JP3498714B2 - Combine traveling transmission - Google Patents

Description

BACKGROUND OF THE INVENTION [Field of the Invention [0001] The present invention, Ru der those <br/> about the traveling transmission apparatus Konbai down. 2. Description of the Related Art An example of a conventional traveling power transmission for a mobile agricultural machine is as follows.
For example, as described in JP-A-4-103472
Then, the belt transmission is shifted according to the operation amount of the steering lever.
The belt gearbox is operated to rotate the differential case.
There is a configuration in which the rotation speed is changed and the vehicle turns differentially. [0003] The above described Japanese Patent Application Laid-Open No. 4-103472 discloses
The traveling transmission of the mounted mobile agricultural machine has a steering sensor 4
3 Detect the cut stalks and follow the stalks
Does not have a function for automatic steering. [0004] The present invention solves the above-mentioned problems.
To this end, the following technical measures were taken. That is, hydraulic stepless
The output shaft of the transmission is connected to the transmission shaft 22 of the traveling transmission case 15.
And the transmission shaft 22 is extended so that the transmission shaft 22
A power take-out portion A is formed, and the power take-out portion A is
A counter shaft 25 is provided.
Between the auxiliary transmission gear 23 and the counter gear 24
A sub-transmission is constituted, and power after shifting by the sub-transmission is
Gear 27 on the left and right side of the steering clutch shaft 26
To the center of the steering clutch shaft 26.
A pair of left and right steering clutch gears 1
The L, 1R clutch claws 29L, 29R are
L, 30R provided so as to engage with each other with a tension force,
Operating the clutch shifters 1L and 1R
Moves left and right outwards against the springs 30L and 30R
By doing so, the clutch claws 29L and 29R are closed.
From the steering clutch shaft 26 separately from the switch body 28.
The transmission to the positive clutch gears 1L and 1R can be cut off.
The steering clutch gears 1L, 1R are
The counter gears 32L and 32R are always meshed with each other, and the counter
Wheel gears 33L, 33R meshing with gears 32L, 32R
Sprocket shaft 3 of crawler traveling device 6,6 on the left and right
Running of a combine configured to transmit 4L and 34R
In the power transmission, a pair of left and right steering clutch gears 1 is provided.
Left and right gears 35L, 35R always mesh with L, 1R,
The left differential shaft 2L integral with the left gear 35L and the right gear
The differential device 3 is configured between the 35R and the integral right differential shaft 2R.
Differential casing for bearing the left and right differential shafts 2L, 2R.
A disk brake 5 is provided on the outer periphery of the
Brake shoe with brake cylinder 45 for rake 5
The differential case 4
Of the brake cylinder 4
Unit 3 having brake shoe 5 and brake shoe 37
A case for opening and closing the opening 39 of the traveling transmission case 15
Provided also as a cover, and cut by the steering sensor 43
The steering control valve 42 is switched and controlled while detecting the culm streak.
The left steering clutch cylinder 44L or the right steering clutch cylinder.
The cylinder 44R is operated to move along the stalk.
When turning the power steering valve 47 on,
On the other hand, when turning by manual operation, the power steering valve 47 is closed.
Operating in the same direction as the left steering clutch cylinder
From the left 44L or right steering clutch cylinder 44R.
Buffing oil is sent to the brake cylinder 45.
To activate the disc brake 5
The pinch is braked to control the rotation of the differential case 4.
To perform differential operation between left differential shaft 2L and right differential shaft 2R.
Converter which was characterized by being configured so as to be pivoted
The drive transmission of the Inn . According to the present invention , when turning by manual operation,
By operating the power steering valve 47 in the closing direction.
The left steering clutch cylinder 44L or the right steering clutch
Oil that overflows from the
To the brake cylinder 45 to operate the brake shoe 37
And press the disc brake 5 to apply braking.
The rotation of the differential case 4 is braked so that the left differential shaft 2L and the right differential shaft
It is possible to make a turn by performing a differential with the shaft 2R. Further , when the power steering valve 47 is opened,
While detecting the harvested culm streak by the steering sensor 43.
Switch control of the steering control valve 42 from the left steering clutch
Make Linda 44L or right steering clutch cylinder 44R.
It can move and run along the stalks. DESCRIPTION OF THE PREFERRED EMBODIMENTS A traveling transmission for a combine is exemplified. The combine is equipped with a threshing device 8, a Glen tank, a steering device 9, and the like on a chassis 7 having a pair of left and right crawler-type traveling devices 6, and includes a grain stalk raising device 10, a collecting device 11, a cutting blade device 12, And a harvesting frame 14 having a grain culm transport device 13 and the like is provided so as to be vertically rotatable about a support shaft 16 above a transmission case 15 in front of the threshing device 8, and this raising and lowering is performed by hydraulic pressure between the cutting frame 14 and the chassis 7. This is performed by expansion and contraction of the lift cylinder 17. The grain stalks cut by the cutting device configured as described above can be transferred and supplied to the feed chain 18 of the rear threshing device 8 for threshing. [0008] The traveling transmission case 15 has a hydraulic continuously variable transmission HST on one upper side, and transmits power from a drive shaft 19 of the engine to the input shaft 20. This hydraulic continuously variable transmission HS
T can continuously change the speed from the neutral position to the forward high-speed position or the reverse high-speed position by operating the shift lever 21 of the control device 9. The hydraulic output shaft of the continuously variable transmission HST connected to transmission shaft 22 of the traveling transmission case 15 constitutes a power-up output to unit A at the shaft end by extending this axis 22. Further, a counter shaft 25 is provided in parallel with the shaft 22, and a sub-transmission gear 23 is provided between the shaft 22 and the counter shaft 25.
A subtransmission is configured with the counter gear 24 interposed, and the power after the shift is transmitted to the gear 27. The clutch body 28 at the center of the steering clutch shaft 26 is provided with clutch claws 29 of a pair of left and right steering clutch gears 1L, 1R so as to engage with the tension of springs 30L, 30R. The steering clutch gears 1L, 1R are moved to the left and right outer sides by operating a clutch shifter.
Movement of the clutch claw 29
By disengaging the L and 29R portions from the clutch body 28, transmission from the clutch shaft 26 to the steering clutch gears 1L and 1R can be cut off. Each of the steering clutch gears 1L, 1R has counter gears 32L, 3 rotatable with respect to the counter shaft 31.
2R are always meshed, and these counter gears 32L, 32
The sprocket shafts 34L, 34R of the left and right crawler traveling devices 6 are transmitted from the wheel gears 33L, 33R meshed with R. In such a traveling transmission, the left and right steering clutch gears 1L, 1R always mesh with the gears 35L, 35R, and the differential shaft 2L integrated with the gear 35L, and the gear 3L.
A differential (differential) device 3 is configured between the 5R and the integral differential shaft 2R. A disk brake 5 is provided on the outer periphery of a differential case 4 bearing the differential shafts 2L and 2R along the rotation direction.
The rotation of the differential case 4 is braked by squeezing the disc brake 5 from both left and right sides with a brake shoe 37 by a brake cylinder 45 . Reference numeral 38 denotes a brake unit having the brake cylinder 36, the brake shoe 37, and the like, which also serves as a case cover for opening and closing the opening 39 of the traveling transmission case 15. When the steering clutch 29L is disengaged, the transmission from the clutch body 28 to the left steering clutch 29L is cut off, so that the transmission can be steered to the left by the transmission of the left traveling device 6. When the disc brake 5 is braked in this state, the rotation of the differential case 4 is stopped in accordance with the braking force, and the rotation of the differential shaft 2R driven from the steering clutch gear 1R through the gear 35R causes the differential device 3 to rotate. The reverse rotation of the left differential shaft 2L is transmitted by the action of
L, via the steering clutch gear 1L, etc.,
Can be transmitted and rotated in the direction opposite to the right side, and can turn sharply to the left side. In the hydraulic circuit 40 for operating the steering clutch and the disc brake, P is a hydraulic pump, T is a tank port, 41 is a lily valve, 42 is a steering control valve,
43 is a steering sensor; 44L and 44R are steering clutch cylinders for shifting the steering clutch gears 1L and 1R;
Reference numeral 5 denotes a brake cylinder that brakes the disc brake 5, 46 denotes an electromagnetic proportional solenoid valve, and 47 denotes a power steering valve that is manually operated. The operation of the electromagnetic proportional solenoid valve 46 is appropriately controlled to a degree of aperture, a speed, and the like by an output from the controller CPU based on detection of various conditions by sensors. While the cutting sensor 43 detects the cutting grain culm, the cutting direction is controlled by switching the steering control valve 42 to control the steering clutch cylinder 44L or 44R.
Is operated to run along the stalks. At this time, the power steering valve 47 and the electromagnetic proportional solenoid valve 46
Is in an open state. Here, at the time of the steering turn, the oil that overflows from the steering clutch cylinder 44L or 44R is sent to the brake cylinder 45 by operating the power steering valve 47 or the electromagnetic proportional solenoid valve 46 in the closing direction, and the brake cylinder 45 is operated. Shooter 3
7 is actuated to clamp the disc brake 5 for braking. Thus, the rotation of the differential case 4 is braked, and the differential between the differential shafts 2L and 2R is performed. In the solenoid proportional solenoid valve 46, an initial set pressure is changed by a change in current under the condition detected by each sensor (FIG. 4). When the power steering lever is manually operated, the output pressure of the power steering valve 47 is controlled for each set initial pressure (FIG. 5). Therefore, even if the operating angle of the power steering lever is the same, the control pressure of the disc brake can be arbitrarily selected by the current value of the proportional solenoid, and the turning radius under each condition can be made substantially the same. Can also be restored.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front view of a transmission mechanism of a traveling transmission unit. FIG. 2 is a side view thereof. FIG. 3 is a hydraulic circuit diagram of a steering clutch and a brake. FIG. 4 is a graph showing a relationship between current and initial pressure of an electromagnetic proportional solenoid valve. FIG. 5 is a graph showing the relationship between the operation angle of the power telescopic lever and the disc brake control pressure in the controller. FIG. 6 is a side view of the combine. DESCRIPTION OF SYMBOLS 1L steering clutch gear 1R steering clutch gear 2L differential shaft 2R differential shaft 3 differential device 4 differential case 5 disk brake 6 crawler traveling device 15 traveling transmission case 22 transmission shaft 23 auxiliary transmission gear 24 counter gear 25 counter shaft 26 steering clutch shaft 27 gear 28 clutch member 29L clutch pawls 29R clutch pawls 30L spring 30R spring 32L counter gear 32R counter gear 33L Hoirugiya 33R Hoirugiya 34L sprocket shaft 34R sprocket shaft 35L gear 35R gear 37 brake shoe 38 brake unit 39 opening 42 steering control valve 43 steering sensor 44L steering clutch cylinder 44R steering clutch cylinder 45 brake cylinder 47 power steering valve A power take-out part

Claims (1)

(57) [Claim 1] A traveling transmission cable is connected to an output shaft of a hydraulic continuously variable transmission.
And the transmission shaft 22 is extended.
A power take-out portion A is formed at the shaft end of the speed change shaft 22,
A counter shaft 25 is provided in parallel with the transmission shaft 22, and the transmission shaft
Between the auxiliary transmission gear 23 and the counter shaft 25
A sub-transmission is constituted by interposing the sub-transmission
The power after shifting by the device is transmitted to the left and right on the steering clutch shaft 26.
The gear is arranged to transmit to the gear 27 at a position closer to one side, and the steering
A pair of right and left clutch bodies 28 is provided at the center of the clutch shaft 26.
Steering clutch gears 1L, 1R clutch claws 29L, 2
So that the 9R part engages with the tension of the springs 30L, 30R
The pair of left and right steering clutch gears 1L, 1R are
By operating the latch shifter, the springs 30L, 30
The clutch pawl 29
The L and 29R sections are separated from the clutch body 28 and the steering
Transmission from the switch shaft 26 to each of the steering clutch gears 1L, 1R
Can be disengaged, each of the steering clutches
The counter gears 32L, 32R always mesh with the gears 1L, 1R.
Wheel that meshes with the counter gears 32L, 32R
Left and right crawler traveling devices 6, 6 from gears 33L, 33R
To transmit the sprocket shafts 34L and 34R
The left and right pair of controls
Left and right gears 35L, 35R on the directional clutch gears 1L, 1R
And a left differential shaft integrated with the left gear 35L.
2L and the right differential shaft 2R integral with the right gear 35R.
A differential device 3 is formed on the left and right differential shafts 2L and 2R.
A disk brake 5 is provided around the outer periphery of the differential case 4 for bearing.
And the disc brake 5 is moved by the brake cylinder 45.
By pressing the brake shoe 37 from both left and right sides
Therefore, the rotation of the differential case 4 is braked.
A brake having a rake cylinder 45 and a brake shoe 37
The rake unit 38 is connected to the opening 39 of the traveling transmission case 15.
The steering sensor is also provided as a case cover that opens and closes
The steering control valve 4 while detecting the cut culm streak by the -43
2 is switched and the left steering clutch cylinder 44L or
Actuates the right steering clutch cylinder 44R to produce the corn stem.
Open the power steering valve 47 when running along
Power steering when turning by manual operation.
Actuating the valve 47 in the closing direction causes the steering to the left.
Clutch cylinder 44L or right steering clutch cylinder
Oil that overflows from the 44R
And sends it to the
The brakes are clamped by the brakes 5 to provide braking.
The rotation of the gear 4 is braked to rotate the left differential shaft 2L and the right differential shaft 2R.
Combine traveling transmission apparatus characterized by being configured so as to be pivoted to perform the differential between.