JPS6228804Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention provides a steering control system for a reaping harvester such as a combine harvester, which is configured so that the clutch action and braking action of a steering clutch brake can be performed continuously by a single fluid pressure cylinder. Regarding equipment.

The steering device of this type of conventional reaping and harvesting machine was configured to operate the fluid pressure cylinder at a constant speed from the clutch action area to the brake action area. If the clutch action is set to a high value so that it is sensitive, the steering clutch can be quickly engaged and engaged when steering is controlled using only the clutch action of the steering clutch brake, such as during automatic reaping and harvesting work. While this operation allows the aircraft to better follow along the planted grain culm, it is also possible to control steering by using the braking action of the steering clutch brake, such as when turning the aircraft at the end of the field. In such cases, the brakes are applied suddenly, which can cause the aircraft to rotate excessively, which is dangerous. There was a problem in that laborious operations were required to be performed intermittently, resulting in a significant increase in work fatigue. Furthermore, in order to smoothly perform steering control using the brake action as described above, if the operating speed of the fluid pressure cylinder is set to a low value, the steering control is performed using only the clutch action of the steering clutch brake. In this case, the steering clutch was slow to engage and close, resulting in a disadvantage that the aircraft's ability to follow the planted stems and culms deteriorated.

In view of the above-mentioned circumstances, an object of the present invention is to make it possible to perform overall sensitive and highly safe steering control by rationally improving the operating speed of the hydraulic cylinder. In the above-mentioned device, there is provided a device for detecting that the amount of operation of the fluid pressure cylinder has shifted from a clutch action area to a brake action area, and a control signal to the fluid pressure cylinder based on the detection by this detection device. The present invention is characterized by being provided with an operation speed reduction means for throttling the fluid supply circuit.

As a result, when steering is controlled using only the clutch action of the steering clutch brake, such as during automatic reaping and harvesting work, the steering clutch can be quickly engaged and disconnected to control the aircraft. It is possible to sensitively follow the grain culm rows, and when controlling the steering using the braking action of the steering clutch brake, such as when turning the aircraft at the end of the field, the brake Since the brake can be applied while adjusting the degree of braking, that is, in a half-brake state, it is possible to perform smooth and safe steering control without overturning, and it also allows the operator to avoid unnecessary braking. Since no operation is required, work fatigue can also be reduced.

Hereinafter, an embodiment of the present invention will be described based on the drawings.The clutch action and braking action of the left and right steering clutch brakes 3, 3 provided in the transmission case 2, which controls the drive of the pair of left and right crawler type traveling devices 1, 1. are constructed so as to be able to be performed sequentially and continuously by single hydraulic cylinders 4, 4 provided on the transmission case 2 side, respectively, and a pulling device is provided diagonally at appropriate intervals in the left and right lateral directions. Introducing the planted grain culms to the grass dividers 6, 6, which constitute the route A on the side closest to the uncut land, among the grass dividers 6, which constitute the route A..., into this route A. Steering control sensors 7, 7 are provided for detecting lateral displacement of the aircraft relative to the planted grain culms.

In addition, the hydraulic cylinders 4, 4 and the hydraulic pump P
Hydraulic cylinder 4 on the uncut land side is installed on the oil path between
A solenoid valve 8 is installed which can be freely switched between a first state in which pressure oil is supplied to the hydraulic cylinder 4 on the mowed land side, a second state in which pressure oil is supplied to the hydraulic cylinder 4 on the mowed field side, and a neutral state in which the pressure oil is returned to the tank T. At the same time, both the sensors 7, 7
The hydraulic cylinders 4, 4 are steered based on the detection result of the clutch action area a of the clutch brakes 3, 3.
a steering control circuit 9 that outputs a signal to the electromagnetic valve 8 to automatically operate the hydraulic cylinders 4, 4 in the clutch action area a and the brake action area b of the steering clutch brakes 3, 3; A manual switch 10 is provided that outputs a signal for actuation to the solenoid valve 8, so that the state in which the aircraft is automatically steered and controlled based on the detection results of the sensors 7, 7, and the manual switch 10 is provided. The configuration is such that the aircraft can be manually steered and controlled. The steering control circuit 9 controls the electromagnetic valve 8 based on the detection results of the sensors 7, 7 for the time required for the hydraulic cylinders 4, 4 to disengage the clutches of the steering clutch brakes 3, 3. The manual switch 10 outputs a continuous signal while being operated.

And, between the hydraulic cylinders 4, 4 and the electromagnetic valve 8, check valves 11, 11 and mechanical variable throttle valves 12, 12 as operating speed reduction means are interposed. A first oil passage 13A. , 13A, and the throttle valve 14,
14 are provided so that the pressure oil normally flows through the first oil passages 13A, 13A, and the piston rods 4A, 4 of the hydraulic cylinders 4, 4A, the hydraulic cylinders 4, 4 move from the clutch action area a to the brake action area b of the steering clutch brakes 3, 3.
cams 15, 15 are provided as a device for detecting this transition, which actuate the variable throttle valves 12, 12 in the direction of cutting off the first oil passages 13A, 13A, and in the hydraulic cylinders 4, 4. , internally includes springs 16, 16 that bias the piston rods 4A, 4A in the contraction direction, so that the operating speed V ₂ of the hydraulic cylinders 4, 4 in the brake action area b is changed from that in the clutch action area a. The hydraulic cylinder ₄ ,
The return speed V ₃ of the clutch is configured to be greater than the operating speed V ₁ in the clutch action area a.

In the figure, reference numeral 17 is a relief valve, which sets the braking force at the relief pressure when the aircraft comes to a complete stop, and is used with the relief applied when the aircraft turns.

Further, the hydraulic cylinders 4, 4 are configured to have a slight margin in their strokes so that the strokes are extended due to wear of the brakes.

Note that although reference numerals are written in the claims section of the utility model registration for convenience of comparison with the drawings, the present invention is not limited to the structure of the attached drawings by such entry.

[Brief explanation of the drawing]

The drawings show an embodiment of the steering device in the reaping harvester according to the present invention, Fig. 1 is a schematic plan view of the combine, Fig. 2 is a hydraulic circuit diagram of the main parts, and Fig. 3 is the operating speed relationship of the hydraulic cylinders. This is a diagram showing. 3...Steering clutch brake, 4...Driving device, 15...Detecting device, 12...Operation speed reduction means.

Claims (1)

[Scope of utility model registration request] In a steering device for a reaping harvester configured so that the clutch action and braking action of the steering clutch brake 3 can be performed continuously by a single fluid pressure cylinder 4, the amount of operation of the fluid pressure cylinder 4 corresponds to the clutch action. It is characterized in that it is provided with a device 15 that detects the transition from area a to brake action area b, and an operating speed reduction means 12 that throttles the fluid supply circuit to the fluid pressure cylinder 4 based on the detection by this detection device. A steering device for a reaping and harvesting machine.