JP2658016B2 - Transmission operating device for cultivator - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a speed change device for a cultivator.

[Prior art] When a traveling speed of a cultivator is high, such as a road traveling speed, a traction control mechanism is provided for stopping a rotation transmission of a tilling device in conjunction with a shift operation to the road traveling speed. There is.

[Problems to be Solved by the Invention] In the above-described shifting operation mode of the cultivator, it is necessary to stop the rotation transmission of the tilling device by shifting the speed to the road running speed. Is disadvantageous in that the mechanism is complicated and entanglement tends to occur.

[Means for Solving the Problems] The present invention has been proposed in view of the above-mentioned drawbacks, and has a low-speed position 6 in which the traveling speed of the vehicle body 1 is adapted to the tilling work.
And a traveling shift stroke 3 of the shift lever 2 for switching to a high-speed position 12 higher than the low-speed position 6 and adapted to the road traveling speed.
On the other hand, a tilling switching step 5 for switching the tilling device 4 between forward rotation and reverse rotation by operating the transmission lever 2 is provided, and at a low speed position 6 of the traveling transmission step 3, the transmission lever 2 is moved to the tilling switching step. 5 is a structure of a speed change device of a cultivator which is provided so as to be movable to a neutral position.

[Operation of the Invention] By operating the transmission lever 2 during the traveling speed change process 3, it is possible to perform a speed change operation such as operating the traveling speed of the vehicle body 1 to a working speed or operating a high speed road traveling speed position. When performing the tilling operation by the tilling device 4, the shift lever 2 is selectively operated from the low-speed position 6 of the traveling shift stroke 3 through the neutral position of the tilling switching stroke 5 to the normal rotation or the reverse rotation. Thus, the rotation can be performed in both forward and reverse rotations of the rotation direction of the tillage device 4.

[Effects of the Invention] As described above, the shift lever 2 may be operated only in the traveling shift stroke 3 when traveling only without plowing while having a single operation lever form. In addition, tillage device 4
When the tilling is performed, the tilling device 4 must be operated from the low-speed position 6 of the traveling shift stroke 3, so that the tilling device 4 is not driven and rotated at a high speed such as a road running speed. It can be done safely.

Moreover, the speed change lever 2 communicates with the neutral position of the tilling switching process 5 at the low-speed position 6, and the forward or reverse rotation switching operation of the tilling switching process 5 is performed via the neutral position. This eliminates the need for a mechanism that is interlocked with the check, thus simplifying the operation mechanism.

In addition, since it is not possible to perform the operation from the speed change position such as the road running position other than the low speed position 6 to the tilling switching process 5, the operation is safe and the operation is easy.

[Invention of the Embodiment] In the traveling speed change step 3, a road traveling speed position 12 is provided on one side from a low speed position 6 via a neutral position 11,
The reverse position 14 is provided on the other side via the neutral position 13, and the tilling switching process 5 is configured such that the forward rotation position 15 is provided on one side from the neutral position 9 and the reverse rotation position 16 is provided on the other side. .

In the case of such a configuration, the shift lever 2 is operated from the low-speed position 6 of the traveling shift process 3 to the road traveling speed position 12 via the neutral position 11 on one side and the neutral position 13 on the other side. After that, it is operated to the reverse position 14. Further, in the operation of the transmission lever 2 in the tilling switching step 5, the tilling transmission is operated from the neutral position 9 to the forward rotation position 15 on one side, and the tilling device 4 is rotated in the reverse direction to perform tilling. Is operated to the reverse rotation position 16 to rotate the tillage device 4 in the reverse direction to perform plowing. For this reason, although the shift lever 2 is operated from the working position 6 to the tillage switching groove 8,
From the low speed position 6 to the road traveling speed position 12, and the reverse position 14
In addition to the operation to the tilling, the neutral position 11, 13, and 9 can be used for the tilling normal rotation position 15 and the reverse rotation position 16 for safe operation.

Further, the transmission lever 2 was operated to the low-speed position 6 between the tilling operation interlocking mechanism 50 for operating the switching of the forward and reverse rotation transmission of the tilling device 4 and the traveling operation interlocking mechanism 49 for shifting the traveling speed. A working speed fixing device 52 is provided to prevent the disengagement by maintaining the meshing transmission state of the traveling transmission gear 51.

In such a configuration, when the shift lever 2 is moved to the low-speed position 6 of the traveling shift stroke 3 and then operated to the forward rotation position 15 or the reverse rotation position 16 of the tilling switching step 5, the traveling transmission gear 51 The transmission is moved from the forward rotation position 15 or the reverse rotation position 16 by being temporarily deviated from the operation position by the traveling operation interlocking mechanism 19 and by switching the transmission mechanism on the side of the tillage device 4 by the tillage operation interlocking mechanism 50. The low-speed position 6 of the transmission gear 51 in such a state is maintained by the working speed fixing device 52 to maintain the meshing transmission state and prevent the transmission gear 51 from being disengaged. Accurate transmission can be performed.

Further, the rotation arm 27 of the traveling operation interlocking mechanism 49 which is rotated along the traveling transmission groove 7 by the engagement of the transmission lever 2 is operated from the low speed position 6 of the transmission lever 2 to the tilling operation groove 10. And a traveling operation fixing device 44 for fixing the vehicle.

In the case of such a configuration, the shift lever 2 is temporarily disengaged from the rotating arm 27 of the traveling operation interlocking mechanism 49 by being operated from the low speed position 6 of the traveling transmission groove 7 to the tilling operation groove 10. However, the rotating arm 27 at the low speed position 6
It is fixed by the traveling operation fixing device 44. For this,
The traveling operation interlocking mechanism 49 including the rotating arm 27 maintains the working speed transmission state position at which the traveling transmission gear meshes. Therefore, when the transmission lever 2 is returned from the tillage operation groove 10 to the traveling transmission groove 7, the transmission lever 2 is moved to the rotation arm 27 at the low speed position 6.
Can be engaged accurately.

[Example] In the illustrated example, the vehicle body 1 includes a transmission case 17 and a handle frame 18 projecting rearward at an upper end thereof.
And the main subject. The transmission case 17 is formed in a letter shape in a side view, and a wheel 20 having a wheel 19 is provided at a front lower end portion,
A tilling shaft 22 provided with a tilling claw 21 is provided at the lower rear end. A transmission mechanism for transmitting the axle 20 and the tilling shaft 22 and the like is provided above the transmission case 17.

In the handle frame 18, there are provided shifter arms 23 and 24 for shifting the transmission mechanism, and an interlocking mechanism for operating the shifter arms 23 and 24 by the shift lever 2 at the rear end. Handle frame 18 Rear end bracket 25
Is provided with a pair of upper and lower rotating arms 27 and 28 that are rotatable around the pin 26 in the left-right direction. Notches 29, 30 into which the transmission lever 2 can be fitted are provided at the rear ends of the rotating arms 27, 28. The base of the speed change lever 2 is rotatable about the pin 26 and also about a pin 31 orthogonal to the pin 26 in the left-right direction, and can be turned in any direction up, down, left, and right. The rotating arms 27 and 28 are provided at protruding portions projecting in opposite directions to the left and right.
The arms 32, 33 of the shifter arms 23, 24 are connected by rods 34, 35. Reference numerals 36 and 37 denote shafts of the shifter arms 23 and 24, which are provided rotatably with respect to the upper end of the transmission case 17.

An operation panel 38 is provided on the rear end surface of the handle frame 18, and the operation panel 38 is provided with a traveling speed change groove 7 for guiding the operation lever 2, a cultivation switching groove 8, a cultivation operation groove 10, and the like. The traveling speed change groove 7 is on the lower side and the cultivation switching groove 8 is on the upper side.
Is formed.

The running speed change groove 7 and the tillage switching groove 8 may be provided upside down, or the grooves may be arranged vertically so as to be located in the left and right direction. In this case, the tilling operation groove 10 is in a state along the left-right direction.

The working speed fixing device 52 for preventing the shift gear at the low speed position 6 from being disengaged is as follows. Transmission case 17
The lock arm 70 over the arms 32 and 33
Are provided rotatably around a pin 39 at an intermediate portion between the arms 32 and 33. A cam 40 is provided on the arm 33 of the lock arm 70, and when the arm 33 is transmitted to the neutral position 9,
The lock arm 70 is mounted and rotated toward the arm 33 by the spring 41. At the same time, the forward rotation position 15 of the arm 33 is
And the reverse rotation position 16, the lock arm 70 against the spring 41.
Is pushed upward. At the other end of the lock arm 70, a notch 42 that can be fitted to the arm 32 is provided.
By fitting the 42 to the arm 32, the rotation of the arm 32 is disabled. The fixed position of the arm 32 fitted and fixed by the notch 42 is set at the low-speed position 6.

The traveling operation fixing device 44 for fixing the rotating arm 27 operated by the shift lever 2 to the low-speed position 6 is as follows. The bracket 25 is provided with a lock pin 45 slidable in parallel with the pin 26, and the lock pin 45 is pressed against a spring 47 by a projection 46 of the transmission lever 2. Opposite to the lower end of the lock pin 45, a lock hole 48 at the base of the rotary arm 27 for operating and interlocking the traveling speed change is set as a rotation zone. When the transmission lever 2 is guided in the tillage operation groove 10 and the tillage switching groove 8, the rotating arm 27 is at the low speed position 6. Here, the lock pin 45 is fitted into the lock hole 48, and the rotation arm 27 cannot move from the low speed position 6 to another position.

The prime mover 53 mounted on the front of the vehicle body 1 and the transmission case 17
And a belt transmission structure capable of on-off transmission between the input shaft 54 and a clutch. A traveling transmission gear 51, which is operated by a shifter 64 by the shifter arm 23, is provided on a clutch shaft 55 that is gear-transmitted from the input shaft 54 so as to be slidable in the axial direction.

Around the clutch shaft 55, intermediate shafts 56 and 57 and a traveling transmission shaft 58 are provided. By operating the traveling transmission gear 51 on the clutch shaft 55 in the axial direction, at the neutral position, the traveling transmission gear 51 meshes with the working speed gear 59 of the intermediate shaft 56, and the traveling transmission shaft 58 is relatively moved via the intermediate shaft 57. Provided to transmit rotation at low speed.
In a position where the transmission gear 51 is moved to one side of the low-speed position, the transmission gear 51 meshes with the transmission gear 60 of the traveling transmission shaft 58,
The traveling transmission shaft 58 is provided in such a relationship that the traveling transmission shaft 58 can be rotationally transmitted at a relatively high speed. In the position where the shift operation is performed to the other side of the low-speed position, the transmission gear 51 meshes with the gear 61 of the intermediate shaft 57 to rotate the traveling transmission shaft 58 in the reverse direction to transmit traveling in the reverse direction. is there. Between the traveling transmission shaft 58 and the axle 20, a chain transmission is provided.

The tilling switching gear 63 of the tilling transmission shaft 62 is
The transmission is configured to switch from the gear 59 to the gear 61 of the intermediate shaft 57 to rotate forward and reverse. When the switching gear 63 meshes with the gear 59, the tilling shaft 22 is in a reverse rotation state, and tills so that the soil surface is cut up from the lower side to the upper side. Switching gear 63
When the gear meshes with the gear 61, the tilling shaft 22 is in the forward rotation transmission.

The tilling transmission shaft 62 is provided with a tilling switching gear 63 slidably in the axial direction. The switching gear 63 is connected to the shifter arm
Operated by a shifter 65 by 24. On the tilling transmission shaft 62, a tilling clutch 66 is provided, and the tilling shaft 22 on which the tilling claws 21 are disposed is configured to be transmitted in a chain transmission.

When the shift lever 2 is operated in the traveling shift stroke 3, the shift lever 2 may be moved in the left-right direction only along the traveling transmission mechanism 7. When the shift lever 2 is at the low speed position 6, the shift lever 2 is engaged with the notch 29 of the rotating arm 27. Lock pin 45 is spring
It is in the position pushed up by 47 and is out of the lock hole 48 of the rotating arm 27. Further, the tilling switching gear 63 is in the neutral position, and the notch 42 is separated from the arm 32 due to the relationship between the arm 33 and the cam 40 of the lock arm 70. The traveling transmission gear 51 operated by the shifter 64 is
The axle 20 is meshed with the working speed gear 59 on the intermediate shaft 56 to rotate and transmit the axle 20 at a speed suitable for tilling work.

When the traveling speed is shifted from the low speed position 6 to the high traveling speed position 12 such as when traveling on a road, the traveling speed change gear 51 is disengaged from the working speed gear 59 at the neutral position 11 on the way. As a result, a non-transmission state is established. Shift lever 2
Is operated to the traveling speed position 12, the transmission gear 51 meshes with the transmission traveling gear 60 to transmit the axle 20 at high speed.

In order to travel backward, the shift lever 2 is operated to the reverse position 14 beyond the neutral position 13. The transmission gear 51 is in the neutral position
At 13 the gear is disengaged from the working gear 59 and at the reverse position 14 the reverse gear
It is in mesh with 61.

When the tilling device 4 performs tilling, the shift lever 2 is operated from the low-speed position 6 to the tilling cutting stroke 5, so that the traveling speed is in a relatively low-speed traveling state.

The shift lever 2 is operated from the low-speed position 6 to the tillage operation groove 10 to be positioned at the neutral position 9. At this time, the shift lever 2 is disengaged from the notch 29 of the turning arm 27 and engages with the notch 30 of the turning arm 28 of the tilling operation interlocking mechanism 50. The lock pin 45 is pushed down by the speed change lever 2 and engages with the lock hole 48 of the rotating arm 27 to move the rotating arm 27 to the low speed position 6.
Fixed to In this neutral position, the lock arm 70 is at a position separated from the traveling speed-side arm 32.

When the speed change lever 2 is operated to the forward rotation position 15 of the cultivation switching groove 8, the cultivation switching gear 63 is engaged with the gear 61 via the cultivation operation interlocking mechanism 50 and the shifter 65, and the cultivation shaft 22 is rotated forward. When the tilling shaft 22 rotates forward, the cultivated soil by the tilling claws 21 is relatively rough. When in such a forward rotation position 15, the cam 40 by the arm 33 is pushed up, and the lock arm 70 engages the notch 42 with the arm 32 on the other side, and the arm 32 rotates around the axis 36. Stop the rotation and move
Is not disengaged from the engagement with the working speed gear 59.

When the shift lever 2 is operated to the reverse rotation position 16,
At the neutral position 9 on the way, after the transmission to the tilling shaft 22 is once turned off, the tilling switching gear 63 is meshed with the gear 59,
The tilling shaft 22 is transmitted in reverse rotation. By the reverse rotation of the tilling claw 21, the cultivated soil is tilled in a crushed state. At this time, the notch 42 of the lock arm 70 is fitted to the arm 32 to prevent the traveling transmission gear 51 from being disengaged. The transmission lever 2 has winding portions 67, 67 fitted on the left and right ends of the pin 31, and a rear action portion 69 of a spring 68 having a front portion locked to the bracket 25 abuts on the upper side of the transmission lever 2. It is biased downward.

[Brief description of the drawings]

FIG. 1 shows an embodiment of the present invention. FIG. 1 is a partially enlarged perspective view, FIG. 2 is a partially enlarged side sectional view, FIG. 3 is a partially enlarged side sectional view, FIG. 4 is a partial plan view, FIG. 5 is a side view of the transmission mechanism, FIG. 6 is a plan view thereof,
FIG. 5 is a side view of the transmission mechanism, FIG.
The figure is a side view. In the figure, reference numeral 1 denotes a vehicle body, 2 denotes a shift lever, 3 denotes a traveling shift stroke, 4 denotes a tilling measure, 5 denotes a tilling switching stroke, 6 denotes a low-speed position,
7 is a traveling speed change groove, 8 is a tilling switching groove, 9 is a neutral position, 10 is a tilling operation groove, 11 is a neutral position, 12 is a road traveling speed position, 13 is a neutral position, 14 is a reverse position, and 15 is a forward rotation position. , 16 is a reverse rotation position, 27 is a rotating arm, 44 is a traveling operation fixing mechanism, 49 is a traveling operation interlocking mechanism, 50 is a tilling operation interlocking mechanism, 51 is a traveling transmission gear, and 52 is a working speed fixing device.

Claims (2)

(57) [Claims] 1. A traveling shift stroke 3 of a transmission lever 2 for switching a traveling speed of a vehicle body 1 between a low speed position 6 adapted to tilling work and a high speed position 12 higher than the low speed position 6 and adapted to road traveling speed. On the other hand, a tilling switching process 5 for switching the tilling device 4 between forward rotation and reverse rotation by operating the transmission lever 2 is provided.
A shift operating device for a tiller, wherein the shift lever 2 is provided so as to be movable to a neutral position of the tillage switching process 5. 2. The traveling speed change step 3 includes a high-speed position adapted to traveling on a road from a low-speed position 6 to a side through a neutral position 11.
12 and the reverse position via the neutral position 13 on the other side
The tilling switching process 5 is provided with a forward rotation position 15 on one side from the neutral position 9 and a reverse rotation position 16 on the other side.
The speed change device for a cultivator according to claim 1, further comprising: