JP2793122B2 - Farm work machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an agricultural machine connected to a tractor or the like.

[0002]

2. Description of the Related Art In a farming machine connected to a lifting device provided at the rear of a tractor or the like, particularly a harrow or a cultivator having a machine width in a direction orthogonal to the traveling direction, the both sides of the machine body are positioned at a center side. Folding structures are known. For example, Japanese Unexamined Utility Model Publication No. 1-163907 discloses that a working machine extending left and right is rotated around a vertical or inclined connecting pin provided on a main body frame to substantially reduce the machine width, thereby enabling the vehicle to travel on a road. The storage is facilitated. As shown in FIG. 7, the tillage device disclosed in Japanese Patent Application Laid-Open No. 61-282001 includes a center tillage device 102 connected to a rear portion of a tractor 101, and side tillage devices 103, 104 provided on both sides thereof. , And is rotated around horizontal shafts 105 and 106 as necessary.

[0003]

By the way, in the above-mentioned conventional agricultural working machine, by deploying the left and right working machines having a considerable weight, the center of gravity largely moves upward or backward, and the maneuverability and the maneuverability in the folded posture are improved. There was a problem that stability was reduced.

Further, since a chain case and a gear case for transmitting power to the left and right working machines are provided at both ends or between the center cultivator 102 and the side cultivators 103 and 104, only the installation location is required. There was a problem that it could not be plowed and it was difficult to re-till.

In view of the above circumstances, the present invention has been devised in order to provide an agricultural work machine capable of preventing a decrease in maneuverability and stability at the time of folding, and an agricultural work machine which does not cause residual tillage.

[0006]

According to the present invention, a left and right working unit is connected to both sides of a central working unit in a machine width direction, and is linearly connected to the center working unit in the width direction. In an agricultural work machine provided to be foldable upward, a main frame is formed by providing a main punch for supporting the central working portion above the central working portion, and supporting the left and right working portions above the left and right working portions. The left and right connecting punches are provided to form a left and right frame, and the left and right connecting punches of the left and right frames are formed so as to extend toward the central working portion side and to be joined to the ends of the left and right connecting punches. The main punch is formed to be shorter than the width, and a pivot is provided at the upper part of the joint between the main punch and the left and right connecting punches, and the left and right connecting punches are connected to the main punch so as to be rotatable upward. It is preferable that each of the working units has a working shaft, and power is transmitted to the working shaft by an output shaft that is inserted from the main punch into the connecting punch. The pivot is preferably formed to be slightly inclined from horizontal so that the left and right frames can be developed obliquely rearward and folded. When the left and right frames are unfolded and folded obliquely rearward, the positions of the pivots connecting the left and right connecting punches and the main frame are such that the folded left and right working portions are substantially within the width of the central working portion. Is preferably determined. Further, a fixing device may be provided between the main frame and the left and right frames to fix the working units in a posture aligned in a straight line in the machine width direction.

[0007]

According to the above construction, the length of the left and right working portions is shorter than the entire length of the portion that rotates around the pivot, and the movement of the center of gravity when folded toward the central working portion is suppressed. The clutch mechanism connects the respective working shafts when the left and right working units are connected to the central working unit in the machine width direction. The transmission mechanism transmits the driving force from one side end to each working shaft by coupling the clutch mechanism. The configuration in which the pivot axis is appropriately inclined prevents the center of gravity from largely moving backward, and also avoids interference with the power side of the tractor or the like. With the configuration in which the left and right working units are deployed to the inside of the central working unit, the machine width in the folding posture can be determined by the length of the central working unit. Further, the fixing device keeps the posture in which the respective working units are aligned in a straight line.

[0008]

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

FIGS. 1 to 3 show an embodiment of an agricultural work machine according to the present invention applied to a harrow 1. FIG. The harrow 1 includes a central working unit 3 connected to a rear portion of a tractor (not shown), and a left working unit 6 and a right working unit 7 arranged on both sides in the machine width direction. The left and right working parts 6 and 7 are rotatable around a pivot pin 26 serving as a pivot, and are folded toward the center as needed. Each of the working units 3, 6, 7 includes a working shaft 40, 70, 75 extending in the machine width direction, and a working shaft 40, 70, 75.
And a large number of work claws 41 radially attached at predetermined intervals in the axial direction, and the work claws 41 are turned by the rotation drive of the work shafts 40, 70, 75 so as to perform crushing, digging, etc. Has become. Each working axis 40, 70, 75
Are suspended by hollow main rods 14 and 15 and left and right connecting rods 46 and 72, respectively.
4, 15 and the central working unit 3 are integrated into the main frame 2
The left frame 4 is formed integrally with the left connecting rod 46 and the left working unit 6, and the right frame 5 is formed integrally with the right connecting rod 72 and the right working unit 7.

A transmission 13 is provided at an intermediate position (center in the machine width direction) between the main rods 14 and 15, and accommodates an input shaft 11 for obtaining a rotational driving force from a driving source such as a tractor. A top stay 22 for connecting to a lifting device such as a three-point link is provided on the top and both sides of the mission 13.
And lower arms 20, 21 are provided. Main rod 1
Connecting members 1 protruding in the radial direction at both outer ends of 4, 15
The left and right connecting rods 46 and 72 are opposed to a tubular connecting member 47 having a rectangular cross section formed at the end of the left and right connecting rods 46 and 72. The ends of these connecting members 16, 17, 47 are appropriately overlapped, and the pivot pin 26 is inserted into the upper end position. In the present embodiment, the pivot pin 26 extends in the traveling direction F in plan view and is slightly inclined so that the front is higher (about 15 degrees from horizontal). That is, as shown by the two-dot chain line in FIG. 2, the left and right frames 4 and 5 are folded obliquely upward and backward.

The position of the pivot pin 26 is located closer to the center than both ends of the central working unit 3 (indicated by an axis B vertically raised in FIG. 1). In other words,
The left and right connecting punches 46, 72 of the left and right frames 4, 5 are extended toward the center side from both side ends of the central working portion 3 by the height of the working portions 3, 6, 7. The main punches 14 and 15 and the left and right connecting punches are formed so as to have a length substantially equal to the height of the working portions 3, 6, and 7 and to be offset toward the center by the height of the working portions. 46 and 72 are abutted, and are rotatably connected by a pivot pin 26 provided above the joint position. Further, in the present embodiment, the left and right frames 4 and 5 are deployed and moved by 90 degrees or more (110 to 115 degrees), and the outer ends of the left and right working units 6 and 7 (rotation of the tips of the working claws 41) at that time. The trajectory P) does not protrude from both end positions (B) of the central working unit 3. That is,
The offset position of the support pin 26 is determined so that the width W of the central working unit 3 becomes the machine width in the substantially folded posture, and the main punches 14 and 15 and the left and right connecting punches 46 and 47 are accordingly determined.
Is set.

Next, the rotary drive system of the harrow 1
4, the input shaft 11 is connected to the bevel gears 9, 1
The first output shaft 12 is connected to the second output shaft 55 by the transmission 8 and the first output shaft 12 is connected to the left output shaft 12 by the transmission device 8. The first output shaft 12 and the second output shaft 55 are connected by a first clutch mechanism 121, and the working shafts 70, 40, and 75 are connected by a second clutch mechanism 122 and a third clutch mechanism (not shown). They are joined and separated.

As shown in FIG. 4, the input shaft 11 is supported at both ends in a transmission 13 by two bearings 11a and 11b, and its bevel gear 9 is mounted near one bearing 11b. The first output shaft 12 is the left main rod 1
4 is supported by bearings 23 provided at both ends of the input shaft 11, one end of which is inserted into the transmission 13.
A bevel gear 10 that meshes with the bevel gear 9 is mounted. The other end of the first output shaft 12 protrudes inward from the connecting member 16, and a pawl clutch member 25 serving as the first clutch mechanism 121 is spline-connected. The second output shaft 55 is supported by bearings 54 provided at both ends of the left connecting rod 46, and one end protrudes inward of the connecting member 47 and engages with the pawl clutch member 25 of the first output shaft 12. 5
6 are spline-connected so as to be slidable in the axial direction. A compression spring 60 is provided between the base end of the claw clutch member 56 and the bearing 54, and urges the claw clutch member 56 in a protruding direction. A retaining plate 61 for retaining the pawl clutch member 56 is attached to a shaft end surface of one end of the second output shaft 55. The other end of the second output shaft 55 projects from the left connecting rod 46, and a sprocket 57 serving as the transmission 8 is attached.

The left working shaft 70 includes a left plate 49 attached to the flange 48 of the left connecting rod 46 and a clutch case 67 suspended by a support plate 63 attached to the bracket 53 of the left connecting rod 46. Bearing 69, 36 respectively
Are supported at both ends. One end of the left working shaft 70 is connected to the sprocket 57 of the second output shaft 55 by the chain 5.
A sprocket 71 connected by 8 is attached.
The sprockets 57, 71 and the chain 58 are hermetically covered by a chain case 59 attached to the left side plate 49. A claw clutch member 68 serving as a second clutch mechanism 122 is attached to the other end of the left working shaft 70 by spline coupling, and is pivotally supported inside the clutch case 67. The central working shaft 40 has clutch members 39 attached to both ends by spline coupling (the right side is not shown), and is supported by a clutch case 98 via bearings 37. The clutch case 98 is supported by two auxiliary rods 32 arranged below the main rods 14 and 15.
The main rods 14 and 15 and the auxiliary rod 32 are connected by a suspension plate 43 attached to the lower end of the connecting member 16. The auxiliary rod 32 and the clutch case 98 are connected by support plates 35 provided at both ends of the auxiliary rod 32.

Similarly to the left working shaft 70, one end of the right working shaft 75 is attached to the right connecting rod 72 by the bracket 53 and the support plate 6.
3. The shaft is supported via a clutch case (not shown), and the other end is supported by a bearing 74 on a right side plate 73 attached to a flange 48 of the right connecting rod 72. Then, the clutch member is similar to the clutch member 68 of the second clutch mechanism 122 so as to be brought into contact with and separated from the other end of the central working shaft 40. Note that connecting plates extending in the front-rear direction are provided on the inner surfaces of the left plate 49 and the support plate 63 facing each other across the working shafts 70, 40, and 75, and between the support plates 35, and between the support plate 63 and the right plate 73, respectively. 65, 64, 33, and 34 are attached in a superimposed manner, and support covers 42, 66, and 95 that cover the upper portions of the working claws 41 of the working sections 3, 6, and 7, respectively. Flattened plates 45, 97, and 96 are rotatably supported at the rear lower ends of the covers 42, 66, and 65 by a shaft 44.

Next, frame expanding means for expanding and moving the left and right frames 4 and 5 will be described. As shown in FIG. 1, the frame expanding means includes a left frame 4 and a main frame 2
, And between the main frame 2 and the right frame 5, an engaging member 51 and a mounting bracket 52 provided in a symmetrical structure and attached to the left and right connecting rods 46 and 72, respectively.
Locking members 18, 19 attached to main rods 14, 15
And the tension spring 30 stretched between the mounting bracket 52 and the locking members 18 and 19. The engaging member 51 is formed of a plate erected on the left and right connecting rods 46, 72, and is provided at a position where it engages with the locking members 18, 19 when the left and right frames 4, 5 are folded. A locking pin 50 extending in the traveling direction F
Is attached. The mounting bracket 52 includes the engaging member 51.
The right and left connecting rods 6, 72, which are provided at the upper end of the right and left connecting rods 46, 72 at the substantially middle position, and which are provided at the upper end thereof.
2 supports one end of the tension spring 30. The locking members 18 and 19 are formed of plates erected near both outer ends of the main rods 14 and 15, are provided with a support pin 31 for supporting the other end of the tension spring 30, and are appropriately bent at the top. As a result, a groove 27 opening diagonally upward is formed. That is, the locking pin 50 of the engaging member 51 is fitted in the groove 27. And the locking members 18, 19
A hook 29 having a hook-like end whose tip is opposed to the groove 27 is rotatably provided at the upper part of the groove. The locking pin 50 is attached to the groove 27 by the pulling force of the small spring 28 provided at the other end. It guides the entry and restrains the locking pin 50 fitted in the groove 27.

Next, referring to FIG. 5 and FIG.
A fixing device 76 for fixing the members 4 and 5 in a straight line will be described. Since the same fixing device 76 is provided on the left and right, only the left frame 4 will be described here. The fixing device 76 is provided on the left frame 4 with an engaging body 77 attached to the front of the central cover body 42, an engaging bracket 78 provided on the rear side, a lever member 79 pivotally supported by the engaging body 77. Channel member 80, a hook 81 and a bell crank 82 supported by the channel member 80, and a connecting rod 83 for connecting these.
And a traction rod 84 for engaging and disengaging the lever member 79 and the channel member 80.

The engaging body 77 is formed into a box shape by a small plate, and a part of the upper plate 86 and two front and left side surfaces are opened. The lower plate 85 is fixed in a state where the vertical side plate 85 a extends downward and abuts on the upper surface of the central cover body 42. The lever member 79 includes a protruding shaft 8 serving as a pivot shaft.
The lever bracket 87 includes a lever bracket 87 having a U-shaped side cross section formed by extending the upper and lower parts 7a and 87b, and a handle 88 that is appropriately bent and connected from the base end of the lever bracket 87. The projecting shaft 87a protruding upward is locked by a hook-like groove 86b formed in an opening 86a of the upper plate 86, and is inserted into a through hole 94a of a fixed plate 94 attached to the upper surface of the upper plate 86. I have. The projecting shaft 87 b projecting downward is inserted into a through hole 85 c formed in the lower plate 85. A pivot shaft 90 penetrating in the vertical direction is supported by the lever bracket 87 so as to be rotatable around its axis.
The proximal end of the towing rod 84 is attached. The distal end side of the towing rod 84 is formed by a notched portion 80 of the channel member 80.
a, and a contact piece 89 is screwed to an end thereof so that the position can be adjusted.

The channel member 80 is attached to the bracket 53 of the left connecting rod 46, and has a bell crank 82
A support shaft 91 for supporting the hook 81 is provided at the rear. At the front end of the channel member 80 and the bell crank 82, the contact piece 8 of the traction rod 84 is provided.
The recesses 80b and 82a that engage with No. 9 are formed coaxially. That is, when the handle 88 of the lever member 79 is positioned to extend forward, the contact piece 8 of the tow rod 84
9 is locked to the channel member 80 to restrain the bell crank 82, and the lever member 79 in the figure is pivoted to the shafts (87a, 8a).
7b) When it is rotated around in the counterclockwise direction in the drawing, the pivot shaft 90 rotates and the contact piece 89 of the towing rod 84 moves.
The contact between the recesses 80b and 82a is loosened. The connecting rod 83 is formed so as to be adjustable in length, and both ends are respectively supported by the other end of the bell crank 82 and the base end of the hook 81 so as to extend along the traveling direction F. A shaft 93 that engages with the hook groove 81 a at the tip of the hook 81 is provided upright on the engagement bracket 78. Accordingly, when the bell crank 82 is restrained by the towing rod 84, the tip of the hook 81 is locked by the engagement bracket 78, and the towing rod 84 releases the restraining of the bell crank 82 to rotate the pivot shaft 9.
When the main frame 2 and the left frame 4 are pivoted forward (center side) around 0, the bell crank 82 and the hook 81 become free and rotate counterclockwise, respectively. Will be crushed. In addition, between the lower ends of the leveling plates 45, 97, and 96, an engaging member 99 for maintaining an appropriate distance that does not intersect with each other when fixed by the fixing device 76 is bridged.

Next, the operation of this embodiment will be described.

When performing work in a paddy field or the like, the left and right frames 4 and 5 are extended in the machine width direction to be aligned with the main frame 2, and the lever member 79 of the fixing device 76 is rotated forward to perform a normal operation. Fix to working posture. At this time, the clutch members 25, 56, 68,
Reference numeral 39 indicates a state in which the claws 24 and 38 are engaged with each other. Particularly, in the first clutch mechanism 121, the pawls 24 of the pawl clutch members 25 and 56 partially come into contact with each other in the radial direction because the pawls 24 are located near the pivot point (the pivot pin 26). Since the pawl clutch member 56 of the second output shaft 55 slides in the axial direction against the urging force of the compression spring 60, there is no hindrance to clutch connection. When the clutch connection is confirmed, the top stay 22 and the lower arms 20 and 21 are connected to the tractor three-point link and the like, and the input shaft 11 is connected to the tractor drive shaft (not shown).
Connect to Thus, the rotational driving force is transmitted from the input shaft 11 to the left working shaft 70 via the bevel gears 9 and 10, the first and second output shafts 12 and 55, and the transmission 8, and the second clutch mechanism 122 performs central working. The work claw 41 is also transmitted to the shaft 40 and the right work shaft 75 at the same time, and the work claw 41 is driven to turn, so that the tractor travels and performs crushing and digging.

When the halo 1 is transported by a tractor or stored in a warehouse or the like, the lever member 79 of the fixing device 76 is rotated counterclockwise, and the contact piece 89 of the towing rod 84 and the bell crank 82 and After the contact with the channel member 80 is released, the towing rod 84 is rotated about 90 degrees around the axis of the pivot shaft 90 and positioned at the center. Then, the bell crank 82 is rotated around the shaft 91 to release the engagement between the hook 81 and the shaft 93. Next, using the urging force of the tension spring 30, the left and right frames 4, 5 are expanded upward around the support pin 26, and folded toward the center. Then, the locking pin 50 of the engaging member 51 is fitted into the groove 27 of the locking members 18 and 19, and
And the left and right frames 4 and 5 are fixed to the main frame 2. As a result, the working units 6 and 7 are held obliquely upward and rearward without protruding from the axis B vertically raised from both side ends of the central working unit 6.

As described above, the pivot pin 26 is connected to the central working portion 3.
Are positioned closer to the center than both side ends (B) of the left and right sides, the weight occupied by the working portions 6, 7 of the entire left and right frames 4, 5 to be deployed is reduced, and the center of gravity in the folded posture is positioned relatively below. Therefore, it is possible to suppress the impairment of maneuverability and stability when the vehicle is transported by the tractor. In other words, it is possible to achieve both the reduction in the machine width and the assurance of maneuverability and stability. Left and right frames 4, 5
The power to raise the power can also be reduced. That is, as in the present embodiment, folding can be easily performed by using the force of the tension spring 30. Further, in this embodiment, the tension spring 3
0, the locking members 18 and 19 and the engaging member 51 are provided so as to be automatically fixed in accordance with the unfolding movement, so that the folded left and right frames 4 and 5 can be easily hooked onto the main frame 2. Can be.

Further, between the output shafts 12 and 55 and the work shafts 70 and
The clutch mechanisms 121 and 122 are provided between the first and second working shafts 40 and 75, and the second output shaft 55 and the left working shaft 7 at the left end of the body.
Since the transmission 8 is provided at a position between 0 and 0 to transmit the rotational driving force, only the left end of the entire width of the body becomes a portion where no work is performed, and residual tillage which is difficult to re-till occurs. Absent. For example, when cultivating a furrow on a furrow, by plowing the right working unit 7 so as to contact the side surface of the furrow, a complete work without residual tillage can be performed. Since the support pin 26 is slightly inclined from the horizontal and the left and right frames 4 and 5 are deployed obliquely rearward, the movement of the center of gravity in the front-rear direction is minimized, and the connection with the power side (tractor) is reduced. Interference can be avoided. Furthermore, since the left and right working parts 6 and 7 are formed so as to be located inward from both side ends (B) of the central working part 3 when deployed diagonally rearward, the machine width when folded is limited to the central working part 3. , The size of the entire body is effectively reduced, and the dead space at the time of storage is reduced. Further, since the fixing device 76 is provided between the main frame 2 and the left and right frames 4 and 5, the working units 3, 6, and 7 can surely maintain a working posture in which they are aligned in a straight line.

Further, in the fixing device 76 of this embodiment, the frames 2, 4, 5 are fastened at two places separated in the front-rear direction by the towing rod 84 and the hook 81, and the fastening is released by operating the lever member 79. As a result, the working posture can be firmly fixed, and the switching to the folding posture can be easily performed.

In the present embodiment, the transmission 8 is provided on the left side and the rotational driving force is transmitted via the left connecting rod 46. However, the transmission may be provided on the right side. Of course it does not matter. In the present embodiment, the case where the present invention is applied to a harrow is shown. However, the present invention is widely applied to a farming machine having a similar structure, for example, a tilling machine.

[0027]

In summary, according to the present invention, the following excellent effects are exhibited.

(1) According to the configuration of the first aspect, the movement of the center of gravity at the time of folding is reduced, so that a decrease in maneuverability and stability can be prevented.

(2) According to the configuration of the second aspect, a portion of the entire machine width where no work is performed is limited to one side end, and complete work without remaining tillage is achieved.

(3) According to the third aspect of the present invention, the left and right working parts are deployed obliquely rearward, so that excessive center-of-gravity movement in the front-rear direction and interference with the front power side can be avoided.

(4) According to the configuration of the fourth aspect, the machine width when folded is determined by the width of the central working unit, and the machine width can be effectively reduced.

(5) According to the configuration of the fifth aspect, it is possible to reliably maintain the posture in which the respective working units are aligned in a straight line.

[Brief description of the drawings]

FIG. 1 is a rear view showing an embodiment of an agricultural working machine according to the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a partial cross-sectional view for explaining the rotary drive system of FIG.

FIG. 4 is a detailed view of a main part of FIG. 3;

FIG. 5 is a plan view showing the fixing device of FIG. 1;

FIG. 6 is a side sectional view for explaining a main part of FIG. 5;

FIG. 7 is a rear view showing a conventional agricultural working machine.

[Explanation of symbols]

 3 Central Working Machine 4 Left Frame 5 Right Frame 6 Left Working Unit 7 Right Working Unit 8 Transmission (Transmission Mechanism) 26 Support Pin (Pivot) 40 Central Working Axis 70 Left Working Axis 75 Right Working Axis 76 Fixing Device 122 Second B. Clutch mechanism (clutch mechanism)

Continuation of the front page (56) References JP-A 2-148215 (JP, U) JP-A 63-50508 (JP, U) JP-A 1-5450 (JP, Y2)

Claims (5)

(57) [Claims] 1. A left and right working part is connected to both sides of a central working part in the machine width direction so as to be linear in the width direction to the central working part.
And, and the left and right working unit, in agricultural machine which is provided foldably upward, the upper part of the central working portion, therein
A main punch is provided to support the central working part, forming a main frame,
Left and right connection supporting the left and right working parts at the top of the left and right working parts
The left and right frames are formed by providing punches,
When the left and right connecting punches are formed to extend to the
The center working part is connected to the end of the left and right connecting punches.
The main punch is formed shorter than the width of the
A pivot is provided on the upper part of the joint of
Agricultural work machine characterized in that the above is rotatably connected upward . Wherein each working portion having a working axis, the work
Power is transmitted to the shaft by the output shaft that is inserted from the main punch into the connecting punch.
The agricultural machine according to claim 1, which is achieved . 3. The agricultural working machine according to claim 1, wherein the pivot is formed to be slightly inclined from horizontal so that the left and right frames are developed obliquely rearward and folded. 4. When the left and right frames are unfolded obliquely rearward and folded, the left and right working parts are folded.
The left and right connecting punches fit so that they fit within the width of the central working part.
4. The agricultural working machine according to claim 3, wherein the position of the pivot connecting the main frame and the main frame is determined . 5. The method according to claim 5 , wherein each of the main frame and the left and right frames is
The agricultural working machine according to any one of claims 1 to 4, further comprising a fixing device for fixing the working unit to a posture aligned in a straight line in the machine width direction .