JPH07251644A - Speed change guide plate structure in mobile agricultural machine - Google Patents

Abstract

PURPOSE:To attain simplicity of operation, miniaturization of a device and decrease of weight by arranging a guide groove of a rotary speed change in both sides of a guide groove of a running speed change, in a mobile agricultural machine wherein the running speed change and the rotary speed change can be switched by guiding a single speed change lever to the guide groove. CONSTITUTION:In order to guide speed change operation of a speed change lever 1 extended along the upward of a steering handle from an upper part of a transmission case, the speed change lever 1 is inserted to a guide groove 10 of a guide plate 9 fixed to a vehicle body. The guide groove 10 of this guide plate 9 is provided with a running speed change switching shift having in a lateral (right/left) direction a forward 1st speed position F1, forward 2nd speed position F2, neutral position N, reverse position R and a work neutral position N', and also provided with rotary rotational direction switching guide grooves 10a, 10b having in a vertical position of this running speed change switching shift a forward rotary position S, neutral position NR and a reverse rotary position C. In this way, by the single speed change lever 1, running and rotary speed changes can be switched.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile agricultural machine, and more particularly to a small cultivator having a rotary integrally formed therein, and more particularly to a structure of a guide plate of its speed change lever.

[0002]

2. Description of the Related Art Generally, a tiller has a main gearshift lever for traveling and a tiller gearshift lever for rotary separately, and an operator operates both levers respectively to perform traveling gearshift and rotary gearshift. There is.

[0003]

For this reason, the operation of the tiller is complicated, and the device becomes complicated, which is an obstacle to downsizing and cost reduction. In particular, recently, a small cultivator having a rotary integrated therein has been devised, but the small cultivator is usually used by an amateur unfamiliar with the operation in a kitchen garden or the like, and the operation is easy. It is desired to improve the performance and further reduce the size and weight. Therefore, the present invention is configured such that the traveling and the rotary can be operated by operating one shift lever up and down or left and right, and by arranging the shift lever above and below or both sides of the guide groove for traveling shift, It is an object of the present invention to provide a transmission panel plate structure in a mobile agricultural machine that solves the problems.

[0004]

The present invention has been made in view of the above circumstances and, as shown in FIGS. 5 and 6,
In a mobile agricultural machine in which one shift lever 1 is guided in the guide groove 10 to switch between traveling shift and rotary shift, the rotary shift guide grooves 10a and 10b are arranged on both sides of the traveling shift guide groove 10. It is characterized by that.

The guide groove 10 of the guide plate 9 is, as shown in FIG. 5 or FIG.
It is preferable from the standpoint of operability that the longitudinal direction is arranged for traveling speed change with a large number of R, N, F2, and the vertical direction for rotary rotary direction switching with a small number of speed steps S, NR, C.

[0006]

According to the above structure, the speed change lever 1 is attached to the guide groove 1
When the moving operation is performed along 0, the tiller travels at an appropriate traveling speed, for example, first forward speed F1, reverse R, neutral N, and second forward speed F2. When the shift lever 1 is moved along the guide groove 10a or 10b, the rotary shift can be switched to, for example, the forward rotation position S, the neutral position NR, or the reverse rotation position C.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. The tiller 11 is, as shown in FIG.
The mission case 12, the engine 13, the traveling wheels 15, the rotary 16 and the steering wheel 17 which form the body frame.
Is equipped with.

The mission case 12 is composed of a large-sized member made of a press-fitting case. An engine frame 19 for mounting the engine 13 is fixed in front of the mission case 12, and a handle 17 is provided so as to extend obliquely rearward.
Is attached, and traveling wheels 15 and a rotary 16 are attached to the tip of the figure-shaped case portion, respectively. Further, the belt is wound around the output pulley of the engine 13 and the pulley fixed to the input shaft 19 (see FIGS. 3 and 4) of the transmission case 12 by a tension pulley that constitutes a main clutch so that the belt can be tensioned / relaxed freely. The belt and pulley are covered with a case 20.

Further, the transmission lever 1 extends from the upper portion of the transmission case 12 along the upper side of the handle 17,
Also, the speed change lever 1 is used for the fuel tank 2 above the engine 13.
1 is guided by the guide groove 10 of the guide plate 9 mounted over the mission case 12.

As shown in FIG. 5 or 6, the guide groove 10 of the guide plate 9 is in the lateral (left and right) direction in the first forward speed position F1, the second forward speed position F2, the neutral position N, and the reverse position R. And a traveling gear shift stage having a working neutral position N ',
Also, guide grooves 10a and 10b for switching the rotational direction of the rotary having a forward rotation position S, a neutral position NR, and a reverse rotation position C are provided above and below the traveling gear shift stage.

As shown in FIGS. 1 to 3, the gear shift lever 1 has a U-shaped base end portion, and the U-shaped portion 1a is vertically rotatable by a bolt pin 3. In addition, it is connected to the shifter interlocking shaft 2 so as to integrally interlock in the left-right direction.

Further, the shifter interlocking shaft 2 is rotatably supported by a collar 21 fixed to the transmission case 12, and a speed change arm 22 is welded inside the case 12. Further, the transmission case 12 is provided with a shift shift shaft 23 over the left and right side surfaces thereof, and both ends of the shift shaft 23 are clamped by collars 25, 25 and fixed by bolts 26, 26. A shift fork 27 is slidably fitted in the shift shaft 23. The shift fork 27 is positioned and biased to a predetermined position by a click stop mechanism with the shift shaft 23, is connected to the speed change arm 22, and is slidably connected to the input shaft 19 only in a slidable manner. It is engaged with the running shifter gear 6.

On the other hand, a U-shaped interlocking arm 5 is rotatably supported by the collars 25, 25 holding the speed shift shaft 23, and the interlocking arm 5 has a length extending in the lateral direction. A hole 5a is formed, and the shift lever 1 penetrates the elongated hole 5a. As a result, the transmission arm 1
Although the interlocking arm 5 is rotated around the collar 25 by the vertical movement of, the lateral movement of the lever 1 is absorbed by the elongated hole 5a and is not transmitted to the interlocking arm 5. Further, as shown in detail in FIG. 4, a collar 26 fixed to the mission case 12 is provided.
A rotary shifter interlocking shaft 27 is rotatably supported by the rotary shaft 27. The interlocking shaft 27 has a plate 29 fixed to the outside of the case, and a pin 2 fixed to the tip of the plate 29.
9a and a rod 30 are connected to the interlocking arm 5, and a rotary gearshift arm 31 is welded to the inner part of the case of the interlocking shaft 27.

Further, a rotary shift shaft 32 is disposed adjacent to the shift shift shaft 23 so as to extend over both side surfaces of the transmission case 12, and a shift fork 33 is slidable on the shift shaft 32. Is inserted into. The shift fork 33 is biased to a predetermined position by a click stop mechanism between the shift fork 33, the shift fork 33, the shift fork 33, the shift fork 33, and the input shaft 19. It engages with the existing rotary shifter gear 7.

In FIG. 3, the shifting shifter gear 6 is engaged with the gear 35 to engage the first forward speed F1, the gear 37 which is always meshed with the gear 36 to engage the second forward speed F2, and the constant gear. The reverse gear R is obtained by engaging the gear 39 meshing with the gear 38, and the rotary shifter gear 7 is engaged with the gear 40 by the forward rotation S and the gear 42 always meshing with the gear 41. Then, the reverse C is obtained. Further, the rotation of the traveling transmission system is transmitted to the traveling wheels 15 via the chain and the operating gear, and the rotation of the rotary transmission system is transmitted via the chain to the rotary 1.
6 is transmitted.

Further, as shown in FIGS. 2 and 4, the handle 17 is mounted so as to sandwich the transmission case 12 by a bracket 43 having a U-shape, and by mounting the bracket 43, the rotary shift shaft 32 is mounted. It is designed to prevent removal.

Further, as shown in FIGS. 3 and 7, bearing holders 45, 45 are attached to the transmission case 12, and the input shaft 19 is rotatably supported by a sealed bearing 45a attached to the holder 45. However, the bearing holder 45 is fixed by a straight line portion a formed on the case and the holder to prevent the bearing holder 45 from rotating and a flange b to prevent the bearing holder 45 from coming off. Accordingly, the holder 45 can be easily and surely fixed with an inexpensive structure. Since the mission of this embodiment is lubricated with grease, it is sufficient that the bearing 45a is simply sealed.

Since the present embodiment is constructed as described above, the rotation of the engine 13 is transmitted to the input shaft 19 at the transmission case 12 portion via the belt inside the case 20. When the operator moves the speed change lever 1 laterally (left and right) along the guide groove 10 of the guide plate 9, the left and right movements of the speed change lever 1 are transferred to the shift fork 27 via the shifter interlocking shaft 2 and the speed change arm 22. The fork 27 is transmitted, slides along the shift shaft 23, and is positioned at an appropriate position corresponding to the display on the guide plate. For example, when the speed change lever 1 is moved from the neutral position N to the forward second speed position F2, the fork 27 causes the traveling speed change shifter gear 6 to move to the gear 37.
When the cultivator 11 is driven at a high speed so as to be adapted to non-working traveling and is moved to the reverse position R, the shifter gear 6 is engaged with the gear 39 and moves backward. At this time, depending on the lateral movement of the speed change lever 1, the interlocking arm 5 is not affected by the sliding of the lever 1 in the elongated hole 5a and is kept at the rotary stop position NR.

When the speed change lever 1 is positioned at the work neutral position N'at the substantially central position of the guide plate 9, the lever 1 is operated in the vertical (up and down) direction along the guide groove 10a or 10b, the interlocking operation is performed. Arm 5 is shift shaft 2
It rotates up and down around 3. Then, the rotary shifter interlocking shaft 27 rotates via the rod 30 and the plate 29, and further the shift fork 3 via the speed change arm 31.
3 is slid along the shift shaft 32 and is positioned at an appropriate position corresponding to the display of the guide plate. For example, when the speed change lever 1 is moved from the neutral position NR to the normal rotation position S,
The shift fork 33 engages the shifter gear 7 with the gear 40 to transmit the rotation in the same direction as the forward direction to the rotary 16, and when the shift fork 33 moves to the reverse position C, the shifter gear 7 engages with the gear 42 to move in the forward direction. The rotation in the opposite direction is transmitted to the rotary 16.

At this time, the vertical movement of the speed change lever 1 merely rotates the bolt pin 3 and the traveling shifter interlocking shaft 2 is not affected at all and is in the traveling stop position. Then, with the shift lever 1 moved from the central position to the upper guide groove 10a or the lower guide groove 10b, the lever 1 is moved laterally along the guide groove 10 to the forward first speed position F1. . Then, similarly to the above, the shifter gear 6 is engaged with the gear 35 via the shifter interlocking shaft 2, the shift arm 22 and the shift fork 27, and the low speed rotation suitable for the work is transmitted to the wheels 15. As a result, the cultivator 11 is rotated with the rotary 16 rotating in the forward or reverse direction.
Moves forward and tillage work is carried out.

Further, in the present embodiment, the guide grooves for the rotary speed change are separately arranged above and below the guide groove for the speed change, but other than that, the guide grooves for the rotary speed change are arranged above or below the guide groove for the speed change. May be provided. Further, the guide groove 10 of the guide plate 9 is provided in the lateral direction to form a traveling speed change groove, and vertical rotary speed change grooves for converting the rotational direction of the rotary are vertically arranged at the upper and lower positions thereof. Although it is possible to make a large number of gear shifts using the machine width direction with plenty of space, it is possible to make the height direction low to form a compact and good design, and Since switching can be performed smoothly and immediately, operability can be improved.

[0022]

As described above, according to the present invention,
Both the gear shifting for traveling and the switching of rotary rotation can be performed by operating the one gear shift lever 1 in the left-right direction or the up-down direction, so that the operation is easy and can be used by an unfamiliar person in a home garden. Can work easily and safely. Further, since the vertical movement and the horizontal movement of one shift lever 1 are separated and used for traveling shift or rotary rotation switching, respectively, a simple configuration is sufficient, the number of parts can be reduced, and the manufacturing cost can be reduced. A lightweight and compact structure is possible, and it is easy to transport and carry into a home garden.

[Brief description of drawings]

FIG. 1 is a perspective view showing a main part of a shift operating device according to the present invention.

FIG. 2 is a side view of FIG.

FIG. 3 is a sectional view taken along the line AA of FIG.

FIG. 4 is a sectional view taken along the line BB of FIG.

FIG. 5 is a front view showing a guide groove of a guide plate.

FIG. 6 is a front view showing a partially changed guide groove.

FIG. 7 is a side view showing a bearing holder portion attached to a mission case.

FIG. 8 is an overall side view showing a tiller to which the present invention is applied.

[Explanation of symbols]

 1 gear shift lever 9 guide plate 10 guide groove 10a guide groove 10b guide groove 11 mobile agricultural machine

Claims (1)

[Claims] 1. A mobile agricultural machine 11 in which one shift lever 1 is guided in a guide groove 10 to switch between traveling shift and rotary shift, and the rotary shift guide grooves 10a, 1 are provided.
Reference numeral 0b is a shift guide plate structure in a mobile agricultural machine, which is arranged on both sides of the guide groove 10 for traveling shift.