JPH0549329A - Running-linking gear of working car - Google Patents

Abstract

PURPOSE:To improve the work efficiency by dissolving inconveniences, e.g. a long waiting time for lowering of the cutter unit in next forward movement for working, due to an immoderate elevation of the cutter unit beyond the required amount by an automatic elevation mechanism actuated in a backing operation of a combine. CONSTITUTION:This working car is equipped with a linking gear (A) connecting an electromagnetic valve 11 of the cutter unit 1-elevating cylinder 5 and a volume 10 of the variable speed gearing 7 to a controller 12 and capable of elevating the cutter unit 1 following backing operation of a variable speed lever 7 of HST 8 so that the amount of elevation may be small or large corresponding to the slowness or the rapidness of the backing speed produced by swinging operation of the variable speed lever 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a traveling linkage device for a front-mounted work vehicle such as a combine or a front mower lawn mower having a working device in front of its body.

[0002]

2. Description of the Related Art In a front-mounted work vehicle, various malfunctions are caused by forgetting to move a work device in a low working traveling state and moving backward (for example, in a combine: The reaping part is damaged by collision with the ground ,: Hooks the culm at the cutting part and pulls it out from the root ,: The culm is clogged in the reaping part ,: It becomes impossible to run due to a wet field with a large resistance)
There was a machine equipped with a mechanism that automatically raises the work device as the machine body moves backward.

[0003]

The automatic lifting mechanism is
The work device is raised to a predetermined height position (for example, the upper limit) in conjunction with the reverse operation. In this mechanism, the phenomenon of forward lowering of the machine body becomes noticeable when moving backward rapidly, so it is convenient to raise the front-mounted working device largely. However, when moving backward at a low speed, the work device is raised more than necessary, and a waiting time for lowering the work device when moving to the next forward traveling is required, which is not preferable in terms of work efficiency. There was room for An object of the present invention is to improve so that an automatic raising operation can be performed in a front-mounted work vehicle without lowering work efficiency.

[0004]

In order to achieve the above-mentioned object, the present invention provides a pre-mounted work vehicle, which is provided with a working device at the front position of the traveling machine body so as to be able to move up and down, and works in association with the backward operation of the traveling machine body. Along with moving the device up and down, the up and down mechanism that drives and lowers the work device to a state in which the up movement amount is small when the reverse speed expressed by the reverse operation is slow and increases when the reverse speed is high, It is characterized in that it is provided with a linking means for linking a gear shift operation tool to the device.

[0005]

According to the above characteristic structure, the automatic raising amount of the working device associated with the backward operation is increased or decreased according to the magnitude of the set reverse speed. It is unnecessary to set a minimum amount of rise so that a small amount of rise is revealed when moving backward at a low speed, that is, to prevent the inconveniences described above and the like from occurring. It is possible to execute a desirable state for efficiency without lowering waiting time or loss of power by raising the vehicle regardless of the reverse speed.

[0006]

Therefore, by providing a device for controlling the amount of increase due to the operation of the automatic raising mechanism to a value commensurate with the reverse speed that appears, it is possible to provide a traveling linkage device that improves the reduction in work efficiency.

[0007]

Embodiments of the present invention will be described below with reference to the drawings in the case of a combine, which is an example of a front-mounted work vehicle. The front part of the combine is shown in FIG. 2, 1 is a mowing part which can be freely moved up and down by a hydraulic cylinder 5, 2 is a threshing part, 3
Is a crawler traveling device, 4 is a control unit, and 6 is a mowing device in the mowing unit 1. In this combine, the transmission M section is provided with a hydrostatic continuously variable transmission (hereinafter abbreviated as HST) 8, and the continuously variable transmission is performed by the operation of the HST 8 by the manual operation of the shift lever 7 provided in the control section 4. It is designed to allow free forward running, neutral where the running stops, and reverse running where stepless shifting is possible. Then, as shown in FIG. 1, the mowing unit 1 (corresponding to the working device) is moved upward with the reverse operation of the shift lever 7, and the amount of the upward movement is the swing amount of the shift lever 7, that is, the reverse operation. The lifting mechanism 9 for driving and raising the reaper 1 and the linking means A for linking the speed change lever 7 are provided in a state in which the backward movement speed that is expressed by the slow speed is low and the backward speed is high. . The speed change lever 7 operates the volume 10, and the volume 10 and the electromagnetic control valve 11 of the hydraulic cylinder 5 are connected to a control device 12 using a microcomputer, and the reaping clutch lever 13 is operated to enter. A reaping switch 14 is provided which is activated when it is connected to the control device 12. In addition, a potentiometer for detecting the stroke of the piston 5a of the hydraulic cylinder 5 to obtain the height of the mowing unit 1 with respect to the machine body [a sensor (an optical sensor, an ultrasonic sensor, or the like for detecting the ground height of the mowing unit 1)] May be directly arranged.] 16, which is also connected to the control device 12. Reference numeral 15 is an elevating lever for elevating and lowering the mowing section 1 by a manual operation, and during the operation of the linking means A, the control of the control valve 11 by the operation has priority over the operation by the elevating lever 15. There is. The lifting mechanism 9 includes a control valve 11 and a hydraulic cylinder 5. Next, the operation of the linking means A will be described. When the reaping clutch lever 13 is turned on and the reaper 1 is at a low position suitable for reaping work, the speed change lever 7 is operated to the reverse R side. Then, the reaping switch 14 and the linear potentiometer 1
The control device 12 operates the control valve 11 by the function of 6 and drives the hydraulic cylinder 5 so that the reaper 1 is raised, and the control device 11 controls the control valve 11 according to the swing angle of the speed change lever 7 by the volume 10. The energizing time is adjusted to set the rising amount of the mowing unit 1. The linking means A does not operate when the reaper 1 is sufficiently raised.

As shown in FIG. 3, a vertical frame 20 that connects the reaping drive case 17 and the drive portion 19 of the raising device 18 and a horizontal frame 22 that connects the reaping drive case 17 and the divider 21 are extendable and retractable. It has a divided structure, and the front-rear distance L between the mowing drive case 17 and the divider 21.
Is adjustable. It is convenient if the support member 23 connecting the lower part of the raising device 18 and the lateral frame 22 is also expandable. In addition, as shown in FIG. 4 and FIG.
The cutting blade crank portion of the cutting device 6 has a structure in which a shaft 26 welded to the tip of the reciprocating swing arm 24 is fitted with a bearing 26, and the bearing 26 is directly fitted into a receiving portion 27a of the cutting blade 27. .

[Other Embodiments] The linkage means A may be operated independently of the reaping clutch lever 13, and a time means such as a timer may be connected to the control device 12 to operate the speed change lever 7 to the reverse R side. The linking means A may be configured to control so that the raising amount of the reaper 1 is increased as the length of time for continuing the operation is longer. Further, it is more convenient to perform the control in which the raising / lowering control by the operation time of the shift lever 7 and the raising / lowering control by the operation amount to the reverse side are combined.

It should be noted that reference numerals are added to the claims for convenience of comparison with the drawings, but the present invention is not limited to the structures of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is a control system diagram showing the structure of linking means.

FIG. 2 is a side view of the front part of the combine.

[Fig. 3] Side view of the reaper

FIG. 4 is a plan view showing a main part of the reaping device.

FIG. 5 is a sectional view showing a transmission structure of a cutting blade crank.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Working device 3 Traveling device 7 Speed change operation tool 9 Elevating mechanism A Linking means

Claims (1)

[Claims] 1. A working device (1) is provided at a front position of a traveling machine body so as to be able to move up and down, and the working device (1) is moved upward in accordance with a backward operation of the traveling machine body, and the ascending movement amount is set to the above-mentioned value. An elevating mechanism (9) for driving and elevating the working device (1) and a gear change with respect to the traveling device (3) in a state where the reverse speed that appears by the reverse operation is low and the reverse speed is high. A traveling link device for a work vehicle, comprising a link means (A) for linking the operating tool (7).