JPH0719204Y2 - Farm work machine - Google Patents

Description

[Detailed Description of the Invention] (Industrial field of application) The present invention relates to an agricultural working machine, for example, an agricultural working machine such as a vine mower for cutting a vine or a potato digging machine for digging a potato.

(Prior Art) Conventionally, as this type of agricultural working machine, for example, the actual exploitation 58
As described in Japanese Patent Publication No. 83235-83, a pillar having a tail wheel rotatably mounted via upper and lower links is movably supported on the rear portion of the Freire mower body so as to be vertically movable. There is known a structure in which a screw shaft portion of the handle body is screwed into a nut body of a support piece protruding from the upper portion of the flare mower body so as to be rotatable and movable back and forth.

Then, by the turning operation of the handle body, the screw shaft portion is moved forward and backward with respect to the nut body according to the turning direction thereof, and the tail wheel of the column is moved up and down via the upper and lower links. The flail mower body is set and supported at a predetermined height position.

(Problems to be Solved by the Invention) In the structure described in the above publication, since the entire weight including the flail mower body is added to the tail wheel, the reaction force received by the tail wheel causes the tail wheel to pass through the pillar and the upper link. As the handle body is pushed forward, its load is concentrated on the screw shaft part and the nut body and they are crimped together, thus
When adjusting the vertical movement of the tail wheel, the turning operation of the handle body is heavy and lacks smoothness, and it takes time to adjust it, and sometimes the vertical movement of the tail wheel must be adjusted with the machine lifted by the three-point link mechanism of the tractor. There is a problem that it takes a lot of trouble to do so.

Therefore, the present invention has been made in view of such a point, and when adjusting the vertical movement of the tail wheel, the handle body can be smoothly and lightly rotated, and the vertical movement of the tail wheel can be easily adjusted. The purpose is to provide an agricultural working machine with excellent operability.

(Means for Solving the Problem) An agricultural working machine according to the present invention comprises a working machine body having a rotary working body and a cover body covering the upper part of the rotary working body, and a rotation center on the left and right parts of the working machine body. A nut body that is rotatably pivoted in the vertical direction on the shaft and that has left and right tail wheels that are rotatably mounted at the rear portion of the rotary work body and that is rotatably mounted on the upper front side. A tail wheel support mechanism that has the support frame, a support frame that has a guide support body that is erected on the upper front side of the working machine body, and is rotatably mounted on the upper end portion, and rotatably supported by the guide support body of the support frame. The screw rod on the rear side is screwed to the nut body so as to rotate and move back and forth, and the left and right tail wheels of the tail wheel support mechanism are vertically movable about the left and right rotation center axes. And a handle body of the tail wheel support mechanism, The left and right mounting arms pivotally mounted in the vertical direction on the left and right rotation center shafts, and the tail wheel projecting rearward from the left and right portions of a connecting rod that connects the left and right mounting arms. A rotatably mounted left and right support arm, and an interlocking piece rotatably rotatably mounted on the nut body which is erected upright in the middle of the interlocking rod connected between the left and right mounting arms, It is stretched between the connecting rod of the tail wheel support mechanism and the rear portion of the cover body, and the left and right tail wheels are turned downward via the left and right support arms about the left and right rotation center axes. And a tension spring that is dynamically biased.

(Operation) In the agricultural work machine of the present invention, the left and right support arms act by the reaction force received by the left and right tail wheels so as to rotate upward about the left and right rotation center axes, and between the left and right mounting arms. While the nut body of the interlocking piece erected on the interlocking rod acts so as to push the handle body forward through the screw rod portion of the handle body, the left and right support arms are provided on the rotary work body side by the tension springs. Is biased downward, the biasing force of this tension spring cancels the upward turning force of the left and right support arms, and
The concentration of the load on the screw rod and the nut body of the handle body is avoided, the handle body is smoothly and lightly rotated, and the left and right tail wheels are easily adjusted up and down via the left and right support arms, and , The rotary working body is easily set to the proper soil position.

(Embodiment) An embodiment of the present invention will be described below with reference to the accompanying drawings.

Reference numeral 1 denotes a working machine main body, which has a main frame 2 extending in the left-right direction, and an input shaft 3 is provided at an intermediate portion of the main frame 2 so as to project forward so as to be rotatable. Mission 4 is provided. Further, the upper parts of the left and right brackets 5 facing the left and right ends of the main frame 2 are respectively fixed, and the chain case 6 is fixed to the outer part of one of the brackets 5, and the inside of the upper part of the chain case 6 is fixed. An output end of an output shaft 7 of the mission 4 rotatably inserted in the main frame 2 is rotatably projected.

Further, lower arms 8 project forward from the left and right sides of the main frame 2, respectively, and in the middle of the left and right lower arms 8 and in the middle of the top arm 9 projecting forward from the upper part of the mission 4. A vertical support frame 10 is integrally connected and fixed, and a hollow cylindrical guide support 12 is rotatably mounted on an upper end of the support frame 10 by a support shaft 11. Further, lower pins 13 are provided at the tip of the left and right lower arms 8 in a protruding manner,
A connection hole 14 is formed at the tip of the top arm 9.

Further, the left and right brackets 5 and chain cases 6
A rotary work body 15 is rotatably mounted between the lower end portions of the rotary shaft, and the rotary work body 15 is rotatably mounted between the left and right brackets 5 and the chain case 6 near the lower end portions thereof. A plurality of work claws 18 such as flare claws are radially provided on the circumferential side of each flange 17 fixed and provided with a predetermined gap in the axial direction of the rotary shaft 16. There is. The input end of the rotary shaft 16 protruding into the chain case 6 of the rotary work body 15 and the output end of the output shaft 7 are rotatably interlocked in the chain case 6 via an interlocking medium 19. ing.

An arc-shaped cover body 20 covering the upper portion of the rotary working body 15 is fixed between the upper portions of the left and right brackets 5, and a lower portion of the connecting frame 21 fixed to the rear end portion of the cover body 20. Further, auxiliary covers 22 and 23 made of a rubber plate or the like are vertically provided at the front end of the cover body 20.

Next, on the left and right rear sides of the main frame 2, there is a rotation center shaft.
A mounting piece 25 having 24 is integrally projected, and a tail wheel support mechanism B is rotatably attached to the left and right rotation center shafts 24 so as to be vertically rotatable. The tail wheel support mechanism B has left and right mounting arms 26 axially rotatably attached to the left and right rotation center shafts 24, and a left and right mounting arm 26 is provided between rear end portions of the left and right mounting arms 26. Direction connecting support rods 27 are connected to each other, and support arms 28 extending downward and rearward are integrally fixed to both ends of the connecting support rods 27. Intermediate portions of the left and right support arms 28 are stays 28a. At the rear end of the left and right support arms 28, tail wheels 29 located at the rear of the rotary work body 15 are rotatably mounted on support shafts 30, respectively. .

Further, a left and right interlocking rod 31 is fixed between the front side portions of the left and right mounting arms 26, and a pair of interlocking pieces 32 are integrally provided upright in the middle portion of the interlocking rod 31 with a predetermined gap. A nut body 34 is rotatably mounted on a support shaft 33 between the upper ends of the pair of interlocking pieces 32, and the nut body 34 has a female screw hole 35.

Further, in the female screw hole 35 of the nut body 34, a screw rod portion 38 having a male screw 37 formed on the rear side portion of the round bar-shaped handle body 36 in the front-rear direction is rotatably and advancingly inserted and screwed. A front side portion of the handle body 36 is rotatably inserted and supported in the guide support 12, and stoppers 39 for preventing the handle body 36 in the front and rear portions of the guide support body 12 are formed. A handle 40 is fixed to the front end of the handle body 36.

Further, an upper mounting piece 41 is integrally projectingly provided at an intermediate rear portion of the connecting support rod 27, and is located below the upper mounting piece 41, and an intermediate portion of the rear horizontal plate 42 of the connecting frame 21 of the cover body 20. A lower mounting piece 43 is integrally provided on the upper part, and the left and right support arms 28 about the left and right rotation center shafts 24 are provided between the upper and lower opposing upper mounting pieces 41 and 43. A tension spring 44 for tensioning the left and right tail wheels 29 downward is stretched via the.

The tension spring 44 is a moment of the left and right support arms 28 that is rotated upward with respect to the weight W of the agricultural work machine A about the rotation center shaft 24 generated by the reaction force F _{1 received} by the left and right tail wheels 29. It is formed to have a tensile force S with which a moment M _S for rotating the left and right support arms 28 downward with respect to M _F is equal. The tension spring 44 may be set in advance with a predetermined tensile force S as shown in FIG. 1, and as shown in FIG. The tensile force S may be stretched so as to be adjustable via the bolt 44a and the nut 44b.

In such a structure, the left and right lower links 46 of the tractor 45 are rotatably connected to the lower pins 13 of the left and right lower arms 8 and the connecting holes 14 of the top arm 9 are connected.
The top link 47 of the tractor 45 is rotatably connected to the tractor 45 via a connecting pin 48, and the input shaft 3 and the power takeoff shaft 49 of the tractor 45 are fixed around the shaft and extendable only in the axial direction. Connect via. As a result, the agricultural work machine A is supported between the three-point link mechanism of the tractor 45 and the left and right tail wheels 29.

Next, when the handle main body 36 is rotated by the handle 40, the screw rod portion 38 is rotated forward and backward with respect to the nut body 34, and depending on the rotation direction, the left and right rotation center shafts 24 are centered. The left and right support arms 28 are rotated up and down via the mounting arms 26, and the tail wheels 29 of the left and right support arms 28 are adjusted up and down, respectively, and the rotary work body 15 is properly paired with the left and right tail wheels 29. Easily set in soil position.

In this case, the reaction force F _{1 received} by the left and right tail wheels 29 causes each of the left and right support arms 28 to rotate upward about the rotation center shaft 24, respectively, and the pair of interlocking movements is performed. While the nut body 34 of the piece 32 acts to push the handle body 36 forward through the screw rod portion 38 of the handle body 36 with a predetermined pushing force (m _F ), the left and right support arms 28 Since the tension spring 44 is urged downward on the rotary work body 15 side by a predetermined pulling force S, the nut body 34 has a predetermined pulling force (m _S ) through the screw rod portion 38 of the handle body 36. It acts to pull the handle body 36 rearward, and accordingly, the downward urging force of the tension spring 44 cancels the upward turning force of the left and right support arms 28, and the screw rod of the handle body 36. A pair of load concentration on the part 38 and the nut body 34 is avoided, and the hand With the body 36 is smoothly and lightly rotating operation, left and right tail wheel 29 is easily moved up and down regulated, and rotary working body 15 can be easily set to an appropriate tide position.

(Effect of the Invention) According to the present invention, the left and right support arms having the tail wheels for supporting the weight of the working machine are urged downward by the tension springs having a predetermined tension force. The load is not concentrated between the screw rod part of the handle body that rotates the support arm up and down and the nut body on the support arm side, and the handle body is smooth and light when adjusting the vertical movement of the left and right tail wheels. Therefore, it is possible to perform a pivoting operation, and therefore, it is possible to easily perform vertical movement adjustment of the left and right tail wheels that set the anti-soil position of the rotary working body, and it is possible to provide an agricultural work machine having excellent operability.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an embodiment of the present invention. FIG. 1 is a perspective view of an agricultural working machine, FIG. 2 is a sectional view showing a part of the same as above, and FIG.
The figure is a side view of the farm work machine. 1 …… Working machine main body, 10 …… Support frame, 12 …… Guide support, 15 …… Rotary work, 20 …… Cover, 24 ……
Rotation center shaft, 26 ... Mounting arm, 27 ... Coupling rod, 28 ...
… Support arm, 29 …… Tail wheel, 31 …… Interlocking rod, 32 …… Interlocking piece, 34 …… Nut body, 36 …… Handle body, 38 …… Screw rod, 44 …… Tension spring.

Claims (1)

[Scope of utility model registration request] 1. A working machine body having a rotary working body and a cover body covering an upper portion of the rotary working body,
The left and right parts of the work machine main body are pivotally mounted in the vertical direction about a rotation center axis, and have left and right tail wheels rotatably mounted on the rear part of the rotary working body and the front upper part. A tail wheel support mechanism having a rotatably mounted nut body, and a support frame having a guide support body erected on the upper front side of the working machine body and rotatably mounted on the upper end portion,
The tail wheel support mechanism is rotatably supported by the guide fulcrum of the support frame and has a screw rod portion on the rear side screwed to the nut body so as to be rotatable and movable back and forth. And a rotatable handle body for vertically adjusting the left and right tail wheels of the vehicle, wherein the tail wheel support mechanism is mounted on the left and right rotation center shafts so as to be vertically rotatable. The arms are connected between the left and right mounting arms, and the left and right support arms projecting rearwardly from the left and right portions of the connecting rod that connects the left and right mounting arms and rotatably mounted the tail wheel. And an interlocking piece that rotatably rotatably mounts the nut body on the middle upper portion of the interlocking rod, and is stretched between the connecting rod of the tail wheel support mechanism and the rear portion of the cover body. The left and right tail wheels are lowered through the left and right support arms about the left and right rotation center axes. Agricultural machine, characterized in that it comprises a and a tension spring pivots energized toward.