JPH06115456A - Traveling power transmission device for combine and the like - Google Patents

Abstract

PURPOSE:To simplify constitution by unifying a steering brake into an unit in a traveling power transmission for a combine, etc. CONSTITUTION:A differential means 3 is interposed between differential axes 2L and 2R which are threadedly meshed with paired right and left steering clutches 1L and 1R, and a traveling power transmission device for a combine and the like comprises a disc brake 5 provided for the differential case 4 of the differential means 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a traveling power transmission device such as a combine, and can be used for a tractor having a steering clutch type power transmission device and other mobile agricultural machines.

[0002]

2. Description of the Related Art In a steering transmission device in which the steering clutch is disengaged to enable the steering brake, steering brakes are provided outside the left and right steering clutches. However, the steering brakes for the respective steering clutches are individually braked to perform steering or turning, or the left and right steering brakes are simultaneously braked to form a parking brake. In such a form, the steering brake has a pair of left and right configurations, is complicated, and is heavy.

[0003]

According to the present invention, a diff device 3 is provided between diff shafts 2L and 2R meshing with a pair of left and right steering clutches 1L and 1R, and a disc brake 5 is mounted on a diff case 4 of the diff device 3. The traveling transmission device such as a combine is provided.

[0004]

Operation and Effect of the Invention Steering clutch 1L or 1R
Is in a normal occlusion state and is transmitted straight to the left and right traveling devices. When steering to either the left or the right, for example, when steering or turning to the left, the left steering clutch 1L is disengaged to cut off the transmission to the left traveling device to perform left steering. Since the differential case 4 is braked by further applying the disc brake 5, the left differential shafts 2L and 2R are rotated in the opposite directions with respect to the left differential shaft 2R. Accordingly, the left traveling device is reversed.
Therefore, the aircraft turns left. Further, it is transmitted by the same action in the right steering or turning traveling.

Since the disc brake 5 is provided in the differential case 4 as described above, it is commonly used as the steering brake for both the left and right steering clutches 1L, 1R, and thus may have a single structure. The overall structure of the steering transmission can be simplified, and the size and weight can be reduced. Further, it is possible to improve the operability by reducing the difference between the left and right of the braking force, the amount of brake operation, etc.

[0006]

[Example] A traveling transmission device of a combine is illustrated. The combine is mounted on a chassis 7 having a pair of left and right traveling devices 6 in the form of crawler, a threshing device 8, a Glen tank, and a control device 9.
And the like, and a harvesting frame 14 having a grain culm raising device 10, a collecting device 11, a cutting blade device 12, a grain culm transporting device 13, and the like, a support shaft 1 above a transmission case 15 in front of the threshing device 8.
The lift cylinder 17 is provided so as to be vertically rotatable about 6 and is lifted and lowered by expanding and contracting the lift cylinder 17 by hydraulic pressure between the mowing frame 14 and the chassis 7. It is possible to transfer and supply the grain culms to be harvested by the harvesting device configured as described above to the feed chain 18 of the rear threshing device 8 for threshing.

The traveling transmission case 15 has a hydraulic continuously variable transmission HST on one side of the upper portion thereof, and is transmitted from the drive shaft 19 of the engine to the input shaft 20. This hydraulic continuously variable transmission HS
The T can be steplessly changed from the neutral position to the forward-side high-speed position or the reverse-side high-speed position by operating the speed change lever 21 of the control device 9. The output shaft of the hydraulic continuously variable transmission HST is connected to the speed change shaft 22 of the traveling power transmission case 15, and meshed with the gear 27 of the steering clutch shaft 26 via the auxiliary speed change gear 23 and the counter shaft 25 of the counter gear 24. To do.
The clutch body 28 at the center of the steering clutch shaft 26 is provided with the clutch pawls 29 of the pair of left and right steering clutch gears 1L and 1R so as to engage with each other by the tension of the springs 30L and 30R. By operating the clutch gears 1L and 1R to the left and right outside by operating the clutch shifter against the springs 30L and 30R, the clutch pawls 29L and 2R are moved.
The 9R portion is separated from the clutch body 28, and the clutch shaft 2
Transmission from 6 to each steering clutch gear 1L, 1R can be cut off.

Each steering clutch gear 1L, 1R has a counter gear 32L, 3 rotatable about a counter shaft 31.
2R is always meshed, and these counter gears 32L, 32
The sprocket shafts 34L and 34R of the left and right crawler traveling devices 6 are transmitted from the wheel gears 33L and 33R meshing with the R. In such a traveling transmission device, the left and right steering clutch gears 1L and 1R are constantly meshed with the gears 35L and 35R, and the differential shaft 2L integrated with the gear 35L and the gear 3 are provided.
A differential (differential) device 3 is formed between the 5R and the integral differential shaft 2R. A disc brake 5 along the rotational direction is provided on the outer periphery of the differential case 4 bearing the differential shafts 2L and 2R,
The disc brake 5 is clamped from both left and right sides by brake shoes 37 by brake cylinders 36 to brake the rotation of the differential case 4. Reference numeral 38 denotes a brake unit having the brake cylinder 36, the brake shoe 37, etc., 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 left traveling device 6 can be steered to the left. When the disc brake 5 is braked in this state, the rotation of the differential case 4 is stopped according to this braking force, and the differential device 3 is rotated against the rotation of the differential shaft 2R driven from the steering clutch gear 1R through the gear 35R. The left side differential shaft 2L is transmitted in the reverse rotation by the action of
L, the steering clutch gear 1L, etc., and the traveling device 6 on the left side
Can be rotated in the opposite direction to the right side and make a sharp turn to the left side.

Regarding 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, and 4L and 44R, respectively.
5 is a brake cylinder for braking the disc brake 5, 46 is an electromagnetic proportional solenoid valve, and 47 is a power steering valve operated manually. The electromagnetic proportional solenoid valve 46 is appropriately controlled to operate at an aperture degree, a speed, etc. by an output from the controller CPU based on detection of various conditions by the sensor.

While the cutting sensor 43 detects the harvested grain culm, the steering control valve 42 is switched and the steering clutch cylinder 44L or 44R is operated to change the harvesting direction to the grain culm. Drive along. At this time, the power steering valve 47 and the electromagnetic proportional solenoid valve 46 are kept open. Here, at the time of steering turning, the power steering valve 47 or the electromagnetic proportional solenoid valve 46 is operated in the closing direction, so that the steering clutch cylinder 44
The oil overflowed from L or 44R is sent to the brake cylinder 45 to operate the brake shooter 37 to pinch the disc brake 5 for braking. As a result, the rotation of the differential case 4 is braked, and the differential shafts 2L and 2R are differentially operated.

In the electromagnetic proportional solenoid valve 46, the initial set pressure is changed by the change of the 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 operation 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, the turning radius under each condition can be made almost the same, and the condition changes. Can be restored.

[Brief description of 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 steering lever and the disc brake control pressure in the controller.

FIG. 6 is a side view of the combine.

[Explanation of symbols]

 1 Steering clutch 2 Differential shaft 3 Differential device 4 Differential case 5 Disc brake

Claims (1)

[Claims] 1. A transmission for traveling such as a combine in which a differential device 3 is provided between differential shafts 2L, 2R meshing with a pair of left and right steering clutches 1L, 1R, and a disc brake 5 is provided in a differential case 4 of the differential device 3. apparatus.