JP3541169B2 - Agricultural work equipment steering device - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a steering device for an agricultural work machine including a pair of right and left crawler-type traveling devices.
[0002]
[Prior art]
As the steering device, for example, as disclosed in Japanese Patent Application Laid-Open No. 7-47973, a pair of left and right crawler type traveling devices are each provided with a side clutch, and one of the side clutches is disengaged. Slow turning drive means for driving the traveling device in the same direction as the operation direction of the other traveling device without the side clutch disengaged and at a lower speed than its operating speed, and braking one traveling device with the side clutch disengaged A braking mechanism as a rapid turning drive means, and when the steering operation tool is operated in a first operation area deviated to one of left and right from a neutral position, a side clutch of one of the traveling devices is disengaged, and a subsequent second operation area is provided. Is operated, the traveling device with the side clutch disengaged is decelerated by the slow turning drive means. The cut was traveling device of Chi to braking by the braking mechanism, a steering operating member and the side clutch, slow turning drive means, and, that in conjunction with the braking means is proposed.
[0003]
[Problems to be solved by the invention]
The steering device has excellent operability because the turning function gradually increases as the operation amount of the steering operation tool increases, and the turning operation can be performed in accordance with the steering operation amount. When shifting from the turning mode of the first operating range to the turning mode of the second operating range, the side clutch gear constituting the side clutch is further shifted from the clutch disengaged position and meshes with the side gear from the axial center direction. Since the mode is switched to the deceleration driving state, an impact or biting sound is generated in which the side clutch gear bites into the side gear, and a slight shock may be accompanied with the turning of the aircraft.
[0004]
The present invention has been made in view of such a point, and it is possible to perform a body turning corresponding to a steering operation amount and to operate a farm work machine capable of performing a delicate and smooth body steering. The main purpose is to provide an orientation device.
[0005]
[Means for Solving the Problems]
[Structure, operation and effect of the invention according to claim 1]
[0006]
(Structure) In the steering device for an agricultural work machine according to the first aspect of the invention, each of the pair of left and right crawler-type traveling devices is provided with a side clutch, and one of the traveling devices with the side clutch disengaged is decelerated. Alternatively, a turning transmission means for braking or reverse driving is provided, and when the steering operation tool is operated from the neutral position to one of left and right, first, the side clutch of one of the traveling devices is disengaged, and then the steering operation tool is continuously operated. Is operated in the same direction, in a steering device of an agricultural work machine configured to interlock and connect the traveling device with the side clutch disengaged and the turning transmission means via a turning clutch, A transmission member for distributing the shifting power to the left and right traveling devices, and a pair of left and right side clutch gears disposed on both sides of the transmission member so as to be able to disengage. The turning clutch is constituted by a multi-plate clutch which is operated to be engaged by supplying hydraulic oil, and a slip-enabled low torque transmitting means for constantly transmitting a low torque to the traveling device regardless of the on / off state of the side clutch. A feature is provided in the turning clutch, and a friction plate on a driven side of the turning clutch is externally supported on a tooth portion of the side clutch gear.
[0007]
(Operation) According to the above configuration, for example, by operating the steering operation tool from the neutral position to the right, first, the right side clutch is disengaged. In this case, the left side clutch on which the side clutch is not disengaged is disengaged. In the turning clutch, the left low torque transmitting means functions, and a part of the power to the left traveling device is reversely transmitted to the left turning clutch via the left low torque transmitting means. Here, since the drive sides of the left and right turning clutches are in a parallel relationship with each other and are interlockingly connected to any of the left and right traveling devices, the left low torque transmitting means is connected to the left turning clutch as described above. The reversely transmitted power is sneak-transmitted to the right-side turning clutch, and the sneak-transmitted power is disengaged via the low-torque transmitting means provided on the right-side turning clutch. It is transmitted to the device.
[0008]
Therefore, the one traveling device does not suddenly stop due to the traveling load as soon as the side clutch is disengaged, and the low torque driving force of the one traveling device receiving the low torque driving force and the side clutch The body turns slowly due to a difference between the driving force of the other traveling device that is not cut and the driving force.
[0009]
Further, when the steering operation tool is continuously operated in the same direction, the traveling device with the side clutch disengaged is interlocked with the turning transmission means, and the traveling device with the side clutch disengaged is driven by deceleration or braking, or The body is reliably rotated by the left and right traveling devices driven with a difference in speed.
[0010]
In this case, the switching from the one-drive swing mode with the side clutch disengaged to the two-drive swing mode with a speed difference is due to the turning clutch being engaged. Since it is based on a plate friction type, it can be performed smoothly without impact compared to a meshing type clutch.
[0011]
Also, when returning the steering operating tool to neutral and returning to straight running, since the low torque is transmitted to the traveling device with the side clutch disengaged, even if the side clutch is of the occlusal type, Occlusion is performed in a state where the speed difference between the motor and the driven side is small.
[0012]
Further, since the driven friction plate of the turning clutch is externally supported on the tooth portion of the side clutch gear, a member such as a spline boss dedicated for supporting the driven friction plate becomes unnecessary.
[0013]
(Effects) Therefore, according to the first aspect of the present invention, it is possible to perform the turning of the body corresponding to the steering operation amount, and to perform the continuous transmission of the torque to the traveling device in which the side clutch is disengaged, so that there is no impact. Subtle and smooth aircraft steering was achieved, and the operability was further improved. Also, when returning to straight ahead after the turning of the aircraft, smooth engagement of the side clutch can be expected.
[0014]
Also, the power to the traveling device on the side where the side clutch is not disengaged is transmitted to the traveling device on the side where the side clutch is disengaged by way of the turning clutch and the low torque transmission means provided on the turning clutch. In this case, the transmission system in which the sneak transmission path for low torque power is originally provided is used, so that the desired function can be exhibited with a simple structure, and practical convenience is high.
[0015]
Further, the tooth portion of the side clutch gear can be used also as a support portion for the friction plate on the driven side of the turning clutch, so that the number of parts can be reduced and the structure can be simplified.
[0016]
[Structure, operation and effect of the invention according to claim 2]
[0017]
(Structure) The steering apparatus for an agricultural work machine according to the second aspect of the present invention includes the work mode selection means according to the first aspect of the present invention, wherein when the work mode selection means is selected to the “standard” work mode, When the steering operation tool is operated in the first operation area near the neutral position, a gentle turning state in which only the side clutch is disengaged is provided, and when the steering operation tool is operated beyond the first operation area, the side clutch is disengaged. The turning characteristic is set such that the traveling device on the set side is interlocked with the turning transmission means via the turning clutch, and when the work mode selecting means is selected to the "wet paddy" work mode, the steering operation is performed. When the tool is operated in the first operation area, one of the side clutches is disengaged, and the traveling device on the side where the side clutch is disengaged is driven by the turning clutch through the turning clutch. A turning characteristic linked to the transmission means is set.
[0018]
(Operation) According to the above configuration, the “standard” operation mode is selected in a dry field or a wetland where the airframe sinks less, and the “wetfield” operation mode is selected in a wetland where the airplane sinks greatly. In the "standard" work mode, the airframe steering can be performed with the characteristics as described in the section of (action) of the first aspect of the present invention. The turning state after turning off only does not appear, and a turning state in which the traveling device inside the turning is forcibly driven by the power from the turning transmission means from the time of operating the first operation area is brought about. In other words, if only one side clutch is disengaged in a wet field and the vehicle turns, the digging and muddy approach by the traveling device will increase, making it difficult to turn the aircraft as expected, but turning with the side clutch disengaged If the inner traveling device is forcibly driven at a low speed, the aircraft can be reliably turned without causing the above-described phenomenon.
[0019]
(Effects) Therefore, according to the second aspect of the present invention, it is possible to perform an aircraft turning with turning characteristics suitable for field conditions, and it is possible to configure an easy-to-use steering device having excellent turning performance.
[0020]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 is a right side view of a combine, which is an example of an agricultural working machine to which the present invention is applied. This combine combines a cutting pre-processing unit 3 with a front part of a traveling machine body 2 having a pair of right and left crawler-type traveling devices 1L and 1R so as to be able to move up and down, and a threshing device 4 and a grain tank on the machine body. 5, engine 6, control unit 7, etc.
[0021]
Hereinafter, the transmission structure of the traveling devices 1L and 1R will be described with reference to FIGS. 2, 3, and 4. However, the description in the left-right direction in the description is based on the left-right direction with respect to the airframe, and when viewed from the front. Are opposite to the left and right directions in FIG.
[0022]
The power of the engine 6 is transmitted to a hydrostatic continuously variable transmission (HST) 8 as a main transmission capable of switching between forward and reverse, and the transmission output is input to a transmission case 9. The power input to the transmission case 9 is transmitted to the first shaft 10 via gears G1 and G2, and then transmitted to the auxiliary transmission mechanism 11 via gears G3 and G4. Further, of the power taken out of the case from the first shaft 10, only the forward rotation power is transmitted to the cutting pre-processing unit 3 via the one-way clutch OC. The hydrostatic continuously variable transmission 8 is operated by a main transmission lever 15 provided in the control section 7.
[0023]
The sub-transmission mechanism 11 performs three-stage gear shifting in a constant mesh manner. The sub-transmission mechanism 11 includes a small-diameter gear G5, a medium-diameter gear G6, and a large-diameter gear G7, which are loosely mounted on the second shaft 12, and the third shaft 13 The gears G8, G9, and G10 fixed on the second shaft 12 are always engaged with each other, and the two shift sleeves S1 and S2 provided on the second shaft 12 are shifted so that one of the three normally meshed gear pairs is shifted. The transmission is configured to perform three-stage transmission from the second shaft 12 to the third shaft 13 using the transmission. The auxiliary transmission mechanism 11 is operated by an auxiliary transmission lever 16 provided in the control unit 7.
[0024]
The power transmitted to the third shaft 13 is transmitted to the center gear G11 of the fourth shaft 19 via the central gear G9, and then the left and right side clutches 20L and 20R, the axle gears 21L and 21R, and the axle. The power is transmitted to the left and right traveling devices 1L and 1R via the 22L and 22R.
[0025]
The side clutches 20L, 20R are loosely fitted to the fourth shaft 19 and shift the side clutch gears 23L, 23R always engaged with the axle gears 21L, 21R to shift the center gears, which are transmission members for power distribution. The power transmission from the center gear G11 to the axles 22L and 22R is interrupted by engaging and disengaging the center internal teeth of G11 from the side, and means for shifting the side clutch gears 23L and 23R is provided. It is configured as follows.
[0026]
The fourth shaft 19 is configured as a stepped shaft having a large diameter at a central portion, and the side clutch gears 23L and 23R are externally fitted over a large diameter portion and a small diameter portion of the fourth shaft 19. Oil chambers g and h are provided between the stepped portions. Normally, the springs 24L and 24R slidably urge the center gear G11 side to be held at the clutch engagement position, and the oil chambers g and g are provided through oil passages a and b formed inside the fourth shaft 19. When the pressure oil is supplied to h and each of the side clutch gears 23L, 23R is shifted to the limit against the springs 24L, 24R, the clutch is disengaged from the center gear G11 and a clutch disengaged state is brought about. When the side clutch gears 23L, 23R are shifted to the clutch disengaged position, the oil passages a, b for supplying pressure oil are connected to an oil passage d formed inside the fourth shaft 19. It has become.
[0027]
After reaching the clutch disengagement position where the side clutch gears 23L and 23R are disengaged from the center gear G11, the side clutch gears 23L and 23R are mounted on the turning side gears 25L and 25R loosely fitted to both end portions of the fourth shaft 19. The connection can be made via plate-type turning clutches 30L and 30R.
[0028]
The turning clutches 30L, 30R have disk-shaped pistons 32L, 32R fitted inside large-diameter clutch case portions 31L, 31R integrally connected to the side surfaces of the turning side gears 25L, 25R, respectively. A plurality of driving-side friction plates 33L, 33R are engaged and supported on the outer periphery of the driving-side friction plates 31L, 31R, and a plurality of driven-side friction plates 34L, 34R joined to the driving-side friction plates 93L, 93R are connected to side surfaces. The clutch gears 23L and 23R have a structure in which the clutch gears 23L and 23R are directly engaged with outer teeth. Here, as shown in FIG. 4, the driven side friction plates 34L and 34R have communication holes 38 formed at a plurality of positions in the circumferential direction at an intermediate portion between the friction transmission portion and the center fitting hole. The lubricating oil inside can freely enter and exit the clutch internal space to cool the friction surface and lubricate well when disengaging the clutch, and to prevent oil from being enclosed in the clutch internal space. , The operation of the pistons 32L, 32R is prevented from being adversely affected.
[0029]
The oil chambers i and j for operating the pistons 32L and 32R of the turning clutches 30L and 30R communicate with the oil passages a and b for supplying pressure oil to the side clutches 20L and 20R via throttle passages k and m, respectively. It is connected.
[0030]
Further, springs 35L, 35R for pressing the pistons 32L, 32R toward the friction plate side, that is, toward the clutch engagement side, are incorporated in a plurality of circumferential positions inside the turning clutches 30L, 30R. 32R is lightly pressed against the friction transmission portion so that low-torque power transmission is always performed between the turning side gears 25L, 25R and the side clutch gears 23L, 23R.
[0031]
The turning side gears 25L, 25R are engaged with the gears 37L, 37R fixed to both ends of the fifth shaft 36, and the gear G13 loosely fitted on the fifth shaft 36 is connected to the center gear G11. The gear G12 is engaged with a small-diameter gear G12 connected to the section and is interlocked with the gear G12.
[0032]
Between the gear G13 and the fifth shaft 36, there is provided a multi-plate type clutch SC which performs gentle turning. In this clutch SC, the piston 42 is normally retracted and returned by the spring 41 provided therein, and the clutch SC is maintained in the disengaged state, and the pressure oil is supplied through the oil passage c formed inside the fifth shaft 36. As a result, the piston 42 is displaced against the spring 41 and is switched to the clutch engaged state.
[0033]
Further, on the right side of the transmission case 9, a multi-plate type braking mechanism B for controlling pivoting is provided. In the braking mechanism B, the ring-shaped piston 43 advances toward the inside of the case by the application of oil pressure, and presses and displaces the pressing plate 44 against the internal spring 45, so that the fifth shaft 36 has a friction braking action. In addition, braking is released when the application of the hydraulic pressure is released and the pressing plate 44 is returned and retracted by the internal spring 45.
[0034]
FIG. 5 shows a hydraulic circuit diagram and a control system diagram for turning for operating the side clutches 20L and 20R, the turning clutches 30L and 30R, the clutch SC, and the braking mechanism B. In FIG. 5, V1 denotes a steering switching valve for selectively shifting the side clutch gears 23L, 23R of the side clutches 20L, 20R. An electric actuator A1 such as a motor selectively operates three positions: neutral, forward and reverse. V2 is a swing mode switching valve for selectively switching the swing mode by selectively supplying pressure oil to either the clutch SC or the braking mechanism B, and is normally urged to the pressure oil supply position to the clutch SC, and The position of the hydraulic oil supply to the brake mechanism B is switched by an electric actuator A2 such as a solenoid or an electric motor disposed outside the cylinder 9.
[0035]
V3 in FIG. 5 is a sequence valve connected to an oil passage d formed inside the fourth shaft 19, and its operating pressure is controlled by the side clutch gears 23L and 23R of the side clutches 20L and 20R. The pressure is set to shift to the clutch disengagement position and balance with the spring 24. A variable relief valve V4 is connected to the lower side of the sequence valve V3, communicates with a transmission case 9 also serving as a hydraulic oil tank, and an oil passage branched from between the sequence valve V3 and the variable relief valve V4. e is connected to the primary side of the swing mode switching valve V2. The operating pressure of the variable relief valve V4 is adjusted by an electric actuator A3 such as an electric motor.
[0036]
The electric actuator A1 for operating the steering switching valve V1, the electric actuator A2 for operating the mode switching valve V2, and the electric actuator A3 for operating the variable relief valve V4 include a steering operation provided in the handle tower 46 of the steering unit 7. The control device 49 is electrically connected to a potentiometer 48 as a sensor for continuously detecting the operation position of the steering lever 47 so as to be controlled according to the left and right operation position of the steering lever 47 as a tool. I have. Further, the control device 49 is connected to a work mode selection switch 50 for switching a turning characteristic according to a work situation.
[0037]
Note that the steering lever 47 is configured as a cross control lever that can swing not only in the left and right directions but also in the front and rear directions. The swinging operation forward from the neutral position lowers the mowing pre-processing unit 3, and The raising / lowering control means is operated based on detection information of a not-shown front / rear operation position detection sensor so that the pre-cutting unit 3 is raised by a swinging operation from the neutral position to the rear.
[0038]
Reference numeral 51 in FIG. 2 denotes a brake for stopping the vehicle and a parking brake disposed to act on the end of the third shaft 13, and the depressing operation of a stop pedal 52 provided at the foot of the control unit 7. As a result, the main clutch (not shown) provided in the transmission system from the engine 6 to the hydrostatic continuously variable transmission 8 is disengaged and the brake 51 is braked. The parking brake can be applied by locking and holding the pedal 52 at the depressed position.
[0039]
The steering apparatus according to the present invention is configured as described above. Next, the steering operation will be described. The work mode selection switch 50 is set to the "standard" work mode when working in a dry field or a wetland where the machine sinking is small, and to the "wetland" work mode when working in a wetland where the machine sinking is large. In the following description, the state has been switched to the "standard" work mode.
[0040]
When the steering lever 47 is in the neutral position n, the side clutches 20L and 20R are both in the clutch engaged state, the left and right crawler traveling devices 1L and 1R are driven at the same speed, and the aircraft travels straight.
[0041]
When the steering lever 42 is swung from the neutral position n to one of the left and right directions, for example, to the first operation range Lc on the left side, this is detected by the potentiometer 48, and the electric actuator A1 is energized to drive the steering switching valve V1. Is switched to the left turning position. As a result, the pressure oil is supplied to the oil chamber g via the oil passage a, the side clutch gear 23L is shifted to the latching position, and the left side clutch 20R is disengaged. Therefore, only the left crawler traveling device 1L enters the idle state, and the body slowly turns leftward by driving only the right crawler traveling device 1R.
[0042]
In this case, low torque transmission is performed via the spring 35R in the right turning clutch 30R in which the side clutch 23R is not disengaged, and a part of the power of the side clutch gear 23R is transmitted to the steering side gear 25R. This is transmitted through the gear 37R, the fifth shaft 36, the gear 37L, and the turning side gear 25L to the left turning clutch 30L. This wraparound power is transmitted to the side clutch gear 23L at the clutch disengaged position by light frictional transmission via the spring 35L, and the left crawler traveling device 1L receives low torque power transmission. Therefore, the left crawler traveling device 1L receives the low-torque power transmitted from the power of the right traveling device 1R and operates the side clutch 23L to be disengaged, and the side clutch 23L is disengaged to transmit the main power. As a result, the crawler traveling device 1L does not completely stop due to the traveling load as soon as it is interrupted, and the shock caused by the disengagement operation of the side clutch 23L is reduced.
[0043]
If the left side clutch 20L is kept disengaged for a long time, the position of the pressure oil supplied to the oil passage a is also gradually supplied to the oil chamber i of the left turning clutch 30L via the throttle passage k. When the steering lever 47 is in the first operating range Lc, the operating pressure of the variable relief valve V4 is still low while the steering lever 47 is in the first operating range Lc, so that hydraulic oil is supplied via the mode switching valve V2. The clutch SC in the receiving state does not operate to engage the clutch, and the fifth shaft 36 and the gear 37L are not driven strongly by the power from the center gear G11. Therefore, in this state, the turning operation of the turning clutch 30L does not contribute to the steering of the aircraft.
[0044]
When the steering lever 47 is operated to the second operation range Ls, the relief pressure of the variable leaf valve V4 is changed to a value exceeding the operating pressure of the sequence valve V3, and the high pressure oil flows through the oil passage e and the oil passage c. The clutch SC is supplied to the clutch SC and the clutch SC is operated. When the clutch SC is engaged, the fifth shaft 36 is driven strongly by the power from the center gear G11, and the turning side gear 25L interlockingly connected to the fifth shaft 36 via the gear 37L is driven at a predetermined low speed. Is done. Therefore, the low-speed power of the turning side gear 25L is transmitted to the side clutch gear 23L at the clutch disengaged position via the turning clutch 30L, and the left crawler traveling device 1L is decelerated at a predetermined ratio in the low speed state by the right crawler. The vehicle is driven in the same direction as the traveling device 1R, and the aircraft slowly and reliably turns leftward based on the difference in driving speed between the left and right crawler traveling devices 1R and 1L.
[0045]
In this case, when the steering lever 47 in the neutral position n is operated to the second operation range Ls at a stretch, the left side clutch 20L is disengaged and the clutch SC is immediately engaged and actuated as described above, and the left side turning operation is performed. The clutch 30L is also operated to engage the clutch. However, the pressure oil in the oil passage a is gradually supplied to the oil chamber i having a large cross-sectional area in the turning clutch 30L via the throttle passage k. The operation for engaging the clutch is performed slowly and smoothly. Accordingly, the power transmitted to the turning side gear 25L via the clutch SC is transmitted to the side clutch gear 23L without impact, and the left crawler traveling device 1L smoothly enters the deceleration driving state.
[0046]
Here, since the hydraulic pressure applied to the clutch S is limited by the variable relief valve V4, the hydraulic pressure applied to the clutch SC decreases as the steering lever 47 in the second operation range Ls is closer to the neutral n side. , The torque transmitted via the clutch SC is small, and as the steering lever 47 in the second operation range Ls moves away from the neutral position n, the hydraulic pressure applied to the clutch SC increases, and the left crawler travels via the clutch SC. The torque transmitted to the device 1L gradually increases. Eventually, the clutch SC is completely connected, and the left crawler traveling device 1L is driven at a low speed at a reduced speed at a predetermined ratio.
[0047]
When the steering lever 47 is operated beyond the second operation range Ls to the third operation range Lb, this is detected by the potentiometer 48, and the electric actuator A2 is energized and driven, and the mode switching valve V2 is switched, and the oil passage e is connected to the oil passage f to supply the pressure oil to the braking mechanism B, and the oil passage c connected to the clutch SC is connected to the drain passage D to disconnect the clutch SC. In this case, since the relief pressure has already been increased due to the large operation of the steering lever 47, the fifth shaft 36 is braked by the braking mechanism B, and the left side which is interlocked and connected to the fifth shaft 36 Is driven, only the right crawler traveling device 1R is driven, and the aircraft makes a sharp left turn (radical turn).
[0048]
When the steering lever 47 is returned to the neutral position n from the body steering state, the left side clutch 23L that has been disengaged is engaged, and returns to the straight traveling state. In this case, the left turning clutch is used. In the turning clutch 30L, a low torque is transmitted, and the left side clutch gear 23L is slightly rotated. Therefore, the speed difference between the center gear G11 and the side clutch gear 23L causes the side clutch gear 23L to stop. And the side clutch gear 23L smoothly re-engages with the center gear G11 without causing poor occlusion.
[0049]
Needless to say, even when the steering lever 47 is operated in the right turning direction, similarly to the above, in the first operation region Rc, a gentle right turning is performed by disengaging only the left side clutch 20R. In the second operation range Rs, the clutch SC is engaged and the right crawler traveling device 1R is decelerated to perform a right turn by decelerating the right crawler traveling device 1R. A sharp turn to the right (brake turn) with braking is performed.
[0050]
The above operation is an operation in which the operation selection switch 50 is set to “standard”. In a deep wetland, by switching the operation selection switch 50 to “wetland”, the characteristics of the turning operation are changed as follows.
[0051]
When the work selection switch 50 is set to "wet field", the electric actuator A3 is controlled so that the operating pressure of the variable relief valve V4 is set to be high from the time when the steering lever 47 is at the neutral position n. When the wet field operation mode is set, the clutch SC is immediately engaged from the time when the steering lever 47 is rocked to the first operation range Lc, Rc, and the crawler traveling device inside the turn is decelerated as described above. The body turns based on the drive speed difference between the left and right crawler traveling devices 1R and 1L. Therefore, a smooth and reliable turning can be achieved in which the phenomenon such as digging by the crawler traveling device on the inside of turning, which is observed at the time of turning operation of the body only by disengaging one of the side clutches, muddy sewage, etc. is suppressed.
[0052]
Further, when the steering lever 47 is operated to the second operation range Ls, Rs and the third operation range Lb, Rb or more in the "wet paddy" work mode, the mode switching valve V2 is switched, and as described above, the crawler traveling inside the turning is performed. The turning is performed by braking the device and driving only the outer crawler traveling device (spinning turning).
[0053]
The present invention can be implemented in the following forms.
[0054]
(1) In the above embodiment, the left and right swingable steering lever 47 is used as the steering operation tool. However, a steering wheel that is rotated can be used as the steering operation tool.
[0055]
(2) The third operating ranges Lb and Rb can be implemented by setting the traveling device on the side where the side clutch is disengaged to a super pivot turn mode in which the traveling device is decelerated and reversed.
[0056]
(3) The third operation areas Lb and Rb are set to the brake turning mode for braking the traveling device on the side where the side clutch is disengaged as described above, and the side clutch is further disposed outside the third operation areas Lb and Rb. It is also possible to provide a fourth operation area in the pivot turn mode in which the traveling device on the cut side is decelerated and reversely driven. However, in this case, it is necessary to equip the fifth shaft 36 with a reverse clutch for turning on and off the reverse power.
[Brief description of the drawings]
FIG. 1 is a right side view of the whole combine. FIG. 2 is a schematic front view showing a transmission structure of a traveling transmission case. FIG. 3 is a front view showing the left and right side clutches and a turning clutch. FIG. Front view in which the vicinity of the clutch and the turning clutch is enlarged. [FIG. 5] Configuration diagram of a steering hydraulic circuit and a control system.
1L, 1R Traveling device 20L, 20R Side clutch 23L, 23R Side clutch gear 30L, 30R Turning clutch 34L, 34R Driven friction plate 47 Steering operation tool G11 Transmission member (center gear)

Claims (2)

Each of the pair of left and right crawler-type traveling devices is provided with a side clutch, and turning transmission means for decelerating, braking, or reversely driving one of the traveling devices with the side clutch disengaged is provided. When the operating device is operated left or right from the neutral position, first, the side clutch of one traveling device is disengaged, and when the steering operating device is continuously operated in the same direction, the traveling device disengaged the side clutch. And the turning transmission means and the steering device of the agricultural working machine configured to interlock and connect via a turning clutch,
The side clutch comprises a transmission member that distributes shifting power to the left and right traveling devices, and a pair of left and right side clutch gears disposed on both sides of the transmission member so as to be able to be disengaged.
The turning clutch is constituted by a multi-plate clutch which is operated to be engaged by supplying hydraulic oil, and a low torque transmitting means capable of constantly transmitting a low torque to the traveling device regardless of whether the side clutch is engaged or disengaged. Equipped on the clutch,
A steering device for an agricultural work machine, wherein a driven friction plate of the turning clutch is externally fitted and supported on a tooth portion of the side clutch gear. It is a steering device of the agricultural working machine of Claim 1, Comprising:
A work mode selection means, wherein when the work mode selection means is selected to the "standard" work mode, when the steering operating tool is operated to the first operation area close to the neutral position, only the side clutch is disengaged. When a turning state is brought about and operated beyond the first operation range, the turning device in which the side clutch is disengaged is interlocked to the turning transmission means via the turning clutch. Is set, and when the operation mode selection means is selected to the "wet paddy" operation mode, when the steering operating tool is operated in the first operation range, one of the side clutches is disengaged and the side clutch is disengaged. A steering device for an agricultural work machine in which a turning characteristic is set such that the traveling device on the side of the set is interlockedly connected to the turning transmission means via the turning clutch.

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