JP2002176807A - Rotary tiller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an easy-to-use rotary tiller having improved tilling workability and operability. SOLUTION: The driving force of an engine 23 of a rotary tiller 10 is transmitted to a traveling shaft 20 and a tilling shaft 17 through a power transmission mechanism in a casing 11, a driving wheel 21 is rotated by the traveling shaft 20 and a tilling tine 18 is rotated by the tilling shaft 17. The casing 11 of the rotary tiller 10 has a chevron form by side view, the tilling shaft 17 is attached to the front end 12 of the casing 11, the traveling shaft 20 is attached to the rear end 13 of the casing 11, the engine 23 is attached to the upper end 14 of the casing 11 and above the traveling shaft 20 and a tilling depth controlling means 40 is attached to the rear end 13 of the casing 11 to adjust the tilling depth H.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary cultivator for tilling soil by rotating a tilling nail with a tilling shaft.

[0002]

2. Description of the Related Art Among rotary tillers, there is a patent No. 30.
As disclosed in Japanese Patent No. 15821, “Agricultural work machine”, there is a machine body provided with a front wheel and a rear wheel at front and rear ends of a body, and a rotary tilling device between the front wheel and the rear wheel. The rotary tiller disclosed in the publication is shown in the following figure, and its technology will be described in detail.

FIG. 11 is a side view of a conventional rotary tiller. The rotary tiller 100 includes a transmission case 10
A driving wheel (referred to as “rear wheel”) 10 is provided at the rear end 102 of the vehicle.
5, a rotary device 106 is provided at a front end 103 of the transmission case 101, and a swing arm 107 is extended forward from the front end 103 of the transmission case 101. The engine 109 is provided at the upper end 104 of the transmission case 101.

[0004] By swinging the swing arm 107 downward about the support pin 110, the front wheel 108 is lowered to the running position (the state shown in the figure). This allows the tilling claws 106a of the rotary device 106 to float above the cultivated land 112, and the rear wheel 10
5 and the front wheel 108.

[0005] On the other hand, the cultivated land 112 is
When plowing the rock, the swing arm 107 is
And swing upwards as indicated by arrow a. This allows
The tilling claws 106a of the rotary device 106 are cultivated 11
2, the cultivated land 112 can be tilled with the tilling claws 106a.

[0006]

However, since the front wheel 108 is provided in front of the rotary device 106, the area S1 between the front wheel 108 and the rotary device 106 becomes a dead space when cultivating the cultivated land 112. Therefore, the front wheel 108
Reaches the partition of the cultivated land 112 (hereinafter referred to as “ridge”), the rotary tiller 100 cannot further advance, and the rotary device 106 cannot plow the area S1. For this reason, it is difficult to efficiently perform the tillage operation with the rotary tiller 100.

Further, when the cultivated land 112 is tilled, the rotary device 106 and the front wheel 10 are driven by the reaction force R1 generated by the tilling.
8 floats, and it is difficult to keep the plowing depth of the rotary device 106 suitable. In addition, since the front wheel 108 is provided in front of the rotary device 106, it is difficult for an operator to recognize the floating of the front wheel 108 from behind the rotary cultivator 100 even if the front wheel 108 is lifted.

Further, since the front wheel 108 is provided in front of the rotary device 106, the total length L1
Increase. In addition, it is necessary to increase the weight of the rotary cultivator 100 in order to prevent the rotary device 106 and the front wheel 108 from floating from the cultivated land 112 during tilling. in this way,
By increasing the total length L1 and the weight of the rotary tiller 100, the burden on the operator when operating the rotary tiller 100 increases. For this reason, the practical use of the rotary cultivator excellent in operability and tilling workability has been desired.

Accordingly, an object of the present invention is to provide a rotary tilling machine which is easy to use by improving tilling workability and operability.

[0010]

According to a first aspect of the present invention, a driving force of a driving source is transmitted to a traveling shaft and a tilling shaft via a power transmission mechanism in a casing extending in a front-rear direction. In a rotary cultivator that rotates a running wheel with a shaft and rotates a tilling claw with a tilling shaft, the casing is formed in a substantially elliptical shape in a side view, the cultivating shaft is attached to a front end of the casing, and the A driving shaft is mounted, the driving source is mounted on the upper end of the casing and above the running shaft, and a cultivation depth adjusting means for adjusting a tilling depth is mounted on a rear end of the casing.

By attaching a tillage shaft to the front end of the casing, a tillage claw can be provided at the tip of the vehicle body. Therefore,
When tilling the cultivated land with the tilling claws, for example, it is possible to easily tilling to the vicinity of the furrow separating the cultivated land and the cultivated land, so that the tilling workability can be improved.

Further, by providing the plowing depth adjusting means at the rear end of the casing, the reaction force generated when the plow is tilled with the plow can be efficiently received by the plowing depth adjusting means. Therefore, since the tilling nails can be prevented from rising, the tilling depth can be easily maintained in a suitable state.

[0013] Further, since the wheel is not provided in front of the tilling claw as in the prior art, the total length of the rotary tiller can be shortened. In addition, since the driving source is mounted above the traveling axis, the own weight of the driving source can be supported by the traveling wheels. Therefore, it is possible to prevent the handle from being lifted by the weight of the drive source. Therefore, the operability of the handle can be kept good.

According to a second aspect of the present invention, the cultivation depth adjusting means is configured such that the swing bracket is rotatably mounted on the casing, and a resistance bar is mounted on the swing bracket, so that the resistance rod is moved between the cultivation depth adjustment position and the traveling position. A cam plate which is movable and which can hold the resistance bar at the plowing depth adjustment position and the traveling position is swingably mounted on the casing, and holding means for holding the cam plate at a use position is provided. By holding the plate in the use position and engaging the engaging recess of the cam plate with the pin of the swing bracket, the resistance rod is held in the plowing depth adjustment position and the pin is placed on the receiving surface of the cam plate. Hold the resistance bar in the traveling position, attach a swing lever to the cam plate that swings the cam plate to the standby position against the holding means, and hold the resistance plate in the standby position with the swing lever. Till depth adjustment position and running Characterized in that it moves to the position.

By setting the cam plate at the standby position with the swing lever, the resistance bar can be moved between the plowing depth adjustment position and the running position. In addition, while the cam plate is held at the use position, the engagement of the cam plate is maintained. The resistance rod can be held at the plowing depth adjustment position by the joint recess, and the resistance rod can be held at the traveling position by the receiving surface of the cam plate. For this reason, it is possible to easily arrange the resistance bar between the plowing depth adjustment position and the traveling position.

Further, by providing the cam plate with the engaging concave portion and the receiving surface, the resistance bar can be arranged at the plowing depth adjustment position and the traveling position. For this reason, the configuration of the tillage depth adjusting means can be simplified.

[0017]

Embodiments of the present invention will be described below with reference to the accompanying drawings. Note that "before", "after",
“Left” and “right” follow the direction seen from the worker. Also, the drawings should be viewed in the direction of reference numerals. FIG. 1 is a side view of a rotary tiller according to the present invention, and shows a plowed state of a rotary tiller 10. The rotary tiller 10 includes a casing 1
1, the tilling shaft 17 of the rotary device 16 is attached to the front end 12, the traveling shaft 20 is attached to the rear end 13 of the casing 11,
An engine (drive source) 23 is mounted on the upper end of the casing 11 and above the traveling shaft 20, a handle 30 is mounted on the casing 11, and the handle 30 is extended rearward. , Tillage depth).

According to the rotary tiller 10, the resistance rod 41 of the tillage depth adjusting means 40 is inserted into the cultivated land 35, and the engine 23 is operated by the recoil starter 24 (shown in FIG. 2). By gripping the clutch pulley 31 and operating the clutch lever 32, the tension pulley 25
Strongly against the belt 26. As a result, the driving force of the engine 23 is transmitted to the belt 26 via the first pulley 27, and the rotation of the belt 26 transmits the rotational force to the second pulley 28. The rotational force of the second pulley 28 is
1 via a power transmission mechanism (not shown)
And transmitted to the tilling shaft 17.

Thus, by rotating the traveling wheel 21 on the traveling shaft 20 and rotating the cultivating claws 18 on the cultivating shaft 17, the cultivating claws 18.
Tilling the arable land 35 with. At this time, the cultivation depth H is adjusted by the resistance bar 41 of the cultivation depth adjusting means 40. The operator holds the rotary tiller 1 while gripping the grip portion 31 (see also FIG. 2).
Walk to follow 0.

FIG. 2 is a plan view of the rotary tiller according to the present invention, which is provided with a cover 19 for preventing earth and sand from being scattered above the tillage claws 18... Are attached to a width substantially equal to the tillage width W2 of the tillage claws 18. As a result, it is possible to prevent the cultivated land 35 tilled by the tilling claws 18. In addition, 37 is a governor control lever, and 38 is a forward march changeover switch.

FIG. 3 is an enlarged view of a main part of the rotary tiller according to the present invention, in which a casing 11 is formed in a substantially elliptical shape in a side view, and a tilling shaft 17 is attached to a front end 12 of the casing 11. Attach the traveling shaft 20 to the end 13,
This shows a state in which the engine 23 is mounted on the upper end 14 of the casing 11 and above the traveling shaft 20 and the rear end flange portion 15 of the casing 11 is provided with cultivation depth adjusting means 40 for adjusting the tilling depth.

The cultivation depth adjusting means 40 is attached to the rear end flange 15 of the casing 11 via first and second bearing shafts 43 and 44. By inserting the resistance rod 41 into the cultivated land 35, the tilling claws 18 rotate while rotating the cultivated land 35.
When the till is plowed, a reaction force R is applied to the rear end 13 side of the casing 11 as shown by an arrow. This reaction force R can be received by the resistance bar 41. Therefore, it is possible to prevent the tilling claws 18 from rising.

For this reason, as in the prior art, the engine 2
By moving the 3 toward the front end 12 of the casing 11, it is not necessary to apply the own weight of the engine 23 to the tilling shaft 17 to prevent the tilling shaft 17 from rising. Therefore, the engine 23 can be provided substantially above the traveling shaft 20. Accordingly, the weight of the engine 23 is applied to the left and right traveling wheels 2 via the traveling shaft 20.
1 and 21, it is possible to prevent the grip portion 31 (shown in FIG. 2) from easily rising due to the weight of the engine 23. As a result, the operator can relatively easily maintain the grip portion 31 at the tilling position.

FIGS. 4 (a) and 4 (b) are diagrams illustrating the tilling state of the rotary cultivator according to the present invention. FIG. 4 (a) is a comparative example of the rotary tiller 100 described in the section of the prior art.
(B) shows the rotary tiller 10 described in the embodiment as an “example”.

In (a), since the front wheel 108 is provided in front of the rotary cultivator 100, the area S between the front wheel 108 and the rotary cultivator 100 when the cultivated land 112 is cultivated.
1 is dead space. Therefore, for example, when the front wheel 108 comes into contact with the ridge 113 separating the cultivated land and the cultivated land, the cultivating claws 106a of the rotary device 106 cannot cultivate the region S1.

When the cultivated land 112 is plowed, the rotary device 106 is urged by the reaction force R1 acting on the rotary device 106.
And the front wheel 108 floats, and it is difficult to suitably adjust the plowing depth H1 of the rotary device 106. In addition, since the front wheel 108 is provided in front of the rotary tiller 100, when the front wheel 108 floats, the rotary tiller 100
It is difficult for an operator to recognize the floating of the front wheel 108 from behind.

Furthermore, since the front wheel 108 is provided in front of the rotary tiller 100, the total length L of the rotary tiller 100
One is increased. In addition, it is necessary to increase the weight of the rotary tiller 100 in order to prevent floating from the cultivated land 35 during tillage. If the total length L1 and weight of the rotary tiller 100 increase, it is difficult to maintain good handleability.

In (b), since the front wheel is not provided in front of the rotary device 16, when cultivating the arable land 35, for example, it is possible to easily till the vicinity of the furrow 36 that separates the arable land from the arable land. .

Further, a resistance bar 41 is provided behind the traveling wheel 21, and the resistance bar 41 is inserted into the cultivated land 35. Thereby, when the tilling claw 18 of the rotary device 16 plows the cultivated land 35, even if the rotary device 16 receives a reaction force R as indicated by an arrow, the reaction force R can be received by the resistance rod 41. . Therefore, it is possible to prevent the tilling claws 18, that is, the rotary device 16 from rising. As a result, the plowing depth H of the rotary device 16 can be easily adjusted appropriately.

In addition, by providing the resistance bar 41 behind the traveling wheel 21, the resistance bar 41 can be arranged at a position that is easy for an operator to see. Therefore, the cultivated land 3 of the resistance rod 41
5 can be checked, so that the operator can easily adjust the plowing depth H while looking at the resistance bar 41.

Further, since the front wheel is not provided in front of the rotary device 16, the total length L of the rotary tiller 10 is reduced.
Can be shortened. In addition, when tilling, resistance rod 4
1 prevents the rotary device 16 from floating.
There is no need to move the engine 23 to the front end 12 side of the casing 11 and use the own weight of the engine 23 to prevent the rotary device 16 from rising as in the related art.

Accordingly, the engine 23 can be provided substantially above the traveling shaft 20. For this reason, the own weight of the engine 23 can be supported by the traveling wheels 21, so that the engine 2
The lifting of the grip portion 31 by its own weight of 3 can be suppressed. Therefore, the operator can maintain the grip portion 31 in the tilling position relatively easily. As a result, it is possible to maintain good handleability.

FIG. 5 is an exploded perspective view of the tillage depth adjusting means according to the present invention. The tilling depth adjusting means 40 is provided on the casing 11 via the first support shaft (support bolt) 43.
5 is rotatably mounted, and the resistance bar 41 is mounted on the swing bracket 45, so that the resistance bar 41 is moved to a plowing depth adjustment position P1 (shown in FIG. 1) and a traveling position P2 (shown in FIG. 6). And a cam plate 55 capable of holding the resistance rod 41 at the plowing depth adjustment position P1 and the traveling position P2.
1 is provided with a holding means 67 for swingably mounted via a second support shaft (support pin) 44 and holding the cam plate 55 at a use position P3 (shown in FIG. 1). The resistance rod 41 is held at the plowing depth adjustment position P1 by engaging the engagement concave portion 56 of the cam plate 55 with the pin 48 of the swing bracket 45 with the 55 held at the use position P3. By placing the pin 48 on the receiving surface 57, the resistance bar 41 is held at the traveling position P2, and the swing lever 65 that swings the cam plate 55 to the standby position P4 (shown in FIG. This is a means for moving the resistance bar 41 between the plowing depth adjustment position P1 and the traveling position P2 in a state where the resistance bar 41 is attached to the plate 55 and the cam plate 55 is held at the standby position P4 by the swing lever 65.

The swing bracket 45 is a member bent in a substantially U-shape, and has left and right mounting holes 46a, 47a (not shown) at the upper ends of the left and right side walls 46, 47, respectively. A boss 49 is provided coaxially with the mounting hole 46a, and the right and left side walls 46 and 47 are fitted into the rear end flange portion 15 of the casing 11, and the mounting hole 49a of the boss 49, the left mounting hole 46a, and the upper mounting hole of the rear end flange portion 15. The bearing bolt 43 is inserted into the 15a and the right mounting hole 47a. The washer 50a is inserted into the inserted bearing bolt 43, and the bearing bolt 43 is inserted.
Into the nut 50b. Thereby, the casing 1
The swing bracket 45 can be attached to the rear end flange portion 15 of the first swingably.

A tube 52 is welded to the bent portion 51 of the swing bracket 45, a resistance bar 41 is inserted into the tube 52, and a fixing pin 53 is inserted into the bent portion 51, the tube 52, and the resistance bar 41. Lock pin 54 on 53
Is attached to prevent the fixing pin 53 from coming off. The upper end 41a of the resistance bar 41 has a plurality of mounting holes 42.
(Only one is shown), and these mounting holes 42
The height of the resistance bar 41 is adjusted by inserting the fixing pin 53 into.

The cam plate 55 is a member in which the upper and lower sides of a substantially rectangular plate are removed in a curved shape. The cam plate 55 has a cam boss 61 at a lower end 55a, and a support pin 44 is provided in a mounting hole 61a of the cam boss 61 and the cam plate 55. The return spring 62 is attached to the support pin 44, and the support pin 44 is inserted into the lower mounting hole 15b of the rear end flange portion 15. The washer 63a is inserted into the inserted support pin 44, and the lock pin 63b is inserted into the hole 44a.

Thus, the cam plate 55 can be swingably attached to the rear end flange 15 of the casing 11, and one end 62a of the return spring 62 is applied to the rear end flange 15, and the other end 62b is connected to the cam plate 55. The cam plate 55 can be urged to the use position P3 by the spring force of the return spring 62 by inserting the cam plate 55 into the insertion hole 55c.

The holding means 67 includes a return spring 6
2, the boss 49 of the swing bracket 45 and the stopper 58 of the cam plate 55. Hereinafter, returning to FIG. 3, the operation of the holding means 67 will be described. The cam plate 55 and the swing lever 65 are urged downward by the spring force of the return spring 62 (shown in FIG. 5) as shown by the arrow, and the stopper 58 of the cam plate 55 contacts the boss 49 of the swing bracket 45. Thereby, the cam plate 55 and the swing lever 65 can be held at the use position P3 (shown in FIG. 1).

Then, when the operator grasps the swing lever 65 and applies a lifting force as shown by a hollow arrow, the cam plate 55 and the swing lever 65 are opposed to the spring force of the return spring 62 to a standby position P4 as shown by an arrow. Until (shown in FIG. 7), it can swing upward about the bearing pin 44.

Returning to FIG. 5, the tillage depth adjusting means 40 includes a swing bracket 45 for connecting the resistance bar 41 to the casing 11 so as to be able to swing, a pin 48 protruding from the swing bracket 45, and a swing bracket. A swing center (bearing pin 44) provided at a position different from the swing center (bearing bolt 43) of 45 is attached to the casing 11 so as to be able to swing, a lower side 55a is provided with an engaging recess 56 that meshes with the pin 48, and an upper side 55b is provided with a pin. Receiving surface 57 on which 48 is placed
A cam plate 55 capable of swinging about a rotation center to a standby position P4 where the pin 48 does not interfere and a use position P3 where the pin 48 interferes;
And a swing lever 65 extending from the swing lever 5.

FIG. 6 is a side view of the rotary tiller according to the present invention, and shows a running state of the rotary tiller 10. The rotary cultivator 10 pushes down the grip portion 31 while holding the resistance rod 41 of the tillage depth adjusting means 40 at the travel position P2 to thereby rotate the casing 11 around the travel shaft 20.
Swings counterclockwise. Therefore, the rotary device 16 is lifted upward, and the tilling claws 18.
5 can be lifted upward from the surface 35a. Thus, the traveling wheels 21 can easily travel on the surface 35a of the cultivated land 35.

Here, the engine 23 approaches the traveling shaft 20 by swinging the casing 11 counterclockwise around the traveling shaft 20. Therefore, the traveling wheel 21 can more efficiently receive the own weight of the engine 23 as compared with the state at the time of tilling. For this reason, the engine 23
The lifting of the grip portion 31 by its own weight can be suppressed. Therefore, the operator can maintain the grip portion 31 in the traveling position relatively easily. As a result, it is possible to maintain good handleability.

Next, the operation of the rotary tiller 10 will be described. FIGS. 7A and 7B are explanatory diagrams of a first operation of the rotary tiller according to the present invention. (A) In FIG.
Is shown at the tillage depth adjustment position P1. By performing the tilling work in this state, the resistance indicated by the arrow F acts on the resistance rod 41. Therefore, the resistance bar 41 tends to swing backward about the bearing bolt 43. However, the engagement recess 56 of the cam plate 55 is
The resistance bar 41 can be prevented from swinging backward during tilling.

That is, the bearing pins 44 of the cam plate 55 are offset downward from the bearing bolts 43. Therefore, the swing trajectories of the swing bracket 45 and the cam plate 55 are different, and the swing bracket 45 and the cam plate 55 cannot move integrally. For this reason, in a state where the engaging recess 56 is locked to the pin 48, the cam plate 55 can be kept stationary even when the force F1 acts on the engaging recess 56 from the pin 48. Therefore, it is possible to prevent the pin 48 from coming off from the engagement concave portion 56 during the tillage and the resistance bar 41 from rising.

When the resistance bar 41 is moved from the plowing depth adjustment position P1 to the traveling position P2, first, the operator grips the swing lever 65 and moves the swing lever 65 to the spring of the return spring 62 (shown in FIG. 5). It swings upward (hereinafter referred to as “lift”) as shown by an arrow from the use position P3 around the bearing pin 44 against the force.

In FIG. 8B, with the operator holding the swing lever 65, the swing lever 65 is moved to the standby position P.
Hold at 4. In this state, the resistance rod 41 is connected to the bearing bolt 43.
Is lifted from the tillage position P1 as indicated by an arrow.

FIGS. 8 (a) and 8 (b) are views for explaining the second operation of the rotary tiller according to the present invention. In (a), after the resistance bar 41 is moved to a position P5 slightly higher than the traveling position P2, the swing lever 65 is swung downward from the standby position P4 as indicated by an arrow (hereinafter referred to as “lower”). Here, by moving the resistance bar 41 to a position P5 slightly higher than the traveling position P2, it is possible to prevent the cam plate 55 from interfering with the pins 48.

In (b), the swing lever 65 is returned to the use position P3. By the spring force of the return spring 62 (shown in FIG. 5), the stopper portion 58 of the cam plate 55
, The swing lever 65 is held at the use position P3. In this state, the resistance bar 41 is moved from the position P5 to the traveling position P2.
Lower as shown by the arrow.

FIGS. 9 (a) and 9 (b) are explanatory diagrams of a third operation of the rotary tiller according to the present invention. In (a), when the resistance bar 41 is lowered to the traveling position P2, the pin 48 of the swing bracket 45 is placed on the receiving surface 57 of the cam plate 55.
Thereby, the resistance bar 41 can be held at the traveling position P2. This state is the same as that of FIG. 6, and the rotary device 1 is held by holding the resistance rod 41 at the traveling position P2.
6 can be run on the running wheels 21 while floating.

Next, when the resistance bar 41 is moved from the traveling position P2 to the plowing depth adjustment position P1, the resistance bar 41 is first lifted as shown by an arrow to a position P5 slightly higher than the traveling position P2. In (b), the operator moves the swing lever 6.
5 and swing lever 65 to return spring 6
The support pin 44 is lifted up from the use position P3 as shown by an arrow against the spring force of 2 (shown in FIG. 5). Here, the resistance bar 41 is moved to a position P5 slightly higher than the traveling position P2.
The cam plate 55 can be prevented from interfering with the pin 48 by moving to the maximum position.

FIGS. 10 (a) and 10 (b) are views for explaining a fourth operation of the rotary tiller according to the present invention. In (a),
While the operator holds the swing lever 65, the swing lever 65 is held at the standby position P4. In this state, the resistance rod 41 is lowered from the tilling position P5 with the bearing bolt 43 as an axis as shown by the arrow.

In (b), after lowering the resistance bar 41 to the plowing depth adjustment position P1, the swing lever 65 is moved to the standby position P.
Lower from 4 as indicated by the arrow. As a result, the state shown in FIG. That is, the pin 48 of the swing bracket 45
The engaging recess 56 of the cam plate 55 is engaged with By holding the cam plate 55 at the use position by the spring force of the return spring 62 (shown in FIG. 5), the engagement recess 56 can be prevented from coming off the pin 48.

As described with reference to FIGS. 7 to 10, according to the plowing depth adjusting means 40, when the cam plate 55 is disposed at the standby position P4, the resistance rod 4 does not interfere with the cam plate 55 with the pin 48.
1 can be moved to the plowing depth adjustment position P1 and the traveling position P2. In addition, when the cam plate 55 is disposed at the use position P3, the resistance rod 41 is held at the plowing depth adjustment position P1 by the engagement recess 56 of the cam plate 55, and the resistance rod 41 is received by the receiving surface 57 of the cam plate 55. Can be held at the traveling position P2. Therefore, the resistance bar 41 can be easily held at the plowing depth adjustment position P1 and the traveling position P2, so that the operability is simplified and the usability can be improved.

In addition, by providing the cam plate 55 with the engagement concave portion 56 and the receiving surface 57, the resistance bar 41 can be arranged at the plowing depth adjustment position P1 and the traveling position P2 only by the cam plate 55. For this reason, since the configuration of the tillage depth adjusting means 40 can be simplified, the cost can be reduced.

In the above embodiment, the holding means 67
Has been described using the return spring 62, but other elastic members may be used.
In addition, although an example has been described in which the cam plate 55 is a member in which the upper and lower sides of the substantially rectangular plate are removed in a curved shape, the shape of the cam plate 55 may be arbitrarily set.

[0056]

According to the present invention, the following effects are exhibited by the above configuration. According to the first aspect of the present invention, it is possible to arrange the tilling claw at the front end of the vehicle body by attaching the tilling shaft to the front end of the casing. Therefore, when tilling the arable land with the tilling claws, for example, it is possible to easily till the vicinity of the furrow separating the arable land from the arable land, so that the tilling workability can be improved.

By providing the tillage depth adjusting means at the rear end of the casing, it is possible to efficiently receive the reaction force generated when tilling the cultivated land with the tillage claws. Therefore, since the tilling nails can be prevented from rising, the tilling depth can be easily maintained in a suitable state.

Further, as in the prior art, the wheel is not provided in front of the tilling claw, so that the total length of the rotary tilling machine can be shortened. In addition, since the drive source is mounted above the traveling axis, the own weight of the drive source can be supported by the traveling wheels. Therefore, it is possible to prevent the handle from being lifted by the weight of the drive source. Therefore, the operability of the handle can be kept good.

As described above, the tillage work can be simplified, the plowing depth can be suitably maintained, and the operability of the handle can be kept good, so that the usability of the rotary tiller can be improved. Can be.

According to the second aspect, the cam plate is moved to the standby position by the swing lever so that the resistance rod can be moved between the tillage depth adjustment position and the traveling position. In addition, the cam plate is held in the use position. The resistance bar can be held at the plowing depth adjustment position by the engaging concave portion of the cam plate, and the resistance bar can be held at the traveling position by the receiving surface of the cam plate. For this reason, it is possible to easily arrange the resistance bar between the plowing depth adjustment position and the traveling position. Therefore,
Since handling can be simplified, usability is improved.

Further, by providing the engaging recess and the receiving surface on the cam plate, the resistance bar can be arranged at the plowing depth adjustment position and the traveling position. For this reason, since the structure of the tillage depth adjusting means can be simplified, the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a side view of a rotary tiller according to the present invention.

FIG. 2 is a plan view of a rotary tiller according to the present invention.

FIG. 3 is an enlarged view of a main part of the rotary tiller according to the present invention.

FIG. 4 is a diagram illustrating a tilling state of the rotary cultivator according to the present invention.

FIG. 5 is an exploded perspective view of the tillage depth adjusting means according to the present invention.

FIG. 6 is a side view of the rotary tiller according to the present invention.

FIG. 7 is an explanatory view of a first operation of the rotary tiller according to the present invention.

FIG. 8 is a diagram illustrating a second operation of the rotary tiller according to the present invention.

FIG. 9 is an explanatory view of a third operation of the rotary tiller according to the present invention.

FIG. 10 is a diagram illustrating a fourth operation of the rotary tiller according to the present invention.

FIG. 11 is a side view of a conventional rotary tiller.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Rotary cultivator, 11 ... Casing, 12 ... Front end of casing, 13 ... Rear end of casing, 14 ... Upper end of casing, 15 ... Rear flange part, 16 ... Rotary device, 17 ... Tilling shaft, 18 ... Tilling nail , 20 ... running axis, 21
... running wheels, 23 ... engine (drive source), 40 ... tillage depth adjusting means, 41 ... resistance rod, 43 ... bearing bolt (first bearing shaft), 44 ... bearing pin (second bearing shaft), 45 ... swing Bracket, 48 pin, 49 boss, 55 cam plate, 56
… Engaging recess, 57… receiving surface, 58… stopper, 62…
Return spring, 65: swing lever, 67: holding means, P1: plowing depth adjustment position, P2: running position, P3 ...
Use position, P4 ... Standby position.

Claims (2)

[Claims] 1. A driving force of a driving source is transmitted to a traveling shaft and a tilling shaft via a power transmission mechanism in a casing extending in a front-rear direction, and the traveling wheel is rotated by the traveling shaft and the tilling claw is rotated by the tilling shaft. In a rotary cultivator, the casing is formed in a substantially elliptical shape in a side view, the tilling shaft is attached to a front end of the casing, the traveling shaft is attached to a rear end of the casing, and the upper end of the casing and above the traveling shaft A rotary tiller having a drive source attached thereto and tillage depth adjusting means for adjusting a tillage depth at a rear end of a casing. 2. The cultivation depth adjusting means moves the resistance bar between the tilling depth adjustment position and the traveling position by attaching a swing bracket to the casing in a rotatable manner and attaching a resistance bar to the swing bracket. A cam plate capable of holding the resistance bar at the plowing depth adjustment position and the travel position is swingably mounted on the casing, and holding means for holding the cam plate at the use position is provided. While holding the resistance bar in the use position, the engaging recess of the cam plate is engaged with the pin of the swing bracket to hold the resistance rod at the plowing depth adjustment position, and the resistance is set by placing the pin on the receiving surface of the cam plate. A swing lever for holding the rod in the traveling position and swinging the cam plate to the standby position against the holding means is attached to the cam plate. With the cam plate held in the standby position by this swing lever, the resistance rod is plowed. Depth adjustment position and travel position 2. The method according to claim 1, wherein the moving is performed.
The rotary tiller according to the description.