Tilling implement

Abstract

To provide a tilling implement that facilitates maintenance in a rotary tilling implement provided with a tine shaft penetrating a flange provided at a right and left side parts in the lower part of a transmission case and extending to the right and left, solving the problem in a conventional rotary tilling implement that since the flange is exposed, the flange and the attaching bolt wear out in the tilling work, and tightening and loosening of the bolt becomes difficult, which causes the maintenance to be difficult.SOLUTION: In a tilling implement in which a transmission case 23 for transmitting power from a travelling vehicle body is provided in a machine body 20 mounted on the travelling vehicle body, and a tine shaft 26 equipped with tilling tines 31 penetrating a flange 28 fixed to the transmission case 23 by a bolt 29, and extending in the right-left direction of the machine body 20 is provided to be driven and rotated freely, a detachable cover 40 is provided for protecting the flange 28 and the bolt 29.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a tillage implement mounted on a traveling vehicle body such as a tractor. [Background technology]

[0002] There is a rotary cultivator having a claw shaft that extends left and right and passes through flanges provided on the left and right sides of a lower portion of a transmission case (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2003-199403 A Summary of the Invention [Problem to be solved by the invention]

[0004] In conventional rotary tilling machines, the flanges are exposed, so that the flanges and their mounting bolts wear out during tilling work, making it difficult to tighten and loosen the bolts and making maintenance difficult.

[0005] An object of the present invention is to provide a tilling machine that is easy to maintain. [Means for solving the problem]

[0006] The invention described in claim 1 is a tillage work machine having a transmission case 23 for transmitting power from the running body 1 to a body 20 attached to the running body 1, and a claw shaft 26 equipped with tillage tines 31 extending in the left-right direction of the body 20 through a flange 28 fixed to the transmission case 23 by a bolt 29, which is inserted into the transmission case 23 and is capable of freely driving and rotating, and is provided with a removable cover 40 for protecting the flange 28 and the bolt 29.

[0007] According to the first aspect of the present invention, the removable cover 40 for protecting the flange 28 and the bolt 29 is provided, so that the flange 28 and the bolt 29 can be prevented from wearing down.

[0008] Furthermore, since the cover 40 is detachable, even if it becomes worn, it is not necessary to replace the flange 28 or the bolts 29, and it is sufficient to simply replace the cover 40.

[0009] The invention described in claim 2 is a tilling machine described in claim 1, in which when the cover 40 is attached to the transmission case 23 while covering the flange 28, the height of the side wall surface 40c of the cover 40 is greater than or equal to the height of the bolt 29.

[0010] According to the invention described in claim 2, the height of the side wall surface 40c of the cover 40 is equal to or greater than the height of the bolt 29, so that the bolt 29 is located below the upper end of the side wall surface 40c, thereby appropriately preventing wear of the bolt 29.

[0011] The invention as set forth in claim 3 is the tilling machine as set forth in claim 1, in which the mounting portion of the cover 40 for the bolt 29 is formed as a notch 42.

[0012] According to the invention described in claim 3, the mounting portion of the bolt 29 of the cover 40 is formed as a notch 42, so that the cover 40 can be easily attached by inserting the bolt 29 into the notch 42 by simply loosening it slightly without removing the bolt 29.

[0013] The invention described in claim 4 is a tilling machine described in claim 1 in which, when the cover 40 is attached to the transmission case 23 while covering the flange 28, the height of the side wall surface 40c of the cover 40 is a height that does not interfere with other parts such as the rotating claw bracket 32 ​​and the tilling tines 31.

[0014] According to the invention described in claim 4, the height of the side wall surface 40c of the cover 40 is a height that does not interfere with other parts such as the claw bracket 32 ​​and the tillage tines 31, which rotate, so that the claw bracket 32, the tillage tines 31, and other parts can rotate properly with the cover 40 attached.

[0015] The invention recited in claim 5 is the tiller recited in any one of claims 1 to 4, in which the pitch of the mounting portions 40d, 42 of the cover 40 is the same as the pitch of the mounting holes of the flange 28.

[0016] According to the invention described in claim 5, the pitch of the mounting portions 40d, 42 of the cover 40 is the same as the pitch of the mounting holes of the flange 28, so that the cover 40 can be fixed to the transmission case 23 by fastening together with the flange 28 with the bolts 29. [Brief description of the drawings]

[0017] [Figure 1] 1 is a side view of a tractor equipped with a rotary tilling implement according to an embodiment of the present invention. FIG. [Diagram 2] FIG. 2 is a front view of a main part of the rotary tiller. [Diagram 3] FIG. 2 is a perspective view of a main part of the rotary tiller. [Figure 4] FIG. [Diagram 5] FIG. [Figure 6] FIG. [Figure 7] FIG. [Figure 8] FIG. 11 is a side view of a lower part of a transmission case showing a second embodiment of the present invention. [Figure 9] FIG. 11 is a perspective view of a cover showing a second embodiment. [Figure 10] FIG. 11 is a side view of a lower part of a transmission case showing a third embodiment of the present invention. [Figure 11] FIG. 11 is a perspective view of a cover showing a third embodiment. [Figure 12] FIG. 11 is a side view of a lower part of a transmission case showing a fourth embodiment of the present invention. [Figure 13] FIG. 13 is a perspective view of a cover showing a fourth embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] As one embodiment of the present invention, a rotary tiller that is mounted on an agricultural tractor, which is a type of tiller, will be described.

[0019] <Tractor> As shown in Fig. 1, the tractor 1, which is a traveling vehicle body, is a front-rear four-wheel drive vehicle, and is equipped with left and right front wheels 2L, 2R and left and right rear wheels 3L, 3R at the four corners of the body. A front wheel axle case supporting the left and right front wheels 2L, 2R is attached to the underside of a front frame 4, and a rear wheel axle case supporting the left and right rear wheels 3L, 3R is attached to the left and right rear side surfaces of a transmission case 5.

[0020] An engine 7 is mounted inside a bonnet 6 at the central upper part of the front frame 4, and a radiator, a cooling fan, a fan belt, etc. are arranged in front of the engine 7.

[0021] A control panel 9, a steering wheel 10, and a seat 11 are provided inside the cabin 8, and when the steering wheel 10 is turned left or right, a steering actuator is operated to steer the left and right front wheels 2L, 2R left or right.

[0022] A lifting link 13 that rotates up and down by a lifting hydraulic cylinder 12 serving as a lifting device is provided at the rear of the machine body, and a rotary tiller 14, which is an example of a tiller, is attached to the lifting link 13.

[0023] The lifting link 13 is a typical 3P link and is made up of left and right lower links 13L, 13R that connect the rotary tiller 14 and an upper link 13U that raises and lowers the left and right lower links 13L, 13R by the operation of the lifting hydraulic cylinder 12.

[0024] By operating a position lever provided on the side of the seat 11 inside the cabin 8, the lifting hydraulic cylinder 12 is actuated to raise and lower the upper link 13U, thereby raising and lowering the rotary tiller 14 to a desired height.

[0025] The rotational power of the engine 7 is input to the transmission case 5 via the main clutch. A forward / reverse clutch is provided at the entrance of the transmission case 5, and is configured to switch between forward and reverse as well as to turn the transmission on and off. In addition, the power that passes through the forward / reverse clutch is branched into two systems: a driving force for driving the left and right front wheels 2L, 2R and the left and right rear wheels 3L, 3R, and a PTO driving force for externally taken power.

[0026] The driving force for traveling is transmitted to the rear wheel differential device on the rear axle case via the traveling transmission, which is made up of the forward / reverse transmission, main transmission, and auxiliary transmission, to drive the left and right rear wheels 3L, 3R, and the rear axle case is also provided with left and right brake devices. In addition, the power after being shifted by the traveling transmission is taken out to the front part of the transmission case 5 via the 2WD / 4WD switching device, and is further transmitted by the front wheel drive shaft to the front wheel differential device in the front axle case, to drive the left and right front wheels 2L, 2R.

[0027] The PTO driving force is output to a PTO shaft 15 protruding rearward from the rear part of the transmission case 5 via a PTO clutch and a PTO transmission device. A transmission shaft 16 to the rotary tiller 14 is detachably connected to the protruding part of the PTO shaft 15.

[0028] <Rotary tilling machine> As shown in Figures 2 to 4, the rotary tiller 14 has a body 20 and a transmission case 23 attached to the lower part of a gear case 22 having an input shaft 21 to which the end of the transmission shaft 16 to which the driving force from the tractor 1 is connected, and support arms 24 protrude to the left and right from the gear case 22 and a tilling cover 25 is attached.

[0029] A drive pawl shaft 26 to which power is transmitted from the input shaft 21 via a chain transmission means is supported at the bottom of the transmission case 23.

[0030] The drive claw shaft 26 protrudes to the left and right from the transmission case 23, and is connected to one end of a claw shaft having a number of tilling tines attached to both ends, constituting part of the claw shaft and serving as a horizontal claw shaft.

[0031] The left and right ends of the left and right claw shafts connected to the left and right ends of the drive claw shaft 26 are rotatably supported by left and right support members 23L, 23R provided on the left and right sides of the machine body 20.

[0032] A case side mounting portion 27 having a circular outer periphery is formed protrudingly on the left and right sides of the lower part of the transmission case 23, and a flange 28 is fixed to this case side mounting portion 27 by a plurality of bolts 29 arranged at equal intervals.

[0033] The drive claw shaft 26 passes through the central portion of the case side mounting portion 27 and the flange 28 , extends outward to the left and right, and is rotatably supported by bearings provided in the case side mounting portion 27 and the flange 28 .

[0034] An inclined claw shaft 30 is supported on the outer side of the flange 28 via a bearing so as to be rotatable and inclined downward outward.

[0035] An internal gear is formed on the inner peripheral surface of the inclined claw shaft 30, which meshes with a gear provided on the driving claw shaft 26, and drives the inclined claw shaft 30 which is inclined from the horizontal driving claw shaft 26.

[0036] A number of claw brackets are attached to the claw shafts connected to the left and right sides of the driving claw shaft 26 at intervals in the axial and circumferential directions, and the base of a tilling claw is inserted into each claw bracket and prevented from coming loose by an attachment pin (which can also be a bolt).

[0037] The tillage tines attached to the tine shaft are normal tines or general machete tines, but the tillage tines 31 attached to the inclined tine shaft 30 are special machete tines that can till the soil below the transmission case 23, and multiple tillage tines 31 are attached to the inclined tine shaft 30 via claw brackets 32, offset in the axial and circumferential directions.

[0038] The claw bracket 32 ​​is made by fitting together two different types of C-shaped cross-section members, one large and one small, and welding them to the inclined claw shaft 30, and is attached by inserting the base of the tillage claw 31, inserting a mounting pin through them, and screwing a nut. Note that the claw bracket 32 ​​of the inclined claw shaft 30 protrudes radially outward beyond the claw bracket of the claw shaft.

[0039] In particular, a cover 40 for preventing wear of the flange 28 and the bolts 29 is provided on the lower side of the flange 28 fixed by a plurality of bolts 29 to the case side mounting portion 27 on the left and right sides of the lower part of the transmission case 23.

[0040] As shown in FIGS. 5 to 7, the cover 40 is composed of a bottom surface 40a, a top surface 40b, and a side wall surface 40c that connects the outer ends of the bottom surface 40a and the top surface 40b.

[0041] The bottom surface 40a is provided with bolt holes 40d at both ends and at the center thereof as attachment portions through which the bolts 29 are inserted.

[0042] The pitch of the three bolt holes 40d of the cover 40 is the same as the pitch of the mounting holes of the flange 28 (bolt holes of the case side mounting part 27), so that the bolts 29 can be fastened to the case side mounting part 27 together with the flange 28 to fix the cover 40 to the case side mounting part 27.

[0043] Moreover, the cover 40 has a U-shape that fits along the outer circumferential arc surface of the flange 28 .

[0044] The top surface 40b is made shorter at both ends than the bottom surface 40a so that the bolt holes 40d at both ends of the bottom surface 40a are open, and a notch 40e is provided at a position corresponding to the central bolt hole 40d, so that the bolt 29 can be inserted into the bolt hole 40d from the top surface 40b side to tighten or loosen it.

[0045] To attach the cover 40 to the case side mounting portion 27 on the left and right sides of the lower part of the transmission case 23, the three bolts 29 that attach the lower part of the flange 28 are inserted from the top surface 40b side of the cover 40 through the bolt holes 40d at both ends and in the center of the bottom surface 40a, and then tightened together with the flange 28 to fix it to the case side mounting portion 27.

[0046] Therefore, during tilling work in a field, the lower end of the transmission case 23 may come into contact with or protrude into the field surface, and the lower part of the flange 28 and the bolt 29 may also come into contact with or protrude into the field. However, since the lower part of the flange 28 and the bolt 29 are covered by the cover 40, wear on the lower part of the flange 28 and the bolt 29 can be prevented.

[0047] In addition, since the cover 40 is removable, even if it becomes worn, it is not necessary to replace the flange 28 or the bolts 29, and it is sufficient to simply replace the cover 40.

[0048] Furthermore, when cover 40 is attached to case side mounting portions 27 on the left and right sides of the lower part of transmission case 23 while covering flange 28, the height of side wall surface 40c of cover 40 is made to be equal to or greater than the height of bolt 29, so that bolt 29 is positioned below upper surface 40b, and only cover 40 wears, thereby appropriately preventing wear on bolt 29.

[0049] Furthermore, when the cover 40 is attached to the case side mounting portion 27 on the left and right side surfaces of the lower part of the transmission case 23 while covering the flange 28, the height of the side wall surface 40c of the cover 40 is set to a height that does not interfere with other parts such as the claw bracket 32 ​​and the tillage tines 31, which rotate, so that the inclined claw shaft 30, claw shaft, claw bracket 32 ​​and tillage tines 31 can rotate properly with the cover 40 attached.

[0050] In order to prevent wear on the bottom surface of the lower part of the transmission case 23, a protective plate 50 is fixed by bolts 51 so as to cover the bottom surface of the lower part of the transmission case 23.

[0051] 8 and 9 show a second embodiment of the cover 40. In FIG.

[0052] That is, the difference from the above-described first embodiment is that notches 40e are provided on the top surface 40b of the cover 40 at positions corresponding to the bolt holes 40d at both ends of the bottom surface 40a and the bolt hole 40d at the central position, so that the bolts 29 can be inserted into the bolt holes 40d from the top surface 40b side to tighten or loosen, and the top surface 40b is located to the outside of the bolts 29 inserted into the bolt holes 40d at both ends of the bottom surface 40a.

[0053] Therefore, it is possible to prevent large lumps of earth or the like from coming into contact with the bolts 29 inserted through the bolt holes 40d at both ends of the bottom surface 40a from coming into contact with the bolts from the outside, thereby preventing wear.

[0054] 10 and 11 show a third embodiment of the cover 40. In FIG.

[0055] That is, the difference from the first embodiment is that the cover 40 is formed only by a side wall surface 40c, and mounting pieces 41 having bolt holes 40d are provided at both ends and at the center of the side wall surface 40c.

[0056] Therefore, the cover 40 has a simple and inexpensive structure for covering the outer peripheral surface of the flange 28 to prevent wear.

[0057] 12 and 13 show a fourth embodiment of the cover 40. In FIG.

[0058] That is, the difference from the first embodiment is that the top surface 40b of the cover 40 is a flat plate without a notch so as to cover the bolt 29 when attached, and the bottom surface 40a is provided with notches 42 at both ends and at the center as mounting portions so as to be able to engage with the bolt 29 from the side.

[0059] Therefore, with the bolt 29 loosened at a position corresponding to the notch 42 of the flange 28 which is fixed to the case side mounting part 27 by the bolt 29, the cover 40 can be easily attached by engaging the notch 42 of the cover 40 from the side with the threaded portion of the loosened bolt 29 and tightening the bolt 29. Furthermore, when replacing the cover 40, it can be removed simply by loosening the bolt 29 at the notch 42 position. Thus, the cover 40 can be easily detached and assembly and maintenance are simplified.

[0060] Furthermore, since the upper surface 40b of the cover 40 is a flat plate without any notches so as to cover the bolts 29 when attached, wear of the lower part of the flange 28 and the bolts 29 can be more appropriately prevented.

[0061] Finally, although the above describes a center drive rotary tiller 14 in which the transmission case 23 is located in the central position on the left or right side of the body 20, the same can also be implemented in a side drive rotary tiller in which the transmission case 23 is located on one of the left or right sides of the body 20. [Explanation of symbols]

[0062] 1. Running vehicle (tractor) 20 Aircraft 23 Transmission case 26 Claw shaft (driving claw shaft) 28 Flange 29 Volts 31 Cultivating Claw 32 Claw bracket 40 Cover 40c Side wall 40d Mounting part (bolt hole) 42 Mounting part (notch)

Claims

1. This tillage work machine has a body (20) attached to a running body (1) and a transmission case (23) for transmitting power from the running body (1), and a flange (28) fixed to the transmission case (23) with a bolt (29) is inserted through a claw shaft (26) equipped with tillage tines (31) extending in the left-right direction of the body (20) so as to be freely driven and rotated, characterized in that a removable cover (40) is provided to protect the flange (28) and the bolt (29).

2. A cultivating machine as described in claim 1, characterized in that when the cover (40) is attached to the transmission case (23) while covering the flange (28), the height of the side wall surface (40c) of the cover (40) is equal to or greater than the height of the bolt (29).

3. 2. A cultivating machine according to claim 1, characterized in that the cover (40) has a mounting portion for the bolt (29) formed as a notch (42).

4. A tilling machine as described in claim 1, characterized in that when the cover (40) is attached to the transmission case (23) while covering the flange (28), the height of the side wall surface (40c) of the cover (40) is such that it does not interfere with other parts such as the rotating claw bracket (32) and tilling tines (31).

5. A cultivating machine according to any one of claims 1 to 4, characterized in that the pitch of the mounting portions (40d, 42) of the cover (40) is the same as the pitch of the mounting holes of the flange (28).

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