JP5675429B2 - Cover device for rotary tiller - Google Patents

Description

  The present invention relates to a cover device for a rotary tiller that covers an upper portion of a rotary tiller.

The cover device of the rotary tiller connected to the rear part of the tractor has a main cover that covers the upper part of the rotary tiller between the pair of left and right end members, and an elastic cover is arranged on the lower surface side of the main cover There is.
In this type of conventional rotary tiller cover device, the front end side and the rear end side of the pair of left and right end members are connected by front and rear connecting frame members to form a rectangular frame, and the upper surface of the frame On the side, an upper plate is provided so as to close the opening of the frame body, and an elastic cover is provided on the lower surface side of the frame body so as to close the opening of the frame body. There is what was supported by.

JP 2007-124959 A

In the conventional case, the constituent material of the main cover of the cover device is mainly a welded component such as a sheet metal, a pipe, etc., which increases the weight, increases the number of parts, increases the number of welding points, and increases the cost.
In view of the above problems, an object of the present invention is to provide a cover device for a rotary tiller that can be reduced in weight by extrusion molding with an aluminum alloy and can be manufactured at low cost with a small number of parts.

In order to achieve the above object in the present invention, in claim 1, a main cover 34 covering the upper side of the rotary tiller 5 is provided between the pair of left and right end members 37, and the rear end edge of the main cover 34 is rearward. A rotary tiller cover device in which a cover 35 is attached so as to be swingable up and down,
The main cover 34 connects the upper and lower walls 45, 46, the front and rear walls 47, 48, and the upper and lower walls 45, 46, and is disposed parallel to the rotation center line of the rotary tiller 5 across the left and right direction of the main cover 34. A plurality of connecting ribs 49, which are integrally formed by extrusion molding with an aluminum alloy ,
Inside the main cover 34, the upper and lower walls 45, 46, front and rear walls 47, 48, and a plurality of connection ribs 49, a side view triangular cavity 51 is alternately and continuously connected to the plurality of connection ribs 49. It is in a formed point.

In claim 2, a plurality of cavities 51 having a triangular shape in a side view between upper and lower walls 45, 46 of the main cover 34 are filled with a damping material or a foamed resin 53 having a triangular shape in a side view. .
In Claim 3, the main cover 34 which covers the upper part of the rotary tilling part 5 is provided between the pair of left and right end members 37, and the rear cover 35 is attached to the rear end edge of the main cover 34 so as to be swingable up and down. A rotary tiller cover device,
The main cover 34 connects the upper and lower walls 45, 46, the front and rear walls 47, 48, and the upper and lower walls 45, 46, and is disposed parallel to the rotation center line of the rotary tiller 5 across the left and right direction of the main cover 34. A plurality of connecting ribs 49, which are integrally formed by extrusion molding with an aluminum alloy,
The pair of left and right end members 37 includes an outer wall 60 attached to the rotary machine frame 4 and a peripheral wall 61 projecting inwardly from the outer wall 60 and externally fitted to the left and right ends of the main cover 34. Are integrally molded.

According to a fourth aspect of the present invention, the left and right ends of the main cover 34 are paired by fasteners 62 through which the upper and lower walls 45, 46 and the front and rear walls 47, 48 are inserted into the peripheral wall 61 of the end member 37. The end member 37 is fixed .

According to the first aspect, the main cover is extruded with an aluminum alloy, so that the weight can be reduced, the number of parts can be reduced, the number of welded parts is reduced, and the manufacturing cost is reduced.
Moreover, although stones and the like scattered during the rotary work collide with the inner surface of the main cover, scratches due to the collision do not appear on the surface of the main cover.

According to claim 2, welding for attaching the locking piece to the main cover is not required, and mounting parts such as bolts and nuts for attaching the elastic cover to the main cover can be eliminated, further reducing the cost. Can be realized.
According to the third aspect, the left and right ends of the main cover can be fitted and supported by the left and right end members.
According to the fourth aspect, the fixing of the main cover to the pair of end members can be ensured by the fastener.

  According to the fifth aspect, by filling the damping material or the foamed resin, it is possible to reduce the generation of noise due to the stone hitting the main cover through the elastic cover, and the noise can be reduced.

It is side surface sectional drawing of the cover apparatus which shows 1st Embodiment of this invention. It is a disassembled perspective view of the cover apparatus. It is a top view of the cover apparatus. It is the XX sectional view taken on the line of FIG. It is a side view of the rotary tiller. It is a disassembled perspective view of the cover apparatus which shows 2nd Embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 5 show a first embodiment of the present invention. In FIG. 5, reference numeral 1 denotes a rotary tiller detachably connected to a rear portion of a tractor vehicle body via a connecting device (auto hitch) 3.
The rotary cultivator 1 employs a side drive type rotary in the present embodiment. The rotary cultivator 1 includes a rotary machine frame 4 and a rotary cultivating unit 5 provided at a lower portion of the rotary machine frame 4. And a rotary cover (cover device) 6 that covers the rotary tiller 5.

The upper part of the rotary machine frame 4 is fixed on the outer side of the left and right support arms 8 and a pair of left and right support arms 8 projecting outward in the left and right directions from the left and right sides of the gear case 7. The transmission case 9 and a side frame 10 (see FIG. 3) having an upper portion fixed to the outer end side of the right support arm 8 are provided.
The rotary tiller 5 includes a claw shaft 11 that is supported between a lower portion of the transmission case 9 and the side frame 10 so as to be rotatable about a horizontal axis, and a plurality of tillers that are attached and fixed on the claw shaft 11. The claw shaft 12 is rotated around the axis in the left-right direction in the direction of arrow A so that the tilling claw 12 enters the soil while rotating around the claw shaft 11, Is cultivated and crushed and released to the rear. Therefore, in the case of this embodiment, the rotation center line of the rotary tillage part 5 has faced the left-right direction.

  The gear case 7 is provided with a PIC shaft 14 that is linked to a PTO shaft that protrudes rearward from the rear portion of the tractor vehicle body via a joint device 13, and the power transmitted from the PTO shaft to the PIC shaft 14 is within the gear case 7. The power input to the gear case 7 is transmitted from the transmission shaft provided in the left support arm 8 to the claw shaft 11 through the transmission mechanism in the transmission case 9, and the claw is driven by the power. The shaft 11 is rotationally driven in the direction indicated by the arrow A and plowed down.

A top mast 18 is provided on the gear case 7 so as to protrude upward, and an upper connecting portion 20 constituted by pins arranged in the left-right direction is fixed to the front upper portion of the top mast 18.
A connecting bracket 21 is fixed to each of the left and right support arms 8, and a lower connecting portion 22 is provided on the front end side of each of the left and right connecting brackets 21. ing.

The connecting device 3 is connected to an upper top link 23, a pair of lower left and right lower links 24, and rear ends of the top link 23 and the left and right lower links 24. The top link 23 and the left and right lower links And hitch frame 25 for giving a fixed shape to 24.
The hitch frame 25 is provided at a main frame 27 formed by bending a square pipe material into a mountain shape when viewed from the front, an upper member 28 provided at the top of the main frame 27, and lower left and right sides of the main frame 27. The lower member 29 and a connecting frame 27 </ b> A for connecting the left and right ends of the main frame 27 are provided.

The rear end side of the top link 23 is pivotally connected to the front portion side of the upper member 28, and the upper connection portion 20 can be engaged (fitted) from below on the rear portion side of the upper member 28. An upper connected portion 30 formed of an open concave portion is formed above.
The left and right lower members 29 are pivotally connected to the rear end side of the lower link 24 on the same side in the left-right direction, and the lower connecting portion 22 on the same side in the left-right direction is engaged (fitted) from the rear. ) A lower engaging portion 31 that is open at the rear is formed.

  The rotary cover 6 of the rotary tiller 1 includes a main cover 34 that covers the upper side of the rotary tiller 5, a rear cover 35 that covers the rear of the rotary tiller 5, and a side cover that covers both the left and right sides of the rear of the rotary tiller 5. The middle part of the main cover 34 is connected to and supported by the support arm 8 via a bracket, and end members 37 are provided at both left and right ends of the main cover 34.

The rear cover 35 is pivotally supported at the upper end side on the rear end side of the main cover 34 so as to be pivotable about the axis of a support shaft 39 having a horizontal axis, whereby the rear cover 35 is rearwardly attached to the rear end edge of the main cover 34. A cover 35 is attached so as to be swingable up and down. Further, a pair of left and right lowering devices 40 for urging the rear cover 35 downward (in the grounding direction) are provided across the rotary machine frame 4 and the rear cover 35.
1 to 5, the main cover 34 includes an upper wall 45, a lower wall 46, a front wall 47, and a rear wall 48, and the upper wall 45 and the lower wall 48 are interposed between the front wall 47 and the rear wall 48. A plurality of connecting ribs 49 are provided to connect the wall 46 with a space in the front-rear direction. The upper and lower walls 45, 46, the front and rear walls 47, 48, and the plurality of connecting ribs 49 are integrally formed of aluminum alloy by extrusion molding. Molded.

  The upper wall 45, the lower wall 46, the front wall 47, and the rear wall 48 are formed in a bag shape (annular) that is flat in the vertical direction when viewed from the side, and the upper and lower walls 45, 46, the front and rear walls 47, 48, and a plurality of connections. Each of the ribs 49 is formed with a constant thickness in the left-right direction, and the thickness of each part can be appropriately set. (In the example shown, the lower half of the rear wall 48 and the rear end of the lower wall 46 are thicker than the other parts. The rigidity is partially increased in the necessary part.

  The plurality of connecting ribs 49 are arranged in parallel with the rotation center line of the rotary tiller 5 over the left and right directions of the main cover 34, and the plurality of connecting ribs 49 have a continuous waveform (zigzag) in a side view. Left and right cavities between the front wall 47 and the connecting rib 49 between the upper wall 45 and the lower wall 46, between the adjacent connecting ribs 49 and between the connecting rib 49 and the rear wall 48, respectively. 51 is formed, and each cavity 51 has a triangular shape in a side view. The vibration damping material or foamed resin 53 is filled between the upper and lower walls 45 and 46 of the main cover 34 by inserting and arranging the vibration damping material or foamed resin 53 in all or part of the plurality of cavities 51.

Main cover locking pieces 55 project downward from a plurality of locations in the front-rear direction on the lower wall 46 of the main cover 34 (in the example shown, four locations at regular intervals in the front-rear direction). Each main cover locking piece 55 has a pair of locking projections 56a and 56b that are bent in an L shape in side view, and is integrally formed on the lower surface of the lower wall 46 of the main cover 34.
Both ends of each main cover locking piece 55 are positioned inward in the left-right direction with respect to the upper and lower walls 45, 46, the front and rear walls 47, 48 and the plurality of connecting ribs 49 of the main cover 34. In other words, the left and right ends of the upper and lower walls 45, 46, the front and rear walls 47, 48, and the plurality of connecting ribs 49 protrude outward from the main cover locking pieces 55.

This is because each main cover locking piece 55 is integrally formed by extrusion molding with an aluminum alloy together with the upper and lower walls 45, 46, the front and rear walls 47, 48, and the plurality of connecting ribs 49. Both ends are cut and notched.
At the rear end of the main cover 34, a receiving recess 57 is formed over the entire length in the left-right direction, with the lower wall 46 protruding rearward from the upper wall 45 and the rear wall 48.

The pair of left and right end members 37 includes an outer wall 60 that is mounted on the rotary machine frame 4 and a peripheral wall 61 that protrudes inwardly from the outer wall 60 and is fitted to the left and right ends of the main cover 34. These are integrally formed by aluminum die casting.
Upper and lower walls 45 and 46, front and rear walls 47 and 48, and left and right ends of the plurality of connecting ribs 49 (both left and right ends of the main cover 34) projecting outward in the left-right direction from the main cover locking piece 55 are end members. The left and right ends of the main cover 34 are fixed to the pair of end members 37 by fasteners 62 such as bolts and nuts that are inserted into the peripheral wall 61 and vertically penetrate the peripheral wall 61.

That is, mounting holes 64 penetrating vertically are provided in the front portion and the rear portion of the peripheral wall 61, and attachments penetrating vertically corresponding to the mounting holes 64 in the front and rear portions of the left and right ends of the main cover 34. A hole 65 is provided, and a fastener 62 is inserted into the attachment holes 64, 65, and the left and right ends of the main cover 34 are fastened and fixed to the pair of end members 37 by the fastener 62.
The seat surface on which the bolt head of the fastener 62 contacts the peripheral wall 61 and the seat surface on which the nut contacts are parallel to each other.

  A pair of front and rear mounting pieces 67 and 68 are provided on the transmission case 9 and the side frame 10 so as to protrude outward in the front-rear direction, and correspondingly, the front and rear portions of the outer walls 60 of the pair of end members 37 A mounting hole 69 penetrating in the left-right direction is provided, and the outer walls 60 of the pair of end members 37 are fixed to the mounting pieces 67 and 68 by fasteners 71 such as bolts and nuts inserted through the mounting hole 69, respectively. .

Cylindrical end member bearing portions 75 that externally hold and hold both left and right end portions of the support shaft 39 of the rear cover 35 are provided at the rear end portions of the pair of end member members 37.
A cylindrical rear cover bearing portion 76 is provided at the upper end portion of the rear cover 35, and the support shaft 39 is inserted and held in the rear cover bearing portion 76 so as to protrude both left and right. The end member bearing portions 75 of the pair of end members 37 are fitted and held, and the shaft 39 pivots around the end member bearing portion 75 of the support shaft 39 or the shaft of the rear cover bearing portion 76 relative to the support shaft 39. The rear cover 35 is swingably supported around the support shaft 39 by swinging around the center. The rear cover bearing portion 76 is disposed on the receiving recess 57 of the main cover 34.

Left and right rear cover locking pieces 78 are projected in front from a plurality of locations in the vertical direction on the front surface of the rear cover 35 (in the figure, three locations at regular intervals in the vertical direction). Each rear cover locking piece 78 has the same configuration as the main cover locking piece 55, and the plurality of rear cover locking pieces 78 are integrally formed on the front surface of the rear cover 35.
The rear cover 35 including the rear cover bearing portion 76 and the rear cover locking piece 78 is integrally extruded with an aluminum alloy.

An elastic cover 80 is disposed on the lower surface side of the main cover 34 and the front surface side of the rear cover 35. The elastic cover 80 is made of rubber or elastic synthetic resin or the like, and has a main cover corresponding portion 81 and a rear cover corresponding portion 82.
A plurality of front engaging pieces 84 are integrally projected on the upper surface of the main cover corresponding portion 81 of the elastic cover 80 so as to correspond to the main cover locking pieces 55 at intervals in the front-rear direction. The plurality of front engagement pieces 84 are formed in a T shape, and are slidably engaged with the respective main cover locking pieces 55 from the left and right sides. 81 is detachable from the main cover 34.

  A plurality of rear engagement pieces 86 are integrally projected from the rear surface of the rear cover corresponding portion 82 of the elastic cover 80 at intervals in the vertical direction so as to correspond to the respective rear cover locking pieces 78. The plurality of rear engagement pieces 86 are formed in a T shape, and are slidably engaged with the respective rear cover locking pieces 78 from the left and right sides. 82 is detachable with respect to the rear cover 35.

  According to the above embodiment, when the elastic cover 80 is attached to the main cover 34 and the rear cover 35, the plurality of front engagement pieces of the main cover corresponding portion 81 with the main cover 34 removed from the left and right end members 37. 84 is slid and engaged with each main cover locking piece 55 from the outside in the left-right direction, and a plurality of rear engagement pieces 86 of the rear cover corresponding portion 82 are engaged with each rear cover locking piece 78 from the left-right direction outside. Then, the left and right ends of the main cover 34 are inserted into the peripheral walls 61 of the pair of end members 37, and the left and right ends of the main cover 34 are joined to the pair of end members 37 by the fasteners 62. The elastic cover 80 can be easily attached to the main cover 34 and the rear cover 35.

  FIG. 6 shows a second embodiment. Cylindrical main cover bearing portions 88 and rear cover bearing portions 76 are alternately projected in the left-right direction at the rear end portion of the main cover 34 and the upper end portion of the rear cover 35. The main cover bearings 88 and the rear cover bearings 76 are alternately fitted in the left and right directions, and the support shafts 39 are inserted into the bearings 88 and 76. Thus, the rear cover 35 is supported at the rear end portion of the main cover 34 so as to be swingable around the support shaft 39.

A receiving recess 57 is formed at the rear end portion of the main cover 34 in an intermittent manner corresponding to the rear cover bearing portion 76, with the lower wall 46 protruding rearward from the upper wall 45 and the rear wall 48. Yes. The rear end portion of the left and right end member 37 is provided with a notched cylindrical fitting holding portion 89 that externally holds the left and right outer end portions of the main cover bearing portion 88.
The main cover bearing portion 88 is formed by extruding the main cover bearing portion 88 with an upper and lower walls 45, 46, front and rear walls 47, 48, a plurality of connecting ribs 49, and a plurality of main cover locking pieces 55 using an aluminum alloy. After the integral molding, the portion corresponding to the rear cover bearing portion 76 of the main cover bearing portion 88 is cut and cut out to form an intermittent shape.

The other points are the same as those in the first embodiment, and the weight can be reduced in the same manner as in the first embodiment, the number of parts such as mounting parts is reduced, the number of welding points is reduced, and the manufacturing cost is lowered. The effect which becomes.
In the embodiment, a plurality of main cover locking pieces 55 are integrally formed on the lower surface of the lower wall 46 of the main cover 34. Instead, the upper and lower walls 45, 46, the front and rear walls 47, 47 of the main cover 34 are provided. 48 and a plurality of connecting ribs 49, the main cover locking piece 55 is formed separately, and the plurality of main cover locking pieces 55 are attached to the lower wall 46 of the main cover 34 by screws or welding. May be.

  Further, the left and right end members 37 may be formed by other casting, sheet metal or the like without being integrally formed by aluminum die casting.

1 Rotary tiller 4 Rotary machine frame 5 Rotary tiller 6 Rotary cover (cover device)
34 Main cover 37 End member 45 Upper wall 46 Lower wall 47 Front wall 48 Rear wall 49 Connecting rib 53 Damping material or foamed resin 55 Main cover locking piece 60 Outer wall 61 Peripheral wall 62 Fastener 80 Elastic cover 84 Front engagement Fragment

Claims (4)

A main cover (34) covering the upper side of the rotary tiller (5) is provided between the pair of left and right end members (37), and the rear cover (35) can swing up and down at the rear edge of the main cover (34). A rotary tiller cover device attached to the
The main cover (34) connects the upper and lower walls (45, 46), the front and rear walls (47, 48), and the upper and lower walls (45, 46), and is a rotary tillage part across the left and right direction of the main cover (34). (5) having a plurality of connecting ribs (49) arranged parallel to the rotation center line, these are integrally formed by extrusion molding with an aluminum alloy,
A plurality of cavities (51) having a triangular shape in a side view are formed in the main cover (34) by upper and lower walls (45, 46), front and rear walls (47, 48), and a plurality of connecting ribs (49). The rotary tiller cover device is characterized by being formed alternately and continuously with the connecting rib (49). A plurality of cavities (51) having a triangular shape in a side view between upper and lower walls (45, 46) of the main cover (34) are filled with a damping material or a foamed resin (53) having a triangular shape in a side view . The rotary tiller cover device according to claim 1. A main cover (34) covering the upper side of the rotary tiller (5) is provided between the pair of left and right end members (37), and the rear cover (35) can swing up and down at the rear edge of the main cover (34). A rotary tiller cover device attached to the
The main cover (34) connects the upper and lower walls (45, 46), the front and rear walls (47, 48), and the upper and lower walls (45, 46), and is a rotary tillage part across the left and right direction of the main cover (34). (5) having a plurality of connecting ribs (49) arranged parallel to the rotation center line, these are integrally formed by extrusion molding with an aluminum alloy,
The pair of left and right end members (37) project outwardly from the outer wall (60) attached to the rotary machine frame (4) and from the outer wall (60) to the left and right end portions of the main cover (34). A rotary tiller cover device in which an outer fitting peripheral wall (61) is integrally formed by aluminum die casting.   The upper and lower walls (45, 46) and the front and rear walls (47, 48) of the main cover (34) are inserted into the peripheral wall (61) of the end member (37) and penetrate the peripheral wall (61). The rotary tiller cover device according to claim 3, wherein the cover device is fixed to the pair of end members (37) by fastening fasteners (62).

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