JP3681221B2 - Rear hitch structure of agricultural machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rear hitch structure for a sub work machine that is detachably mounted on a rear part of an agricultural machine having a rotary part provided in front of a traveling wheel.
[0002]
[Prior art]
Conventionally, a rear hitch that is detachably equipped with a sub-work machine such as a soil cultivator, a seeding machine, and a leveling board at the rear of the machine body of an agricultural work machine has a substantially U-shaped hitch piece having a pin hole penetrating vertically, The hitch pin is inserted into and supported by the pin hole of the substantially U-shaped hitch piece, and the connecting piece provided at the front of the sub work machine is inserted between the substantially U-shaped hitch pieces, and the connecting piece is punched. A hitch pin is inserted into a pin hole in the vertical direction provided and a pin hole of the substantially U-shaped hitch piece to connect to each other.
[0003]
By the way, in a farm working machine provided with a rotary part behind the traveling wheel, a sub work machine is equipped behind the rotary part, and by operating the steering handle of the farm work machine up and down while driving the rotary part. The height of the rotary part relative to the traveling wheel can be adjusted with the traveling wheel as a fulcrum to adjust the depth of tilling by the rotary part. Since the sub work machine moves up and down together with the rotary unit, the farm work machine can be run without being affected by the sub work machine.
[0004]
[Problems to be solved by the invention]
However, the conventional rear hitch equipped on the agricultural machine is configured so that the sub-work machine cannot be moved up and down with respect to the agricultural machine. In an agricultural machine equipped with a sub-work machine behind the wheel, when operating the steering handle of the agricultural machine up and down to adjust the depth of tilling by the rotary part, the sub work machine is supported by the ground by the lowering operation In addition to being unable to raise the rotary part with respect to the traveling wheel and adjusting the depth, there is a problem that the traveling of the agricultural machine is hindered.
[0005]
Even when a sub-work machine is installed in the rear part of a farm machine with a rotary part in front of the traveling wheel, the present invention can adjust the depth of the rotary part and change the attitude of the farm machine by changing the unevenness of the farm field. The main object of the present invention is to provide a rear hitch structure that can be driven without affecting the machine.
[0006]
[Means for Solving the Problems]
In order to achieve the above-mentioned main object, the present invention is characterized in that, as shown in FIG. 1, the invention according to claim 1 is detachably mounted on the rear part of an agricultural machine having a rotary part in front of a traveling wheel. A rear hitch structure for a work machine, wherein the upper link member and the lower link member, and the upper link member and the lower link member are supported so as to be swingable up and down via a horizontal axis, and the link is movable up and down. A hitch body having a receiver, a vertical guide part for guiding the link receiver up and down, and a plurality of restricting holes for stepwise restricting the vertical movement of the link receiver; and the upper link member and the lower link member A sub-work machine attachment member attached to a free end, and the link receiver has a support shaft portion that engages with the vertical guide portion and a restriction member that selectively engages with the restriction hole. It is characterized by.
[0008]
[Effects of the invention]
In the first aspect of the invention, as shown in FIG. 1, the sub work machine attachment member connected to the sub work machine is freely swung up and down with respect to the hitch body 1 via the upper and lower link members. Therefore, the sub work machine can be made to follow at a certain depth without affecting the vertical change of the farm work machine. Therefore, the depth of tilling by the rotary unit can be adjusted without being affected by the sub work machine. In addition, the link receiver supporting the link member is moved in the vertical direction along the longitudinal guide portion, and the restriction member of the link receiver is engaged with the restriction hole, so that the link receiver is moved up and down stepwise. Therefore, the vertical position of the sub work machine can be changed step by step corresponding to the depth adjustment of the tillage depth by the rotary part of the farm work machine.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
The agricultural machine A shown in FIG. 1 includes the frame 102 in the machine body 100 including a frame 102 on which the engine 101 is mounted, and a transmission case 104 having a main shaft 103 interlocked with a drive shaft of the engine 101 and connected to the lower portion of the frame 102. The engine 101 is mounted on the upper portion of the transmission 102, and an axle 105 is provided on the lower rear side of the transmission case 104 via a power transmission mechanism that interlocks with the rotation of the main shaft 103, and the traveling wheel 106 is supported on the axle 105. Further, a rotary portion 107 having an input shaft that is linked to the rotation of the main shaft 103 via a power transmission mechanism in the mission case 104 is provided at the front of the airframe 100 in front of the traveling wheel 106. In front of the rotary unit 107, the height a corresponding to deep plowing is set to the support height for the airframe 100. It can be changed to three working heights, height b corresponding to standard plowing and height c corresponding to shallow plowing, and height d during non-working where the body 100 is moved outside the field without plowing. Elevating wheels 108 are provided. The elevating wheel 108 has an arm 108a that is pivotally supported by the frame 102 so as to be movable up and down, and a single rotating wheel 108b supported by a free end of the arm 108a. In addition, a rear hitch H which is detachably equipped with a sub-work machine B such as a soil cultivator, a seeding machine, a leveling board, and the like on the rear upper side of the mission case 104, and obliquely upward from the upper position of the rear hitch H portion to the rear. An extending steering handle 109 is provided.
[0011]
2 to 4, the rear hitch H of the embodiment includes left and right hitch pieces 12, 12 having link receivers 11, 11 facing left and right at a predetermined interval, and these hitch pieces 12, 12 The upper and lower link members 3 that are vertically opposed to the link receivers 11, 11 in the hitch main body 1, each of which is composed of a coupling piece 13 that connects the lower front end of the upper and lower sides via the two first horizontal shafts 2, 2. , 4 are supported so as to be swingable up and down, and adapters 5 which are sub-worker mounting members connected to a sub-work machine B comprising a soil culturing machine are attached to the free ends of these link members 3, 4. It is attached so as to be rotatable relative to each other via horizontal shafts 6 and 6.
[0012]
The adapter 5 is inserted into and supported by cylindrical upper and lower stays 51 and 51 that are opposed to each other at a predetermined interval in the vertical direction, a coupling piece 52 that couples the stays 51 and 51, and a hole in each stay 51 and 51. It consists of second horizontal axes 6 and 6. A cylindrical connecting portion 53 extending vertically is provided on the rear surface of the connecting piece 52, and a connecting shaft portion G provided at the front end portion of the sub work machine B is removably inserted into the connecting portion 53. The adapter 5 is connected to the sub work machine B so that the vertical position of the adapter 5 can be adjusted by detachably inserting a pin into a horizontal hole 53a formed in the intermediate portion of the connecting portion 53 in the vertical direction. .
[0013]
Each link member 3, 4 is composed of a link piece facing left and right and a bridging piece that bridges these link pieces, and includes a bridging piece in the upper link member 3 and a coupling piece 52 in the adapter 5. The first and second rising pieces 31 and 54 projecting upward are projected, and one of the rising pieces 31 and 54 is in contact with the other to swing the adapter 5 downward with respect to the hitch body 1. A regulating screw 7 for regulating the range is provided to be adjustable.
[0014]
Each link receiver 11 of the hitch body 1 may be formed integrally with the left and right hitch pieces 12 and 12, but is formed separately in the embodiment.
[0015]
The rear hitch H in the agricultural machine configured as described above supports the adapter 5 so as to be swingable up and down via the upper and lower link members 3 and 4 on the hitch body 1, so that the rotary unit 107 is driven. When the steering handle 109 is operated up and down several times in the state where the rotary section 107 is adjusted, the sub work implement B can be moved up and down following the up and down movement of the rotary section 107. . That is, when the steering handle 109 is lowered and the rotary part 107 is raised with respect to the traveling wheel 106 to reduce the tilling depth by the rotary part 107, the adapter 5 connected to the sub work machine B in the grounding state is The upper and lower link members 3, 4 swing upward with respect to the hitch body 1, and the steering handle 109 is raised to lower the rotary portion 107 relative to the traveling wheel 106, thereby rotating the rotary When the plowing depth by the portion 107 is increased, the adapter 5 connected to the sub work machine B is lower than the hitch body 1 through the upper and lower link members 3 and 4 with the load of the sub work machine B. Therefore, the depth adjustment can be easily performed.
[0016]
Further, in the embodiment, each link receiver 11 in the hitch body 1 is formed separately from each hitch piece 12 so as to be movable up and down, and each hitch piece 12 has a vertical guide portion 14 formed of a long hole extending vertically, A lateral guide strip 15 that extends forward from the upper end of the vertical guide portion 14, a regulation recess 16 that extends downward from the tip of the lateral guide strip 15, and a locking pin 17 that is installed below the vertical guide portion 14. The link receivers 11, 11 are provided with upper and lower stay shafts 18, 18 installed between the front ends of the link receivers 11, 11, and end edges of the stay shafts 18, 18. The upper and lower support shaft portions 19 and 20 that project outwardly through the link receivers 11 and 11 and engage with the vertical guide portion 14, the lock lever 21 that is fixed to the upper stay shaft 18, and the lock lever Always lock 21 A biasing spring 22 for biasing the 置側 is provided with a Hisagete 23 extended between the rear side upper portion of the link receiving body 11, 11. In addition, a washer 25 and a retaining pin 26 that can be inserted and removed are provided at the ends of the support shaft portions 19 and 20.
[0017]
A hook-like engaging portion 21 a that extends downward and engages with the locking pin 17 is provided at an end of the lock lever 21 that is fixed to the stay shaft 18, so that the hitch body 1 of the link receiver 11 is provided. It is trying to regulate the upswing against.
[0018]
According to this embodiment, when the steering handle 109 is lowered to raise or turn the rotary part 107, the sub work machine B can be manually raised upward. Therefore, the sub work machine B can be easily turned or moved in an unplowed state without being supported by the ground.
[0019]
The raising operation of the sub work machine B can be unlocked by operating the lock lever 21 in the clockwise direction in FIG. 2 against the urging spring 22, so that the lock lever 21 is operated while holding the handle 23. The upper working shaft 19 is engaged with the restricting recess 16 in this raised state, so that the upper working state of the sub working machine B can be maintained by the load of the sub working machine B.
[0020]
Further, by providing the lateral guide strip 15, the upper support shaft 19 of the link receiver 11 is laterally moved into the lateral guide strip 15 when the sub work machine B is lifted upward to turn or move. With this lateral movement, the link receiver 11 can be tilted forward as indicated by the chain line in FIG. 2, so that the rear part of the sub work machine B connected to the adapter 5 can be raised with respect to the front part. It is. Therefore, when the rotary unit 107 is raised and the farm work machine A is turned or moved, not only the sub work machine B can be moved upward with respect to the farm work machine A but also the rear part of the sub work machine B with respect to the front part. It can be raised upward. As a result, even if the rotary unit 107 is raised, the rear part of the sub work machine B does not come into contact with the farm field, and the sub work machine B is brought into contact with the farm field and the sub work machine B is less damaged. Can do. In addition, turning does not become impossible by contact.
[0021]
In the above embodiment, the lock lever 21 is provided to restrict the upward movement of the link receiver 11, but in addition, as shown in FIGS. 5 and 6, the hitch pieces 12 are connected to the vertical guide portions 14. On the other hand, a plurality of round restricting holes 24 that are positioned forward and restrict the vertical movement of the link receiver 11 in stages are provided, and the restricting holes 24 and A restricting member 8 that selectively engages may be provided so that the vertical position of the sub work machine B can be adjusted stepwise.
[0022]
The restricting member 8 includes a non-circular support collar 81 that is inserted and supported between the link receivers 11 and 11 so as to be slidable only in the left and right directions, and a horizontal collar 82 that is bent forward from one end of the support collar 81. And an engaging shaft portion 83 bent from the front end of the lateral flange portion 82 to the side facing the support flange portion 81, and the engagement shaft portion 83 is always engaged with the restriction hole 24 in the support flange portion 81. An urging spring 9 that urges in the direction to be wound is wound.
[0023]
In this embodiment, the engagement of the engagement shaft portion 83 with the restriction hole 24 is released by sliding the restriction member 8 against the biasing spring 9, and the engagement is released. In a state where the tip of the shaft portion 83 is in contact with the surface of the hitch piece 12, the adapter 5 can be moved upward or downward together with the sub work machine B, and the engaging shaft is moved along with the operation of the adapter 5. The part 83 enters and engages with the upper or lower restriction hole 24 by the force of the biasing spring 9. At this time, since the support collar 81 is inserted through the non-circular hole of the link receiver 11 and does not rotate, the operation state of the sub work machine B can be maintained, and the restriction hole 24 is round, The engagement shaft portion 83 easily enters the restriction hole 24. In addition, since the vertical position of the sub work machine B can be adjusted by a one-touch operation of operating the adapter 5 together with the sub work machine B by sliding the regulating member 8, the lifting wheel of the rotary unit 107 can be adjusted. In accordance with the depth adjustment by 108, the follow-up operation of the sub work machine B can be switched and adjusted with one touch.
[0024]
In this embodiment, as in the embodiment of FIGS. 1 to 5, when the steering handle 109 is lowered to raise or turn or move the rotary unit 107, the sub work machine B is manually raised upward. Therefore, the sub work machine B can be easily turned or moved without being supported by the ground. At this time, the engagement of the engagement shaft portion 83 with the restriction hole 24 is released.
[0025]
In addition, when the sub work machine B connected to the adapter 5 is a leveling / leveling plate, the leveling / leveling plate is inserted and supported by the cylindrical connecting portion 53 of the adapter 5 as shown in FIG. The existing flat plate portion 201 that extends straight rearward from the lower portion of the connecting shaft portion G in the left-right direction and the leveling plate portion 202 that extends rearward from the lower end of the flat plate portion 201 may be used. 7. As shown in FIG. 8, a connecting shaft portion G that is inserted into and supported by the cylindrical connecting portion 53 of the adapter 5, and a plane having a receding angle θ that is inclined rearward from the lower portion of the connecting shaft portion G in the left-right direction. A flat plate portion 201 having a generally rectangular shape in view and a leveling plate portion 202 having a triangular shape in plan view that is inclined obliquely downward from a slightly upper position to the lower end edge of the flat plate portion 201 are used. Is preferred.
[0026]
When the leveling / leveling plate of FIG. 9 is used, since the shape of the leveling plate portion 201 is straight in the left-right direction, the soil flow in front of the leveling plate portion 201 cultivated by the rotary portion 107 is poor and accumulates. While the resistance due to the leveling and leveling plate increases and a slip phenomenon may occur in the agricultural machine A, when the leveling and leveling plate shown in FIGS. Since the soil is inclined toward the rear, the soil in front of the flat plate portion 201 cultivated by the rotary portion 107 flows almost evenly from the central portion of the flat plate portion 201 to the left and right. It can be made thin and flat, and it can also prevent the slip phenomenon from occurring in the agricultural machine. In addition, the existing leveling and leveling boards are equipped so that they cannot be adjusted up and down with respect to the farm machine body. Although it is necessary to adjust the level of the leveling / leveling plate with the steering handle 109, the leveling / leveling plate of the embodiment can move up and down via the link members 3, 4. It can be arbitrarily moved up and down following the up and down movement, and stable tillage work can be easily performed.
[Brief description of the drawings]
FIG. 1 is a side view of an entire farm work machine equipped with a rear hitch and a sub work machine according to the present invention.
FIG. 2 is a partially omitted side view of a rear hitch in a state where a sub work machine is connected.
3 is a plan view of only the rear hitch of FIG. 2. FIG.
4 is a sectional view taken along line XX in FIG.
FIG. 5 is a partially omitted side view corresponding to FIG. 2 and showing another embodiment.
6 is a plan view of only the rear hitch of FIG.
FIG. 7 is a perspective view of a leveling and leveling board.
8 is a longitudinal sectional view of FIG.
FIG. 9 is a perspective view of an existing leveling and leveling board.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Hitch main body 2 ... Horizontal axis 3 ... Upper link member 4 ... Lower link member 5 ... Sub work implement attachment member 8 ... Restriction member 11 ... Link receiving body 14 ... Vertical guide part 19, 20 ... Support shaft 24 ... Regulation hole A ... Agricultural work machine B ... Sub work machine 106 ... Running wheel 107 ... Rotary part

Claims (1)

In front of the vehicle wheel a Riyahitchi structure for the sub-working machine that is detachably mounted on the aft body of the agricultural machine comprising a rotary unit,
An upper link member and a lower link member;
Swingably supporting the upper link member and the lower link member to vertically through the horizontal axis and the vertical movement is freely linked receptacle, a vertical guide portion for guiding the link receptacle up and down, the A hitch body having a plurality of restricting holes for stepwise restricting the vertical movement of the link receiver;
And a sub-working machine mounting member attached to the free end of the upper link member and the lower link member,
The link hitch has a rear hitch structure for an agricultural machine, comprising a support shaft portion that engages with the vertical guide portion and a restriction member that selectively engages with the restriction hole .

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