JPH0119620Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention uses two belts with different transmission ratios to transmit power from the engine to the wheels and seedling planting device in a riding-type rice transplanter. The present invention relates to a speed change operation device when using a speed change mechanism of the type.

[Problems that conventional technology and ideas try to solve]

Conventionally, in belt-type transmission mechanisms using two belts with different transmission ratios, for example,
As stated in the publication, the tension pulleys for each of both belts are configured to be biased away from the belt by a spring, so power can be transmitted by separating the tension pulley from the belt. The cutting operation can be easily performed with extremely light force, but in order to press the tension pulley against the belt and transmit power, it is necessary to move the tension pulley away from the belt as described above. The belt must be pressed under tension while resisting the biasing spring; in other words, operations involving power transmission must be performed against the resultant force of the spring force and belt tension. As a result, the power transmission operation became extremely difficult and the speed change operation performance of the rice transplanter deteriorated.

The present invention aims to solve this problem.

[Means to solve the problem]

In order to achieve this object, the present invention provides a rice transplanter comprising an engine in the front part of a running vehicle body supported by wheels and a seedling planting device in the rear part of the machine body. Two belts with different transmission ratios are wound around the wheels and an input shaft that is linked to the seedling planting device, and two tension pulleys are in contact with each of the first belt and the second belt. and a spring is provided on each of the tension pulleys to press the belt into contact with the belt and urge the tension pulley to enter power transmission, and the tension pulley is moved against the urging force of the spring. An interlocking mechanism is provided to set the power transmission off position away from the belt, and these interlocking mechanisms are arranged such that when one tension pulley is in the power transmission on position, the other tension pulley is in the power transmission on position, and one tension pulley is in the power transmission on position. A switching mechanism is provided for switching the tension pulley so that when the tension pulley is in the power transmission on position, the other tension pulley is in the power transmission on position.

[Functions and effects of the idea]

With this configuration, in order to turn the tension pulley into power transmission mode, a spring force that biases the tension pulley in the direction of power transmission mode is used.
While this can be done easily with a very light force, when the tension pulley is turned off, the tension of the belt acts in a direction that cancels out the biasing force of the spring. When operating the tension pulley in the state, the operating force is obtained by subtracting the tension of the belt from the biasing force of the spring. Since the sum of the biasing force of the spring and the tension of the belt can be prevented from opposing each other, it is possible to turn the tension pulley on and off the power transmission with a light force.

As a result, according to the present invention, it is possible to improve the operational performance of the rice transplanter when changing speed, and by extension, the operability of the rice transplanter, thereby achieving an effect of improving the working capacity.

〔Example〕

Hereinafter, the embodiment of the present invention will be explained with reference to a drawing in which it is applied to a riding type rice transplanter. In the drawing, reference numeral 1 indicates a traveling vehicle body, and the traveling vehicle body 1 includes a downwardly forged U-shaped vehicle body frame 2, It consists of two front wheels 3 attached to the lower front surface and two rear wheels 5 attached to the lower surface of the rear via a chain case 4. An engine 6 is mounted on the upper surface of the body frame 2 at the front, and a steering wheel is mounted at the rear. The seats 7 are each provided with a steering handle 8 between them for moving and steering the two front wheels 3.

Reference numeral 9 denotes a seedling planting device that is attached to the rear of the traveling vehicle body 1 via a parallel link mechanism 10 and a hitch mechanism 11 so as to be vertically movable and detachable. a plurality of planting cases 13 attached at appropriate intervals laterally on the left and right sides of the
Each planting case 13 consists of floats 14 and 15 attached to the lower surface of each planting case 13, and a seedling stand 16 whose upper end is inclined so as to approach the traveling body 1.
A seedling planting mechanism 17 is provided at the rear end of the vehicle 3, and the seedling planting device 9 is raised and lowered by a hydraulic cylinder 18 provided between the traveling vehicle body 1 and the parallel link mechanism 10.

A gear transmission type transmission 19 is provided on the lower surface of the body frame 2, and between an input shaft 20 of the transmission 19 and an output shaft 21 of the engine 6, there is a main clutch and a transmission belt, which will be described in detail later. A transmission mechanism 22 is provided to transmit the rotation of the engine 6 to a transmission 19, and from the transmission 19 to the two front wheels 3 and the two rear wheels 5, the transmission 19 changes the speed to two forward speeds and one reverse speed to transmit power. On the other hand, the power is transmitted to the seedling planting device 9 via the telescopic shaft 23 to drive them, and the transmission mechanism 19 and the belt type transmission mechanism 22 are operated as appropriate on the left side of the control seat 7. A speed change operation mechanism 24 (details will be described later) is provided for this purpose.

As shown in FIGS. 3 and 4, the belt-type transmission mechanism 22 is loosely wound between a driving large-diameter pulley 25 on the output shaft 21 of the engine 6 and a driven small-diameter pulley 26 on the input shaft 20. Hooked medium speed belt 2
7, and a low-speed belt 30 loosely wound between the main driven small diameter pulley 28 of the output shaft 21 and the driven large diameter pulley 29 on the input shaft 20. The base end boss 34 of a tension arm 33 has a tension pulley 32 at its tip that comes into contact with the medium-speed belt 27, and a tension arm 33 that has a tension pulley 32 that comes into contact with the low-speed belt 30 at its tip. A base end boss 37 of a tension arm 36 having a tension pulley 35 is rotatably fitted into each base end boss 34, 37.
The bell crank levers 38 and 39 are fixed respectively, and the long groove hole 4 of the end fitting 42 of the medium speed wire 41 is inserted into the tip pin 40 of the medium speed bell crank lever 38.
3, engage the long groove holes 47 of the end fitting 46 of the low speed wire 45 with the end pin 44 of the low speed bell crank lever 39, respectively, and attach the pin 49 to the vehicle body frame so that the center part of the top lever 48 can rotate freely.
Tension springs 50 and 51 are mounted between both ends of the top lever 48 and the other ends of the bell crank levers 38 and 39, respectively.
Both tension pulleys 32, 35 at 0,51,
Each of the belts 27 and 30 is biased so as to come into pressure contact with the belts 27 and 30.

Note that the reference numeral 52 in FIGS. 3 and 4 is
A clutch lever associated with both the tension arms 33 and 36 is shown, and one end of the clutch lever 52 is connected to a clutch petal 54 attached to the vehicle body frame 2 via a connecting rod 53.
4, the clutch lever 52 is rotated in the direction of arrow 52', and both tension arms 33, 36 are rotated upward against the springs 50, 51.

On the other hand, on the side surface of the vehicle body frame 2, a T-shaped switching lever 55 is rotatably pivoted to the location of the speed change operation mechanism 24 with a pin 56.
The vehicle body frame 2 is inserted into the long slot 57 provided at the rear end of the body frame 5.
A toggle lever 5 whose central part is pivotally connected to the
9 is inserted and engaged, and a tension spring 62 is installed between the pin 61 at the rear end of the toggle lever 59 and the pivot pin 56 of the switching lever 55. The tension spring 62 forms a toggle mechanism 63 that holds the switching lever 55 in the state shown by the solid line in FIG. 6 and the state shown by the two-dot chain line.

The pin 64 at the lower end of this switching lever 55
, a metal fitting 6 at one end of the medium speed wire 41
5, while the switching lever 55
An L-shaped pin 68 is slidably fitted into a long groove hole 67 provided at the upper end, and the long groove hole 70 of the metal fitting 69 at one end of the low-speed wire 45 is engaged with the L-shaped pin 68. is in the state shown by the solid line in FIG. 6, the tension on the medium-speed wire 41 is loosened, and the medium-speed tension arm 33
0, the tension pulley 32 at its tip presses and tensions the medium-speed belt 27, and the power transmission is engaged.
By pulling the low speed wire 45 backward,
The low-speed tension arm 36 rotates upward against the spring 51, and the tension pulley 35 at its tip separates from the low-speed belt 30, loosening the low-speed belt 30 and turning power transmission off. do it like this.

When the switching lever 55 is rotated to the state shown by the two-dot chain line in FIG. 6, the medium speed wire 41 is pulled rearward, and the medium speed tension arm 33 is
0, the tension pulley 32 at its tip separates from the medium-speed belt 27, and the medium-speed belt 27 loosens, resulting in a power transmission off state, while the low-speed wire 45
The tension of the low speed tension arm 36 is released.
is rotated downward by a spring 51, and a tension pulley 35 at the tip thereof presses and tensions the low-speed belt 30, so that power transmission is enabled.

On the other hand, the speed change operation mechanism 24 includes a speed change shaft 72 rotatably supported on the upper surface of the vehicle body frame 2 by a bearing 71 in a direction perpendicular to the traveling direction of the traveling vehicle body 1. A gear shift operating lever 73 is pivotally attached to the fitted boss body 74 with a pin 74' so as to be rotatable in the outward direction of the traveling vehicle body 1, and the base end 73' of the gear shifting operating lever 73 is connected to the gear shift shaft 72. When the shift operating lever 73 is extended in the axial direction, its base end 73' engages with the groove 76 of the forked piece 75 fixed to the shift shaft 72, and the lever 77 fixed to the shift shaft 72 is rotated. , is connected to the transmission shifter shaft 78 in the transmission 19 via a link mechanism 79, and the transmission operating lever 73 is connected along the main transmission guide groove 81 in the guide plate 80,
When set to the rear (R) position, the transmission 19 causes the traveling vehicle body 1 to travel backwards, when set to the () position, the transmission moves forward at medium speed, and when set to the (N) position, the transmission 19 moves the vehicle body 1 to the neutral position.
When the vehicle is placed in the forward () position, the vehicle is configured to switch to high-speed forward travel.

A long groove hole 84 is bored in the middle of the interlocking link 83 whose lower end is pivotally connected to the T-shaped switching lever 55 by a pin 82, and the speed change shaft 72 is inserted into the interlocking link 84. Gear shift shaft 7 at the upper end of
A circular arc-shaped long slot 85 having a radius centered at
3', the gear shift operation lever 73 is inserted into the main gear shift guide groove 81 in the guide plate 80.
(), push down the interlocking link 83 to bring the switching lever 55 into the state shown by the solid line in FIG. When rotated to the () position, the interlocking link 83 is pulled up and the switching lever 55 is placed in the state shown by the two-dot chain line in FIG.
A parking link 88 having a protrusion 87 at the upper end is rotatably fitted on the end of the parking link 8.
The L-shaped pin 68 is attached to the pin 89 at the lower end of the
While the rear end is rotatably engaged, the shift operation lever 73 has an engagement member that comes into contact with the protrusion 87 at the upper end of the parking link 88 when the shift operation lever 73 is in the ( ) position along the auxiliary shift guide groove 86. A mating piece 90 is provided so that when the shift operation lever 73 is rotated forward from the () position, the parking link 88 is rotated rearward, and a lateral groove 91 is provided at the tip of the sub-shift guide groove 86. The gear shift operation lever 73 is rotated forward and held at the (P) position.

In this configuration, when the shift operation lever 73 is positioned in the main shift guide groove 81 in the guide plate 80, the switching lever 55 is in the state shown by the solid line in FIG. Since only belt 27 is tensioned, engine 6
The power is transmitted to the transmission case 19 via the medium speed belt 27. Therefore, when the shift control lever 73 is moved to the forward position (), the transmission 19 is switched to high speed and the vehicle body 1 travels forward at high speed, and when the shift control lever 73 is set to the () position, the transmission is switched to medium speed and the vehicle moves forward. The vehicle body 1 travels forward at medium speed, and when the shift operation lever 73 is moved to the rear (R) position, the transmission 19 switches to reverse gear shifting and the vehicle body 1 travels backward.

When the shift operation lever 73 is operated from the () position to the () position along the sub-shift guide groove 86, the upward movement of the interlocking link 83 causes
Since the switching lever 55 is rotated to the state shown by the two-dot chain line in FIG. The vehicle body 1 travels forward at a speed slower than the second forward speed, and at the same time as this switching, the parking link 88
is in the vertical state as shown in FIG. When the parking link 88 is rotated forward and placed in the horizontal groove 91 (P) position, the parking link 88 rotates backward as shown by the two-dot chain line in FIG. 9 and pulls the low-speed wire 45 backward. As a result, in addition to the medium-speed belt 27, the low-speed belt 30 is also loosened, and the power transmission from the engine 6 to the transmission 19 is completely cut off. Both will stop at the same time.

The rice planting work is carried out by driving the seedling planting device 9 with a planting clutch lever (not shown) in a forward running state with the speed change operation lever 73 in the () position or () position. During the work, if there are fewer or no seedlings left on the seedling stand 16 in the seedling planting device 9,
When the shift operation lever 73 is moved to the (P) position along the sub-shift guide groove 86 and fitted into the horizontal groove 91, the power transmission from the engine 6 to the transmission 19 is cut off, and the forward movement of the rice transplanter is stopped and the seedlings are removed at the same time. Since the driving of the planting device 9 is stopped and the rice planting work is interrupted, and this interrupted state is maintained, seedling mats can be replenished onto the seedling platform 16 in this state, and the speed change operation can be performed after replenishing the seedling mats. Move the lever 73 to the horizontal groove 9
1 and return it to the original position () or (), the seedling transplanting device 9 is driven at the same time as the rice transplanter starts moving forward, so the rice transplanting work can be started again, and the seedling transplanting work can be started before the seedling splicing work. The operation to stop traveling and the operation to stop the seedling planting device in , and the re-travel operation after the seedling splicing operation and the driving operation of the seedling planting device can be performed by a single speed change operation lever.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is a side view of a riding rice transplanter, Fig. 2 is a plan view of Fig. 1, and Fig. 3 is a side view of a riding rice transplanter.
The figure is an enlarged cross-sectional view of Fig. 1, and Fig. 4 is a cross-sectional view of Fig. 3.
5 is an enlarged sectional view of FIG. 1, FIG. 6 is a side view of FIG. 5,
FIG. 7 is an enlarged cross-sectional view taken from the negative side of FIG. 5, FIG. 8 is a plan view taken from the negative side of FIG. 6, and FIG. 9 is a view showing the operating state of FIG. 6. 1... Traveling vehicle body, 6... Engine, 9... Seedling planting device, 19... Mission, 21... Output shaft, 2
2... Belt type transmission mechanism, 20... Input shaft, 2
7, 30... Belt, 32, 35... Tension pulley, 33, 36... Tension arm, 5
0,51...Spring, 41,45...Wire, 55
...Switching lever, 73...Speed control lever.

Claims (1)

[Scope of utility model registration request] A rice transplanter comprising an engine at the front of a running vehicle body supported by wheels and a seedling planting device at the rear of the machine body, an output shaft interlocking with the engine, and an input shaft interlocking with the wheels and the seedling planting device. Two belts having different transmission ratios are wound over the period, and two tension pulleys are arranged to contact each of the first belt and the second belt, and the tension pulleys are connected to the first belt and the second belt. , each is provided with a spring that presses each of them into contact with the belt and biases the power transmission on, and resists the biasing force of the spring to move the tension pulleys to the power transmission off position away from the belt. An interlocking mechanism is provided, and when one tension pulley is in a power transmission on position, the other tension pulley is in a power transmission off position, and one tension pulley is in a power transmission off position. 1. A speed change operation device for a rice transplanter, comprising a switching mechanism configured to switch the other tension pulley to a power transmission engaged position when the other tension pulley is in the power transmission ON position.