JP3452035B2 - Transmission mechanism of traveling device in combine - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention, in combine
It relates to the transmission mechanism of the traveling device . 2. Description of the Related Art Japanese Patent Laid-Open Publication No. Hei.
Power transmission from the engine via the left and right side clutches.
The left and right axles reached in the power transmission mechanism
A differential mechanism capable of differentially rotating the output shaft is provided;
The left and right output shafts of the left and right side clutches
When either is cut, the output shaft on the cut side is
Rotate via differential mechanism
Transmits the rotation from the side clutch to move the left and right axles.
A mechanism for rotating is described. Power source
, The hydraulic transmission for traveling that changes the speed continuously.
Transmission to the left and right side clutches via the
Was. Also, as described in JP-A-4-103472.
The axle drive mechanism is configured as a side clutch
And a differential mechanism is provided outside the transmission case,
Adjust the speed of the rotation of the mechanism case with a belt transmission.
With this, the axle on the side where the side clutch is disconnected is shifted and driven.
2. Description of the Related Art There is known a technique for making a turn. [0003] The above-mentioned Japanese Patent Application Laid-Open No. Hei.
No. 76 discloses that by simply reversing the left and right axles,
It only performed spin turns in degrees. The present invention
By devising the differential mechanism, the axle on the outside of turning is turned to the axle on the inside of turning.
It rotates twice as fast as possible to enable double-speed turns.
You. Differential rotation of left and right output shafts at double speed
There is a method that can be easily performed by rotating the differential mechanism.
You. . In addition, the rotation from the power source
Transmission to the left and right side clutches via the hydraulic transmission for
Forward and backward at a constant speed
In some cases, the power is supplied via the hydraulic transmission for traveling.
Communication was taking place. For this reason, hydraulic transmissions for traveling
Requires a lot of horsepower to drive the
When a load is applied to the axle, the load
Power loss to drive the transmission
To reduce the number of revolutions of the power source
was there. Further, a technique disclosed in Japanese Patent Application Laid-Open No. 4-103472 is disclosed.
With a relatively expensive belt transmission and a belt
Stop rotation drive of differential mechanism case by default transmission
The clutch and the
There is a disadvantage that can not be provided at low cost down. Also the bell
Transmissions are inferior to hydraulic transmissions in terms of transmission torque
Large load when the combine turns in the wetland
If this occurs, a slip will occur between the belt and split pulley.
Rotation of the differential mechanism case cannot be controlled,
There is a drawback that it becomes a state of noh. And maneuver
By changing the amount of operation of
Because of the continuous transition, security issues remain. [0004] Accordingly, the present invention provides a power supply
A hydraulic stepless variable drive for continuously changing the rotation from the source
Left and right side clutches
And the left and right axles 37, 37 'are differentially rotated.
And a differential mechanism 50 that can be installed in the transmission case 1 respectively.
The left and right side clutches 33 and 33 '
The axle with the side clutch disengaged on one side
A transmission mechanism for transmitting the operating power from the driving mechanism 50;
The moving mechanism 50 includes a differential case 51 of the differential mechanism 50 itself.
Continuously variable by hydraulic turning continuously variable transmission 61 provided separately
The gear is rotated to the floor, and the left and right axles are
37, 37 'in the upper transmission path,
Main shift lever for shifting the running hydraulic transmission 16
66, a lock-up switch 70 is provided.
When the switch 70 is operated, the hydraulic shift for traveling is performed.
The rotation from the power source is performed without the
Drive to the clutches 33 and 33 '
Set the speed, and when the speed falls below the set traveling speed
Automatically open the throttle to drive at the set speed.
On the other hand, while the lock-up switch 7
0 is not operated and the maximum output of the power source or
If the set traveling speed continues for the set time,
A power source without dynamically interposing the hydraulic transmission 16 for traveling.
From the gear to the left and right side clutches 33 and 33 '.
And the main shift lever 66
Switch 68 is provided.
To make the outer axle 37 turn faster than the inner axle 37 '.
That it can be turned by rotating
This is a transmission mechanism of the traveling device in the combine . An embodiment of the present invention will be described with reference to the drawings.
Reference numeral 1 denotes a transmission case of a traveling device of a working machine such as a combine, in which an input shaft 2 is provided horizontally at an upper position, and an input pulley 3 to which rotation from an engine is transmitted is provided on the input shaft 2. The input shaft 2 has a large gear 4 and a small gear 5
And the speed increasing clutch 6 is provided between the large gear 4 and the small gear 5 and the input shaft 2. The speed increasing clutch 6 is the input shaft 2
And a partition member 9 that rotates integrally with the rotary drum 8 is provided in a central portion of the rotary drum 8, and cylinder chambers 10 and 11 are formed on both left and right sides of the partition member 9, respectively. In the chambers 10 and 11, a piston 12,
The clutch disk 13 provided on the inner periphery of the rotary drum 8 and the clutch disks provided on the large gear 4 and the small gear 5 are brought into contact with and separated from each other. A connecting rod 14 connects the piston 12 and the piston 13. Thus, a traveling hydraulic continuously variable transmission (hydrostatic transmission) 16 constituting the main transmission is provided on the side of the transmission case 1. The hydraulic continuously variable transmission 16 has a transmission shaft 15 serving as an input shaft of the HST pump 17 mounted on the transmission case 1, and an input gear 18 constantly meshed with the large gear 4 is fixed to the transmission shaft 15. Reference numeral 19 denotes an HST motor of the hydraulic continuously variable transmission 16;
It is connected to the ST pump 17 by an oil passage 20. The hydraulic continuously variable transmission 16 operates the HST pump 17 by the rotation of the transmission shaft 15, and the HST pump 17 transmits oil to the HST motor 19 while continuously increasing or decreasing the amount of oil supply. Reference numeral 23 denotes a main transmission on / off clutch provided between the HST motor 19 and the output transmission shaft 22;
Is a transmission gear that constantly meshes with the small gear 5, and 25 is a transmission drive gear. Reference numeral 26 denotes an auxiliary transmission shaft, on which an integrally formed small gear 27 and a large gear 28 are attached so as to be slidable only, and the small gear 27 and the transmission drive gear 25 or the large gear 28 One meshing with the transmission gear 24 is selected. 2
9 is a driving gear fixed to the auxiliary transmission shaft 26, 30 is a passive gear fixed to the side clutch shaft 31, and the driving gear 29
Is always engaged. Left and right internal teeth (not shown) are formed on both left and right sides of the passive gear 30, and side clutch gears 32 and 32 are formed on the side clutch shaft 31 with claw portions (not shown) that can be freely connected to and detached from the left and right internal teeth. Slidably attached to the left and right side clutches 33, 3 by means of the left and right internal teeth of the passive gear 30 and the claws of the side clutch gears 32, 32 '.
Form 3 '. 34, 34 'are shifters, 35, 3
5 'is a cylinder, 36 and 36' are cylinders 35 and 3.
5 'solenoid, 37, 37' is axle, 38, 38 '
Is a gear that always meshes with the side clutch gears 32 and 32 '. In the vicinity of the side clutch shaft 31,
Left and right divided left and right output shafts 45 and 45 'are respectively mounted on the shaft, a left gear 46 is fixed to the left output shaft 45, a right gear 46' is fixed to the right output shaft 45 ', and the left gear 46 is The right gear 46 'always meshes with the gear 48 which rotates integrally with the side clutch gear 32, and the right gear 46'
And always mesh with the gear 48 'which rotates integrally. The output shafts 45, 45 'between the left gear 46 and the right gear 46' are provided with a differential mechanism 50 for changing the rotational speed of the output shafts 45, 45 '. The differential mechanism 50 includes a case 51 rotatably provided in the transmission case 1, and the front ends of the output shafts 45 and 45 ′ are faced in the case 51.
Left and right bevel gears 52, 52 'are provided at the end of 5' so as to face each other, and intermediate bevel gears rotatably mounted on shafts 53, 53 'fixed to the case 51 respectively on the left and right bevel gears 52, 52'. 54, 54 ′ are engaged with each other, and a passive gear 55 is provided on the outer periphery of the case 51.
And a fixed drive transmission gear 57 is always meshed. The differential mechanism 50 is configured such that 2Z = X + Y where X is the left output shaft 45, Y is the right output shaft 45 ', and Z is the case 51. That is, when the case 51 stops with respect to the left output shaft 45 and the right output shaft 45 ′, Z becomes 0, and 0 = X + Y, and therefore,
X = −Y, X and Y are reversed, and the rotation of Y is Y = 2Z−X.
Is set to 150, Y becomes 200, and Y is rotated twice as fast as X (the relationship between X and Y can be reversed). Therefore,
A turning (power steering) hydraulic continuously variable transmission 61 that is operated by tilting a power steering lever 60 is provided on a side portion of the transmission case 1, and the control shaft 56 is rotated and stopped by the turning hydraulic continuously variable transmission 61. The configuration is as follows. The hydraulic stepless transmission 61 for turning is an HST pump 6
2 and an HST motor 63, the output transmission shaft 22 being an input shaft of the HST pump 62, and a control shaft 56
Is the output shaft from the HST motor 63, between the output transmission shaft 22 and the HST pump 62 and the control shaft 56.
And the HST motor 63 are provided with power steering clutches 64 and 65, respectively. Therefore, when the rotation of the case 51 is stopped by the hydraulic stepless transmission 61 for turning, the differential mechanism 50 can perform a so-called spin turn for reversing the left and right axles 37 and 37 ′, and rotate the case 51 for turning. When a predetermined rotation is performed by the hydraulic continuously variable transmission 61, a double speed turn can be performed by driving and rotating the axle on the outer side of the turn faster than the axle on the inner side of the turn. FIG. 5 shows a hydraulic circuit. A differential switch 68 for operating the differential mechanism 50 is provided on a main transmission lever 66 operated by the hydraulic stepless transmission 16, and the differential switch 68 is controlled by a relay 69. The solenoids 36, 36 '
Is reversed (FIG. 6). In other words, the right side clutch 33 'is normally disengaged by the solenoid 36' during a right turn, but the left side clutch 33 is disengaged by the solenoid 36 and the right axle 37 'on the inside of the turn is rotated at a constant speed in a double speed turn. Then, the left axle 37 on the outer side of the turn is driven and rotated faster than the right axle 37 'on the inner side of the turn, so that the operations of the solenoids 36 and 36' are reversed. Also, 70
Is a lock-up switch. When the lock-up switch 70 is operated, the main transmission on / off clutch 23 is disengaged,
Increase the rotation of the input shaft 2 by increasing the speed of the clutch 6 → small gear 5 → transmission gear 24 → output transmission shaft 22 → transmission drive gear 25 → small gear 27
→ the sub-transmission shaft 26 → the drive gear 29 and the rotation is directly transmitted without passing through the hydraulic continuously variable transmission 16. FIG. 7 shows an embodiment relating to an operation mechanism of the power steering lever 60, in which the power steering lever 60 is connected to the hydraulic continuously variable transmission 61 for turning, and as shown in FIG. The left and right side clutches 33, 3
Turning 3 'off, turning forward from this state causes double-speed turning, and turning backward causes a spin turn (the combination of tilting direction and turning direction is arbitrary). Reference numeral 72 denotes left and right crawlers of the traveling device. Also, the hydraulic stepless transmission 61 for turning is operated by operating the differential switch 68 and turning on and off the side clutches 33 and 33 'so as to operate when operated to perform a double speed turn. When configured, the hydraulic stepless transmission 61 for turning
To avoid the loss of horsepower for operating the. FIG.
A brake mechanism 73 for stopping the case 51 of the differential mechanism 50 and a rotation mechanism 77 for rotating the case 51 with respect to the left and right output shafts 45 and 45 ′ are provided.
A brake case 74 is provided on one end side of the motor 6, and discs are provided on the brake case 74 and the control shaft 56 so as to come in contact with and separate from each other. It always meshes with a transmission gear 76 provided via a double-speed turn clutch 75 provided on the shaft 26, and with respect to the rotation speed of the side clutch shaft 31 transmitted by the drive gear 29 and the passive gear 30 of the auxiliary transmission shaft 26. The differential mechanism 50 rotates rapidly by the engagement of the transmission gear 76, the drive transmission gear 57, and the passive gear 55 to form the rotation mechanism 77. Therefore, the differential mechanism 50
When the rotation of the case 51 is stopped by the brake mechanism 73, a so-called spin turn for rotating the left and right axles 37 and 37 'in a reverse direction can be performed. ′ Can be driven and rotated faster than the axle 37 inside the turn to perform a double-speed turn. FIG. 11 shows a hydraulic circuit diagram of the second embodiment. Reference numeral 78 denotes an emergency stop switch provided on the main speed change lever 66, which operates the brake case 74 by disengaging the left and right side clutches 33, 33 '. When the lock-up switch 70 is operated, the lock-up switch 70 not only locks up, but also sets a traveling speed. When the traveling speed is lower than the set traveling speed, the throttle is automatically opened to set the traveling speed at the set traveling speed. In the automatic running speed control, if the maximum output state of the engine or the set running speed continues for a set time, the vehicle may be automatically locked up at the vehicle speed at that time. 79 is a throttle sensor, 80 is an engine speed sensor, 8
1 is a speed sensor (FIG. 12). FIG.
Reference numeral 82 denotes a hydraulic pressure adjusting valve which sets the initial hydraulic pressure of the hydraulic circuit. When the initial hydraulic pressure is set high by the hydraulic adjusting valve 82, the operation of each cylinder and the like can be accelerated. And although illustration is omitted, the traveling device is provided with a rolling mechanism that makes the expectation horizontal with respect to the inclination of the field, and a left and right horizontal sensor 83 that detects the hydraulic pressure of the rolling cylinder that operates the mechanism is provided. When the weight is heavy, the pressure is increased by the hydraulic adjustment valve 82, and when the weight is light, the pressure is decreased. Numeral 84 denotes a grain stalk sensor which senses the presence or absence of work of the cutting section, and reduces the hydraulic pressure to zero by the hydraulic pressure adjusting valve 82 during the work to prevent the spin turn. Reference numeral 85 denotes an inclination sensor which does not perform a spin turn when the body is inclined by a predetermined angle or more. 86
Is a body sinking sensor. When the body sinks, the turning torque increases, and the pressure is increased by the hydraulic adjustment valve 82. Reference numeral 87 denotes a front-rear balance sensor which increases the pressure when the front side is heavy because it is difficult to turn, and lowers the pressure when the rear side is heavy. Reference numeral 88 denotes a left / right balance sensor for increasing the pressure of the hydraulic adjustment valve 82 when the heavier one of the left and right sides of the fuselage is on the outside of the turn. Next, the operation will be described. The rotation from the engine is transmitted to the input pulley 3, and the rotation of the input shaft 2 rotated by the input pulley 3 is transmitted to the large gear 4 via the speed increasing clutch 6, and the large gear 4 is always engaged with the input gear 18. , The input gear 18 rotates the transmission shaft 15, and the transmission shaft 15 operates the HST pump 17 of the hydraulic continuously variable transmission 16 to feed oil to the HST motor 19 to transmit the rotation,
The rotation of the HST motor 19 is changed to the main speed on / off clutch 23 →
The power is transmitted to the side clutch shaft 31 via the output transmission shaft 22 → the transmission drive gear 25 → the small gear 27 → the subtransmission shaft 26 → the drive gear 29 → the passive gear 30. In normal traveling, the left and right side clutches 33, 33 'are engaged, and the rotation of the side clutch shaft 31 is transmitted to the side clutch gears 32, 32', and the side clutch gears 32, 32 'are always meshed with the gear 38, 38 ', and the gears 38, 38' transmit rotation to the axles 37, 37 'to drive the traveling device,
Let it run. And the left and right side clutches 33, 33 '
When one of them is turned off, the turning is performed with the turned off side as the turning inside. The left and right side clutches 33, 3
When one of the 3 ', for example, the right side clutch 33' is turned off, the side clutch gear 32 'is in a free state,
Right output shaft 4 provided with right gear 46 'meshing with gear 48'
5 ′ is also free with respect to the case 51 of the differential mechanism 50. When the hydraulic hydraulic continuously variable transmission 61 is operated for double-speed turning, the power steering clutch 64 and the power steering clutch 65 are turned on correspondingly, and the control shaft 56 is turned on.
Is transmitted to the case 51 of the differential mechanism 50 via the drive transmission gear 57 and the passive gear 55 to be rotated. The differential mechanism 50 is configured such that the left output shaft 45 is X, and the right output shaft 45 ′
Is Y and the case 51 is Z, 2Z = X + Y
For example, if X is 100 and Z is 150, Y is 200, and Y is rotated twice as fast as X. In this way, by changing the rotation of the case 51 through the turning hydraulic continuously variable transmission 61 in a stepless manner by the tilting operation of the power steering lever 60, the axle on the turning outside is driven faster than the axle on the turning inside. You can make a double speed turn. That is, when turning left, the right crawler is on the outside of the turn, and the corresponding right side clutch 33 'is disengaged, and the side clutch gear 32', gear 48 ', right gear 46', and right output shaft 45 '. Are set in a free state with respect to the case 51, the case 51
Of the right output shaft 45 ′ (Y side) by the rotation of the left output shaft 45.
It can rotate faster than (X side) and make double speed turn. When the case 51 is stopped with respect to the left output shaft 45 and the right output shaft 45 'by the turning hydraulic continuously variable transmission 61, Z becomes 0, and 0 = X + Y. −Y, and X and Y are reversed. Therefore, when one of the left and right side clutches 33, 33 ′, for example, the right side clutch 33 ′ is disengaged, the corresponding right output shaft 45 ′ moves relative to the case 51. Becomes free, the rotation of the left output shaft 45 is transmitted to the right output shaft 45 ′ as reverse rotation by the differential mechanism 50, and the rotation of the right output shaft 45 ′ is rotated by the right gear 46 ′, the gear 48 ′ and the side clutch. Gear 3
2 'and the gear 38', so that the left axle 37 and the right axle 37 'rotate in opposite directions to each other, so that a so-called spin turn can be performed. Since the turning hydraulic continuously variable transmission 61 can operate the rotation stop and the speed change of the control shaft 56 by the power steering lever 60, as described above, the left and right turning, the double speed turn, and the spin turn are performed by one. Can be performed by the power steering lever 60. When one of the left and right side clutches 33, 33 'is disengaged during normal traveling, the vehicle turns by the driving force on the other Y side. At this time, the rotation of the crawler on the X side returns to the opposite direction. 2Z = X + Y becomes Z ≠ 0 due to the rotation and the constant-speed driving Y and the X rotating due to the contact resistance, which acts to rotate the case 51 of the differential mechanism 50.
At this time, if the HST motor 63 is turned off, the case 51 rotates freely. In this case, if Z = Y / 2,
Since X = 0, the left clutch 33 is disengaged as described above, and the case 51 is moved to Y by the hydraulic stepless transmission 61 for turning.
When it rotates with respect to, it turns while the X side is completely stopped. Further, the hydraulic stepless transmission 61 for turning is used.
Is activated when one of the left and right side clutches 33, 33 'is turned on and off, thereby preventing output loss of the engine and improving durability. In the second embodiment, the transmission gear 76 provided on the auxiliary transmission shaft 26 and the drive transmission gear 5 meshing with the transmission gear 76 are used instead of the hydraulic stepless transmission 61 for turning.
7 and the speed increase ratio of the passive gear 55 meshing with the drive transmission gear 57, the case 51 rotates faster than the left and right output shafts 45 and 45 'corresponding to X and Y, and can make a double speed turn. In addition, the rotation of the control shaft 56 is stopped by the brake mechanism 73, so that the rotation of the case 51 is stopped, and the left output shaft 45 and the right output shaft 45 'are rotated in reverse to perform a spin turn. According to the present invention, the rotation from the power source is continuously variable.
The rotation from the traveling hydraulic continuously variable transmission 16
Left and right side clutches 33, 33 'to be disengaged and left and right axles
A differential mechanism 50 capable of differentially rotating 37, 37 'is
Left and right side clutches
Disengage the side clutch on one of the left and right sides of 33, 33 '
Operating power from the differential mechanism 50 to the axle on the other side.
The differential mechanism 50 is configured to transmit the differential
Zero differential case 51 itself is provided separately for hydraulic turning
So that it can be rotated with a stepless speed change by the step transmission 61.
And the transmission on the upper side of the left and right axles 37, 37 '.
Provided in the path, and the traveling hydraulic transmission 16
Lock-up switch on main shift lever 66 for shifting operation
70 and operate the lock-up switch 70
Power without passing through the traveling hydraulic transmission 16
Rotation from the source to the left and right side clutches 33, 33 '
In addition to enabling transmission, set the running speed and set the running
When the speed drops below the line speed, the throttle is automatically
Open to run at the set travel speed, while
The state where the lock-up switch 70 is not operated
When the maximum output state of the power source or the set traveling speed is set
If it continues for a while, it will automatically change the hydraulic
The rotation from the power source is transmitted to the left and right
To be able to be transmitted to the id clutches 33 and 33 '.
In addition, a differential switch 68 is provided on the main shift lever 66,
By operating the differential switch 68, the axle 37 on the outside of the turn is turned.
Is turned faster than the inner axle 37 '
Characterized in that it is configured to perform
The transmission mechanism of the traveling device in
The left and right axles 37, 37 'are reversed by the moving mechanism 50.
Not only can you make a spin turn, but also
The axle to be driven faster than the inner axle
Make double speed turns and improve turning performance
become.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic longitudinal sectional view of a transmission case in an unfolded state. FIG. 2 is a side view of the same. FIG. 3 is a sectional view of a speed increasing clutch. FIG. 4 is a schematic diagram of an operation mechanism. FIG. 5 is a hydraulic circuit diagram. FIG. 6 is a circuit diagram. FIG. 7 is a perspective view. FIG. 8 is a configuration diagram of a power steering lever. FIG. 9 is an operation state diagram. FIG. 10 is a view of a second embodiment. FIG. 11 is a hydraulic circuit diagram of the second embodiment. FIG. 12 is a block diagram of the second embodiment. [Explanation of Signs] 1 ... mission case, 2 ... input shaft, 3 ... input pulley, 4 ... large gear, 5 ... small gear, 6 ... speed increasing clutch, 8 ...
Rotating drum, 9: partition member, 10, 11: cylinder chamber,
12, 13 ... piston, 14 ... connecting rod, 15 ... transmission shaft, 16 ... hydraulic continuously variable transmission, 17 ... HST pump,
18 ... input gear, 19 ... HST motor, 20 ... oil passage, 2
2 output transmission shaft, 23 main transmission on / off clutch, 24 transmission gear, 25 transmission transmission gear, 26 auxiliary transmission shaft, 27
Small gear, 28 large gear, 29 driving gear, 30 passive gear, 31 side clutch shaft, 32, 32 'side clutch gear, 33, 33' left and right side clutch, 3
4, 34 '... shifter, 35, 35' ... cylinder, 3
6, 36 ': solenoid, 37, 37': axle, 38,
38 '... gear, 45, 45' ... output shaft, 46, 46 '...
Gears, 48, 48 ': gears, 50: differential mechanism, 51: case, 52, 52': left and right bevel gears, 53, 53 ': shaft,
54, 54 '... intermediate bevel gear, 55 ... passive gear, 56 ... control shaft, 57 ... drive transmission gear, 58 ... clutch for double speed turn, 60 ... power steering lever, 61 ... hydraulic hydraulic continuously variable transmission, 62 ... HST pump, 63 ... HST motor, 6
4: clutch for power steering, 65: clutch for power steering,
68 differential switch, 69 relay, 70 lock-up switch, 71 groove, 72 crawler, 73 brake mechanism, 74 brake case, 76 transmission gear, 7
7: rotation mechanism, 78: emergency stop switch, 79: throttle sensor, 80: engine speed detection sensor, 8
1: speed sensor, 82: hydraulic adjustment valve, 83:
Left and right horizontal sensor, 84 ... grain culm sensor, 85 ... inclination sensor, 86 ... body sinking sensor, 87 ... front and rear balance sensor, 88 ... left and right balance sensor.

Claims (1)

(57) [Claims 1] A run in which rotation from a power source is continuously variable.
Turns on / off the rotation from the hydraulic stepless transmission 16 for row
Left and right side clutches 33, 33 ', and left and right axles 37,
A differential mechanism 50 capable of differentially rotating 37 '
The left and right side clutches 33 are provided in the case 1 respectively.
33 'of the side with the side clutch disengaged on one side
The operating power from the differential mechanism 50 is transmitted to the axle.
The differential mechanism 50 has a
Hydraulic continuously variable transmission for turning with separate case 51 itself
If the gear is rotated in a stepless manner by the device 61,
Both are in the transmission path on the upper side of the left and right axles 37, 37 '.
And the traveling hydraulic transmission 16 is operated for gear shifting.
Lock-up switch 70 to main shift lever 66
When the lock-up switch 70 is operated,
Without passing through the traveling hydraulic transmission 16,
Rotation can be transmitted to the left and right side clutches 33, 33 '
And set the running speed, and
When the speed decreases, open the throttle automatically
It is configured to travel at the set traveling speed, while
When the backup switch 70 is not operated, the power source
If the maximum output state or the set traveling speed continues for the set time,
The hydraulic transmission 16 for traveling automatically at the vehicle speed at that time
The rotation from the power source without passing through
H, 33 'and 33'.
A differential switch 68 is provided on the speed lever 66, and the differential switch 68 is provided.
The axle 37 on the outside of the turn is operated by the operation of the
You can rotate and drive faster than axle 37 '
Driving in a combine, characterized in that
The transmission mechanism of the device.