JP2605980Y2 - Rotary cover position detection device of tillage device in agricultural tractor - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a position detecting device for a rotary cover of a tilling device in an agricultural tractor equipped with a hitch device. Sensor side mechanism automatically
The present invention relates to a position detecting device for a rotating cover that is detachably attached to and detached from mechanical transmission means of a tilling device.

[0002]

2. Description of the Related Art A tillage device in an agricultural tractor is configured to adjust a support height of a tillage claw according to a tillage depth.
A fixed cover (fixed rotary main cover) covers the upper part of the tilling claw, and a rotating cover (rotary cover) that protrudes and retracts rearward from the fixed cover is provided. A rear cover is attached to the rotating cover so as to be vertically rotatable. In recent years, a type in which the rotating cover is controlled to the immersion / projection position in accordance with the depth of cultivation and shallowness has been used. This rotary cover is normally driven and controlled by an electric cylinder attached to a tillage device.

In a conventional method for controlling the rotation cover to a set protrusion / retract amount (rotation angle), a stroke sensor for detecting the protrusion amount of an output rod of the electric cylinder is mounted in parallel with the electric cylinder, A harness is connected to a controller attached to the riding traveling body, and a tillage depth setting device is attached to the driver's seat so that the output signal of the stroke sensor matches the set value signal from the tillage depth setting device. The electric cylinder is controlled.

[0004] By the way, the agricultural tractor is integrally provided with a hitch type in which the riding body and the rear elevating link and the tilling device can be separated by an automatic hitch mechanism with a single touch, and a tilling device behind the elevating link. There is a direct mounting type (type without hitch). Therefore, in a hitch type agricultural tractor, a connector for disconnecting the harness is attached to the outside of the hitch device for disconnecting the tilling device from the riding traveling body. Since the sensor signal for detecting the operation of the stroke sensor is a very weak current, a high-precision harness is required, and it is difficult to attach and detach the harness portion with one touch.

[0005]

[Problems to be Solved by the Invention] Therefore, when detaching the tilling device, there is a case where the disengagement of the hitch device, such as the release of the hitch device, is excessively forgotten, and the harness is forcibly disconnected and the harness is disconnected unexpectedly. there were. Also,
In the conventional one in which the stroke sensor is mounted on the tilling device side, a stroke sensor is required for each tilling device, and the output of the stroke sensor mounted on the tilling device needs to be adjusted according to the controller mounted on the riding traveling body. There is also a problem that there is.

Therefore, a position detecting sensor instead of the stroke sensor is mounted on the side of the riding traveling machine body, and the position detecting sensor and the tilling device side are removably connected by a mechanical mechanism. If the mechanical connection portion is automatically disconnected when the cable is detached, the harness can be omitted, and there is an advantage that the harness may be disconnected and the output adjustment of the sensor is not required. However, in order to employ such mechanical connection means, it is necessary to replace the movement of the position movement of the rotating cover with the displacement of other members such as a rod and a lever.
It is necessary to secure an area around the area that allows displacement.

The cylindrical case for supporting the tilling claw protrudes left and right from a gear box arranged in the center of the tilling device, and a power transmission shaft for driving the tilling claw is provided inside, and a chain case is provided at one end. , A bearing case is attached to the other end, and a mast arm extends downward from the top mast provided in the center upper portion of the gear box to the left and right, and a lower end of the mast arm is supported by the cylindrical case. I have to. This mast arm is required to be mounted as short as possible for the purpose of securing the strength, so that the structure between the cylindrical case and the mast arm is inevitably narrow. The fixed cover is mounted close to the cylindrical case, and the space between the two members is narrow.

Accordingly, in order to transmit the moving position of the rotating cover to the riding traveling machine body by mechanical means, interference with other members, especially the mast arm and the cylindrical case is eliminated so as not to hinder various operations. In addition, it is necessary to attach the mechanical transmission means as close as possible to the fixed cover and penetrate a narrow space between the mast arm and the cylindrical case. Further, when developing a hitch type having a mechanical transmission means, another requirement is as follows.
Increasing the number of common parts with the rotating cover position detection device attached to the non-hitch type tilling device, and using the same software input to the control device to increase the compatibility of the device,
It is desired to improve the efficiency of manufacturing and maintenance work and reduce costs.

In view of the above, the present invention has been made in view of the above-described problems. In a tillage device for an agricultural tractor having a hitch device, a position detecting device for detecting the moving position of the rotary cover on the side of a riding traveling machine body. A sensor is attached, the movement position of the rotating cover is mechanically transmitted to the position detection sensor, and when the hitch device is cut off, a part of the transmission mechanism is automatically cut off. It is an object of the present invention to provide a rotary cover position detecting device of a cultivating device in an agricultural tractor in which components are considered as much as possible so that it can be used also as a rotary cover position detecting device of a cultivating device.

[0010]

SUMMARY OF THE INVENTION In order to achieve the above object, the structure of the rotary cover position detecting device of the tillage device in the agricultural tractor of the present invention is provided by a hitch device connected to the rear of the riding vehicle. In the agricultural tractor that detachably connects the tilling device, a cylindrical case that serves both as a support for the tilling claw portion and a power transmission shaft case to the claw portion and extends in the left-right direction from the gear case is attached to the tillage device. A fixed cover that covers the upper part of the tilling claw is disposed near the lower side of the case, and a rotating cover that covers the rear of the fixed cover and has a rear cover is provided between the fixed cover and the cylindrical case. The guide arm is guided by the guide rail provided so as to rotate back and forth so as to be freely retractable, and a link arm is provided on the tilling apparatus side near the front side of the cylindrical case, and the link arm is provided in a cylindrical case.
A connecting rod that is vertically rotatably supported on the cylindrical case side at a position lower than the axial center of the cylindrical case and connects a free end side of the link arm and the rotating cover to the cylindrical case; Mounted on the link arm, formed on an arcuate cam surface bulging toward the hitch device side of the link arm, and a driven arm that rotates in contact with the cam surface is pivotally supported on the hitch device side,
The cam surface of the link arm and the driven arm are automatically detachably formed by attaching and detaching the tilling device to and from the hitch device, a wire is attached to the free end side of the driven arm, and a position detection sensor attached to the riding traveling machine body side. mechanically transmits the movement position of the turning cover and the cylindrical case side of the link arm is formed into a concave shape, the turning cover is rotated toward the rear of the plow, to the connecting rod When the link arm is driven to rotate toward the cylindrical case, interference with the cylindrical case is prevented.

The position detection sensor may use a potentiometer. However, the present invention is not limited to this, and any sensor can be used as long as it can convert the amount of movement of the wire into an electrical amount.

[0012]

The concave portion formed on the cylindrical case side of the link arm is retracted when the link arm is pulled rearward along with the rearward movement of the rotating cover in the setting of shallow tillage and rotates toward the cylindrical case side. The portion overlaps above the cylindrical case, so that the line connecting the connecting rod shaft fulcrum at the end of the link arm and the pivot base side fulcrum of the link arm can rotate to a position where the line intersects the cylindrical case. Can be attached to the vicinity of the cylindrical case, and the link arm can be rotatable in a low posture. Therefore, the concave portion of the link arm has an effect of shortening the mechanical connecting portion for mechanically transmitting the stroke of the rotating cover to the riding traveling body side and reducing the height.

The means for attaching a wire to the driven arm that pivotally supports a driven arm that rotates in contact with the cam surface of the link arm and that attaches a wire to the driven arm is provided when the riding body and the tilling device are attached and detached. The contact between the surface and the driven arm is automatically disengaged, so that when removing the tilling device from the hitch device, there is no need to perform the work of separating the mechanical transmission means that transmits the rotation cover position to the position detection sensor. is there.

[0014] In the case of a tilling device without a hitch, if the wire is directly attached to the link arm,
The components used in the rotation cover position detecting device of the present invention can be shared, and the software of the rotation cover drive control device can be made compatible.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail with reference to an embodiment shown in the accompanying drawings. The outline of the agricultural tractor 1 used in this embodiment will be described with reference to FIG. The tillage device 2 is connected to a riding vehicle 4 (only the rear portion is shown) by a hitch device 3. 1 shows a state in which the riding machine 4 lifts the tilling device 2 and stops the tilling work. Reference numeral 5 shown in FIG. 1 denotes a tilling nail, and reference numeral 5a denotes a rotation locus of the tip of the tilling nail 5. It is.

In FIGS. 1 and 2, the tilling apparatus 2 comprises a left cylindrical case 2c provided with a drive shaft (not shown) therein, which projects leftward from the left and right cylindrical cases 2c and 2d. Case 2d (FIG. 2) extends rightward, and a chain case 2e containing a chain (not shown) for transmitting power to the tilling claw 5 is attached to the end of the left cylindrical case 2c. A bearing case 2f (FIG. 2) of a bearing (not shown) for supporting the tilling claw 5 is attached to the end of 2d. The left and right cylindrical cases 2c and 2d are provided with the gear case 2 respectively.
Mast stays 2g, 2g fixed to a top mast 2a supported above b are supported. The front end of the top mast 2a is detachably supported by a concave groove formed in a hitch portion 3a fixed to an upper portion of a hitch frame 3b described later. Toolbar 2h supported on gear case 2b
Is mounted with a tail wheel 2i, and a tail wheel 2i is configured together with a toolbar 2h by a manual driving device 2j.

The fixed cover 6 covers the upper part of the tilling claw 5.
a, and a rotating cover 6b (FIG. 2) is provided at the rear thereof. The rotating cover 6b is fitted to and guided by symmetrical guide rails provided on the upper surface of the fixed cover 6a. Is provided. Further, a rubber plate (not shown) is stretched between the rear end of the fixed cover 6a and the horizontal frame 6e to cover the entire area above the tilling claw 5. Then, the drive rod 7b that protrudes and retracts from the electric cylinder 7 having a fulcrum formed at the center of the horizontal frame 6e, and protrudes and retracts from behind the fixed cover.

[0018] Incidentally, the horizontal frame 6e of the turning cover 6b is a rear cover 8 which lower end also serves as the tilling depth sensor has been attach freely vertically rotate, the reference numeral 7a is an electric cylinder 7 shown in FIG. 1 It is a driving motor. The power cord of the motor 7a is divided by a female switch 7c attached to the side of the hitch 3a and a male switch 7d attached to the side of the top mast 2a. The switches 7c and 7d are automatically coupled / separated by the attachment / detachment.

The lift device and the hitch device 3 of the tilling device 2 will be described. As shown in FIG. 1, lower links 4 are provided on the lower left and right sides of the transmission case 4a of the passenger traveling vehicle body 4.
b, 4b, the lower link 4b, 4b supports the lower part of the hitch frame 3b, and the top link 4d is supported by the top link support 4c mounted on the upper side of the transmission case 4a. , This top link 4
d is pivotally supported on the front end of the upper hitch 3a. The lift operation of the tilling apparatus 2 is performed by raising and lowering the lift arm 4f by hydraulic pressure via a lift rod 4e rotatably supporting the lower link 4b. Also,
In a guide groove 3c provided in the upper hitch portion 3a, a hook switching operation rod 3d for connecting / disconnecting a hook provided in the lower hitch portion of the hitch device 3 is loosely fitted.

Next, the rotating cover position detecting device of the present embodiment will be described with reference to FIGS. In the figure, a bracket 9a having a U-shaped cross section in a plan view is attached to a front portion of the gear case 2b with supporting arms protruding forward on both sides, and fixed to the left side of the bracket 9a. That is, the left cylindrical case 2
A shaft 9c was attached to the support plate 9b located on the side c, and the base end of the link arm 10 was pivotally supported on the shaft 9c.

The rear surface of the link arm 10 has a concave portion 10a on the left cylindrical case 2c side, and the opposite front surface has an arcuate arcuate cam surface 10b bulging forward. .
A link is formed by pivotally supporting a connecting rod 10d on a shaft 10c provided at the tip of the link arm 10 and a shaft 6d provided on the rotating cover 6b. Therefore, when the rotating cover 6b moves rearward, that is, rotates in the direction of arrow A in FIG. 3, and when the link arm 10 is pulled in the direction of arrow B and rotates, finally, as shown in FIG. And the line (two-dot chain line) connecting the shaft 9c and the shaft 10c intersects the left cylindrical case 2c. As described above, by forming the link arm 10 in an arc shape that bulges forward, the left cylindrical case 2c and the mast stay 2 are formed.
In the narrow part between the link arm 10 and the connecting rod
It is possible to form a rotation area of 10d. Therefore, the shaft 9c is mounted at a low position close to the fixed cover 6a, so that the mast stay 2g is required to be as short as possible in terms of strength maintenance, and the space requirement in which a necessary rotation area of the link arm 10 is secured. In spite of the fact that these are contradictory, the adoption of the above configuration has satisfied both conflicting requirements.

On the other hand, a driven arm 11 that is driven by the link arm 10 is attached as follows. That is, the transmission shaft bracket 11a that protrudes from the center of the above-described hitch frame 3b that is swingably attached to the rear of the riding traveling machine body 4 is attached.
The shaft 11c attached to the support plate 11b that is overhanging
Then, an intermediate portion of the driven arm 11 is pivotally supported. This driven arm
A roller 11d is attached to the tip of the shaft 11, and a shaft 11 attached to the arm 11e at the other end extending to the opposite side to the tip of the driven arm 11.
f, one end of a wire cable 12a composed of an outer cable and an inner cable is pivotally supported, and the driven arm 11 is always in the rotation direction of the arrow C shown in FIG. 3, ie, the roller 11d is always in contact with the cam surface 10b by the spring s. Biased in the right direction.

Reference numeral 11g shown in FIG. 5 denotes a plate for fixing the wire cable 12a. The lower end of the plate 11g is configured so that the arm portion 11e contacts the driven arm 11. The driven arm 11 is formed as a stopper for preventing the driven arm 11 from going too far in the direction of arrow C (FIG. 3) when the tilling apparatus 2 is detached. Therefore, the connection operation between the driven arm 11 and the link arm 10 when the tillage device 2 is mounted on the hitch device 3 can be made smooth.

The driven arm 11 is constructed as described above.
When the tillage device 2 is connected to the hitch device 3, the roller 11d presses the cam surface 10b, the driven arm 11 rotates in the direction of the arrow C against the link arm 10, and the wire cable 12a By pulling in the direction D, the connection operation between the driven arm 11 and the link arm 10 is completed. As shown in FIGS. 2 and 6, the wire cable 12a is inserted through a hole 12b formed in the top link support 4c to traverse the top link support 4c, and is attached to a position detection sensor attached to the opposite side of the top link support 4c. It is attached to 13. In this way, top link support 4
With a simple structure in which a hole 12b is formed in the wire c, a sufficient length of the wire cable 12a is secured, and the top link support 4c is also used as a support member of the wire cable 12a, so that the wire can be turned up and down. It is possible to smoothly follow the stroke of the rotating cover regardless of the position of the tilling device 2 to be moved. Therefore, the resistance of the wire cable 12a is reduced, and the driven arm 11 and the link arm
There is an advantage that the contact action with 10 can be made smooth.
As the position detection sensor 13 of this embodiment, a potentiometer type was used.

Next, an outline of the rear cover position detecting device will be described. As shown in FIGS. 3 and 7, a link rod 8c provided with a spring is provided between an arm 8a provided on a mast frame 6f erected on a rotating cover 6b and an arm 8b provided on a rear cover 8, and a rear cover 8 is provided. Detection end 8d
Is constantly biased toward the ground G side. Then, the rotation position of the detection end 8d is transmitted to the position detection sensor 14 by means similar to the rotation cover position detection device described above. Referring to FIG. 4, an outline thereof will be described. A link arm 14c having a return spring 14b attached thereto is pivotally supported on a rotating shaft 14a attached to the right side (right cylindrical case 2d side) of the bracket 9a. A wire 8e for transmitting rotation of the rear cover 8 was connected to a shaft 14d attached to the shaft 14c, and a cam mechanism having the same configuration as described above in a side view was used.
Therefore, in FIG. 5, the same reference numerals as those of the rotating cover position detecting device are also given to the rear cover position detecting device side, and the description is omitted.

The other end of a wire cable 14e connected to the position detecting sensor 14 is supported on a shaft 11f attached to the driven arm 11 of the rear cover position detecting device. Therefore, when the tilling device 2 is attached or detached, the rear cover position detecting device can be automatically disengaged. Next, FIGS. 8 and 9 show an example in which most of the parts of the rotating cover position detecting device of the present embodiment described with reference to FIGS. 1 to 7 can be used for forming the rotating cover position detecting device of the non-hitch agricultural tractor. explain. That is, in the embodiment described above, the mechanical transmission means is constituted by the combination of the link arm 10 and the driven arm 11, but in the case of the non-hitch type, the driven arm 11 is omitted. Would. For this purpose, a link arm 10 having a hole 15 (FIGS. 3 and 7) is used. The relative position of the hole 15 with respect to the axis 9c is determined by the axis of the driven arm 11 that follows the cam surface 10b of the link arm 10.
Axle 11e for attaching wire cable 12a to 11c
Is provided so as to be substantially the same as the relative position of Therefore, the operation stroke of the wire cable 12a due to the swing of the link arm 10 can be made substantially the same between the case with the hitch type and the case without the hitch type, and most parts including the link arm 10 can be shared. Things.

Then, the top mast 2a of the tillage device 2 (FIG. 8.9) of the non-hitch agricultural tractor is pivotally supported on a top link 4d which is pivotally supported on a top link support 4c of a riding machine (not shown). The end of the wire cable 12a was directly supported on a shaft 15b attached to the hole 15 (FIGS. 3 and 7). All other specifications were formed using the same tillage device 2 and riding traveling body 4 as the hitch-equipped agricultural tractor 1 and connected without using the hitch device 3, so the same members are given the same reference numerals and described. Is omitted.

When the rotary cover 6b of the agricultural tractor without hitch is moved backward to the maximum stroke, the concave portion 10a of the link arm 10 covers the left cylindrical case 2c as shown in FIG. With the line connecting the shaft 9c, which is the fulcrum, and the shaft 10c, which is the shaft fulcrum of the connecting rod 10d, intersecting with the left cylindrical case 2c, the turning area of the link arm 10 and the connecting rod 10d is set to a large turning angle, And few
Mast stay 2 which can be secured effectively in a small space, and thus has the link arm 10 mounted at a low position.
It can be installed in a state where interference with g is prevented.

[0029]

As described above, in the rotary cover position detecting device of the tilling device in the agricultural tractor according to the present invention, the shaft fulcrum of the link arm is provided at a low position in front of the cylindrical case. When the rotation cover reaches its maximum stroke , a line connecting the two shaft fulcrums is formed into a cylindrical case by notching a concave portion between the rod fulcrum and the link fulcrum on the link arm side connecting the rotary cover. So that even if there is not enough room in front of and above the cylindrical case, the stroke transmitting rod connected to the link arm and the rotating cover can rotate at a sufficient rotating angle.
It is possible to ensure. Therefore, it is possible to arrange the rod so as to bypass the upper part of the cylindrical case,
The assemblability and maintainability are improved. Further, since the stroke transmitting means between the hitch device and the tilling device is performed by the arcuate cam formed in an arc shape and the driven arm, the position detecting device for the rotating cover is automatically detected at the same time as the cultivating device is attached to and detached from the hitch device. Since attachment / detachment is also performed, it is possible to improve the workability and eliminate the risk of damage to the device due to a mistake in the work procedure.

[Brief description of the drawings]

FIG. 1 is a side view of a main part of an agricultural tractor used in an embodiment of the present invention.

FIG. 2 is a plan view of FIG.

FIG. 3 is an enlarged view of a portion of the rotating cover position detecting device in FIG. 1;

FIG. 4 is a view taken along the line IV-IV in FIG. 3;

FIG. 5 is a view taken along line VV of FIG. 3;

FIG. 6 is a side view of a main part of the rotating cover position detecting device shown in FIG. 2;

FIG. 7 is a partial side view showing an operation state of the rotation cover position detection device shown in FIG. 3;

FIG. 8 is a side view of a main part when the rotating cover position detecting device shown in FIG. 3 is applied to a non-hitch type agricultural tractor.

9 is a partial side view showing an operation state of the rotation cover position detection device shown in FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Agricultural tractor 2 Tilling device 2c Left cylindrical case 2 d Right cylindrical case 3 Hitch device 4 Riding machine body 5 Tilling claw 6a Fixed cover 6b Rotating cover 8 Rear cover 9c Shaft fulcrum 10 Link arm 10a Depression 10b Cam surface 10c Shaft fulcrum 10d Connecting rod 11 Followed arm 12a Wire 13 Position detection sensor 14a Wire

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) A01B 63/10-63/12 A01B 33/12 A01B 59/043

Claims (1)

(57) [Scope of request for utility model registration] An agricultural tractor for removably connecting a tilling device to a hitch device connected to the rear of a riding traveling body, which serves as a support for a tilling claw portion and a power transmission shaft case to the claw portion, and A cylindrical case extending from the gear case in the left-right direction is attached to the tillage device, a fixed cover is provided near the lower side of the cylindrical case and covers the upper part of the tilling claw, and a rear cover of the fixed cover is covered. Is provided on a guide rail provided between the fixed cover and the cylindrical case so as to be rotatable back and forth so as to be able to protrude and retract, and a link arm is provided near the front side of the cylindrical case. The tillage device side, and the link arm is pivotally supported at a position lower than the axis of the cylindrical case so as to be vertical and rotatable toward the cylindrical case side, and the free end side of the link arm. And a link connecting the rotary cover A rod is mounted on the cylindrical case over the cylindrical case, formed on an arcuate cam surface bulging toward the hitch device side of the link arm, and a driven arm rotating in contact with the cam surface is provided on the hitch device. The cam surface of the link arm and the driven arm are automatically detachably formed by attaching and detaching the tilling device to and from the hitch device, and a wire is attached to the free end side of the driven arm, so that the The moving position of the rotating cover is mechanically transmitted to the attached position detection sensor, and the cylindrical case side of the link arm is formed in a concave shape, and the rotating cover rotates toward the rear of the tillage device. A rotation cover position detecting device for a tilling device in an agricultural tractor, which prevents interference with the cylindrical case when the link arm is rotated toward the cylindrical case following the connection rod .