capable of braking and releasing the power take-off shaft. A side clutch is interposed in each of the transmission systems to the left and right driving rear wheels, and a counter shaft for distributing power to these side clutches is provided.As a transmission mechanism for this counter shaft, a transmission chain and a tighter acting on it are provided. A paddy working machine provided with a chain transmission mechanism, and a transmission case in which the chain transmission mechanism is installed, and a tight toner holding portion is integrally formed. The transmission system to the paddy field working device that is linked to the traveling unit, the fixed position stop type that allows the transmission and interruption of the transmission to the paddy field working device only when the output shaft to the paddy field working device is in the set phase state with respect to the transmission case A paddy working machine in which a work clutch is interposed and an output clutch body of the work clutch is prevented from rotating with respect to the output shaft by a key. As a transmission system to the paddy field working device interlocking with the traveling unit, a work clutch having an input shaft having a left-right posture and an output shaft having a front-rear posture is provided, and a work clutch for intermittently transmitting power to the output shaft based on an operation. And a torque limiter that automatically switches to a transmission cutoff state when a load greater than a set load acts on the output shaft.A paddy field arranged in a state concentric with the axis of the output shaft and aligned along the axis. Work machine. A torque generator for power steering is mounted on the upper part of the transmission case that can be split into two parts, with its output shaft protruding into the transmission case. The upper end of the steering shaft, which transmits the rotation of the output shaft to the steered wheels, is rotatably held by a boss portion connected to the transmission case, and the lower surface of the torque generator and the boss portion are supported by the transmission case. A paddy working machine which forms a buffer space communicating with the outside between the supporting member and the supporting member, and forms a communication passage for communicating the inside of the transmission case with the buffer space in the left and right split surfaces of the supporting member. . A plurality of circumferential grooves formed on a case wall of a transmission case in which a gear shift type transmission is mounted, in which a shift shaft for operating the transmission is held in a state of penetrating the inside and outside of the transmission case, and formed in a circumferential surface of the shift shaft in parallel with an axial center. A detent is provided for holding the shift shaft in each shift position in a state in which the shift movement based on the operation of the shift shaft is allowed by selectively elastically engaging the ball held on the case wall with respect to the ball. A groove is formed in the case wall to allow the ball to move freely in the direction of engagement and disengagement and to hold the spring in order to hold the spring that moves and urges it in the engagement direction to the case wall. A paddy field working machine provided with a lid plate which is closed and connected to prevent the ball and the spring from coming off the groove by closing the groove.

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