JP2878565B2 - Tiller's mission structure - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cultivator transmission structure. 2. Description of the Related Art Conventionally, a transmission case such as a cultivator is disclosed in, for example, Japanese Utility Model Laid-Open Publication No. 53-21906 and Japanese Utility Model Laid-Open Publication No. 54-402. The gear group incorporated in these cases is arranged closer to the rear of the vehicle body than the axle. [0003] In the conventional apparatus described above [0008] are parts were Tsu drawbacks there to be a costly increase because it requires two cases. Also, a removable cable
The gears in the case on the removal side
The configuration of the operation tool becomes complicated, which raises the cost
It is increasing. [0004] The present invention has been proposed in view of the above problems, and therefore, the following technical measures have been taken. That is, a gear group of a traveling system and a gear group of a rotary system are accommodated in front and rear of an upper portion of a transmission case 17 integrally formed in a letter shape in a side view. The gear mechanism is provided close to each other, and the transmission case 17
Shifutaa to shift the Oite these gear mechanism to the upper
Arms 23 and 24 are mounted inside, and the speed is changed outside the case
A pair of cutouts 29 and 30 are provided to engage with the two shaft portions of the lever,
Further, the shaft of the shifter arm connected to the notches 29, 30
Operation by supporting 36 and 37 on the wall of the transmission case 17
Constructs an interlocking mechanism with the front pins 26 and 31 as fulcrums
Middle of front and rear of transmission lever 2 that can be operated in up, down, left and right directions
The part is made to be freely disengageable with the pair of notches 29, 30 to form a transmission structure of a cultivator. An embodiment of the present invention will be described below with reference to an embodiment shown in the drawings. First, the structure will be described. As shown in FIG.
7 and a handle frame 18 projecting rearward at the upper end. The transmission case 17 has a f-shape when viewed from the side, and the case accommodating the gear group of the traveling system and the case accommodating the gear group on the rotary side are integrally formed. It is configured. An axle 20 having wheels 19 is provided at the lower front end of the transmission case 17, and a tilling shaft 22 having tilling claws 21 is provided at the lower rear end. These axles 2 are located above the transmission case 17.
A gear group is provided as a transmission mechanism for transmitting the shaft 0 and the tilling shaft 22 and the like. In the handle frame 18, there are provided shifter arms 23 and 24 for shifting the transmission mechanism, and an interlocking mechanism for operating these shifter arms 23 and 24 by the shift lever 2 at the rear end. Provided. Handle frame 1
The rear bracket 8 has a pair of upper and lower rotating arms 27 and 28 which are rotatable around the pins 26 in the left-right direction. A gear lever is provided at the rear end of each of the rotating arms 27 and 28.
Two notches 29, 30 that can be fitted are provided. The base of the transmission lever 2 is rotatable about the pin 26 and also about a pin 31 which is orthogonal to the pin 26 in the left-right direction, and can be rotated up, down, left and right. The rotating arms 27 and 28 are provided at the protruding portions protruding in the left and right opposite directions, and are provided with the arms 3 of the shifter arms 23 and 24.
2, 33 and rods 34, 35. 36, 3
Reference numeral 7 denotes shafts of 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 face of the handle frame 18, and the operation panel 38 is provided with a traveling speed change groove 7, a tilling switching groove 8, and a tilling operation groove 10 for guiding the operation lever-2. The traveling speed change groove 7 is located at a lower position, and the cultivation switching groove 8 is located at an upper position.
0 is formed. The running speed change groove 7 and the tillage changeover groove 8
May be provided on the opposite side of the upper and lower sides, or the grooves may be arranged in the vertical direction 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. Next, the working speed fixing device 52 for preventing the shift gear at the first speed position 6 adapted to the working speed from being disengaged will be described. On the upper side of the transmission case 17, a lock arm 70 extending over the arms 32, 33 is rotatable around a pin 39 at an intermediate portion between the arms 32, 33. Provide. Lock arm 7 on the arm 33
A cam 40 is provided in the zero portion, and the lock arm 70 is attached and rotated toward the arm 33 by a spring 41 when the arm 33 is transmitted to the neutral position 9. At the same time, the spring 4 is moved between the forward rotation position 15 and the reverse rotation position 16 of the arm 33.
In this case, the lock arm 70 is pushed upward against the position of the lock arm 70. The other end of the lock arm 70 is provided with a notch 42 which can be fitted with the arm 32 (see FIG. 3). Is disabled. The fixing position of the arm 32 fitted and fixed by the notch portion 42 is set to a first speed position 6 adapted to the working speed. [0010] A rotating arm operated by the gearshift lever-2
Traveling operation fixing device 44 for fixing the vehicle 27 to the first speed position 6
Will be described. 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 turning arm 27 for operating and interlocking the traveling shift is set as a turning zone. When the gearshift lever 2 is guided to the tillage operation groove 10 and the tillage switching groove 8, the rotating arm 27 is at the first speed position 6. Here, the lock pin 45 is fitted in the lock hole 48 so that the rotating arm 27 cannot move from the first speed position 6 which is the working speed to another position. A motor 53 mounted on the front of the vehicle body 1;
A transmission between the input shaft 54 of the transmission case 17 and the input shaft 54 has a belt transmission structure that can be turned on and off by a clutch. A clutch shaft 55 that is gear-transmitted from the input shaft 54 includes:
A traveling speed change gear 51 operated by a shifter 64 by the shifter arm 23 is slidably provided in the axial direction. An intermediate shaft 5 is provided around the clutch shaft 55.
6, 57 and the driving transmission shaft 58 are provided. By operating the traveling transmission gear 51 on the clutch shaft 55 in the axial direction, the traveling transmission gear 58 meshes with the first speed gear 59 of the intermediate shaft 56 at the center position, and moves the traveling transmission shaft 58 through the intermediate shaft 57 at a relatively low speed. It is provided to be rotationally driven. When the speed change gear 51 is moved to one side of the first speed position 6, the speed change gear 51 meshes with the speed change gear 60 of the drive transmission shaft 58, and the speed of the drive transmission shaft 58 becomes relatively high. It is provided in such a relation that it can transmit rotation at the adapted second speed. In the position where the gear is moved to the other side of the first speed position 6, 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, thereby transmitting traveling in the reverse direction. It is a configuration to do. The chain is transmitted between the traveling transmission shaft 58 and the axle 20. Tilling transmission shaft 62
The tilling switching gear 63 is configured to transmit from the gear 59 of the intermediate shaft 56 and the gear 61 of the intermediate shaft 57 so as to rotate forward and reverse. When the cultivation switching gear 63 meshes with the gear 59, the cultivation shaft 22 is in a reverse rotation state and cultivates so that the soil surface is cut up from the lower side to the upper side. When the tilling switching gear 63 meshes with the gear 61, the tilling shaft 22 rotates forward. The tilling transmission shaft 62 is provided with a tilling switching gear 63 slidable in the axial direction. The switching gear 63 is operated by a shifter 65 by the shifter arm 24. A cultivation clutch 66 is provided on the cultivation transmission shaft 62 so that the cultivation shaft 22 provided with the cultivation claws 21 is chain-driven. When the shift lever 2 is operated during the traveling shift stroke 3, the shift lever 2 may be moved in the left-right direction only along the traveling shift groove 7. When the speed change lever 2 is at the first speed position 6, it is engaged with the notch 29 of the turning arm 27. The lock pin 45 is located at a position pushed up by the spring 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 arm 33
Due to the relationship between the lock arm 38 and the cam 40, the notch 42 is separated from the arm 32 side. The traveling speed change gear 51 operated by the shifter 64 is engaged with the first speed gear 59 on the intermediate shaft 56 to transmit the rotation of the axle 20 at a speed suitable for tilling work.
When shifting the traveling speed from the first speed position 6 suitable for such work to a high speed traveling speed position suitable for traveling on the road, that is, the second speed position 12, the traveling speed change gear 51 is shifted to the neutral position 11 halfway. The gear is disengaged from the speed gear 59 and becomes a non-transmission state. When the transmission lever-2 is operated to the second speed position 12, the traveling 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 moved to the reverse position 14 beyond the neutral position 13. The transmission gear 51 is disengaged from the first speed gear 59 at the neutral position 13 and meshes with the reverse gear 61 at the reverse position 14. Tillage device 4
When performing tilling by, the gear lever-2 is in the first gear position 6
The running speed is maintained at a relatively low speed because the operation is switched to the tilling switching process 5 from the start. The gearshift lever-2 is moved from the first speed position to the tillage operation groove 1.
Operate to 0 to position to neutral position 9. At this time, the gearshift 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 gearshift lever 2 and engages with the lock pin 48 of the rotating arm 27.
The rotating arm 27 is fixed at the first speed position 6. In this neutral position, the lock arm 70 is at a position separated from the arm 32 on the traveling speed change side. When the transmission 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 moved. Rotate forward. When the tilling shaft 22 rotates forward, the cultivated soil by the tilling claws 21 is relatively rough. When in the forward rotation position 15, the cam 40 is pushed up by the arm 33, and the lock arm 70 is moved to the notch 4
2 is engaged with the arm 32 on the other side, the rotation of the arm 32 around the shaft 36 is stopped, and the traveling speed change gear 51 is not disengaged from meshing with the first speed gear 59. When the transmission lever-2 is operated to the reverse rotation position 16, the transmission to the tilling shaft 22 is temporarily cut off at the neutral position 9 on the way, and then the tilling switching gear 63 is shifted to the gear 5 position.
9 and the tilling shaft 22 is rotated in the reverse direction. Tilling nail 21
The tilled soil is finely crushed by the reverse rotation of. At this time, the lock arm 70 engages the notch 42 with the arm 32 to prevent the traveling speed change gear 51 from being disengaged. As described above, according to the present invention, the gear group of the traveling system and the gear group of the rotary system are accommodated in the front and rear upper portions of the inside of the transmission case integrally formed in the shape of a letter when viewed from the side. Eliminates the need for two cases for accommodating the gear groups of the traveling system and the rotary system as in the conventional case, making it possible to reduce the number of assembling steps and the number of parts, making the entire device inexpensive. it can. [0022] Moreover, provided in a state of running system and the rotary system of the speed change gear mechanism is close to each other Rutotomoni, couriers
Gear shifting mechanism at the top of the case .
The shifter arm inside the case, and
A pair of cutouts are provided on the outside of the gear to engage the shift lever shaft.
The shaft of the shifter arm connected to this notch.
An operation interlocking mechanism is supported by pivoting on the
That can be operated in the up, down, left and right directions with the other pin as a fulcrum.
Since the speed lever is freely disengageable with the pair of notches,
Shift one shift lever provided outside the upper part of the transmission case.
By operating up and down or left and right, the mission case
Either the traveling system or the rotary system supported by the wall
Via the shaft of the arm
Since each transmission can be shifted independently,
The gear shift operation tool inside and outside the gear can be shifted with good balance
You.

[Brief description of the drawings] FIG. 1 is an enlarged perspective view of a main part. FIG. 2 is an enlarged side sectional view of a main part. FIG. 3 is an enlarged side sectional view of a main part. FIG. 4 is a plan view of a main part. FIG. 5 is a side view of the transmission mechanism. FIG. 6 is a power transmission diagram. FIG. 7 is a schematic side view of a cultivator. [Explanation of symbols] 1 Body 2 Shift lever 3 Travel shifting process 4 Tillage device 5 Tillage switching process 6 1st gear position 7 Running gear groove 8 Tillage switching groove 10 Tilling operation groove 12 Second gear position 14 Reverse position 15 Forward rotation position 16 Reverse rotation position 17 Mission Case 27 Rotating arm 44 Traveling operation fixing device 49 Traveling operation interlocking mechanism 51 Travel gear 52 Work speed fixing device

Claims (1)

(57) [Claims] In a gear case in which a traveling system gear group and a rotary system gear group are housed in front and rear of an upper portion of a transmission case integrally formed in a letter shape in side view, the traveling system and the rotary system transmission gear mechanism are included in the gear group. A shifter arm for shifting these transmission gear mechanisms at the upper part of the transmission case is mounted inside the case.
The outside of the case has a pair of cutouts that engage the transmission lever shaft.
Notch, and the shaft of the shifter arm connected to this notch
Is supported by the mission case wall to form an interlocking mechanism.
And can be operated up, down, left and right using the front pin as a fulcrum.
A transmission structure for a cultivator , wherein a speed change lever to be engaged is detachably engaged with the pair of notches .