JPH08256504A - Rotary tiller-covering device - Google Patents

Abstract

PURPOSE: To enable the replacement of a part for rotatably connecting the rear cover to the top cover and reduce the bolts needed for fixing. CONSTITUTION: In this rotary tiller cover, the mounting plate 14 equipped with the upper wall part 14a and the rear wall part 14b extended downward from the rear edge of the upper wall, part 14a is fixed on the rear upper face of the upper cover 11. Further, the supporting plate 15 is equipped with the lateral plate 15a bolt-fixed to on the upper wall part 14a of this mounting plate 14 and with the vertical plate 15b overlapped on the rear wall part 14b of the mounting plate 14 extended downward from the rear edge of the lateral plate 15a. The bearing 18 through which the supporting shaft 19 is detachably passed is mounted on the rear face of the vertical plate 15b of this supporting plate 15. The presser 20 formed by folding the rear edge of the upper cover 11 upward is connected to the bottom edge of the vertical plate 15b and the supporting shaft 19 is fixed to the mounting plate 21 fixed to the top edge of the rear cover 12 with bolts.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary tillage cover device.

[0002]

2. Description of the Related Art As a device for cultivating a field, there is a rotary attached to the rear part of a tractor via a three-point link.
This rotary is usually provided with a rotary cover for covering the cultivating part, and the rotary cover includes an upper cover for covering the upper part of the cultivating part and a rear cover for covering the rear of the cultivating part, and the rear cover has its upper end. The side is connected to the rear end side of the upper cover so as to be swingable around the horizontal axis.

A support shaft extending in the left-right direction is welded and fixed to the upper end side of the rear cover, and both left and right ends and an intermediate portion of the support shaft are supported by a receiving part fixed to the rear end side of the upper cover as an insertion shape. By doing so, the rear cover is swingably connected to the upper cover.

[0004]

In the above-mentioned conventional one, since the rear cover frequently oscillates up and down following the unevenness of the field at the time of tilling, the pivot portion is easily worn.
Since the support shaft and the receiving part cannot be replaced if they are fixed by welding, it is possible to replace easily worn parts such as the support shaft and the receiving part. And a rear plate extending downwardly from the rear end of the upper wall, fixing a mounting plate, and a horizontal plate part superposed on the upper wall of the mounting plate and the horizontal plate. The support plate, which has a vertical plate portion that extends downward from the rear end of the mounting portion and overlaps with the rear wall portion of the mounting plate, is bolted to the mounting plate, and a horizontal shaft is inserted through the supporting plate. It is considered that a supportable bearing portion is provided and the supporting shaft is fixed to a mounting member that is bolted to the upper end side of the rear cover.

However, in order to fix the support plate, it is necessary to fix the horizontal plate portion and the vertical plate portion, which causes a new problem that the number of bolts increases. Therefore, in view of the above problems, the present invention provides a rotary tillage cover device capable of exchanging parts of a pivotal support connecting portion of a rear cover with respect to an upper cover and further reducing the number of mounting bolts. With the goal.

[0006]

The technical means taken by the present invention to achieve the above-mentioned object are an upper cover 11 for covering the upper part of the rotary tiller 9 and a rear cover 12 for covering the rear of the rotary tiller 9. And a rear cover 12
The upper end side of the upper cover 11 to the rear end side of the upper cover 11 in the left-right direction
In a rotary tillage cover device that is swingably connected via 9, an upper wall portion 14a on the rear upper surface side of the upper cover 11 and a rear wall extending downward from the rear end of the upper wall portion 14a. Fixing the mounting plate 14 including the portion 14b,
A horizontal plate portion 15a fixed to the upper wall portion 14a of the mounting plate 14 by bolts, and a vertical plate extending downward from the rear end of the horizontal plate portion 15a and superposed on the rear wall portion 14b of the mounting plate 14. Part 1
5b, and a supporting plate 15 including
A bearing portion 18 into which the support shaft 19 can be inserted and removed is provided on the rear surface side of the vertical plate portion 15b, and the rear end side of the upper cover 11 is bent upward at the lower end side of the vertical plate portion 15b. It is in the point that the support shaft 19 is fixed to the mounting member 21 which is bolted to the upper end side of the rear cover 12 by engaging the holding portion 20 formed by the above.

[0007]

In order to replace the support shaft 19, the bolt for fixing the mounting plate 21 to which the support shaft 19 is fixed is removed, and the mounting plate 21 is removed.
Is moved in the left-right direction, and the support shaft 19 is pulled out from the bearing portion 18. Further, in order to replace the support plate 15, the bolts that fix the support plate 15 may be removed.

The vertical plate portion 15b is fixed by engaging the pressing portion 20 formed by bending the rear end side of the upper cover 11 upward with the lower end side of the vertical plate portion 15b of the support plate 15, The number of bolts for fixing the vertical plate portion 15b can be reduced, and the strength of the upper cover 11 itself can be increased.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. 2 and 3, reference numeral 1 denotes a side drive type rotary that is mounted on the rear portion of the tractor via a three-point link.
And the chain case 4 is fixed to the outer end of the left support arm 3 and the side frame 5 is fixed to the outer end of the right support arm 3.
Is formed in a gate shape.

A pawl shaft 7 is rotatably installed around the lower part of the chain case 4 and the side frame 5 around a shaft center in the left-right direction. A part 9 is configured, and the rotary tilling part 9 is covered with a tilling cover 10. Tillage cover 10
Is an upper cover 11 that covers the upper part of the rotary tiller 9,
A rear cover 12 that covers the rear of the rotary tiller 9 is provided.

The upper cover 11 is formed by curving a plate material formed in the left-right direction of the rotary tiller 9 along the outer peripheral locus of the tiller claw 8 and at the same time, the rotary machine frame 6
It is attached and fixed to. Side plates 13 are welded and fixed to both left and right sides of the upper cover 11, and a mounting plate 14 also has a function as a reinforcing plate on the upper surface side rear portion of the upper cover 11.
Are fixed by welding.

As shown in FIGS. 1 and 3 to 5,
The mounting plate 14 is formed across the left-right direction of the upper cover 11, and includes an upper wall portion 14a and a rear wall portion 14b extending downward from a rear end portion of the upper wall portion 14a. . Support plates 15 are attached to the mounting plate 14 at a plurality of positions in the left-right direction (four positions in the illustrated example). Each support plate 15 is L-shaped so as to match the rear corner of the mounting plate 14.
The upper wall portion 14a of the mounting plate 14 is formed in a bent shape.
And a vertical plate portion 15b extending downward from the rear end of the horizontal plate member 15a and superposed on the rear wall portion 14b of the mounting plate 14, the rear portion of the mounting plate 14 The lateral plate portion 15a is superposed on the outer surface and is detachably attached and fixed to the upper wall portion 14a of the mounting plate 14 by a pair of left and right bolts 16 and nuts 17.

On the rear surface of the vertical plate portion 15b of each support plate 15,
A bearing portion 18 formed by bending a plate material into a U shape so that the support shaft 19 can be inserted in the left-right direction is welded and fixed. Further, the rear end side of the upper cover 11 is bent upward, and this bent portion is the vertical plate portion 15 b of the support member 15.
The holding plate 20 is engaged with the lower end of the vertical plate 15b, and the holding plate 20 and the rear wall 14b of the mounting plate 14 sandwich the vertical plate 15b, whereby the vertical plate 15b is fixed.
The bolts and nuts for fixing the vertical plate portion 15b are omitted.

In order to remove the support plate 15, the bolt 1
6. The fastening by the nut 17 is released, the support plate 15 is moved upward, and the lower end portion of the vertical plate portion 15b is pulled out from between the pressing portion 20 and the rear wall portion 14b of the mounting plate 14. Further, the strength of the upper cover 11 itself can be increased by the pressing portion 20, and the soil discharged from the rotary tiller 9 collides with the upper cover 11 so that the pressing portion 20 engages with the vertical plate portion 15b. Transforms so that it becomes stronger.

The rear cover 12 has its upper end side attached to the rear end side of the upper cover 11 via a support shaft 19 inserted in the bearing portion 18 of the support plate 15 so as to be rotatable about its axial center in the left-right direction. ing. That is, on the upper end side of the rear cover 12, a pair of left and right mounting members 21 and 22 positioned on both the left and right sides of each support plate 15 are provided.
Is formed by bending a plate material so as to form cylindrical portions 21a and 22a through which the support shaft 19 can be inserted, and the end portions are superposed on each other. This superposed portion is the upper end side of the rear cover 12. It is detachably attached and fixed to the lower surface by bolts 23 and nuts 24. Further, the support shaft 19 has one mounting plate 21
It is fixed by welding.

In the above structure, in order to remove the rear cover 12 from the upper cover 11, first, a bolt 23 and a nut 24 for fixing one mounting plate 21 to which the support shaft 19 is fixed.
Remove. Next, the one mounting plate 21 is moved in the left-right direction to move the support shaft 19 into the tubular portion 22a of the other mounting plate 22.
The rear cover 12 is removed by removing it from the bearing portion 18.

In the chain case 4, there is housed a chain winding transmission mechanism for transmitting power from the PTO shaft of the tractor to the pawl shaft 7 to drive the pawl shaft 7 for rotation. As shown in FIG. 6, a bearing holder 25 penetrating the inner wall 4a of the chain case 4 is attached to the lower end side of the inner wall 4a of the chain case 4. A bearing 26 is fitted in the bearing holder 25 and The drive shaft 27 is inserted and supported. A flange 28 is formed on the right end side of the drive shaft 27, and the pawl shaft 7 is bolted to the flange 28.

The left end side of the drive shaft 27 is inserted into the chain case 4, and the sprocket 29 of the chain winding transmission mechanism is spline-fitted to the sprocket 2.
9 is retained by the retaining member 30, and the retaining member 3
No. 0 penetrates the retaining member 30 and is fixed to the drive shaft 27 by a bolt 32 screwed into a screw hole 31 formed in the drive shaft 27.

The bearing holder 25 and the flange 2 of the drive shaft 27
A mechanical seal 33 is provided on the inner peripheral side between the bearings 8 and 8 to prevent dust from entering the bearings 26. The elastic ring 34a of the fixed ring 34 of the mechanical seal 33 elastically contacts the bearing holder 25, and
The elastic ring 34a of No. 5 elastically abuts the flange 28, and the fixed ring 34 and the rotary ring 35 are pressed against each other so that these joints are in close contact with each other.

A labyrinth structure 36 is formed by the bearing holder 25 and the flange 28 of the drive shaft 27 on the outer peripheral side of the mechanical seal 33, and a dust cover 37 is provided on the outer periphery of the labyrinth structure 36. An opening 38 for attaching the retaining member 30 and the bolt 32 is formed in the lower portion of the outer wall 4b of the chain case 4, and the opening 38 is closed by a cap 39. A protective cover 40 is provided below the outer wall 4b of the chain case 4.

In the bearing structure of the pawl shaft 7 having the above-described structure, a mounting jig 41 is used to mount the drive shaft 27 as shown in FIG. 7. The jig 41 includes a bearing 42 and a hexagon nut. It is composed of a main body 44 having a portion 43 and a mounting bolt 45. To mount the drive shaft 27, the drive shaft 27 is inserted into the chain case 4 so that the tip of the drive shaft 27 slightly projects from the bearing 26, the sprocket 29 is spline-fitted to the projecting portion, and the bearing of the jig body 44 is mounted. Abut 42 on sprocket 29.

Then, the bolt 45 is screwed into the hexagonal nut portion 43 and the jig body 44, and the bolt 34 is screwed into the screw hole 31 of the drive shaft 27. And the bolt 34
While holding the head of No. 4 with a tool or the like so as not to rotate relative to each other, the hexagon nut portion 43 is rotated clockwise (screw-in direction). Then, the bolt 34 moves to the left, the drive shaft 27 moves to the left, the drive shaft 27 is inserted into the bearing 26 and the sprocket 29, and the fixed ring 34 and the rotary ring 35 of the mechanical seal 33 are mutually moved. Is closely related to.

As shown in FIG. 2, on the upper side of the rotary cover 10, a pair of right and left lowering devices 46 that straddle the upper cover 11 and the rear cover 12 are provided. The lowering device 46 has a lowering rod 47, and the lowering rod 47
The front end portion of the is pivotally attached to the support arm 3 so as to be rotatable about the left and right axes, and the rear portion is inserted into the receiving member 48 so as to be movable in the axial direction, and is retained by a retaining ring. A compression coil spring 49 is fitted over the lower rod 47, the rear end of the coil spring 49 contacts the receiving member, and the front end of the compression spring 49 is a stopper 50.
I am working on

As shown in FIG. 8, the receiving member 48 is rotatably supported by a bracket 51 which is erected on the rear surface of the rear cover 12 so as to be rotatable about the left and right axes. The projecting portion 52 of the
A storage recess 53 orthogonal to 7 is formed from below.
A lock pin 54 and the lock pin 54 are provided above the lower rod 47 of the storage recess 53.
And a spring 55 that urges the spring toward.

The lock pin 54 is composed of a lower head portion 54a and an upper shaft portion 54b, and the head portion 54a is formed in a cylindrical shape having an inclined guide surface 56 on the front surface side of the lower portion, and is a lower rod. It can be freely inserted into and removed from an engagement hole 57 formed at an upper portion of 47 at an appropriate interval in the axial direction. The shaft portion 54b projects upward from the projecting portion 52, and the operating lever 58 is attached to the projecting portion via a pin 59 so as to be rotatable about the left and right axes. The operating lever 58 is formed in a U-shaped cross section from the left and right side walls 58a and the connecting wall 58b, and the left and right side walls 58a sandwich the protruding portion 52 of the receiving member 48 to restrict the rotation around the shaft portion 54b. There is.

As shown by the solid line in FIG. 8, when the operating lever 58 is in the upright state, the head portion 54a of the lock pin 54 is inserted into the engagement hole 57, and in FIG. As shown, in the state where the operation lever 58 is rotated around the pin 59 and laid down, the lock pin 54 is pulled up, and the head portion 54 a is disengaged from the engagement hole 57. Further, when the operating lever 58 is laid down, the equalizing pressure is applied to the rear cover 12 by the urging force of the coil spring 49 at the time of plowing. Further, in the state where the operation lever 58 is erected, the lowering of the rear cover 12 can be regulated when the plowing claws 8 are replaced, the maintenance is performed, or the field is roughened. At this time, in the upward movement of the rear cover 12, the lock pin 54 is guided by the guiding action of the guide surface 56.
The head portion 54a of the lower part of the rod 47 is disengaged from the engaging hole 57.
Climb up and head 5 of the lock pin 54 at an appropriate height.
By inserting 4a into the engagement hole 57, the rear cover 12
Can be locked and held in an appropriate raised position.

Further, when it is desired to restrict the upward movement of the rear cover 12, the operating lever 58 is pulled up so as to be separated from the protruding portion 52 and the shaft portion 54b of the lock pin 54 is drawn, as shown by a phantom line in FIG. 90 degrees around, and then, as shown by the solid line in FIG.
It suffices to lower it so that the protruding portion 52 is sandwiched by 8a. As shown in FIG. 10, the stopper 50 has a cylindrical holder 60 that is fitted onto the lower rod 47 so as to be slidable in the axial direction. A holder hole 61 is formed through the holder 60. 61
A ball 63 is housed in the lower rod 47, which engages with a circumferential groove 62 having an arcuate cross section formed at an appropriate interval in the axial direction.

Spring holders 64 are provided at both ends of the holder 60, an operating body 65 is provided between the spring receiving bodies 64, and the operating body 65 is provided between the operating body 65 and the spring receiving body 64. It is held at an intermediate position by a spring 66 provided, and presses the ball 63 at this position to prevent the ball 63 from coming off the peripheral groove 63. Then, the operating body 65
By moving the ball 6 against the urging force,
3 is allowed to be removed from the circumferential groove 63, and the position of the stopper 50 can be changed.

Further, the depth of the circumferential groove 62 is formed to be the maximum or less than the radius of the ball 63 so that the ball 63 is not easily separated due to vibration.

[0030]

According to the present invention, the upper wall of the upper cover 11 is provided with the upper wall portion 14a and the rear wall portion 14b extending downward from the rear end of the upper wall portion 14a. A horizontal plate portion 15a that fixes the mounting plate 14 and is bolted onto the upper wall portion 14a of the mounting plate 14, and a rear wall portion of the mounting plate 14 that extends downward from the rear end of the horizontal plate portion 15a. A support plate 15 having a vertical plate portion 15b superimposed on 14b,
The supporting shaft 19 is provided on the rear surface side of the vertical plate portion 15b of the support plate 15.
Is provided with a bearing portion 18 that can be inserted and removed freely, and a holding portion 20 formed by bending the rear end side of the upper cover 11 upward is engaged with the lower end side of the vertical plate portion 15b to form a rear cover. 1
Since the support shaft 19 is fixed to the mounting member 21 which is bolted to the upper end side of 2, the wear-prone parts of the pivot support connecting portion of the rear cover with respect to the upper cover can be replaced.
Moreover, since the pressing portion 20 formed by bending the rear end side of the upper cover 11 upward is engaged with the lower end side of the vertical plate portion 15b of the support plate 15, the number of bolts for mounting the vertical plate portion 15b is reduced. At the same time, the strength of the upper cover 11 itself can be increased.

[Brief description of drawings]

1 is a cross-sectional view taken along the line AA of FIG.

FIG. 2 is a side view of a rotary.

FIG. 3 is a rear view of the rotary.

FIG. 4 is a rear view showing a mounting portion of a rear cover.

5 is a sectional view taken along the line BB of FIG.

FIG. 6 is a rear cross-sectional view showing a support structure for a pawl shaft.

FIG. 7 is a rear sectional view showing the attachment of the drive shaft of the pawl shaft.

FIG. 8 is a side sectional view showing a part of the lowering device.

FIG. 9 is a side sectional view showing a part of the lowering device.

FIG. 10 is a side sectional view showing a part of the lowering device.

[Explanation of symbols]

 9 rotary tillage part 11 upper cover 12 rear cover 14 mounting plate 14a upper wall part 14b rear wall part 15 support plate 15a horizontal plate part 15b vertical plate part 18 bearing part 19 spindle 20 presser part 21 mounting member

Claims (1)

[Claims] 1. A rear cover (1) comprising an upper cover (11) covering the upper part of the rotary tillage part (9) and a rear cover (12) covering the rear part of the rotary tillage part (9).
A rotary tillage cover device in which the upper end side of 2) is swingably connected to the rear end side of the upper cover (11) via a support shaft (19) in the left-right direction, wherein the rear upper surface side of the upper cover (11) The upper wall (14
a) and a rear wall portion (14b) extending downward from the rear end of the upper wall portion (14a) are fixed to the mounting plate (14), and the upper wall of the mounting plate (14) is fixed. The horizontal plate portion (15a) fixed to the portion (14a) by bolts, and the horizontal plate portion (15a).
a) a support plate (15) comprising a vertical plate part (15b) extending downward from the rear end and superposed on the rear wall part (14b) of the mounting plate (14); On the rear surface side of the vertical plate portion (15b) of (15), a bearing portion (18) into which the support shaft (19) can be inserted and removed is provided, and the vertical plate portion (1) is provided.
5b) A lower end side of the upper cover (11) is engaged with a holding portion (20) formed by bending a rear end side of the upper cover upward, and an attachment member is bolted to an upper end side of the rear cover (12). (2
1) The support shaft (19) is fixed to the rotary tillage cover device.