JPH04218432A - Continuously variable transmission device in rice transplanter - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuously variable transmission device for a rice transplanter.

0002

2. Description of the Related Art Conventional rice transplanters use a continuously variable transmission device as a wheel drive device using a so-called split pulley, which uses a split pulley on either the driving side or the driven side. When the planting part rises during turning, the split pulley is split and the speed becomes low, allowing smooth turning. According to the conventional system described above, when moving forward for high-speed planting, if you want to replenish seedlings in the field, you step on the main clutch pedal to stop the machine, but when the next time you take off, you change gears to the forward state for high-speed planting. Since the planting part has not risen since the vehicle stopped with the vehicle in the up position, the continuously variable transmission mechanism is maintained on the high speed side, and therefore the vehicle will start at high speed, so the operation is to move the gear shift lever to the low speed side and then start the vehicle. Is required. Also, if the machine falls into a large recess in the tiller during planting work, increasing the running load and causing the engine to stop, the conventional model has a continuously variable transmission mechanism that maintains the high speed side, so the engine cannot be stopped. There was a problem where the engine would stop again after restarting and connecting the main clutch. Therefore, Utility Model Application No. 153388/1983 was proposed with the aim of creating a rice transplanter that can start at low speed at all times. In other words, a continuously variable transmission consisting of a split pulley and a belt is installed between a driving side and a driven side as a wheel drive device, and the continuously variable transmission shifts to a low speed side in conjunction with main clutch operation. It has been constructed as possible. According to this technical means, the continuously variable transmission mechanism is always guided to the low speed side when the main clutch pedal is stepped on, so smooth starting at low speed is always possible, and there are no problems such as seedling collapse and engine stalling when starting. can be resolved.

0003

[Problems to be Solved by the Invention] According to the conventional system described above, it is possible to start at a low speed at all times, but guiding the continuously variable transmission mechanism to the low speed side is done only by depressing the main clutch pedal. Great care is required when operating the pedals.

0004

[Means for Solving the Problems] Therefore, the technical problem of the present invention is to obtain a continuously variable transmission device for a rice transplanter that can always maintain a low speed start and switch the continuously variable transmission device between high and low speeds by operating a lever. The technical means of the present invention to solve this technical problem is to connect a continuously variable transmission device consisting of a split pulley and a belt between a driving side as a wheel drive device and a driven side. In the case where the transmission is extended to It consists of an auxiliary member that interlocks with the high/low speed switching shifter, which is configured so that the sub-shift lever can be moved slowly and manually by the auxiliary member to the planting high speed side. This is a continuously variable transmission device for a rice transplanter, characterized in that the rice transplanter is configured such that the auxiliary member automatically moves quickly toward the low speed side for planting.

[0005]

[Function] It is possible to always maintain a low speed start and to directly operate the lever to switch between high and low speeds of the continuously variable transmission, eliminating the need to pay close attention to the operation of the main clutch.

[0006]

Embodiments The embodiments shown in the drawings will be described below. First, the entire riding-type rice transplanter will be explained. In FIG. 9, 1 is a passenger vehicle body, and a planting section 3 is connected to the rear of this passenger vehicle body 1 via a lift mechanism 2. An engine 5 is mounted on the body frame 4, and a front wheel 6 is mounted below the engine 5.
There is. Reference numeral 7 denotes a transmission case, and there are transmission cases 8 on both left and right sides of the transmission case, and a rear wheel 9 is provided at the rear end of the transmission case 8. 10 is a driver's seat, 11 is a footrest, and 12 is a steering wheel. A top link 13 and a lower link 14 of a link frame are attached to the lift mechanism 2, and the planting section 3 is raised and lowered by swinging the links 13 and 14 by expansion and contraction of a hydraulic cylinder. The planting section 3 consists of a seedling stand 15, a float 16, and a transmission case 17. Also, 18 is a rotary case, 1
9 Planted arms are shown. The above transmission device will be explained based on FIG. 10. The engine 5 drives the pulley 22 via the pulley 20 and the belt 21, and the pulley 22a is further driven via the pulley 20a and the belt 21a. Pump 23 is driven. This hydraulic pump 23
This is to send hydraulic oil to the elevating and lowering parts of the planting section. A split pulley 25 is also provided on the shaft 24 of the pulley 22.
From this, the split pulley 27 is driven via the belt 26. Split pulley 27 also drives shafts 29 and 30 with a gear mechanism within transmission case 7 via main clutch 28 . Note that the shaft 30 indicates a planting drive shaft. Further, 94 is a sliding gear operated by the main shift lever 68, 98 is a reverse gear, and 99
indicates an interstitial transmission gear. A gear 31 driven by a gear mechanism in the mission case 7 drives a propeller shaft 32,
The front wheel 6 is connected via the differential gear mechanism 33 and 34 in the death case.
and the rear wheels 9 are driven. Reference numeral 35 indicates a gear mechanism within the transmission case 8 for driving the rear wheels, and reference numerals 36 and 37 indicate drive shafts for the front and rear wheels. Note that 38 is a tension pulley of the belt 21, and 22 is a counter pulley.

Next, a continuously variable transmission as described above in which an operating mechanism for moving the split pulley is provided between the driving side split pulley 25 and the driven side split pulley 27 will be described. That is, in FIG. 5, reference numeral 39 denotes a continuously variable transmission case, which is divided into two parts.A drive shaft 40 and a driven shaft 41 are mounted on this case 39, and one of the drive shafts 40 is connected to the input side 42. The other side is the PTO shaft side 43, and the PTO shaft can also drive a car wash pump. This drive shaft 40
The pulley 25 shown in FIG. 10 is mounted on the shaft, and the driven shaft 4
A clutch 28 and a driven pulley 27 as shown in FIG. However, the clutch 28 is provided on the movable pulley 27b side. And the drive shaft 40
Shift servo pulleys 44 and 45 are further mounted between the drive shaft 41 and the driven shaft 41, and the pulley 44 has a larger diameter than the pulley 45, and the pulley 45 is accelerated. A bearing 47 is interposed between the servo plate 46 which has a boss screwed into the boss of the pulley 44 and the boss of the movable pulley 25a, and the boss of the movable pulley 25a is inserted into the boss of the speed change servo pulley 44, You can come and go as you like. However, the movable pulley 25a is fitted with a spline 49 on the shaft 40. In addition, there are brake plates 50 and 51 sandwiching the speed change servo plate 46, and one brake plate 5
0 is fixed to a rotary pulley 52, and the rotary pulley 52 is externally fitted through a bearing 53 into a case 54 that is movable left and right. Further, the other brake plate 51 is attached to the inner wall of the case 54 facing the brake plate 50 of the case 54. The case 54 is moved left and right by a switching shifter 55. The above-mentioned pulley 45 has a pulley 56 integrally formed therewith.
The pulley 56 is configured to have a larger diameter than the pulley 45,
The rotating pulley 52 is driven by a timing belt 57. Additionally, a spring 59 is stretched between the outside of the clutch housing 58 and the movable pulley 27b. Also, a rotating pulley 52 and a corresponding pulley 56
have the same diameter. Further, 68 in FIG. 9 is the aforementioned main shift lever.

Now, when the switching shifter 55 is operated and the brake plate 50 is brought into contact with the speed change servo plate 46, the pulley 52 is connected to the pulleys 44, 45, 56 and the timing belt 5.
Since the speed is increased through the screw 48, it is rotating faster than the pulley 44, and therefore the speed change servo plate 46 also rotates with the pulley 52 to increase the speed.
Due to the rotation difference between the pulley 44 and the speed change servo plate 46, the screw pitch naturally returns to slowly move the movable plate 25a from low speed to high speed. Next, the switching shifter 5
When the brake plate 51 is brought into contact with the speed change servo plate 46 at step 5, the brake plate 50 is separated from the speed change servo plate, and the case 54 is fixed after being moved relative to the speed change case 39, so the brake plate 51 is connected to the speed change servo plate. 46
will be fixed. Even though the speed change servo plate is fixed, the pulley 44 is still rotating, so the rotation difference causes the pulley 2 to move quickly from high speed to low speed.
5a will move. The stroke of the switching shifter 55 is controlled by applying it to the transmission case 39 as shown in FIG. 6C. Further, the speed change servo plate 46 has a fan hole 60 as shown in FIGS. 6A and 6B to remove frictional heat between the speed change servo plate 46 and the brake plate. Others, 6
1 is a separate boss provided at the end of the output shaft 41 of the transmission case 39, and the shaft 29 in FIG. 10 is coupled to the output shaft 41 here. Furthermore, in FIGS. 7 and 8, when the clutch pedal 62 is depressed, the clutch arm 64 is actuated via the rod 63.
The clutch 28 is disengaged via the clutch shaft 41a, and the daytent release member of the planting lift lever shown in FIG. 1 is moved in the release direction via a wire 65 from the clutch arm 64. When the power goes off, the continuously variable transmission switches to a lower speed. Because of the above, the continuously variable transmission can be switched to the low speed side in conjunction with the main clutch operation, so smooth starting at low speed is always possible, and problems such as seedling collapse and engine stalling when starting can be eliminated. Further, by operating the wire 67 from the wire 65 via the connecting plate 66, the seedling clutch lever can also be operated. Therefore, when the seedling transfer clutch lever is operated conversely, the main clutch 28 is turned OFF, and both the traveling and planting drives of the rice transplanter can be turned off at once. When it is necessary to turn off the drive, it can be turned off at once without having to operate each drive individually.

[0009] The present invention provides a continuously variable transmission device in which a continuously variable transmission device consisting of a split pulley and a belt as described above is stretched between a driving side as a wheel drive device and a driven side. The auxiliary gear lever that operates the high/low speed switching shifter can be operated. That is, in FIG. 1, the lever 78 of the high/low speed switching shifter 55 is connected to the connection point 7
A spring 77' is attached at 9, and a rod 76 at the upper end thereof is pivoted 77 to a metal fitting of the sub-shift lever 75. Further, a spring 80 with one end fixed to the frame is attached to the upper end of the lever 78 pivoted at 97.
This constitutes an auxiliary member. The auxiliary speed change lever 75 is pivotally supported on a metal fitting 86 together with the planting lift lever 74, and has a hook shape as a whole and has a bent portion 7 attached to the planting lift lever 74.
5a can be engaged. Planting lift lever 7
A fan-shaped plate 95 that swings together with 4 has a plurality of grooves 84 for high speed H, low speed L, descending D, neutral N, and ascending UP, and the base end of the link lever 81 having the roller 101 that engages with this groove is connected to the frame metal fitting 91. A spring 100 fixed to the frame is connected to the other end 90. An arm 82 is fixed to the link lever 81, and a wire 65 operated by the main clutch pedal 62 is connected to a metal fitting 83 of the arm 82. In addition, a wire 87 is connected between the pin 96 of the planting lifting lever 74 and the frame support 88.

Now, when the planting lift lever 74 is moved from the low-speed planting position to the high-speed planting position in FIG. (See FIG. 2), the lever 78 is rotated to the right via the rod 76 and the spring 77', and the shifter 55 is moved to move the continuously variable transmission from low speed to high speed. In this case, since the spring 80 acts on the lever 78, the sub-shift lever 75 and the planting lift lever 74 can be operated slowly, allowing smooth planting work. next,
When you want to switch the continuously variable transmission from high speed to low speed, the auxiliary speed change lever 7 is moved by the spring 77' together with the planting lift lever 74.
5 to the left in FIG. Then, spring 8
With the elastic force of 0, the lever 78 rapidly moves to the left, thereby switching the shifter 55 from high speed to low speed. Next, when the shifter 55 is on the high speed side and high speed planting is being done,
When the main clutch pedal 62 is depressed, the link lever 82
rotates in the direction of the arrow in FIG.
5 becomes free, and therefore the planting lift lever 74 also becomes free, so the sub-shift lever 75 that was engaged with it becomes free.
The spring 80 automatically follows and shifts, and the shifter 55 also moves the continuously variable transmission from high speed to low speed in the same manner as described above. At this time, the force of the spring 80 acts quickly to move to the low speed side, and the auxiliary speed change lever 75 is configured to stop at the low speed position due to the working length of the rod 76. When the action of the main clutch pedal ceases, the link lever 81 is restored by the spring 100, and the roller 10
1 will fit into the low speed groove 84 and will be ready for the next start. The planting lift lever 74 moves along the guide groove 93 of the guide plate 92 shown in FIG. 4, but when the seedling clutch lever is operated, the main clutch 28 is turned off.
At the same time, as described above, the day tent mechanism is released and the planting lift lever 74 is moved to the neutral position by its spring 87 and stopped, and both the traveling and planting drives of the rice transplanter are turned off at once. In this case, the sub-shift lever 75 stops at the low speed position as described above, and thereafter separates from the planting lift lever 74, and the planting lift lever is moved by the spring 87.
It rotates to the neutral stop position. The main shift lever 68 can be operated by moving the moving gear 94 shown in FIG. 10 in the gear transmission 7 to shift between H and L.
The sub-shift lever 75 in the continuously variable transmission is also shifted between H and L, but when driving, the sub-shift lever is set to L and the main shift lever is set to H, and when planting, the sub-shift lever is set to H, L
When the main shift lever 68 is set to the L position, the main shift lever 68 is moved forward at three forward speeds. In addition, the link ratio of the distance α1 from the pivot point 89 of the link lever 81 to the roller 101 and the distance α2 from the pivot point 89 to each groove 84 (the one shown is for high speed) is the link ratio from L to H side. The ratio is set high so that the planting lift lever towards the high speed side cannot be operated carelessly.

[0011]

[Effects of the Invention] According to this technical means, the movement of the sub-shift lever that operates the high/low speed switching shifter of the continuously variable transmission toward the high speed planting side is energized toward the low speed planting side. The auxiliary member that works with the high-low speed switching shifter allows for slow operation, and the auxiliary member automatically moves quickly toward the low-speed side for planting, so lever operations are not complicated and the main clutch can be moved quickly. No need to pay close attention to operation.

[Brief explanation of the drawing]

[Fig. 1] Diagram explaining the operation of the device of the present invention

[Fig. 2] Diagram explaining the operation of the device of the present invention

[Fig. 3] Side view of the device of the present invention

[Figure 4] Plan view showing the guide plate of the planting lift lever

[Figure 5
]Cross-sectional view of continuously variable transmission

[Fig. 6] Plan view A and cross-sectional view B of the speed change servo plate, and partial view H of the switching shifter stroke regulating device.

[Figure 7]
Plan view of continuously variable transmission case

[Figure 8] Partially cutaway front view of the continuously variable transmission case

[Figure 9] Front view of rice transplanter

[Figure 10] Transmission mechanism diagram

[Explanation of symbols]

5 Engine 7 Mission 25 split pulley 27 Split pulley 28 Clutch 39 Continuously variable transmission case 40 Drive shaft 41 Driven shaft 44 Pulley 45 Pulley 46 Speed change servo plate 52 Pulley 55 Switching shifter 56 Pulley 65 wire 74 Planting lift lever 75 Sub-shift lever 76 Rod 77' spring 78 Lever 80 Spring 81 Link lever 95　Fan-shaped board 101 Koro

Claims (2)

[Claims] [Claim 1] A continuously variable transmission consisting of a split pulley and a belt is installed between a driving side as a wheel drive device and a driven side, in which a high/low speed switching shifter of the continuously variable transmission is provided. A sub-shift lever to be operated, a day tent release member for a planting lift lever that is linked to the main clutch pedal,
It consists of an auxiliary member that works in conjunction with the high-low speed switching shifter that is energized toward the low-speed planting side, and by these, the sub-shift lever can be moved slowly and manually by the auxiliary member toward the high-speed planting side. A continuously variable transmission device for a rice transplanter, characterized in that it is configured to be movable, and configured to automatically move quickly toward the low speed side for planting using the auxiliary member when moving to the low speed side for planting. 2. The continuously variable transmission device for a rice transplanter according to claim 1, wherein the daytent release member of the planting lift lever is configured to be interlocked so as to be operated to the release side by a main clutch pedal.