JPH062758A - Interlocking device for main transmission and sub-transmission - Google Patents

Abstract

PURPOSE:To operate the selection of the main speed change mechanism and the subspeed change mechanism of a walking type cultivator, by one speed change lever. CONSTITUTION:In the longitudinal direction of a machine body, a main speed change yoke 27 is installed in a rockable manner in the vertical direction. A lever boss 30 is pivotally installed in a turnable manner in the horizontal direction, at the rear part of the main speed change yoke 27, and a speed change lever 21 is fixedly installed at the rear part of the lever boss 30. Further, a main speed change shaft 37 is connected with the front part of the main speed change yoke 27 through a main speed change arm 35, and a main speed change shifter 40 shifts to operate a main speed change mechanism 24. While, a ball joint rod 53 is connected on the side part of the lever boss 30, and a subtransmission arm 52 is set turnable, and a subspeed change shifter 48 is shifted through a connecting shaft 50 and a subspeed change shaft 46, and a subspeed change mechanism 25 is set to be operated. Accordingly, an interlocking device 26 for operating the main speed change mechanism 24 and the subspeed change mechanism 25 by one speed change lever 21 is formed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an interlocking device for a main speed change mechanism and an auxiliary speed change mechanism, and more particularly to an interlocking device for a main speed change mechanism and an auxiliary speed change mechanism of a walk-type cultivator.

[0002]

2. Description of the Related Art A conventional walk-behind cultivator is shown in FIG. An engine 2 is mounted on the frame 1, a gear case 3 is provided at a rear portion of the engine 2, and an axle 4 is pivotally attached to a lower portion of the gear case 3.
A handle frame 5 is fixed to the gear case 3, the handle frame 5 extends rearward, and operation handles 6 and 6 are attached.

A main transmission mechanism 7 is provided inside the gear case 3.
And a sub transmission mechanism 8 are provided, the main transmission mechanism 7 is connected to the main transmission lever 9 via the transmission mechanism, and the sub transmission mechanism 8 is connected to the sub transmission lever 10 via the transmission mechanism.
Thus, when the main transmission lever 9 is rotated up or down, the main transmission mechanism 7 moves from the neutral position to high forward speed, low forward speed,
Alternatively, it can be switched to each position such as reverse. Further, when the auxiliary gear shift lever 10 is rotated forward or backward, the position determined by the main gear shift lever 9 can be switched so as to shift to several higher and lower gears.

[0004]

The main shift change and the sub shift change of the conventional walk-type cultivator are separately operated by the turning operation of the main shift lever or the turning operation of the sub shift lever, respectively. Therefore, the gear shifting operation becomes complicated and it is difficult to quickly select the optimum vehicle speed. Therefore,
Since the switching of the main transmission mechanism and the switching of the auxiliary transmission mechanism can be operated with one lever, a technical problem to be solved arises so that the vehicle speed suitable for the usage situation can be simply and quickly selected. The present invention aims to solve this problem.

[0005]

SUMMARY OF THE INVENTION The present invention has been proposed in order to achieve the above object, and comprises a main speed change mechanism and an auxiliary speed change mechanism, and switches the respective speed change mechanisms by rotating a speed change lever. In a freely movable walking cultivator, a main shift yoke is provided in the front-rear direction of the machine body so as to be swingable in the vertical direction, and a lever boss that is horizontally rotatable is pivotally attached to the rear portion of the main shift yoke. A gear shift lever is attached to the rear portion of the lever boss so as to project rearward, a main shift shifter is connected to one end of a main shift shaft provided in the front-rear direction of the machine body, and the main shift yoke is connected to the other end of the main shift shaft. The main transmission arm is fixed orthogonally to the main transmission arm, and the front portion of the main transmission yoke is connected to the end portion of the main transmission arm via the stay link, while the sub-transmission shaft connected to the sub-transmission shifter can be moved up and down. Hung on the One end of a connecting shaft pivotally mounted orthogonally to the sub-shift shaft is connected to the upper end of the shift shaft, the sub-transmission arm is fixed to the other end of the connecting shaft, and the sub-transmission arm and the lever boss are connected to each other. An interlocking device for a main transmission mechanism and an auxiliary transmission mechanism, characterized in that side portions are connected by a ball joint rod.

[0006]

When the speed change lever is rotated up or down, the main speed change yoke swings up and down together with the lever boss, and the main speed change arm is connected to the main speed change yoke via the stay link connected to the front part of the main speed change yoke. Rotate in the orthogonal direction. Therefore, the main transmission shaft provided in the front-rear direction of the machine body rotates about the axis, and the main transmission shifter moves to switch the main transmission mechanism.

On the other hand, when the shift lever is rotated to the left or right in the horizontal direction, the lever boss horizontally rotates with respect to the main shift yoke in the same direction as the operating direction of the shift lever. In such a case, the ball joint rod is pushed and pulled to rotate the sub-transmission arm around the connecting shaft, and the sub-transmission shaft provided at one end of the connecting shaft at right angles to the connecting shaft moves up or down. To do. Therefore, by the vertical movement of the auxiliary transmission shaft, the auxiliary transmission shifter moves and the auxiliary transmission mechanism is switched.

Thus, it is possible to operate both the switching of the main speed change mechanism and the switching of the sub speed change mechanism with one speed change lever.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to FIGS. For convenience of explanation, the same components as those of the related art will be described at the same time. FIG. 1 shows a walk-behind cultivator, in which an engine 12 is mounted on a frame 11, a gear case 13 is provided at a rear portion of the engine 12, and an axle 14 is pivotally attached to a lower portion thereof. Support frames 15 and 15 are attached to the upper and lower sides of the gear case 13 on both left and right sides, a handle frame 16 is fixedly mounted on the support frames 15 and 15, and a battery 17 is provided.
A battery cover 18 for covering the above is provided so as to be openable and closable.
Left and right operation handles 1 on the rear of the handle frame 16.
9 and 19 are attached, an operation panel 20 also serving as a lever guide is fixedly provided, and a speed change lever 21 of the machine body and a speed change lever 23 of the tiller 22 are provided rearwardly.

2 and 3 show an interlocking device 26 of the main transmission mechanism 24 and the sub transmission mechanism 25. A main transmission yoke 27 is provided in the longitudinal direction of the machine body, and the main transmission yoke 27 is provided.
The main shaft 28 is fitted with the central shaft 28 at a substantially central position thereof.
Make 7 swingable up and down. Both ends of the central shaft 28 are pivotally supported on both left and right sides of the handle frame 16. A pin 29 is fitted on the rear portion of the main gearshift yoke 27 so that the lever boss 3
0 is rotatably pivoted in the horizontal direction, and the base of the speed change lever 21 is fixed to the rear portion of the lever boss 30. The speed change lever 21 is provided in the guide groove 3 of the operation panel 19.
It penetrates 1 and is projected to the back.

First, the switching mechanism of the main transmission mechanism will be described. The pin 33 is fitted into the front portion of the main transmission yoke 27 and one end of the stay link 34 is pivotally attached to the stay link 3.
One end of a main transmission arm 35 provided orthogonal to the main transmission yoke 27 is pivotally attached to the other end of 4 by a pin 36. A rear portion of a main transmission shaft 37 provided in the front-rear direction of the machine body is fixed to a central portion of the main transmission arm 35, and the main transmission arm 35 has the main transmission shaft 37 as a rotation center and the main transmission yoke. 27
It is swingable in the up and down direction orthogonal to. A pin 38 is provided at the other end of the main transmission arm 35. The front portion of the main transmission shaft 38 is inserted into the gear case 13,
An arm boss 39 is fitted on the front end portion of the main transmission shaft 38 to fix the main transmission shifter 40.

Here, if the speed change lever 21 is rotated upward as indicated by the chain double-dashed line, the rear portion of the main speed change yoke 27 moves upward around the central shaft 28 as shown in FIG. The front portion of the main transmission yoke 27 moves downward around the central shaft 28 as the center of rotation. Further, one end of the main transmission arm 35 is pushed down from the position shown by the chain line to the position shown by the solid line via the stay link 34, and the main transmission arm 35 rotates together with the main transmission shaft 37 in the direction of arrow X in the figure. To do.

Therefore, the main transmission shifter 40 is moved in the depth direction of the paper surface of the figure by the arm boss 39 shown in FIG. 2, and the main transmission mechanism 24 is switched from the forward high speed position to the low forward speed position. FIG. 5 shows the front surface of the operation panel 20, and a guide groove 31 for switching the main transmission mechanism when the auxiliary transmission mechanism is in the neutral position is provided in the vertical position in the figure.
A guide groove 41 that is orthogonal to the guide groove 31 and that switches the auxiliary transmission mechanism at the forward high speed position, a guide groove 42 that switches the auxiliary transmission mechanism at the low forward speed position, and a switching of the auxiliary transmission mechanism at the reverse position. Guide grooves 43 for performing the above are respectively provided at lateral positions in the figure. Furthermore, the operation panel 2
A guide groove 44 of the speed change lever 23 of the tiller is provided laterally in the lower part of 0, and monitor lamps 45, 45, 45 are provided in the upper part of the operation panel 20.

When the speed change lever 21 is rotated further upward from the position shown in FIG. 4, the front portion of the main speed change yoke 27 is further rotated downward, and the main speed change is performed via the stay link 34. One end of the arm 35 is further pushed down. Therefore,
The main transmission shaft 37 further rotates in the direction of the arrow X in the figure, the main transmission shifter 40 shown in FIG. 2 moves, and the main transmission mechanism 24 switches from the forward low speed position to the reverse position. In such a case, in the operation panel 20 shown in FIG. 5, the speed change lever 21 moves from the position of the guide groove 42 to the position of the guide groove 43, and the sub shift operation for reverse movement is enabled.

Next, the auxiliary transmission mechanism 2 will be described with reference to FIGS.
The switching mechanism of No. 5 will be described.
A sub-transmission shaft 46 is vertically movably mounted on the above, and an arm boss 47 is fixed to the lower portion of the sub-transmission shaft 46 and is connected to the sub-transmission shifter 48.
An upper portion of the sub-transmission shaft 46 projects to an upper portion of the gear case 13, and an upper end thereof is provided with a locking portion 49 by fixing two plates at a constant interval. Then, the auxiliary transmission shaft 46
A connecting shaft 50 is provided at right angles to the
5 and 15 are pivotally supported. The arms 51, 51 are arranged side by side at one end of the connecting shaft 50, and the tip end of the arms 51, 51 are inserted and engaged with the locking portion 49 of the auxiliary transmission shaft 46. Also, the connecting shaft 5
0 is fixed to the other end portion of the auxiliary transmission arm 53, and the tip portion 53a of the auxiliary transmission arm 53 and the side portion 30 of the lever boss 30.
and a are connected by a ball joint rod 53.

Then, if the speed change lever 21 is rotated in the horizontal direction as shown by the chain double-dashed line in FIG.
The lever boss 30 horizontally pivots in the direction of the arrow Y _{1 in} the figure around the pin 29 fitted in the rear portion of the lever boss 30, and the side portion 30a of the lever boss 30 pulls the ball joint rod 53 rearward so as to pull the auxiliary transmission arm 52 and the connecting shaft. 50 rotates in the direction of the arrow Y _{2 in} the figure. Therefore, the tips of the arms 51, 51 fixed to the other end of the connecting shaft 50 rotate upward, and the sub-transmission shaft 46
The sub-transmission shaft 46 is lifted by pressing the locking portion 49 of the above (moving in the direction of the arrow Y ₃ ).

As a result, the arm boss 47 shown in FIG. 2 moves upward, and the auxiliary transmission shifter 48 switches the auxiliary transmission mechanism 25 from the neutral position to the triple position. The auxiliary transmission mechanism 25
A key-sliding type transmission is used for this, and the vertical movement of the sub-transmission shaft 46 is converted to the front or back direction of the paper surface in FIG. 2, and the sub-transmission shifter 48 slides in either of the above directions. Then, the sub-transmission mechanism 25 is switched to the first, second, neutral, and third positions.

Thus, in the present invention, the main transmission mechanism 2
By connecting 4 and the sub transmission mechanism 25 by the interlocking device 26, the switching operation of the main transmission mechanism 24 and the switching operation of the sub transmission mechanism 25 can be performed with only one shift lever 21. Further, as is clear from the operation pattern of the operation panel 20 of FIG.
Alternatively, in order to change the sub-shift at each reverse position, the shift lever 21 may be operated laterally one step at a time, and for the main shift, the guide groove 31 at the neutral position may be operated in the vertical direction. Compared with this, the lever stroke is shorter and the operability is improved. Further, for example, by providing the neutral position in the middle of switching from the second speed to the third speed where the speed greatly changes and switching from the fifth speed to the sixth speed,
It is possible to prevent accidents such as a shock of the machine body due to an operator's erroneous operation.

Further, since the sub-transmission mechanism 25 is provided with a key-slide type transmission, the push-pull operation of the sub-transmission shifter 48 can be switched without a clutch, and the vehicle speed can be switched very easily and quickly. Further, the connecting shaft 50, the auxiliary transmission arm 52, and the locking portion 49 of the auxiliary transmission shaft 46.
And the like are provided on the upper part of the gear case 13, the assembling and adjusting operations are easy, and since the rotation fulcrum of the speed change lever 21 is separate from the handle frame 16, it is possible to check the speed change state and maintain. Workability is significantly improved.

The present invention can be modified in various ways without departing from the spirit of the present invention, and it goes without saying that the present invention extends to such modifications.

[0021]

As described in detail in the above one embodiment, the present invention connects the main transmission mechanism and the sub transmission mechanism by the interlocking device, so that it is possible to perform both switching operations with only one transmission lever. became. Therefore, the shift operation of the operator is remarkably simplified, the risk of erroneous operation is eliminated, and the vehicle speed suitable for the use situation can be simply and quickly selected. Further, the invention of the invention has various kinds of effects such that the structure of the interlocking device is simplified and the assembling and adjusting can be easily performed.

[Brief description of drawings]

FIG. 1 is a side view of a walk-behind cultivator showing an embodiment of the present invention.

FIG. 2 is a side view of essential parts showing an interlocking mechanism of a main transmission mechanism and an auxiliary transmission mechanism.

FIG. 3 is a perspective view of the interlocking mechanism showing a state in which the main shift position of the shift lever is at a high forward speed and the sub shift position is in neutral.

FIG. 4 is a perspective view of an interlocking mechanism showing an operating state when a main shift position of a shift lever is shifted to a forward low speed.

FIG. 5 is a front view of an operation panel.

FIG. 6 is a perspective view of the interlocking mechanism showing an operating state when the main shift position of the shift lever is at a low forward speed and the sub shift position is shifted to the third speed.

FIG. 7 is a side view of a conventional walk-behind cultivator.

[Explanation of symbols]

 21 gear shift lever 24 main gear shift mechanism 25 sub gear shift mechanism 26 interlocking device 27 main gear shift yoke 30 lever boss 30a side portion 34 stay link 35 main gear shift arm 37 main gear shift shaft 40 main gear shift shifter 46 sub gear shift shaft 48 sub gear shift shifter 50 connecting shaft 52 Sub gearbox 53 Ball joint rod

Claims (1)

[Claims] 1. A walk type cultivator comprising a main speed change mechanism and an auxiliary speed change mechanism, wherein each speed change mechanism can be switched by rotating a speed change lever, and a main speed change yoke is provided in the front-rear direction of the machine body. Of the main shift yoke, a lever boss that is horizontally rotatable is pivotally attached to the rear portion of the main shift yoke, and a shift lever is attached to the rear portion of the lever boss so that the lever boss projects rearward. A main gear shift shaft is connected to one end of the main gear shift shaft, and a main gear shift arm is fixed to the other end of the main gear shift shaft orthogonal to the main gear shift yoke, and a stay link is attached to the end of the main gear shift arm. The front portion of the main transmission yoke is connected to the auxiliary transmission shaft via a sub-transmission shaft, and the sub-transmission shaft connected to the sub-transmission shifter is vertically movably provided vertically. Connect one end of the connected shaft, A sub-transmission arm is fixed to the other end of the connecting shaft, and the sub-transmission arm and the side of the lever boss are connected by a ball joint rod. .