JP3505819B2 - Work vehicle steering operation device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steering operation device for a working vehicle.
About the installation. 2. Description of the Related Art In a conventional steering operation device for a work vehicle, a power transmission
The system can be switched between braking swing mode, slow swing mode, and reverse swing mode.
Setting means for setting the
Dynamic turning mode, slow turning mode, reverse turning mode are optional
Control means that is executed in conjunction with the turning side of
With the turning direction selection lever to select the left or right turning direction.
Each time the operator makes a turn,
Which of the above three turning patterns
Setting, and then use the turning direction selection lever to set
In a turning direction. [0003] The work vehicle described above
The steering operation device switches from straight running to the turning direction selection lever.
When making a cornering turn, switch from the braking corner mode to another gentle
Control mode or reverse rotation mode, and then turn again.
If turning is desired in the dynamic turning mode, the setting means is braked.
The operation must be switched to the turning mode side,
There was a drawback that it was very complicated. The present invention
It is intended to solve such a problem. [0004] The work vehicle according to the present invention
The steering operation device solves the above-mentioned problems.
Therefore, the configuration is as follows. In other words,
Shift the power arbitrarily to the traveling device 1 with the steering operation device of the industrial vehicle
The transmission system is previously loosened in the traveling transmission 11 for
Setting means for setting the turning mode 3 and the reverse turning mode 4
5 and the braking turning mode 2 and the gentle turning mode
3 and the reverse rotation mode 4 are linked to an arbitrary
Control means 100 for setting the position of the setting means 5
In conjunction with the setting, this set, gentle turning mode 3, or
Switches the switching means 7 for executing the reverse rotation mode 4 to the rotation
The working vehicle is provided with a turning direction selection lever 6.
The steering operation device was used. [0005] A pair of left and right traveling devices 1 are made to travel straight, and
Direction selected by direction selection lever 6 (left or right)
When turning, apply braking to the selected one
Braking swing mode 2, slow rotation to decelerate one of the selected modes
Rotation mode 3, reverse rotation mode for driving one of the selected
Transmission 4 in the traveling transmission 11
Is set to the gentle turning mode 3 and the reverse turning mode 4.
Setting means 5 for controlling the braking / turning mode 2 and the gentle turning mode.
Mode 3 and reverse rotation mode 4 in conjunction with any turning side
There is provided a control means 100 for executing. The setting means 5
In conjunction with the set position, this set gentle turning mode
3 or the switching means 7 for executing the reverse rotation mode 4
It is installed on the turning direction selection lever 6. In performing the above-mentioned three turning patterns,
First, the braking swing mode that applies braking to the selected one
In the mode 2, the turning direction selection lever 6 is moved in the turning direction.
It turns by moving it. At this time, turn direction selection
Since the switching means 7 provided on the bar 6 is not operated,
The position of the setting means 5 is set in the gentle turning mode 3 or the reverse turning mode.
It may be located on either side of the card 4. Next, a slow rotation for decelerating the selected one.
In the rotation mode 3, the operator operates the setting
Beforehand, it is operated to the gentle turning mode 3 side. Then go straight
Switching means when turning in any direction selected from the line
7 or simultaneously with the operation,
By operating the selection lever 6 in the turning direction, the turning inside
Is driven slowly, and the slow turning mode 3 is executed. At this time,
Operate the turning direction selection lever 6 before switching means 7
Later, that is, during the turning in the brake turning mode 2,
When the step 7 is operated, the mode is changed to the gentle turning mode 3 and the turning is performed.
You. Next, a reverse rotation for driving the selected one in the reverse direction.
In the turning mode 4, the operator sets the setting means 5
It is previously operated to the reverse rotation mode 4 side. Then
Switching when turning in any direction selected during traveling
After operating the means 7 or simultaneously with the operation,
By operating the direction selection lever 6 in the turning direction, turning
The inside is driven to rotate in the reverse direction, and the reverse rotation mode 4 is executed. This
At this time, the turning direction selection lever 6 is
After operation, that is, during turning in braking
When the switching means 7 is operated, the mode is changed to the reverse rotation mode 4 and
Turn. 1 to 5 show an embodiment of the present invention.
The traveling transmission 11 and its steering operating device are shown.
You. Travel that transmits power to a pair of left and right traveling devices 1
The transmission 11 applies braking to a selected one of the traveling devices 1.
Braking slewing to be applied and gentle slewing to decelerate and drive one selected
And reverse rotation to drive the selected one in reverse
It has a configuration. The configuration of the traveling transmission 11 will be described.
I do. Above the traveling transmission 11, the other end has no hydraulic
A variable hydraulic pump (not shown) that is part of the step transmission
Fixed-type hydraulic motor that rotates by receiving oil
The input shaft 9 where the
You. The input shaft 9 is provided with a speed increasing clutch 12 and a speed increasing clutch.
At both ends of the clutch 12, the speed increasing clutch 12
And the power input to the input shaft 9 is poor.
The low and high speed output gears 13 and 14 that transmit in the direction
Is provided. The speed-increasing clutch 12 is
The clutch case 12a is fixed and the low-speed output gear 13 or
Is a disk (not shown) integrated with the high-speed output gear 14 side
And an integral disk (shown in the figure) on the clutch case 12a side.
) Are alternately arranged in multiples with a slight gap
These discs are connected to pistons 12b or 1
2c presses with hydraulic pressure, so that the disk surfaces
Friction between the clutch case 12a and the low-speed output gear 1
3, or the clutch case 12a and the high-speed output gear 14
And the rotation of the input shaft 9 is controlled by the low-speed output gear 13 or
Is transmitted to the high-speed output gear 14. On the lower side of the input shaft 9 is a low-speed output gear 13.
Gear 15 that meshes with the gear that meshes with the high-speed output gear 14
There is a counter shaft 17 which is integrally linked to the counter shaft 16. Further
The power transmitted to the gear 15 is transmitted to the lower side
Gear 15 a is fixed to the counter shaft 17.
The power transmitted to the gear 16 moves in a downward direction from the gear 15
It is transmitted. The intermediate shaft 2 is located below the counter shaft 17.
There is 0. The power from the gear 15 is applied to the intermediate shaft 20.
Receiving the power from the gear 18 and the gear 15a.
Gear 19a is loosely fitted. The gear 19a has a gear
19 is fixed and rotates together with the gear 19a.
The gear 19 is an output gear when performing the gentle turning mode 3.
It is. [0013] Between the gear 18 and the gear 19,
And an auxiliary shift shifter connectable to the gears 18 and 19.
Is spliced so as to be movable in the longitudinal direction of the intermediate shaft 20.
Are fitted. By selecting the sub-shift shifter 21, the gear
The power transmitted to the gear 18 or the gear 19a is transmitted to the intermediate shaft 2
0, and moves further down the intermediate shaft 20.
A gear 22 for transmitting a force is fixed to the intermediate shaft 20. On the lower side of the intermediate shaft 20, a side clutch shaft 2 is provided.
There are five. The side clutch shaft 25 has the gear 22
Gear 23, which is always meshed with
The gear 24 is fixed to a side clutch shaft 25.
Have been. This gear 24 performs reverse rotation mode 4
This is the output gear. Also, the side clutch shaft 25
A left brake 2L and a left clutch 26L are
The right brake 2R and the right clutch 26R are
is set up. Left brake 2L and left clutch 26L,
The right brake 2R and the right clutch 26R are symmetrical.
Therefore, only the right side will be described. FIG. 5 is an enlarged view of FIG. Right brake 2
R and the right clutch 26R, a side clutch shaft 25
There is a casing 27 loosely fitted in the casing 2
7, a hydraulic chamber 31 is formed on the left side.
In the hydraulic chamber 31, there is a spring 31a, and the left piston
Button 30 with a constant force. Of the casing 27
The outer periphery is covered with a connecting plate 34 (divided into three in this embodiment).
The pressure plate 35 protrudes from some of the cutout holes.
You. The left side of the pressure plate 35 is a right clutch 26R.
You. Here, a disk fixed to the connection plate 34
33a, and the count fixed to the side clutch shaft 25.
It is fixed to the outer periphery of the collar 28 and moves in the longitudinal direction
Multiple possible disks 33b with a slight gap
They are arranged alternately one by one. In addition, to the left
A force plate 35a is arranged, and a part of the force plate 35a is
It protrudes from the notch hole and the side clutch shaft
25 is always connected to the gear 29R loosely fitted. right
When the clutch 26R is used, the casing 27
The oil is supplied to the oil passage 37 provided in the
It is configured to apply pressure. When hydraulic pressure is applied to the hydraulic chamber 31, the piston 3
0 moves to the left and pushes the pressure plate 35 to the left,
33b and disk 33a contact. This allows
The power from the clutch shaft 25 is applied to the counter collar 28.
Then, the disk 33b, the disk 33a, the pressure
The force is transmitted to the gear 29R via the force plate 35a. The
The gear 29R is loosely fitted to the side clutch shaft 25.
Therefore, when the right clutch 26R is not connected,
The gear 29R does not rotate. Next, the right brake 2R will be described.
To the right of the casing 27, via a hydraulic chamber 39, a pin
There is a stone 40. On the right side of the piston 40 is a pressure plate
41 abuts, part of which comes from the hole of the connecting plate 34
It is protruding. The right side of the pressure plate 41 is the right brake 2R.
It is. Here, the disk fixed to the connecting plate 34
42a and a side crack
The cylindrical portion integrally projecting on the same axis as the
A plurality of disks 42b are axially
Is mounted so as to be movable, and
Disks 42b are arranged alternately. In addition, right brake
There is a pressure plate 41a to the right of the key 2R, part of which is connected
It protrudes from the hole of the plate 34. When using the right brake 2R, the case
Oil to the oil passage 36 of the ring 27 and move the piston 30 to the right.
Move to At this time, the oil supply to the oil passage 37 is naturally stopped.
You. When the piston 30 moves to the right, the right clutch 26
The connection between R disk 33a and disk 33b is released.
You. Next, the oil is supplied to the oil passage 38 and the hydraulic pressure is supplied to the hydraulic chamber 39.
The piston 40 is pressed to the right by acting. This
The pressure plate 41 is pressed to the right, and
The plate 34 and the disk 42a fixed to the connecting plate 34
The disk 42a and the disk 42b are pressed to the right.
And the right brake 2R operates. The intermediate shaft 20 and the side clutch shaft 25
There is a shaft 53 at the bottom. The shaft 53 has a tooth of the intermediate shaft 20.
If the gear 54 which is always meshing with the wheel 19 is loosely fitted
Both always mesh with the gear 24 of the side clutch shaft 25
Gear 55 is loosely fitted. This gear 54 and gear
Between 55, gear 56 can move in the longitudinal direction of shaft 53
Is spline-fitted. The left part of the gear 56 has teeth
It has a gentle turning clutch 3a connected to the car 54,
Has a reverse rotation clutch 4a connected to the gear 55.
You. The gear 56 is a gear fixed to the lower shaft 43.
57 is always in mesh with the gear 57 to the shaft 43
The input power is gentle turning or reverse turning. Ma
In addition, the power input to the shaft 43 is
There is a right switching clutch 8R that transmits to the vehicle 45R. Axis 4
The power input to 3 is further transmitted in the lower direction
However, only the right side is explained because it is symmetric.
You. On the other hand, between the gear 57 and the right switching clutch 8R.
Has a gear 44R loosely fitted therein, and the gear 44R has
Car 45R is fixed. This gear 45R is
Always meshes with the gear 29R of the clutch shaft 25,
The power transmitted from the gear 29R to the gear 45R is
This is a so-called straight traveling state. Slow turning and reversing as described above
Gears are used for both turning and straight running power transmission.
It is transmitted to the lower direction via 45R. The gear 44R of the shaft 43 is connected to the lower shaft 48R.
The gear 47R is always engaged with the fixed gear 47R.
At the other end of the shaft 48, a gear 49R is fixed.
The wheel 49R is a gear to which the lower traveling shaft 50R is fixed.
It is in mesh with 51R. The other end of the traveling shaft 50R
The sprocket 52R for driving the roller is fixed.
You. Next, the state of going straight will be described. Set
Power transmitted from the hydraulic motor 10 to the input shaft 9
The low-speed output gear 13
From the gear 15 or from the high-speed output gear 14
The counter shaft 17 is driven via the vehicle 16. The mosquito
The power transmitted to the counter shaft 17 includes the gear 15 and the gear 1
8, or transmitted poorly from the gear 15a and the gear 19a.
You. However, gear 18 and gear 19a are
The intermediate shaft 20 is not rotating.
Therefore, the auxiliary transmission system that is spline-fitted to the intermediate shaft 20 is used.
By moving the lid 21 in the longitudinal direction, the gear 18 or the teeth
Connect to car 19a. Now, the intermediate shaft 20 rotates and the teeth
The wheel 22 also rotates, and the gears 23, 24 and
The id clutch shaft 25 rotates. Thereafter, the power in the poor direction
The transmission path is symmetrical as described above, so only the right side
explain about. As described above, the right clutch 26R is
And therefore the power of the side clutch shaft 25
Is transmitted to the gear 29R. The gear 29R is poor
The gear 44R is rotated via the gear 45R of the shaft 43 of FIG.
You. The gear 44R is a gear fixed to the lower shaft 48R.
When the shaft 48R and the gear 49R are rotated via 47R
In both cases, the gear 49R is fixed to the lower traveling shaft 50R.
And the traveling shaft 50R
Rotates and goes straight. The other end of the traveling shaft 50R has a claw
Sprocket 5 that winds la and caterpillar
2R is fixed. In such straight-ahead condition,
Position of the setting means 5 (hereinafter referred to as setting lever)
You may. A selected one of the left and right traveling devices 1
Brake turning mode 2 in which braking is applied to one side to make a braking turn
And slow rotation to perform gentle rotation by decelerating the selected one
Rotation mode 3 and reverse rotation of the selected one by reverse drive
The electrical configuration for operating the reverse rotation mode 4 is shown in FIG.
I have. Input of control means 100 (hereinafter referred to as CPU)
On the force side, setting lever 5, turning direction selection lever 6, switching
Means 7 is connected, and the left and right
2L, 2R and power of gentle turning and reverse turning
The left and right switching clutches 8L, 8R are connected. The setting lever 5 is provided inside the traveling transmission 11.
Set the transmission system of the mechanism to the slow turning mode 3 or the reverse turning mode.
This is the lever to be set to C4 Further, the setting lever 5
A position sensor (not shown) is installed at the base.
And set the slow turning mode 3 or the reverse turning mode 4
The operating mode is the CPU 100 as an electrical signal.
Is entered. The turning direction selection lever 6 is a turning direction.
Lever for selecting the direction (left or right) and turning direction
It is a configuration that tilts to. Further, the turning direction selection lever 6
A position sensor (not shown) is installed at the base of
Input the direction and amount of tilt to the CPU 100
I do. This turning direction selection lever 6 is basically operated with one hand.
It is a configuration that operates, but this is another
Lever, for example, a throttle that controls the rotation of the engine
This is because a lever or the like may be operated. The switching means 7 is provided on the turning direction selection lever 6.
Slow turning mode 3 or reverse turning mode 4
Is performed together with the turning direction selection lever 6.
It is a configuration to make. In FIG. 2A, the switching means 7 is turned.
One embodiment is shown on a direction selection lever 6. Turning
The turning direction selection lever 6 has a cylindrical shape that can be operated with one hand.
Therefore, the switching means 7 has a corresponding installation method.
You. In this embodiment, the switch is a switch that can be turned on and off by pushing with a thumb.
Therefore, the operator side of the head of the turning direction selection lever 6
It may be on the top of the head. This switch
Press with your thumb to turn on, release your thumb to automatically cut
It is a configuration to return to the state. Thereby, gentle turning mode 3
Switching between the brake turning mode 2 and the reverse turning mode
Switch between mode 4 and braking / turning mode 2 instantly
You. As another switch configuration, if you press with your thumb, it is in the on state
It becomes like a cut off state by pressing again with your thumb
It may be configured. In this case, gentle turning mode 3 or
Can maintain the state of the reverse rotation mode 4. In addition, parents
It may be installed at a position that can be operated with the index finger other than the finger.
No. In this case, the operator of the head of the turning direction selection lever 6
It is configured to be installed on the side opposite to the data side. FIG. 2B shows another embodiment, in which the turning direction is shown.
Tilt the head of the selection lever 6 to the near side or the opposite side.
The switching means 7 is executed by the
You. FIG. 2C shows another embodiment, in which a turning direction selection lever is provided.
-6, the head is moved up and down, and the switching means 7
This is the configuration to be executed. As described above, the turning direction selection lever
-6 and the switching means 7 can be operated with one hand.
However, the switching means 7 is provided in addition to the turning direction selection lever 6.
There is no problem with installation. Next, about the course change to the right
(Since the left side is symmetrical, it is omitted.) First, braking turning will be described. Straight ahead
When the turning direction selection lever 6 is tilted to the right in the
As described above, the connection of the right clutch 26R is released. Only
While the left traveling shaft 50L is driven,
Side running shaft 50R rotates slightly, and
The surrounding rotation causes the gear 29R to rotate. This is turning
Stop the rotation around this radius because the radius increases.
There is a need. So, connect the right brake 2R and drive
The rotation of the shaft 50R is completely stopped. This is the braking turn
is there. At this time, the setting lever 5 can be in any position.
No. Next, the gentle turning will be described. Turn slowly
Setting lever 5 to the gentle turning side before
Good. As a result, the transmission system in the traveling transmission 11 slowly turns.
Set to the side. That is, the gentle turning clutch 3 of the gear 56
a and the gear 54 are connected. In addition, the setting lever 5
Slow turning due to the provision of a position sensor (not shown)
Side operation as an electrical signal to the CPU 100
To enter. To move the gear 56, a shifter (illustrated
This shifter does not use the setting lever 5
It may be mechanically linked to
May be. Also, the power of the gentle turning is the gear 1 of the intermediate shaft 20.
9 is input to the gear 54 at all times.
The power of the bevel gear 54 is transmitted via a gear 56 and a gear 57 to the shaft.
43 is input. In turning slowly, the switching means 7
(Hereinafter, referred to as a changeover switch) to an on state, and thereafter,
Tilt the turning direction selection lever 6 to the right. Or even at the same time
No. Then, the connection of the right clutch 26R is released. This
, The oil is not supplied to the oil passage 38, and the right brake 2R is connected.
do not do. Then, since the right switching clutch 8R is connected,
The power of the shaft 43 is transmitted from the right switching clutch 8R to the gear 45R.
Is communicated. In such a transmission path, the gear 45
The number of rotations input to R is the rotation decelerated from the straight running state
It is input after being reduced to a number, for example, 1/3. Gear 45R
The subsequent transmission path is the same as when traveling straight. This
And the traveling shaft 50R rotates at a reduced speed, so that it turns to the right.
I do. In the course of such a gentle turning (turning method)
The direction selection lever 6 keeps the state inclined to the right), switching
When the switch 7 is turned off, the mode is changed to the braking turning.
That is, the oil supply to the right switching clutch 8R is stopped,
The power of the shaft 43 is not transmitted to the gear 45R. Soshi
Oil is supplied to the oil passage 38, and the right brake 2R is connected.
Because When the changeover switch 7 is pressed again, the rotation is slow.
Turn at times. Next, the reverse rotation will be described. Reverse rotation
Before turning, set the setting lever 5 to the reverse rotation side
Keep it. Thereby, the transmission system in the traveling transmission 11 is
It is set to the reverse rotation side. That is, the reverse rotation of the gear 56
The switch 4a and the gear 55 are connected. Furthermore, setting lever 5
Is equipped with a position sensor (not shown),
The operation to the reverse rotation side is used as an electrical signal as CP.
Input to U100. To move the gear 56,
(Not shown). The power of reverse rotation is the side
Always input from the gear 24 of the clutch shaft 25 to the gear 55
Therefore, the connection between the reverse rotation clutch 4a and the gear 55
The power of the gear 55 is transmitted through the gears 56 and 57,
It is input to the shaft 43. In the reverse rotation, the switching switch
Switch 7 is in the on state, and then the turning direction selection lever 6 is
Flip to the right. Alternatively, they may be simultaneous. Then, the right clutch
26R is disconnected. At this time, the oil is sent to the oil passage 38.
Without oiling, the right brake 2R is not connected. And switch right
Since the clutch 8R is connected, the power of the shaft 43 is switched to the right.
The power is transmitted from the clutch 8R to the gear 45R. like this
Speed input to the gear 45R in a simple transmission path
Is the reverse rotation state opposite to the straight running state, and the rotation is decelerated
It is input after being reduced to a number, for example, 1/3. Gear 45R
The subsequent transmission path is the same as when traveling straight. This
The traveling shaft 50R rotates at a reduced speed in the reverse direction and turns to the right.
You. In the course of such reverse rotation (rotation)
The direction selection lever 6 maintains the state inclined to the right),
When the changeover switch 7 is turned off, it is changed to braking turning.
You. That is, the oil supply to the right switching clutch 8R is stopped.
Thus, the power of the shaft 43 is not transmitted to the gear 45R. So
Then, the oil is sent to the oil passage 38, and the right brake 2R is connected.
It is done. When the changeover switch 7 is pressed again, the reverse is performed.
It turns by rolling turning. The changeover switch 7 is configured as described above.
When turning in braking turning mode 2, set lever
-5 does not need to be operated, and complicated operations are eliminated. Sa
In addition, select the turning direction with one hand for any turning
The lever 6 can be operated, and braking is performed during turning.
Turning mode 2 and gentle turning mode 3, or braking turning mode
2 and reverse rotation mode 4 can be easily switched.
You. The gentle turning and the reverse turning are in the middle of turning.
Can also be switched. That is, the right switching clutch 8
R is connected and turns with gentle or reverse rotation
Operating the setting lever 5 to move the gear 56,
Switching between the gentle turning clutch 3a and the reverse rotation clutch 4a
In the turning state, gentle turning and reverse turning are
Each can be switched. As described above, the braking turning mode 2 and the gentle turning mode
Mode 3 and reverse rotation mode 4 can be switched instantly
So, in which turning mode you are turning,
Know exactly if you are going to turn in different turning modes
It is necessary to keep. Therefore, the turning direction selection lever 6
A display means 6a is provided to inform the operator.
You. With this, it is possible to correctly determine which turning means is turning.
It can be grasped reliably and danger can be prevented. Next, FIGS. 6 to 8 will be described. Obedience
Next, when performing a gentle turn, tilt the turning direction selection lever 6
Disengage the right clutch 26R according to the angle, and then switch to the right
The clutch 8R was connected. However, this configuration
Then, the right switching clutch 8R is connected at a stretch as shown in FIG.
And the connection of the entire aircraft causes a shock,
Vibration is transmitted to the operator who is
Did not. Therefore, as shown in FIG.
Operate the right brake 2R before connecting the latch 8R.
Configuration. Moreover, the connection pressure of the right brake 2R
Is determined by the proportional pressure reducing valve 60R, and
Apply braking so that they are almost the same (for example, 1/3 deceleration rotation).
I can. Thereafter, a fixed tilt angle 6 of the turning direction selection lever 6 is set.
From 1 to 61a, release the braking of the right brake 2R
And the connection pressure of the right switching clutch 8R rises.
I will raise it. Also, as shown in FIG.
Right switching clutch 8R is completely connected to release 2R braking
Connected or connected at a constant pressure
(Not shown). This allows
When performing gentle turning, the connection of the right switching clutch 8R is short-circuited.
Is almost eliminated. The inclination angles 61 and 6 in FIG.
1a is at the position of the position sensor of the turning direction selecting means 6.
The tilt angle is set only for 61,
After that, the braking of the right brake 2R is released for a certain period of time.
The right switching clutch 8R may be connected. FIG. 8 shows that the above-mentioned right switching clutch 8R is turned on.
Before starting pressure oil to perform the right brake 2R
The method of operation is shown. Of the turning direction selection lever 6
The right shake corresponds to the position of the position sensors 58 to 59.
The key 2R operates. At this time, the right brake 2R decreases proportionally
Since it operates by the pressure reducing valve 60R, the flow to the proportional pressure reducing valve 60R
Control the amount of current (on-duty ratio)
You. As described above, even at the time of gentle turning, the right
With the introduction of the rake 2R, the setting lever 5 moves to the gentle turning side.
Go straight while operating and make small direction corrections.
In response, the right brake 2R operates,
Good direction correction can be made. In particular, the
Vine makes it easy to align the culm during harvesting
It becomes. From the configuration described above, the braking swing mode 2
It is necessary to operate the setting lever 5 when turning with
There is no need for complicated operations. The present invention is constructed as described above.
When turning in the dynamic turning mode 2, the setting lever 5 is
Since there is no need to perform operations, complicated operations are eliminated. Further
When performing any of the turns, select the turning direction with one hand.
The bar 6 can be operated, and braking
Rotation mode 2 and gentle turning mode 3 or braking turning mode 2
And the reverse rotation mode 4 can be easily switched.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram, FIG. 2 is a perspective view, FIG. 3 is a hydraulic circuit diagram, FIG. 4 is a power transmission diagram, FIG. 5 is a cross-sectional view, and FIG. Slow turning according to the present invention [FIG. 8] Slow turning according to the present invention [Description of reference characters] A section 1 Traveling device 2 Brake turning mode 2L Left brake 2R Right brake 3 Slow turning mode 3a Slow turning clutch 4 Reverse turning mode 4a Reverse clutch 5 Setting means 6 Turning direction selection lever 6a Display means 7 Switching means 8L Left switching clutch 8R Right switching clutch 9 Input shaft 10 Fixed type hydraulic motor 11 Traveling transmission device 12 Speed increasing clutch 12a Clutch case 12b Piston 12c Piston 13 Low speed output gear 14 High speed Output gear 15 Gear 15a Gear 16 Gear 17 Counter shaft 18 Gear 19 Gear 19a Gear 20 Intermediate shaft 21 Secondary speed shifter 22 Gear 2 Gear 24 Gear 25 Side clutch shaft 26L Left clutch 26R Right clutch 27 Casing 28 Counter collar 29L Gear 29R Gear 30 Piston 31 Hydraulic chamber 31a Spring 32 Transmission case 33a Disk 33b Disk 34 Connection plate 35 Pressure plate 35a Pressure plate 36 Oil passage 37 Oil Path 38 Oil path 39 Hydraulic chamber 40 Piston 41 Pressure plate 41a Pressure plate 42a Disk 42b Disk 43 Shaft 44L Gear 44R Gear 45L Gear 45R Gear 47L Gear 47R Gear 48L Shaft 48R Shaft 49L Gear 49R Gear 50L Travel shaft 50R Travel shaft 51L Gear 51R Gear 52L Sprocket 52R Sprocket 53 Shaft 54 Gear 55 Gear 56 Gear 57 Gear 58 Tilt angle 59 Tilt angle 60L Proportional pressure reducing valve 60R Proportional pressure reducing valve 61 Tilt angle 61a Tilt angle 100 Control means (CPU)

Claims (1)

(57) Claims 1. A braking turning mode 2 in which a selected one of a pair of left and right traveling devices 1 is braked, and a gentle turning mode 3 in which the selected one is decelerated. A reverse rotation mode 4 for driving one of the selected vehicles to rotate in the reverse direction, and further comprising a turning direction selection lever 6 for selecting a left or right turning direction of the traveling device 1. A control means 100 for executing the braking turning mode 2, the gentle turning mode 3, and the reverse turning mode 4 in conjunction with an arbitrary turning side is provided, and a running shift for arbitrarily shifting and transmitting power to the running device 1. The device 11 is provided with setting means 5 for previously setting the transmission system to the gentle turning mode 3 and the reverse turning mode 4, and in conjunction with the setting position of the setting means 5, the set slow turning mode 3 is set. Or execute the reverse rotation mode 4 The switch means 7, work vehicle steering operating device, characterized in that provided in the turning direction selector lever 6.