JPH0746922B2 - Tiller - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention is suitable for use in a tiller, particularly a small tiller in which a rotary is integrally formed. Relates to a tiller equipped with a resistance rod.

(B) Conventional technology Generally, in a tiller, a rotary that can be switched between normal rotation and reverse rotation is installed in a machine body, the rotary rotation is performed normally or reversely, and an operator walks together with a handle to rotate the rotary tiller. The soil is agitated by the claws of the farm and the field is cultivated.

(C) Problems to be Solved by the Invention However, in the conventional tiller described above, when the rotary field is normally rotated, the rotary field is instantaneously advanced to the machine body when the hard rock is buried in the field. This may cause dashing that applies a force in a directional direction, which causes an operator who is running and cultivating while holding the handle with both hands to suddenly pull it forward and fall.

In particular, recently, a small cultivator incorporating a rotary integrally has been devised, but the small cultivator is usually used by an amateur who is unfamiliar with the operation in the kitchen garden, etc. There is a demand for simplicity and even greater safety.

(D) Means for Solving the Problem The present invention is intended to solve the above-mentioned problems, and as shown in FIG. 1 and FIG. The resistance rod 9 and the operating lever 16 are movably installed. When the operating lever 16 switches the rotary 6 to the normal rotation, the resistance rod 9 descends and when the rotary 6 is switched to the reverse rotation, the resistance rod 9 moves. It is characterized in that it is configured so that 9 is raised.

(E) Operation Based on the above-described configuration, the operation lever 16 is operated to operate the rotary 6
When the switch is switched to normal rotation, the resistance rod 9 is moved to the lower side of the machine body in association with the operation, whereby the tiller 1 travels while receiving a large resistance from the soil by the resistance rod 9 to perform tillage work. Further, the rotary 6 is operated by operating the lever 16.
When the switch is switched to the reverse direction, the resistance rod 9 is moved to the upper side of the machine in association with the operation, and in this state, the tiller 1 travels without receiving much resistance from the soil due to the resistance rod 9, and the tillage work is performed. I do.

(F) Example Hereinafter, an example according to the present invention will be described with reference to the drawings.

As shown in FIG. 9, the cultivator 1 includes a mission case 2, an engine 3, traveling wheels 5, which form a body frame.
A rotary 6, a handle 7, a resistance rod 9 and a plowing depth regulating rod 10 are provided. The mission case 2 is made of a large-sized member made of a press-fitting case, and an engine frame 11 for mounting the engine 3 is fixed in front of it.
A rotary cover 12 is installed on the rotary 6. Further, a handle 7 is attached so as to extend obliquely rearward, and traveling wheels 5 and a rotary 6 are attached to the tip end portions of the octagonal case portion, respectively. Further, the belt is wound around the output pulley of the engine 3 to the pulley fixed to the input shaft 13 (see FIGS. 5 and 6) of the transmission case 2 so as to be tensioned and loosened by a tension pulley that constitutes a main clutch. It is hung and the belt and pulley are covered with a case 15. Further, a speed change lever 16 extends from the upper part of the transmission case 2 along the upper side of the handle 7, and the speed change lever 16 is attached to a fuel tank 17 on the upper part of the engine 3 and a guide plate 19 attached to the transmission case 2. Is guided to the guide groove 20 (see FIGS. 7 and 8). The guide groove 20 of the guide plate 19 is lateral (left and right) as shown in FIG. 7 or 8.
Direction is forward 1st speed position F ₁ , forward 2nd speed position F ₂ , neutral position N,
It is composed of a traveling gear position having a reverse position R and a work neutral position N ', and the vertical (up and down) direction is a forward rotation position S and a neutral position N _R.
And a rotary direction switching stage having a reverse rotation position C.

As shown in FIG. 1 to FIG. 6, the gear shift lever 16 has a U-shaped base end portion, and the U-shaped portion 16
a is connected to a shifter interlocking shaft 22 so as to be rotatable in the vertical direction by a bolt pin 21 and integrally interlock in the horizontal direction. Further, the shifter interlocking shaft 22 is rotatably supported by a collar 23 fixed to the mission case 2, and a speed change arm 25 is welded inside the case 2. A transmission shift shaft 26 is arranged on the left and right sides of the mission case 2, and both ends of the shift shaft 26 are clamped by collars 27, 27 and fixed by bolts 29, 29. A shift fork 30 is slidably fitted on the shift shaft 26. Further, the shift fork 30 is a shift shaft.
It is engaged with a traveling shifter gear 31 that is biased to a predetermined position by a click-stop mechanism between it and 26, is coupled to the speed change arm 25, and is spline-coupled only slidably to the input shaft 13. I am fit. On the other hand, a U-shaped interlocking arm 32 is rotatably supported by the collars 27, 27 holding the speed shift shaft 26, and the interlocking arm 32 has a long hole 32a extending in the lateral direction. The shift lever 16 is formed and penetrates the elongated hole 32a. As a result, the interlocking arm 32 pivots around the collar 27 by the vertical movement of the speed change arm 16, but the lateral movement of the lever 16 is a long hole.
It is absorbed by 32a and is not transmitted to the interlocking arm 32. Also,
A rotary shifter interlocking shaft 35 is rotatably supported by a collar 33 fixed to the mission case 2, a plate 36 is fixed to the interlocking shaft 35 outside the case, and a tip end of the plate 36 is further fixed. Has a pin 37 fixed thereto, and the pin 37 is piped to a rod 39 whose one end is connected to the interlocking arm 32.
It is connected through 40. A rotary speed change arm 41 is welded to the inner portion of the case of the interlocking shaft 35.

On the other hand, as shown in FIG. 2, sliding grooves 2a, 2b are formed by pressing on two mating cases at the rear portion of the transmission case 2, and these sliding grooves 2a, 2b are formed.
The resistance rod 9 and the plowing depth regulating rod 10 are slidably inserted in each of them. A bracket 2c is formed above the rear part of the mission case 2, and a bell crank-shaped link 42 is supported on the bracket 2c so as to be rotatable in the longitudinal direction of the machine body. Further, as shown in FIGS. 1 to 3, one end of the link 42 is formed in a U shape and a long hole 42a is formed in the U shape portion, and the other end is formed. The hole 42b is bored. On the other hand, the resistance rod 9 has a resistance plate 43 fixed to the front end of the fuselage so as to be inclined downward toward the front of the machine body, and the other end thereof is held by the U-shaped portion of the link 42 and the long hole 42a of the link 42. Also, by penetrating through the pin 45, the link 42 is configured to slide in the up-down direction of the machine body. In addition, the link 42 has a hole
A key portion 39a formed at the other end of the rod 39 is rotatably fitted in the rod 42b, and therefore, when pulled by the rod 39, it rotates to slide the resistance rod 9 in the vertical direction of the machine body.

The plowing depth regulating rod 10 has a large number of holes along its longitudinal direction.
.. are formed, a sled member 46 is fixedly provided at one end, and the other end projects upward from the rotary cover 12. Further, a U-shaped bracket 47 is installed at a position facing the restriction rod 10 on the cover 12, and a pin 49 whose one end is bent in a hook shape is fitted to the bracket 47 by attaching a spring 50. The pin-shaped one end of the pin 49 is engaged with the step-shaped stoppers 47a and 47b formed at one end of the bracket 47, respectively. Therefore, pin 49
Is pulled against the spring 50 in the direction opposite to the restricting rod 10 to engage with the stopper portion 47a, and the restricting rod 10 is further slid upward or downward to the hole 10a at an appropriate position, and the stopper portion 47a is removed. The other end of the pin 49 is fitted and fixed, and the regulating rod 10, that is, the sled member 46 is fixed at an appropriate position to set the working depth.

Further, as shown in FIGS. 4 to 6, a rotary shift shaft 51 is disposed so as to be adjacent to the speed change shift shaft 26 and extend over both side surfaces of the transmission case 2. The shift fork 52 is slidably fitted in the. The shift fork 52 is positioned and urged to a predetermined position by a click stop mechanism between the shift fork 52, the shift fork 52, the shift fork 52, the shift fork 52, and the input shaft 13. The rotary shifter gear 53 is engaged.

In FIG. 5, the gear shifter gear 31 engages with the gear 55 to move forward at the first speed F ₁ , and the gear 57 always meshes with the gear 57.
To the forward second speed F ₂ and the gear 60 that is always meshed with the gear 59 to obtain the reverse R, and the rotary shifter gear 53 engages with the gear 61 to rotate in the forward direction S. , The reverse rotation C is obtained by engaging the gear 63 which is always meshed with the gear 62. Furthermore,
The rotation of the traveling transmission system is transmitted to the traveling wheels 5 via the chain and the differential gear, and the rotation of the rotary transmission system is transmitted to the rotary 6 via the chain.

Further, as shown in FIGS. 4 and 6, the handle 7 is mounted so as to sandwich the transmission case 2 by a bracket 65 having a U-shape, and the bracket 65 is mounted so that the rotary shift shaft 51 can be removed. It is being stopped.

Since the present embodiment is configured as described above, the engine 3
Is transmitted to the input shaft 11 in the transmission case 2 part via the belt in the case 15. When the operator moves the speed change lever 16 in the lateral (left and right) direction along the guide groove 20 of the guide plate 19, the left and right movements of the speed change lever 16 move the shift fork 30 through the shifter interlocking shaft 22 and the speed change arm 25.
The fork 30 is slid along the shift shaft 26 and positioned at an appropriate position corresponding to the display of the guide plate. For example, moving to the forward second speed position F ₂ the shift lever 16 from the neutral position N, fork 30 is high speed in order to adapt the cultivator 1 in the non-working traveling along the traveling speed shifter gear 31 engaged with the gear 57 When it moves to the reverse position R, the shifter gear 31 engages with the gear 60 and moves backward. At this time, depending on the left / right movement of the speed change lever 16, the lever 16 is moved to the long hole 32a.
Interlocking arm 32 is not affected by sliding inside,
Held at rotary stop position N _R.

When the speed change lever 16 is positioned at the work neutral position N'of the guide plate 19, the lever 16 is operated vertically (up and down) along the guide groove 20 so that the interlocking arm 32 moves around the shift shaft 26. Rotate vertically. Then, rod 39
Also, the rotary shifter interlocking shaft 35 rotates via the plate 36, the shift fork 52 slides along the shift shaft 51 via the speed change arm 41, and at an appropriate position corresponding to the display of the guide plate. Positioned. For example, the gearshift 16
When is moved from the neutral position N _R to the normal rotation position S, the shift fork 52 engages the shifter gear 53 with the gear 61 to transmit the rotation in the same direction as the forward direction to the rotary 6. At this time, the arm 32 is rotated toward the lower side of the machine body in conjunction with the operation of the shift lever 16, and the arm 32 further moves the rod 39 to the rear side of the machine body so that the rod 39 is linked at its key portion 39a. Rotate 42 toward the rear of the machine. In this state, the link 42
Moves the resistance plate 43 together with the resistance rod 9 toward the lower side of the machine while sliding the pin 45 along the long hole 42a.
The resistance plate 43 bites deeply into the soil and receives a large resistance as the machine runs, and absorbs reaction force from the field by the rotary 6 to prevent dashing. When it moves to the reverse rotation position C, the shifter gear 53 engages with the gear 63 to transmit the rotation in the reverse direction to the forward direction to the rotary 6. In this state, the arm 32 is rotated toward the front of the machine body opposite to the normal rotation of the rotary 6, whereby the rod 39 moves the link 42 to the arm 32.
The resistance rod 9 and the resistance plate 43 are moved toward the upper side of the machine by rotating in the same direction as. Therefore, in this state, the resistance plate 43 does not bite deeply into the soil, and therefore does not receive a large resistance from the field.

Then, with the shift lever 16 moved up or down, the lever 16 is moved laterally along the guide groove 20 to the forward first speed position F ₁ . Then, similarly to the above, the shifter gear 31 is shifted through the shifter interlocking shaft 22, the shift arm 25 and the shift fork 30 so as to engage with the gear 55, and the constant speed rotation suitable for the work is transmitted to the wheels 5. . As a result, the cultivator 1 is rotated with the rotary 6 rotating in the forward or reverse direction.
Moves forward and tillage work is carried out.

It should be noted that in a hard field, since the tilling depth is determined by the resistance rod 9, adjustment by the tilling depth regulating rod 10 having the sled member 46 is not necessary, but in a soft field (field land), depending on the resistance rod 9, the rotary 6 may be used. May not be able to support. In this case, the pin 49 is pulled out from the hole 10a of the working depth regulating rod 10, the regulating rod 10 is manually adjusted, and further fixed at an appropriate position to fix the sled member 46.
By this, tilling work is performed while supporting the rotary 6.

(G) Effect of the Invention As described above, according to the present invention, when the resistance rod 9 and the operating lever 16 provided so as to be movable in the vertical direction are switched to the normal rotation of the rotary 6 by the lever 16, the resistance rod 9 is rotated. Since the resistance rod 9 is raised so that the resistance rod 9 rises when the field is lowered and the mode is switched to the reverse direction, when the cultivating work is performed, the rotary rod is rotated according to the field.
The position of the resistance rod 9 can be automatically set only by operating the lever for switching 16 to the normal rotation and the reverse rotation. Therefore, when the rotary 6 is in the normal rotation, the resistance rod 9 is deeply digged into the soil and the rotary 6 is used. Dashing can be very easily and surely prevented, and the resistance rod 9 can be raised to obtain a predetermined working depth when the rotary reverse rotation is performed without fear of dashing. Even if used by
You can plow safely.

[Brief description of drawings]

FIG. 1 is a perspective view showing a connecting structure of an operating lever and a resistance rod of a tiller according to the present invention, FIG. 2 is a side view thereof, and FIG. 3 is a perspective view showing a resistance rod protruding above a rotary cover. 4 is a side view of the gear shift operating device, FIG. 5 is a sectional view taken along line VV in FIG. 4, FIG. 6 is a sectional view taken along line VI-VI in FIG.
FIG. 7 is a front view showing the guide groove of the guide plate, and FIG. 8 is a front view showing the guide groove partially modified. And FIG. 9 is an overall side view showing a tiller to which the present invention is applied. 1 ... Tiller, 6 ... Rotary, 9 ... Resistance rod, 16 ... Operation lever (shift lever).

Claims (1)

[Claims] 1. A cultivator comprising a rotary unit integrally incorporated in a machine body and comprising an operation lever for switching the rotary mode between normal rotation and reverse rotation, wherein a resistance rod for receiving resistance from the soil can be moved vertically in the machine body. The resistance rod and the operating lever,
A tiller constructed such that the resistance rod descends when the operation lever switches the rotary direction to the normal rotation and the resistance rod rises when the rotary mode switches to the reverse rotation.