JPS6233990B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a first state in which only the front wheel of the front and rear wheels is steered by changing the direction thereof, and a second state in which the direction of both the front and rear wheels is changed in the steering operation tool.
The present invention relates to a steering device for a mobile agricultural machine that is provided with a mechanism that disconnects and disconnects the steering operation tool from the rear wheels in order to switch between the two states, and the purpose of the steering device is to enable appropriate switching of the connection and disconnection mechanism. It is something.

Conventionally, in configuring an intermittent mechanism that disconnects and disconnects the steering operation tool from the rear wheels, it has been proposed that
As shown in the technique disclosed in Japanese Patent No. 140547, a clutch is provided in which a connecting shaft connecting a front wheel steering mechanism and a rear wheel steering mechanism is divided into two parts, and a spline is formed on the inner surface of the connecting shaft that is divided into two parts. It was constructed with a sleeve as a body.

However, with this type of clutch structure using splines, the clutch body can be engaged at any phase with the fixed spline on the case side that fixes the rear wheel steering mechanism, so the split connection is not possible. In order to connect the shafts at a specific phase, that is, at a specific phase where both the front and rear wheels are in a completely straight-line steering state, there is a problem in that a display device is required, as shown in the technique disclosed in this publication. Ta.

The present invention achieves the following by devising the intermittent mechanism.
The purpose of the present invention is to enable a front wheel steering link mechanism and a rear wheel steering link mechanism to be connected only in a specific phase, such as when the front and rear wheels are in a completely straight-ahead steering condition, without providing a display device. .

The characteristic structure of the present invention for achieving the above object is as follows:
The disconnection mechanism includes a rear wheel operating swing link for the rear wheel steering link mechanism fixed to one end side of a connecting shaft connecting the front wheel steering link mechanism and the rear wheel steering link mechanism. , a front wheel operating swing link for a front wheel steering link mechanism that is integrated with a swing link connected to a steering operating tool is provided on the other end side of the connecting shaft, and the rear wheel operating swing link In the connecting shaft portion between the front wheel operating swing link and the front wheel operating swing link, there are notches formed in the case fixing frame on the rear wheel operating swing link side and spaced at appropriate intervals in the circumferential direction, and a front wheel operating swing link. A clutch body having protrusions spaced at appropriate intervals in the circumferential direction that selectively engage with recesses formed at appropriate intervals in the circumferential direction formed in the end face of the boss portion is provided so as to be slidably fitted on the outside; The arrangement positions of each recess and each protrusion in the circumferential direction are set so that adjacent ones are spaced apart from each other with an angular range larger than the swing angle range of the front wheel operating swing link. , the one recess formed in the case fixing frame is configured to engage the front wheel operating swing link only within the swing range of the front wheel operating swing link and only when the front and rear wheels are in a straight-ahead steering state. Provided in a position where it can engage with the clutch body,
The present invention is constructed as an intermittent mechanism by the engagement of only one protrusion and a recess within the range of steering operation by the steering operation tool, and this configuration provides the following functions and effects.

In other words, in configuring the disconnection mechanism that disconnects and disconnects the front wheel steering link mechanism and the rear wheel steering link mechanism, only one protrusion and recess engage with each other within the steering operation range of the steering operation tool. Because it has a clutch structure,
The phase of the recess on the fixed side of the case is set so that it can engage with the front wheel operating swing link via the protrusion of the clutch body only when both the front and rear wheels are operated in a completely straight-line steering state. As long as the front wheel steering link mechanism and the rear wheel steering link mechanism are connected only in a specific phase when the front and rear wheels are in a completely straight-line steering state, it is possible to connect the front wheel steering link mechanism and the rear wheel steering link mechanism without installing a display device. By simplifying the device, we developed an intermittent mechanism that connects the front and rear wheels only at a specific phase, how to provide the interlocking member in the intermittent mechanism part, and the swing angle range of the swing link for steering operation. The structure can be easily constructed by simply devising the method of setting.

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 shows a side view of a combine harvester as an example of a mobile agricultural machine, in which a machine frame 3 is supported by a pair of left and right propulsion front wheels 1, 1 that can be driven and rotated, and a pair of left and right rear wheels 2, 2 that can freely rotate. The front of this machine is equipped with a threshing device 5 that handles grain culms while being held and conveyed by a feed chain 4 built on one side of the machine, a driver's seat 6, an engine 7 for driving various devices, etc. In the section, there is a device 8 for raising grain culms planted in the field into an upright position, a reaping device 9 for cutting the base of the raised grain culms, and a rear section for conveying the harvested grain culms to the rear and supplying them to the threshing device 5. A reaping processing section including a conveyance device 10 and the like is connected and equipped so as to be movable up and down around the horizontal axis P.

The system is configured to automatically and continuously perform operations such as raising and reaping the occlusions planted in the field and handling and processing the reaped grain culms as the system progresses.

Next, the steering device will be explained.

The left and right front wheels 1, 1 and the left and right rear wheels 2, 2 are configured to be operable to change direction using steering link mechanisms 11 and 12 as direction change operation mechanisms, respectively. A wheel-type steering handle 1 as a steering operation tool is provided in front of the driver's seat 6.
3 is provided, and this handle 13 is linked with the front wheel steering link mechanism 11 and the rear wheel steering link mechanism 12, and the handle 13 is used to connect the front wheel of the front and rear wheels 1, 1, 2, 2. The steering wheel 13 and the rear wheels 2, 2 is provided.

The linkage structure between the handle 13 and both steering link mechanisms 11 and 12 is such that the handle 1
Steering gear box 33 provided at the base of 3
A pitman arm 15 that is pivotally supported by and can be operated to swing back and forth, and a swing link 16 that can swing around the vertical axis X are interlocked and connected by a rod 17, and are integrally formed with the swing link 16. The front wheel operating swing link 18 and the front wheel steering link mechanism 11 are interlocked and connected by a rod 19, and are swingable around the vertical axis X and rotatable integrally with the swing link 18. The rear wheel operating swing link 20 linked to the rear wheel steering link mechanism 12 is interlocked with the rear wheel steering link mechanism 12 by a rod 21.

The connection/disconnection mechanism 14 is connected to the swing link 16
and the rear wheel operating swing link 20, and the steering handle 13 and the rear wheels 2, 2 are connected to each other. , in order to connect the front wheel steering link mechanism 11 and the rear wheel steering link mechanism 12, an upper end portion of a rotating shaft 22 as a connecting shaft is rotatably supported with its axis aligned with the vertical axis X. The rear wheel operating swing link 20 is fixed to the rotating shaft 22, and the swing link 16, which is integral with the front wheel operating swing link 18, is rotatably supported at the lower end of the rotating shaft 22. A clutch body 24 is spline-coupled to the shaft 22 and has protrusions 23b that can be engaged with recesses 23a cut out in the end face of the boss portion of the swing link 16 by sliding in the direction of the axis X. ing. Further, the angle at which the swing link 16 swings to change the direction is set to be smaller than 120 degrees,
The recesses 23a are spaced 3 times at intervals of 120 degrees in the circumferential direction.
The projections 23b are formed individually, and the projections 23b are arranged in the circumferential direction.
They are formed at 120 degree intervals, which results in
Only when the front and rear wheels 1, 1, 2, 2 are running straight, the projections 23b can be engaged with the recesses 23a, that is, the connection/disconnection mechanism 14 can be connected.

Also, when the clutch body 24 is operated to move away from the swing link 16,
A recess 26 formed with a notch in the fixed frame 25 that also serves as a case.
A... is provided with a protrusion 26b... that can be engaged with, and with this structure, the front and rear wheels 1, 1, 2,
2 is operated in the direction corresponding to straight travel, the clutch body 24 is disengaged from the swing link 16 and continues to engage the fixed frame 25, so that when the connection/disconnection mechanism 14 is in the disconnected state,
A mechanism 27 is configured to fix the rear wheels 2, 2 in an orientation corresponding to straight forward travel.

Reference numeral 28 denotes a longitudinal swinging lever that is connected to the shift fork 29 of the clutch body 24 via a link mechanism 30 to operate the connection/disconnection mechanism 14 and the rear wheel fixing mechanism 27. Then, when the linkage/disconnection mechanism 14 is cut off and the fixing mechanism 27 is switched to the fixed state, and the linkage/disconnection mechanism 14 is swung backward, the linkage/disconnection mechanism 14 is connected and the fixing mechanism 27 is switched to the released state. There is. In addition, 31a and 31b in the figure
is an electric switch that is pressed at the front or rear position of the swing lever 28 to turn on lamps 32a and 32b that indicate the steering operation state.

[Brief explanation of the drawing]

The drawings show an embodiment of the steering device for a mobile agricultural machine according to the present invention, in which FIG. 1 is a side view of a combine harvester, FIG. 2 is a schematic plan view of the combine harvester, and FIG. 3 is a mounting portion of a connection/disconnection mechanism. FIG. 4 is a partially cutaway plan view of the same part, FIG. 5 is a schematic perspective view of the connection/disconnection mechanism, and FIG. 6 is a schematic perspective view showing the operation structure of the connection/disconnection mechanism. . 1...front wheel, 2...rear wheel, 11...steering link mechanism, 12...rear wheel steering link mechanism, 1
3... Steering operation tool, 14... Connection/disconnection mechanism, 18... Swinging link for front wheel operation, 20... Swinging link for rear wheel operation, 22... Connection shaft, 23a, 26a... Recess, 23
b, 26b...Protrusion, 24...Clutch body.

Claims (1)

[Claims] 1 A first state in which only the front wheel 1 of the front and rear wheels 1 and 2 is steered by changing the direction, and a second state in which the direction of both the front and rear wheels 1 and 2 is changed and the steering is carried out using the steering operation tool 13. A steering device for a mobile agricultural machine is provided with a mechanism 14 for disconnecting and disconnecting the steering operation tool 13 and the rear wheels 2 in order to switch the connection between the steering operation tool 13 and the rear wheels 2,
4, a swinging link 20 for rear wheel operation with respect to the rear wheel steering link mechanism 12 is provided at one end side of a connecting shaft 22 that connects the steering link mechanism 11 of the front wheel 1 and the steering link mechanism 12 of the rear wheel 2. In addition to being fixedly provided, the connecting shaft 2
2, a front wheel steering link mechanism 1 integrated with a swing link 16 connected to a steering operation tool 13 is disposed on the other end side of the steering link mechanism 1.
A front wheel operating swing link 18 for the front wheel operating swing link 18 is freely rotatably provided on a connecting shaft portion between the rear wheel operating swing link 20 and the front wheel operating swing link 18,
Case fixing frame 25 on the swing link 20 side for rear wheel operation
Recesses 26 are cut out at appropriate intervals in the circumferential direction.
a, and recesses 23a at appropriate intervals in the circumferential direction formed by notches in the end surface of the boss portion of the front wheel operating swing link 18.
A clutch body 24 having protrusions 26b, 23b spaced at appropriate intervals in the circumferential direction that alternatively engage with the clutch body 24 is provided so as to be able to slide only, and furthermore, each of the recesses 26a, 23a and each of the protrusions 26b, 23b The mounting position in the circumferential direction of the front wheel operating swing link 18 is set such that adjacent links are separated from each other by a larger swing angle range than the swing angle range of the front wheel operating swing link 18, and the case is fixed. One recess 26a formed in the frame 25 is connected to the front wheel operating swing link 18.
The front wheel operating swing link 18 is provided at a position where it can engage with the clutch body 24 that engages the front wheel operating swing link 18 only within the swinging range of A steering device for a mobile agricultural machine, characterized in that the disconnection mechanism 14 is constructed by engaging only one protrusion 26b and a recess 26a within a steering operation range by a steering operation tool 13.