JPS6233086B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a speed change operation device for traveling of a mobile agricultural machine.

For example, in the case of a rice transplanter, seedlings are generally planted at a high machine speed, and when the machine turns near the edge of a bank, the running transmission is turned to a low speed for safety and smooth acceleration after turning. Furthermore, when the aircraft turns, the seedling planting device is raised and lowered in parallel. However, in the past, only a manual lever was provided as an operating tool for the propulsion transmission, so the three operations of machine orientation, propulsion gear change, and raising/lowering of the seedling planting device could not be performed at the same time. First, there was a drawback that work efficiency decreased.

In view of the above circumstances, the present invention provides a driving speed change operation,
The purpose is to enable operations to be performed efficiently with other two-handed operations in parallel.

Next, embodiments of the present invention will be described in detail based on illustrative drawings.

An engine 3 is mounted on the front part of a traveling vehicle body with wheels 1 and 2 mounted on the front and rear wheels, and a seedling planting device 4 is installed at the rear part of the vehicle so that it can be driven up and down via a hydraulic cylinder 5. A driver's seat 6 is installed at the top of the rice transplanter, and a riding-type rice transplanter capable of planting four rows is constructed.

As shown in FIGS. 2 and 3, between the engine 3 and the transmission case 7 that houses a gear type main transmission (not shown) that transmits power to the wheels 1 and 2, the output of the engine 3 is An output pulley 9 is attached to the shaft 8, and input pulleys 11 and 12 of different sizes and diameters are attached to the input shaft 10 of the transmission case 7.
and the second transmission belts 13 and 14, and the first transmission belts 13 and 14 are each made separately.
A double tension type traveling sub-transmission device in which second tension pulleys 15 and 16 are attached to the lateral support shaft 19 of the transmission case 7 by arms 17 or 18 so as to be swingable up and down, and are also used as the main clutch. R is configured.

The operating device for the auxiliary transmission, which serves as a traveling transmission, is configured as follows.

That is, as shown in FIGS. 2 to 5,
Tension springs 21a and 21b are stretched across the tension arms 17 and 18 and the gate-shaped frame 20 when viewed from the front, so that the first and second tension pulleys 15 and 16 are always on the entry side. It is energized. A manual shift lever 22 is pivotally connected to the end of the support shaft 19 so as to be swingable back and forth, and a midway point in the longitudinal direction of the lever 22 is attached to a support bracket 23 so as to be swingable around the horizontal axis _P1 . It is pivotally connected to the pivotally connected plate body 24 via the elongated hole 25, and
First and second links 26 and 27, whose one ends are pivotally connected to a predetermined location of the plate body 24, are pivotally connected to the tension arms 17 and 18 through elongated holes 28, respectively. Further, the plate body 24 is provided with a groove having a predetermined width, and fixing pins 41 are provided protruding from the bracket 23 to abut against both side walls 29 of the groove, so that the plate body 24 can be fixed within a predetermined range. It is constructed so that it can be swung within. When the shift lever 22 is operated to the front end position H of the guide groove of the lever guide 30, the second tension is moved through the second link 27 against the biasing force of the spring 21b, as shown in FIG. While the tension pulley 16 is separated from the second transmission belt 14, the first tension pulley 15 is connected to the spring 21a by the elongated hole 28.
The biasing force causes the first transmission belt 13 to enter and operate, and a high-speed state is obtained. When the shift lever 22 is operated to the rear end position L of the lever guide groove, as shown in FIG. 6B. Thus, by moving the first tension pulley 15 away from the first transmission belt 13 and operating the second tension pulley 16, a low speed state is obtained, and the shift lever 22 is moved into the lever guide groove. When the operation is performed to the front-rear intermediate position N, both the first and second tension pulleys 15 and 16 are moved to the first position, as shown in FIG.
By separating it from the second transmission belts 13 and 14, a transmission cut state is obtained.

Further, as shown in FIGS. 4 and 5, the shift lever 22 is connected to the tension pulleys 15 and 16 at the distal end side of the connecting portion to the plate body 24.
The axis P ₂ is almost perpendicular to the swing axis for operating the
A notch 31 as an example of a mechanism for retaining the shift lever 22 at the neutral position N by locking a portion of the shift lever 22 corresponding to the distal end side of the buckle portion of the shift lever 22.
is formed on the lever guide 30.

Then, the tip side portion of the gear shift lever is inserted into the notch 31.
The spring 32 that swings and urges in the direction of entering the
The notch 31 is attached to the bent portion and is configured so that simply by operating the speed change lever 22 to the neutral position N, the notch 31 is automatically activated and maintained in the transmission cut state.

Further, as shown in FIGS. 3 to 5, a long hole forming member 34 connected to the tip of the rod 33 is inserted into the first hole.
The pins 35 and 36 are inserted between the second links 26 and 27, and fixedly attached to the long hole forming member 34 in order to attach the springs 21a and 21b to the first and second links 26 and 27, respectively.
The rod 33 is inserted into the oval long hole of the spring 38, and the rod 33 and the gear shift lever 22 are linked together via the tension arms 17, 18, both links 26, 27, and the plate 24.
The pedal 37 and the rod 33 are connected to each other by an arm 40 extending from a mounting boss for the support shaft 39 of the pedal 37. be. Further, the gear shift lever 22 is in the operating position H,
In both L and N positions, as the pedal 37 is depressed, the links 26 and 27 are pushed up by the tension arm pins inserted into their elongated holes 28, and when the pedal 37 is depressed, When the shift lever 22 is at the side stroke end position, as shown in FIG.
Located at a point A slightly closer to the low speed position L, as shown in FIG. Due to the attitude of the plate body 24, the downward biasing force of the second tension pulley 16 is
When the downward biasing force of the tension pulley 15 is greater than that of the tension pulley 15, and when the pedal 37 is released and returned to the neutral position by the spring 21b, only the second tension pulley 16 is in the engaged state due to the spring 21b. The link elongated hole 28 is set so that. In normal times,
The elongated hole of the rod 33 allows the tension pulleys 15 and 16 to be selectively engaged and operated by the control lever 22 without displacing the pedal 37 from the neutral position, and the speed control lever 22 controls the speed. Regardless of the state, by depressing the pedal 37, both transmission belts 13 and 14 can be cut, and then by returning the pedal 37 to the neutral position, only the second transmission belt 14 can be turned on. It is configured so that it can be done.

Since rice transplanters are planted with the sub-transmission in a high-speed state, the sub-transmission is configured to go into a low-speed state when the pedal 37 is operated. In the case of a mobile agricultural machine that travels at high speed in a headland to improve efficiency, it is preferable to operate the pedal 37 to bring it into a high speed state.

In the above embodiment, the plate body 24, the first and second
The links 26 and 27 are referred to as a speed change operation mechanism K.

In the above embodiment, the transmission is also used as the main clutch, and the transmission is in the disengaged state when the pedal is depressed in order to switch the main transmission mechanism. It may be implemented such that the transmission is in a specific speed state in the state.

In summary, the traveling speed change operating device for a mobile agricultural machine according to the present invention includes a speed change operating mechanism that selectively switches the traveling speed change device between a high speed drive state and a low speed drive state based on a switching operation of a speed change lever. In the speed change operation device for traveling of a mobile agricultural machine, an operation pedal is provided for operating the speed change operation mechanism so as to switch the speed change device for travel to a non-driving state when depressed, regardless of the operating state of the speed change lever. At the same time, as the operation pedal is depressed and the release operation is performed, the driving transmission is activated.
The operation pedal and the speed change operation mechanism are characterized in that the operation pedal and the speed change operation mechanism are linked so that the speed change drive state is returned to a constant speed change drive state of the high speed drive state or the low speed drive state, regardless of the speed change drive state before the depression. Since then, it has become possible to change the speed of the propulsion transmission device with your feet, and as a result, it is possible to change the machine's running speed, for example, to reduce the running speed, operate the machine direction, and raise and lower the seedling planting device at the same time. This makes it possible to perform operations and other operations using both hands at the same time, allowing work to be done more efficiently.

[Brief explanation of the drawing]

The drawings show an embodiment of the speed change operation device for traveling of a mobile agricultural machine according to the present invention, in which FIG. 1 is a side view of a riding rice transplanter, FIG. 2 is a front view of the transmission mounting section, and FIG. 4 is a perspective view of the gear shift lever mounting part, FIG. 5 is a cross-sectional view of the interlocking system of the gear shift lever and the tension arm, and FIGS. 6 A to 6 are side views showing the operating state of the tension pulley. FIG. 7 is a side view of the transmission when the pedal is depressed, and FIG. 8 is a plan view showing the operating position of the transmission lever. K...speed change operation mechanism, R...speed change device for traveling, 22
...shift lever, 37...pedal.

Claims (1)

[Claims] 1. In a speed change operation device for traveling of a mobile agricultural machine equipped with a speed change operation mechanism K that selectively switches the speed change device R for travel between a high speed drive state and a low speed drive state based on the switching operation of the speed change lever 22, the step-in operation Accordingly, an operating pedal 37 is provided for operating the speed change operation mechanism K so as to switch the traveling transmission R to a non-driving state regardless of the operating state of the speed change lever 22, and the operation pedal 37 is depressed. The operating pedal 37 is configured to return the traveling transmission R to a constant speed change drive state of the high speed drive state or the low speed drive state in response to the release operation, regardless of the speed change drive state before the depression. A speed change operation device for running a mobile agricultural machine, characterized in that a speed change operation mechanism K and a speed change operation mechanism K are linked.