Working machine

Abstract

To provide a working machine facilitating compactification of the whole while retaining tilling performance with respect to the working machine connected to a travel machine body and performing a tilling operation.SOLUTION: A working machine includes: an operation frame connected to a travel machine body side; a plurality of disks performing tilling and a lateral ground-leveling rotor performing ground leveling both caused by rotation made along with traveling; and a support device for liftably supporting the ground-leveling rotor on the operation frame side. The plurality of disks are aligned side by side in an attitude of inclining to one of the left and right sides and are supported on the operation frame side. The support device has: a link mechanism for supporting the ground-leveling rotor on the operation frame side; and an actuator for ascending / descending the ground-leveling rotor supported by the link mechanism on the operation frame side by its own telescopic motion. The support device is configured to be able to switch the round-leveling rotor between a state of being expanded behind the plurality of disks aligned side by side vertically displaceably, and a state of being stored on the operation frame side.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a working machine that is connected to a traveling body and performs tilling work.

Background Art

[0002] A working frame connected to the traveling body side, a plurality of disks that perform tilling by rotational operation accompanying the traveling of the traveling body, a left-right leveling rotor that levels the ground by rotational operation accompanying the traveling of the traveling body, and a support device that supports the leveling rotor so as to be vertically movable on the working frame side. The plurality of disks are arranged side by side in a left-right direction in a posture inclined to one side, thereby forming a disk group. The disk group is supported on the working frame side. The support device includes a link mechanism that supports the leveling rotor on the working frame side, and an actuator that is arranged on the working frame side and vertically drives the leveling rotor supported by the link mechanism by its own telescopic operation. The support device is configured to be able to move the leveling rotor up and down in a state where it is deployed behind the disk group. A working machine is known (see, for example, Patent Document 1).

[0003] According to the working machine of the above document, by the vertical movement of the leveling rotor, it is possible to adjust the tilling depth or switch to a non-working height where it does not touch the field. Therefore, it is possible to perform tilling work according to the situation, and while the tilling performance is improved, the leveling rotor is located behind the disk group, the front-rear length becomes long, and it becomes difficult to make the whole compact.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] An object of the present invention is to provide a working machine that is connected to a traveling body and performs tilling work, and that can be easily made compact while maintaining tilling performance.

Means for Solving the Problems

[0006] In order to solve the above problems, a working machine that is connected to a traveling body and performs tilling work, comprising: a work frame connected to the traveling body side; a plurality of disks that are grounded on a field and perform tilling by a rotational operation accompanying the traveling of the traveling body; a left-right leveling rotor that is grounded on the field and levels the ground by a rotational operation accompanying the traveling of the traveling body; and a support device that supports the leveling rotor so as to be movable up and down on the work frame side. A disk group is configured by arranging the plurality of disks side by side in a posture inclined to one side in the left-right direction. The disk group is supported on the work frame side. The support device includes a link mechanism that supports the leveling rotor on the work frame side, and an actuator that is disposed on the work frame side and raises and lowers the leveling rotor supported by the link mechanism by its own telescopic operation. The support device is configured to be switchable between a deployed state in which the leveling rotor can be displaced up and down in a state deployed behind the disk group, and a stored state in which the leveling rotor is stored on the work frame side.

[0007] The disk may be supported on the work frame side by a support tool, and the actuator may be attached and supported on the support tool side.

[0008] The actuator may be an electro-hydraulic cylinder.

Effects of the Invention

[0009] According to the present invention, by switching to the stored state of the leveling rotor, it is possible to shorten the front-rear length and make the whole compact, and by the up-and-down movement of the leveling rotor in the deployed state, it is possible to maintain high tilling performance.

[0010] The disk is supported on the working frame side by a support tool, and according to the actuator being attached and supported on the support tool side, the manufacturing cost is reduced by making the support tool serve multiple purposes.

[0011] According to the actuator being an electro-hydraulic cylinder, it has high versatility without being affected by the structure on the traveling body side.

Brief Explanation of Drawings

[0012]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Modes for Carrying Out the Invention

[0013] FIG. 1 is a side view of an agricultural tractor to which the present invention is applied. The tractor includes a traveling body 1 and a working machine 3 connected to the rear part of the traveling body 1 via a lifting link 2.

[0014] The traveling body 1 has a pair of left and right front wheels 4, 4, a pair of left and right rear wheels 6, 6, a chassis 7 supported by these wheels 4, 4, 6, 6, a bonnet 8 covering an engine (not shown) mounted on the front half of the chassis 7, and a cabin 9 installed on the rear half of the chassis 7. Inside the cabin 9, a control part for the operator to board is provided.

[0015] The working machine 3 is a disk harrow that does not need to input engine power from the traveling machine body 1 side. In this example, the working machine 3 may be connected to the traveling machine body 1 with its center in the left-right direction coinciding or substantially coinciding with the center in the left-right direction of the traveling machine body 1. Note that this working machine 3 may be connected to the traveling machine body 1 in a state offset to one side (left or right) with respect to the traveling machine body 1.

[0016] FIG. 2 is a perspective view of the disk harrow, FIG. 3 is a side view of the disk harrow with the soil cultivating rotor switched to the deployed state, FIG. 4 is a side view of the disk harrow with the soil cultivating rotor switched to the stored state, FIG. 5 is a perspective view showing the structure of the main frame of the disk harrow, and FIG. 6 is a perspective view showing the main part configuration of the disk harrow.

[0017] As shown in FIGS. 1 to 6, the disk harrow 3 is connected to and supported on the traveling machine body 1 side by a three-point lift link 2 behind the traveling machine body 1. This disk harrow 3 is towed by the traveling machine body 1 in a state of being grounded on the field and performs tillage work as the traveling machine body 1 moves forward. It includes a main frame (working frame) 11 connected to the traveling machine body 1 side, a pair of front and rear disk units (disk groups) 12A and 12B supported on the main frame 11 side, a pair of left and right chisels (restricting claws) 13 and 13 arranged further forward of the front disk unit 12A which is the front disk unit and supported and fixed on the main frame 11 side, and a left-right soil cultivating rotor 14 arranged further rearward of the rear disk unit 12B which is the rear disk unit and supported on the main frame 11 side.

[0018] The main frame 11 has a pair of left and right vertical frames 16 and 16 formed in a square pipe shape in the front-rear direction, a pair of front and rear horizontal frames 17 and 17 formed in a square pipe shape in the left-right direction, a single connecting frame 18 formed in a square pipe shape in the left-right direction, and a pair of left and right reinforcing frames 19 and 19 formed in a square pipe shape in the front-rear direction.

[0019] Each of the front and rear horizontal frames 17, 17 is fixed to the vertical frames 16, 16 by welding or the like in a state of being bridged from the upper surface of one of the left and right vertical frames 16, 16 to the upper surface of the other. More specifically, the front horizontal frame 17 is installed and fixed between the front end portions of the left and right vertical frames 16, 16. The rear horizontal frame 17 is installed and fixed between the middle portions in the entire length direction (front-rear direction) of the left and right vertical frames 16, 16.

[0020] In each horizontal frame 17, the portions near the ends in the left-right direction, which is the entire length direction, extend outward to the left and right from the space between the left and right vertical frames 16, 16 in a plan view, constituting the extension portions 17a, 17b.

[0021] The connecting frame 18 is installed and fixed between the portions protruding rearward from the rear horizontal frame 17 at the middle portions of the left and right vertical frames 16, 16. Regarding the fixing means, the left and right ends of the connecting frame 18 are fixed to the left and right inner side surfaces of the adjacent vertical frames 16, 16 by welding or the like.

[0022] One of the left and right reinforcing frames 19 is installed and fixed between the extension portions 17a, 17a on the one side of the front and rear horizontal frames 17, 17, and the other left and right reinforcing frame 19 is installed and fixed between the extension portions 17b, 17b on the other side of the front and rear horizontal frames 17, 17. Each of the reinforcing frames 19, 19 is placed on the upper surface of the horizontal frames 17, 17 and fixed by welding or the like.

[0023] The rearward portions of each reinforcing frame 19 extend further rearward than the rear horizontal frame 17, constituting the extension portions 19a, 19a.

[0024] In this way, the main part is configured, and the main frame 11 is provided with an attachment mechanism. The main frame 11 is attached and supported via this attachment mechanism to the above-described lift link 2 which is a three-point link composed of a single top link 22 and a pair of left and right lower links 23, 23.

[0025] This mounting mechanism has a top mast 24 that protrudes upward from the middle part in all directions of the front horizontal frame 17, and a pair of link brackets 26, 26 that are arranged at positions corresponding to the left and right sides with the top mast 24 in the front horizontal frame 17 sandwiched therebetween in plan view and that protrude forward from the horizontal frame 17.

[0026] The top mast 24 mainly has a pair of plate-shaped side plates 24a, 24a having a symmetrical shape. Each side plate 24a has a shape in which its upper and lower parts stand vertically upward with a thickness direction in the left and right directions, and each part is bent so that the left and right positions of its upper part are located inside its lower part and its middle part inclines upward toward the left and right inside. The top link 22 is pivotally supported between the upper end parts of the side plates 24a, 24a so as to be vertically rotatable at its rear end side.

[0027] Each of the left and right link brackets 26, 26 is arranged at the lower end side of the nearer side plates 24a, 24a in the front horizontal frame 17 and is formed in a channel shape that is open at the rear in plan view. The rear end sides of the left and right lower links 23, 23 are pivotally supported so as to be vertically rotatable within the U-shaped recesses in plan view of the corresponding link brackets 26, 26.

[0028] Also, the upper end part of the top mast 24 and the rear horizontal frame 17 are connected by a pair of symmetrical elongated plate-shaped support frames 27, 27. Each support frame 27 connects the upper end part of the top mast 24 and the part that intersects with the nearer side vertical frame 16 in the rear horizontal frame 17 or the part nearer to the intersection part.

[0029] According to such a structure, the working machine 3 can be lowered to the working position where it is grounded on the farm field with respect to the traveling body 1, and can also be raised to the non-working height where it is not grounded from the farm field. In the following description, unless otherwise specified, it is assumed that the working machine 3 is lowered to the working height.

[0030] The above disk units 12A and 12B are separately supported by the corresponding front and rear horizontal frames 17, 17. Each of the left and right disk units 12A and 12B has a plurality of disks 28A and 28B arranged in parallel in the left - right direction, which is the entire length direction of the horizontal frames 17, 17. The front disk unit 12A is offset to one side (right in the illustrated example, hereinafter simply referred to as "right") in the left - right direction with respect to the center of the working machine 3, and the rear disk unit 12B is offset to the other side (left in the illustrated example, hereinafter simply referred to as "left") in the left - right direction with respect to the center of the working machine 3. The working machine 3 is provided with supports 29 provided for each of the plurality of disks 28A and 28B and individually supporting the disks 28A and 28B.

[0031] In the illustrated example, the disks 28A and 28B are flower - shaped disks made of a disk - shaped sheet metal member curved in a spherical shape. The central portions of these disks 28A and 28B are rotatably attached and supported to the lower ends of the supports 29 via bearings 30. Incidentally, the plurality of disks 28A of one disk unit 12A have their concave sides all facing one side (left side in the direction opposite to the above - mentioned offset side in the illustrated example), and the plurality of disks 28B of the other disk unit 12B have their concave sides all facing the other side (right side in the direction opposite to the above - mentioned offset side in the illustrated example).

[0032] Each support 29 has a cylindrical fixing member 31 that is externally fitted and fixed to the horizontal frame 17 formed in an angle - pipe shape, a pair of left - right plate - shaped support brackets 32, 32 integrally extending from the outer peripheral surface side of the fixing member 31 with their thickness directions facing left and right, and a support arm 33 supported between the left - right support brackets 32, 32 so as to be swingable up and down and protruding obliquely downward to the rear from the support brackets 32, 32 side.

[0033] The fixing member 31 has a pair of split pieces 34, 34 formed in an angular shape in the left - right direction along the horizontal frame 17. Each end portion in the width direction of each split piece 34 extends toward the side where they are separated from each other to form fastening portions 34a, 34a. With the pair of split pieces 34, 34 positioned with the horizontal frame 17 therebetween, their recessed portions facing each other, and the fastening portions 34a, 34a, 34a, 34a bolt - fixed to each other for fastening, the fixing member 31 is attached and fixed to the horizontal frame 17.

[0034] The support bracket 32 is fixed, such as by welding, to the rear and lower - surface sides on the circumferential surface of the fixing member 31 at its front side, and extends in two directions, obliquely downward and rearward and obliquely upward and rearward. Between the portions of the left and right support brackets 32, 32 that extend obliquely downward and rearward, the upper end portion of the support arm 33 is attached and supported by a mounting bolt 36. The mounting bolt 36 also functions as a support shaft serving as a swing fulcrum of the support arm 33.

[0035] The support arm 33 is a plate - shaped member whose thickness direction is oriented left - right. A long hole 33a is formed in this support arm 33, and a regulating pin 37 installed and fixed between the left and right support brackets 32, 32 is inserted through this long hole 33a (see Fig. 6). The support arm 33 swings up and down within the range where the regulating pin 37 displaces in the long hole 33a.

[0036] A compression spring (biasing member) 38 is provided between the portions of the left and right support brackets 32, 32 that extend obliquely upward and rearward and the support arm 33. This compression spring 38 elastically biases the support arm 33 toward the downward - swing side.

[0037] At the lower end of this support arm 33, disks 28A and 28B are rotatably supported via a bearing 30 in a posture inclined to one side, left or right. Regarding the support postures of disks 28A and 28B, to explain in more detail, each of disks 28A and 28B is inclined to the side opposite to the side where it is recessed in a spherical shape on the left and right with respect to the posture of standing upright vertically in a front view or a rear view (the offset side of disk units 12A and 12B). Specifically, a plurality of disks 28A of the front disk unit 12A are all inclined to the right side, which is the offset side thereof, and a plurality of disks 28B of the rear disk unit 12B are all inclined to the left side, which is the offset side thereof.

[0038] According to such a configuration, by the elastic biasing force from the compression spring 38, each of disks 28A and 28B is pressed downward, and the peripheral side thereof stably bites into the soil, rotates as the traveling body 1 moves forward, efficiently excavates the soil in the field for tillage, and moves (casts) the tilled soil to the side opposite to the side where it is inclined (the pulling direction).

[0039] In other words, during the tillage operation when moving forward, the excavated soil is pulled to one side (specifically, the left side) by a plurality of disks 28A of the front disk unit 12A and is pulled to the other side (specifically, the right side) by a plurality of disks 28A of the rear disk unit 12B.

[0040] At the end sides in the pulling direction of the front and rear disk units 12A and 12B respectively, plate-shaped regulating members 39A and 39B for regulating the movement of the soil that has been cast up to that point in the pulling direction are attached and supported on the side of the nearby horizontal frames 17 and 17. In other words, regulating members 39A and 39B are provided on the left end side, which is the end in the pulling direction of the front disk unit 12A, and on the right end side, which is the end in the pulling direction of the rear disk unit 12A respectively.

[0041] The above-mentioned chisels 13, 13 are respectively supported and fixed by a fixture 41 to a portion near one side of the left and right of the front horizontal frame 17 and an intermediate portion.

[0042] The fixture 41 includes a cylindrical fixing member 42 externally mounted and fixed to the horizontal frame 17, a fixing bracket 43 integrally extending downward from the fixing member 42 and formed in a plate shape with its thickness direction facing left and right, and a support frame 44 attached and fixed to the fixing bracket 43 and formed in a plate shape with its thickness direction facing left and right and extending obliquely downward and forward.

[0043] The chisel 13 is formed in a plate shape with its thickness direction facing left and right and having the same direction as the support frame 44 and being long, and has a support portion 13a whose upper part is detachably fixed to the lower part of the support frame 44, and a claw portion 13b which is a plate-shaped main body portion integrally formed at the lower end of the support portion 13a and formed in the front-rear direction along the horizontal direction.

[0044] During the forward travel of the traveling machine body 1, the lower part of the chisel 13 is inserted into the soil, and due to the action of the claw portion 13b located in the soil, the upward movement of the working machine 3 including the disks 28A, 28B is restricted. For this reason, during the tilling operation by towing the lightweight and small-sized working machine 3 and moving the traveling machine body 1 forward, the situation where the working machine 3 floats due to insufficient weight and the efficiency of the tilling operation decreases can be effectively prevented by the chisel 13 inserted into the soil.

[0045] The above-mentioned land preparation rotor 14 is supported on the main frame 11 side by a support device 46. The land preparation rotor 14 is entirely in a cage-shaped cylindrical form, and in a posture with its axis directed in the left-right direction, it is supported by the support device 46 so as to be rotatable with its axis as a fulcrum. The center of the land preparation rotor 14 in the left-right direction is located at the center of the working machine 3 (traveling machine body 1) in the left-right direction.

[0046] The soil preparation rotor 14 has a plurality (five in the illustrated example) of disks 47 formed in a circular flower-shaped plate shape that are arranged in parallel at predetermined intervals in the left-right direction, which is the axial direction of its cylindrical shape, and whose thickness direction is oriented in the left-right direction, and a plurality of left-right edge frames 48 that are evenly arranged at predetermined intervals in the circumferential direction of its cylindrical shape.

[0047] The edge frame 48 projects radially outward from the disk 47 in a side view, and the end portion on the projecting side is formed in a wave shape to form a plurality (specifically, a large number) of teeth 48a. Each edge frame 48 extends throughout the axial direction of the cylindrical shape of the soil preparation rotor 14 and connects and fixes the plurality of disks 47 to each other. At least the main part of the soil preparation rotor 14, which is cylindrical and cage-shaped, is formed by the plurality of edge frames 48 and the plurality of disks 47.

[0048] The support device 46 is provided in a range extending over the middle part of the rear horizontal frame 17, the middle part of the connecting frame 18, and the rear end parts of the left and right vertical frames 16, 16. This support device 46 has a link mechanism 49 that supports the soil preparation rotor 14 on the main frame 11 side so as to be movable up and down, and an actuator 51 that is arranged on the main frame 11 side and drives the soil preparation rotor 14 to move up and down by means of telescopic operation.

[0049] The link mechanism 49 has a pair of support cylinders 52, 52 that are fixed to the upper surfaces of the rear end parts of the left and right vertical frames 16, 16 respectively and are formed in a cylindrical shape in the left-right direction with the same axis, a single shaft 53 that is collectively inserted on the inner peripheral surface side of both the left and right support cylinders 52, 52, a pair of left and right support arms 54, 54 that are supported on the main frame 11 side so as to be swingable back and forth with the shaft 53 as a fulcrum, and a linkage mechanism that operates in conjunction with the back-and-forth swing of the support arms 54, 54.

[0050] Each of the left and right support arms 54, 54 is formed in a plate shape having a thickness on the left and right and extending linearly from the base end to the tip end. The left and right support arms 54, 54 are attached and fixed to the left and right end portions of the shaft 53, respectively, such that they are in the same swinging position as each other in a side view. That is, the left and right support arms 54, 54 swing back and forth integrally with the shaft 53 while maintaining the same posture as each other in a side view.

[0051] Between the tip ends, which are the ends of the left and right support arms 54, 54 on the side opposite to the base end portions, a leveling rotor 14 is rotatably installed and supported via bearings 57, 57 with its axis as a fulcrum.

[0052] The interlocking mechanism includes an operation arm 58 that protrudes upward from the middle part of the connecting frame 18 and swings back and forth, an operating arm 59 that protrudes rearward from the shaft 53 and swings up and down integrally with the shaft 53, and a link 61 that connects the operation arm 58 and the operating arm 59 to interlock them. Each of the operation arm 58, the operating arm 59, and the link 61 is configured by connecting a pair of left and right metal plate members to each other and fixing them with a spacer or the like.

[0053] The lower end portion of the operation arm 58 is attached and supported on the upper surface side of the connecting frame 18, and swings back and forth with the lower end portion as a fulcrum. The link 61 is formed in an arc shape that bulges obliquely upward rearward in a side view so as to avoid the shaft 53.

[0054] The interlocking mechanism is configured such that by swinging the operation arm 58 rearward to swing the operating arm 59 downward, the support arms 54, 54 are swung rearward to displace the leveling rotor 14 rearward, while by swinging the operation arm 58 forward to swing the operating arm 59 upward, the support arms 54, 54 are swung forward to displace the leveling rotor 14 forward.

[0055] The support device 46 configured as described above can switch the leveling rotor 14 between a deployed state where it is deployed rearward of the rear disk unit 12B and its vertical position can be adjusted, and a stored state where it is stored forward on the main frame 11 side (see FIG. 4), by the back-and-forth rocking of the support arms 54, 54.

[0056] Furthermore, in the above-described deployed state, there are two types: a working state (see FIG. 1) where the leveling rotor 14 is lowered to a height where it contacts the field surface side, and a non-working state (see FIG. 3) where it is raised to a height where it is not in contact with the field surface. The switching of the leveling rotor 14 between one of the working state and the non-working state and the other, and vice versa, is also performed by the back-and-forth rocking of the support arms 54, 54 (i.e., the back-and-forth rocking by the operating arm 58).

[0057] Incidentally, when the leveling rotor 14 is switched to the stored state, it or the support arms 54, 54 contact the extended portions 19a, 19a of the left and right reinforcing frames 19, 19 and are supported from below.

[0058] The actuator 51 is an electro-hydraulic cylinder in which a hydraulic tank, a hydraulic pump driven by an electric motor, and a hydraulic cylinder are integrally unitized. One end side (base end side) of the telescoping portion (specifically, the cylinder tube 51a and the piston rod 51b) of the actuator 51 is attached and supported on the main frame 11 side so as to be vertically rotatable, and the other end side (tip end portion) is connected to the upper end side of the operating arm 58 so as to be vertically rotatable.

[0059] Specifically, the actuator 51 is attached and supported by a support 29 disposed at a portion near the center of the rear horizontal frame 17. More specifically, a pair of left and right interlocking side brackets 62, 62 extend integrally forward and upward from the upper surface and the front surface of the fixing member 31 of this support 29. The left and right interlocking side brackets 62, 62 are L-shaped in side view, and the base end portion of the actuator 51 is attached and supported between the front end side and the upper end side portions so as to be vertically swingable.

[0060] By extending the actuator 51, the operating arm 58 is swung rearward, while by contracting the actuator 51, the operating arm 58 is swung forward. Since the extension operation of the actuator 51 can also be performed using the self-weight of the leveling rotor 14, a single-acting type that hydraulically operates only on the contraction side may be used, but in this example, a double-acting type that hydraulically operates on both the extension side and the contraction side is used.

[0061] Incidentally, normally, if the supply and discharge of pressure oil to the actuator 51 are stopped, the operating arm 58 can be fixed at a predetermined front-rear swing position. However, when the leveling rotor 14 is heavy, a situation is assumed where the supply and discharge of pressure oil to the actuator 51 are forcibly generated and the operating arm 58 swings downward unintentionally. To prevent such a situation, in this example, as described above, a structure is adopted in which the leveling rotor 14 is supported from below by the reinforcing frames 19, 19.

[0062] When the traveling machine body 1 is advanced while the leveling rotor 14 is switched to the working state, the leveling rotor 14 rotates and pulverizes the lumps of soil excavated and cultivated by the front and rear disk units 12A, 12B with a large number of teeth 48a arranged in the left-right direction, and levels the field surface for leveling.

[0063] In addition, the support device 46 is provided with a telescopic member 63 as a display means for displaying the position of the leveling rotor 14 (in other words, the front-rear swing position of the operating arm 58) (see FIG. 6). Further, a wired or wireless remote control (not shown) for operating the expansion and contraction of the actuator 51 may be provided to control the state of the leveling rotor 14 from a position away from the control unit and other working machines 3.

[0064] The telescopic member 63 has a sleeve 63a and a rod 63b that is coaxially aligned with the sleeve 63a and is accommodated and supported in the space on the inner peripheral surface side of the sleeve 63a so as to be reciprocally movable in the axial direction. When the rod 63b moves and is accommodated within the sleeve 63a in its axial direction, the overall length of the telescopic member 63 is reduced. On the other hand, when the rod 63b moves out of and protrudes from the sleeve 63a in its axial direction, the overall length of the telescopic member 63 is extended.

[0065] And, like the actuator 51, one end of this telescopic member 63 is pivotally attached and supported between the front end side and the upper end side portions of a pair of left and right interlocking brackets 62, 62, and the other end is pivotally connected to the upper end side of the operation arm 58 so as to be pivotable up and down. Therefore, in conjunction with the expansion and contraction of the actuator 51, the telescopic member 63 also expands and contracts. The expansion and contraction state of the telescopic member 63 can be objectively grasped if the amount of protrusion of the rod 63b from the sleeve 63a is known, and this amount of protrusion can be confirmed by visually observing a scale (not shown) printed or engraved on the outer peripheral surface of the rod 63b.

Explanation of Signs

[0066] 1 Traveling body 3 Disk harrow (working machine) 11 Main frame (working frame) 12A Front disk unit (disk unit, disk group) 12B Front disk unit (disk unit, disk group) 14 Soil tilling rotor 28A Disk 28B Disk 29 Support 46 Support device 49 Link mechanism 51 Actuator (electro-hydraulic cylinder)

Claims

1. A working machine that is connected to a traveling body and performs tilling work, a work frame connected to the traveling body side, a plurality of disks that are grounded in the field and perform tilling by rotational operation accompanying the traveling of the traveling body, a left-right leveling rotor that is grounded in the field and levels the ground by rotational operation accompanying the traveling of the traveling body, a support device that supports the leveling rotor so as to be vertically movable on the work frame side, and is provided with, a disk group is configured by arranging a plurality of the disks side by side in a left-right direction in a posture inclined to one of the left and right, the disk group is supported on the work frame side, the support device includes a link mechanism that supports the leveling rotor on the work frame side, and an actuator that is arranged on the work frame side and raises and lowers the leveling rotor supported by the link mechanism by its own expansion and contraction operation, the support device is configured to be switchable between a deployed state in which the leveling rotor can be vertically displaced in a state deployed behind the disk group and a stored state stored on the work frame side, characterized by a working machine.

2. The disk is supported on the work frame side by a support tool, the actuator is attached and supported on the support tool side, The working machine according to claim 1.

3. The actuator is an electro-hydraulic cylinder The working machine according to claim 1.

Images