JPH06219342A - Running posture control device for combine - Google Patents

Abstract

PURPOSE:To facilitate running and turning at a wet rice.field by a method wherein right and left crawlers are moved frontward based on a car body through steering turning operation. CONSTITUTION:When the pressure of a relief valve 27 is increased through operation of a power steering lever 24, rolling cylinders 7 and 7 are expanded by right and left rolling control valves 30 by means of an output from a controller and operated to the car body lifting side. The operation causes rise of the angles of parallel rings 5 and 6 and raising of a car body 2 from a crawler 1. In this case, the right and left rolling cylinders 7 and 7 are simultaneously operated in the same direction and raised in a state that the car body 2 is kept in a parallel posture. When the power steering lever 24 is returned from a slewing operation position, an operation brake is disengaged, the right and left rolling control valve 30 are switched to a neutral position, and the car body 2 is kept in a raising posture. In linkage with raising of the car body 2, the crawler 1 is moved forward. Thus, the ground touch length of the crawler 1 is unchanged and the center of gravity position of a whole car body is moved forward based on the crawler 1. Thus, the center of gravity of the crawler is situated in a front position during mowing running and in a rear position during turning.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combine running posture control device for facilitating turning by moving left and right crawlers forward with respect to a vehicle body during steering turning.

[0002]

2. Description of the Related Art In a combine having a crawler type traveling device, if the ground contact length of the crawler is lengthened, straightness and wetland traveling are good, but resistance is large and difficult during turning. . In addition, if the ground contact length of the crawler is made short, the swirling property is good, but the swiveling property is not easy because the sinker sinks in a wetland.

The present invention facilitates traveling or turning in a wet field not only during mowing work but also during steering turning.

[0004]

The present invention provides a traveling posture control device for a combine, which supports the left and right crawlers 1 so as to move forward with respect to the vehicle body 2 by a steering turning operation.

[0005]

During the harvesting work by combine traveling, the crawlers 1 on the left and right with respect to the vehicle body 2 have moved to the rear position and are in a relationship close to the center of gravity of the combine. When turning by the steering operation, the left and right crawlers 1 are moved to the front side due to the steering operation. As a result, the crawler 1 supports the front part of the vehicle body 2, and the center of gravity moves rearward as compared with the mowing traveling. Therefore, the reaping device side of the front portion is easily floated by the driving reaction force and the like, and the turning traveling is smoothly performed.

[0006]

1 to 5, a combine is a vehicle body 2
Has a vehicle body frame 3 in the lower part of the frame 3, and a crawler frame 4 is movably supported by a pair of front and rear parallel links 5 on both left and right sides of the frame 3, of which the front left and right parallel links 5 are A rolling cylinder 7 is provided between the vehicle body frame 3 and the vehicle body 3 by hydraulic pressure, and the left and right crawler frames 4 can be moved up and down by the expansion and contraction control of the rolling cylinder 7. The front and rear parallel links 5 and 6 are connected by a rod 8 so that they can be raised and lowered while maintaining a parallel state. Each crawler frame 4 has a rolling wheel 9 and an end rolling wheel 10 at the rear end arranged therein, and the crawler 1 can be stretched over the crawler frame 4.

The traveling transmission case 11 is attached to the front part of the vehicle body 2, and swinging cases 12 which can swing back and forth are provided on the left and right sides of the vehicle body 2, and the crawler frame 4 is rotatable around a sprocket shaft 13 of the swinging case 12. The front ends of are connected. Therefore, when the crawler frame 4 is rocked back and forth, the swing case 12 at the front end is rocked back and forth.

The traveling transmission case 11 includes a transmission 14,
It has a steering clutch 15, a steering brake 16, a traveling shaft 17, etc., and the vehicle body 2 supports an axle housing portion 18 of the traveling shaft 17. Further, the swing case 12 is rotatable around an axle housing portion 18, gear-interlocks with the sprocket shaft 13, and a front end portion of the crawler 1 is wound around a sprocket 19 fixed to an end portion of the sprocket shaft 13. It is a structure that can be hung and driven.

At the front part of the vehicle body 2, the rear end of the feed conveyor 21 of the reaping device 20 is supported, a cabin 23 having a cockpit and the like is provided on one side of the car body 2, and a threshing device 22 is mounted at the rear part thereof. The grain culm to be mowed at 20 is supplied to the threshing device 22 to thresh. By tilting the power steering lever 24 provided in the cabin 23 to the left or right, the steering control valve 25 is switched to operate the steering clutch cylinder 26 so that the steering clutch 15 can be turned on and off. By increasing the inclination angle of 24,
By changing the pressure of the brake relief valve 27, the operation stroke of the clutch cylinder 26 can be kept large, and the steering brake 16 can be applied around the steering side crawler 1 to perform the turning. The hydraulic circuit 28 includes a hydraulic pump P, an unload valve 29, a rolling control valve 30 that controls the left and right rolling cylinders, and the like. T is a tank port.

When the power steering lever 24 is operated to increase the pressure of the relief valve 27, the left and right rolling control valves 30 are actuated to the vehicle body raising side by the output from the controller, and the parallel links 5 and 6 are operated. The vehicle body 2 is raised with respect to the crawler 1 by raising the angle. Since the left and right rolling cylinders 7 are simultaneously actuated in the same direction, the vehicle body 2 is lifted up in a parallel posture in both left and right and front and rear directions. When the power steering lever 24 is returned from the turning operation position, the steering brake 16 is released, the left and right rolling control valves 30 are both switched to the neutral position, and the vehicle body 2 is raised. At this time, when it is desired to lower the vehicle body 2, the left and right rolling control valves 30 may be switched to the lower side by operating the elevating operation lever or the like. Further, when the power steering lever 24 is returned from the steering turning position to the straight traveling posture, the left and right rolling control valves 30 may be switched to the lowered position in conjunction with this.

In this way, by expanding and contracting the left and right rolling cylinders 7, the parallel links 5 and 6 are rotated to move the vehicle body 2 up and down with respect to the crawler 1, but when the vehicle body 2 is raised, the crawler 1 is moved. It is moved to the front side and returned to the rear side when descending. Therefore, the ground contact length of the crawler 1 does not change, but the center of gravity of the entire vehicle body moves forward and backward with respect to the crawler 1, and is in the front position during mowing traveling and in the rear position during turning.

When the center of gravity moves back and forth as described above, the turning center also moves back and forth. In FIG. 5, the center position of the crawler 1 is C, and the center of gravity of the machine body is G when moving forward.
1 position and G2 position when moving backward, forward direction F
The turning center positions D1 and D2 when turning right at
They are turning diameters having a radius R, which are on the almost right lateral line of the respective center-of-gravity positions G1 and G2. Therefore, it is easy to turn on a headland or the like.

Further, when controlling the left and right inclination or the horizontal posture of the vehicle body 2, the left and right rolling control valves 30 can be output manually or by horizontal sensor detection to perform rolling control. At this time, the front and rear positions of the left and right crawlers 1 change. Therefore, the back-and-forth movement of the left and right crawlers 1 by the operation of the power steering lever 24 as described above is selectively set by the controller so that the control mode can be switched so as to be performed at the time of steering turning.

In FIG. 6, the difference from the above example is that the sprocket 19 of each of the left and right crawlers 1 is driven by an independently driven hydraulic motor M. This hydraulic motor M
Is attached to the crawler frame 4 of each crawler 1,
The left and right hydraulic motors M are connected by hydraulic hoses so as to drive the left and right hydraulic motors M by a hydraulic pump mounted on the vehicle body 2 side.

[Brief description of drawings]

FIG. 1 is a side view of a combine.

FIG. 2 is a front view of the traveling transmission device.

FIG. 3 is a plan view of a crawler.

FIG. 4 is a steering and rolling control hydraulic circuit diagram.

FIG. 5 is a plan view showing the turning action of the crawler.

FIG. 6 is a side view of a crawler portion showing another embodiment.

[Explanation of symbols]

 1 crawler 2 vehicle body 5 parallel link 6 parallel link 7 rolling cylinder 24 power steering lever 27 power steering relief valve 30 rolling control valve

Claims (1)

[Claims] 1. A traveling posture control device for a combine, comprising left and right crawlers 1 supported to move forward with respect to a vehicle body 2 by a steering turning operation.