JPS6018985Y2 - Walking type mobile agricultural machine - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a mobile agricultural machine, such as a walk-behind cultivator, in which a control bundle is configured to be changeable forward and backward relative to a traveling machine body.

In the above-mentioned mobile agricultural machine, as the nozzle orientation is changed, the forward direction of the machine body is reversed from before the direction change, and the forward speed change operation position and reverse speed change operation position by the traveling speed change lever also change.
Since the direction of the bundle is opposite to the state before changing, there is a risk of tampering with the operation.Also, in general, in devices that can be multi-speed shifted, when the knob is in the normal direction, the number of forward gears is the same as the number of reverse gears. Therefore, the number of forward gears cannot be increased when the bundle is reversed, and the range of the attached working device is limited.

As a means to solve this problem, we have installed a forward/reverse switching mechanism in addition to the gear change mechanism for multi-stage forward/reverse shifting, so that when the bundle direction is reversed, the direction of rotation of the axle output can be automatically or artificially reversed. It is being considered to do so.

However, conventionally, this type of structure, for example,
As shown in Publication No. 9-3009N, a well-known three-axis forward/reverse switching mechanism is used in which a driving shaft, a passive shaft, and a reversing shaft supported parallel to each other are interlocked with gears.
The mission case became larger.

Furthermore, in order to equip a forward/reverse switching mechanism with this structure, the transmission case itself had to be completely changed.

The present invention is a complete device that allows the forward/reverse switching mechanism to be installed in a compact manner and can also be installed in a ready-made transmission case.

Hereinafter, embodiments of the present invention will be described based on the drawings.

FIG. 1 shows an overall side view of the walk-behind cultivator, in which a rotary rotor is connected via a hitch 5 to the rear of a traveling body 4 in which an engine 3 is mounted on the front part of a transmission case 2 which pivotally supports wheels 1.1. A tilling device 6 is connected, and a control handle 7 is attached to the upper end of the mission case 2 so as to be rotatable and fixed around the vertical axis 1, and a gear shift lever 8 extends from the mission case 2 so as to be changeable in the forward and backward direction. It's being served.

Figure 2 shows the input section of mission case 2.
An auxiliary case 10 containing a forward/reverse switching mechanism 9 is attached to the side surface of the transmission case 2, and one end of an input shaft 11 horizontally supported by the transmission case 2 is inserted into the auxiliary case 10.

Further, a driving shaft 12 connected to the engine 3 by a belt is horizontally supported in the auxiliary case 10, and the driving shaft 12 and the input shaft 11 are disposed concentrically buttingly facing each other.

In the auxiliary case 10, bevel gears 13 and 14 are fixedly opposed to the driving shaft 12 and the input shaft 11, respectively, and a bevel gear 15 that constantly meshes with both the bevel gears 13 and 14 is arranged concentrically with the input shaft center. It is rotatably supported by a rotating ring 16 via a support shaft 17.

Further, this free-rotating bevel gear 15 is provided with another gear portion 18, and a transmission collar 1 that can be freely engaged and detached is attached to this gear portion 18.
9 is spline-fitted to the outer circumference of the input shaft side bevel gear 14 so as to be shiftable.

Further, a gear-shaped locking portion 2 is provided on the outer circumference of the rotating ring 16.
0 is provided, and a retainer 21 that can be freely engaged and detached from this locking portion 20
is pivotably attached to the auxiliary case 10 about a fulcrum 22.

This retainer 21 is also engaged with the transmission collar 19, and when the retainer 21 is disengaged from the locking portion 20 of the rotating ring 18 as shown in FIG. As a result, the bevel gear 15 becomes unable to perform its autobiography, and the driving shaft 12 and the input shaft 11 are engaged with the bevel gear 13.
, 14 and 15, and the input shaft 11 is driven to rotate integrally with the driving shaft 12 (normal rotation input state), and as shown in FIG. In the state where the rotation ring 16 is prevented from rotating by being engaged with the portion 20,
The transmission collar 19 is disengaged from the gear portion 18, and the bevel gear 15 becomes able to rotate at a fixed position, and as a result, the input shaft 1
1 is configured to be in a state where it is driven in the opposite rotation to the driving shaft 12 (reverse rotation input state).

Further, as described above, one end of the retainer 21 in the forward/reverse switching mechanism 9 disposed around the driving shaft 12 and the input shaft 11 is inserted into the mission case 2 and is connected to the end thereof. An operating rod 23 projects above the transmission case 2 and is biased by a spring 24 to project.

Further, a cam plate 25 that acts on the protruding end of the operating rod 23 is fixed to the base end of the operating handle 7 attached to the upper surface of the mission case 2, so that the operating handle 7 is in the normal position (solid line in FIG. 1). ), the operating rod 23 is pushed down by the cam plate 25 as shown in FIG.
2 and the input shaft 11 to bring about the normal rotation input state, and when the control handle 7 is in the forward and backward reverse position (shown by the imaginary line in Fig. 1), the operating rod is connected as shown in Fig. 3. 2
3 is configured to allow upward protrusion to bring about the reversal input condition.

According to the above configuration, the forward and backward multi-stage shifting of the gear change lever 8 when the control handle 7 is in the normal position is maintained as is even when the control handle 7 is reversed.

FIG. 4 shows another embodiment of the forward/reverse switching mechanism 9. In this case, a shift gear 27 having a retaining portion 26 at the end thereof is spline-fitted to the driving shaft 12, and the input shaft 11 is fitted with a shift gear 27 having a retaining portion 26 at the end thereof. An internal gear 29 having an engaging part 28 facing the engaging part 26 is fixed, and this internal gear 29 is always engaged with an idle gear 31 which is rotatably supported on the auxiliary case 10 via a support shaft 30. There is.

The shift gear 27 is configured to be able to engage with the idle gear 31. In this engaged state, the engaging parts 26 and 28 are disengaged, and when the retaining parts 26 and 28 are engaged, the shift gear 27 and the idle gear 31 are engaged with each other. The gear 30 is configured to be disengaged.

Incidentally, the shift operation of the shift gear 27 is performed manually using a shift lever 32 attached to the auxiliary case 10.

According to the above configuration, when the operating handle 7 is in the normal position, the shift gear 27 is shifted to the right and the engaging portions 26, 28
By engaging and connecting the two, the driving shaft 12 and the input shaft 11 are rotated together in a normal rotation input state, and when the handle is reversed, the shift gear 27 is shifted to the left as shown in FIG. 31, a reverse input state is obtained in which the input shaft 11 is driven in the reverse direction.

In addition, in this case, the input shaft 11 is connected to the shift gear 27 at the time of reverse rotation input.
It will be decelerated and driven by the tooth number ratio of the internal gear 29.
When the steering wheel direction is reversed, the speed is shifted forward and backward in the same number of stages as when the steering wheel direction is normal, but the overall speed is reduced.

As explained above in the embodiments, the present invention provides a walking-type mobile agricultural machine in which the control handle can be changed forward and backward relative to the traveling machine, and one end of the input shaft supported by the traveling transmission case is connected to the traveling transmission case. A driving shaft that protrudes to the outside of the case and is interlocked with the engine and driven in a fixed direction is disposed concentrically butt-opposed to the end of the input shaft of the portion that protrudes to the outside of the traveling transmission case. In addition, an auxiliary case that supports the driving shaft and covers the protruding portion of the input shaft is attached to the outside of the traveling transmission case, and further, inside the auxiliary case, there is provided a housing for receiving the rotational power of the driving shaft. It is characterized by being equipped with a forward/reverse switching mechanism that switches between forward and reverse directions and transmits the signal to the input shaft, so the driving shaft, input shaft, and reversing shaft are arranged parallel to each other, and forward/reverse rotation can be performed by gear switching. Compared to the conventional three-axis forward/reverse switching structure, the input power can be forward/reverse reversed with a more compact structure, making it possible to perform the same forward/reverse multi-speed shifting regardless of the steering wheel orientation.

In addition, in this forward/reverse switching mechanism, the driving shaft is concentrically butted against the outside of the input shaft, so if the end of the input shaft protrudes from the transmission case, the comparison It is possible to easily attach the switching structure to the outside of the transmission case, and it is easy to change the specifications to enable switching of input power between forward and reverse directions without major modification of the ready-made transmission case.

Furthermore, by arranging the driving shaft of the forward/reverse switching mechanism to coaxially butt against the outside of the input shaft of the transmission case, the structure can be made more compact than a three-axis forward/reverse switching mechanism. Therefore, the case that covers the forward/reverse switching mechanism has been made smaller, and since the case supports the driving shaft of the forward/reverse switching mechanism, when the case is attached or removed, the space outside the forward/reverse switching mechanism is reduced. Exposure and partial disassembly are possible, making inspection and repair easier.

[Brief explanation of drawings]

The drawings show an embodiment of the walking-type mobile agricultural machine according to the present invention, in which Fig. 1 is an overall side view, Fig. 2 is a longitudinal sectional front view of the main part in the forward rotation input state, and Fig. 3 is a longitudinal sectional view of the main part in the reverse rotation input state. The front view and FIG. 4 are longitudinal sectional front views of main parts of another embodiment. 2...Mission case, 3...Engine, 4...Traveling body, 7...Control handle, 9...Forward/reverse switching mechanism , 10...
...Auxiliary case, 11...Input shaft, 12...
・・・・Driving axis.

Claims (1)

[Scope of Claim for Utility Model Registration] ■ In a walking type mobile agricultural machine in which the control knob 7 is configured to be changeable in the forward and backward directions relative to the traveling body 4, one end side of the input shaft 11 supported by the traveling mission case 2 is provided. While projecting to the outside of the traveling transmission case 2,
A driving shaft 12 that is interlocked with the engine 3 and driven in a fixed direction is arranged so as to protrude outside the traveling transmission case 2 and coaxially butt against the end of the input shaft 11, and this driving shaft An auxiliary case 10 that supports the input shaft 12 and covers the protruding portion of the input shaft 11 is attached to the outside of the traveling transmission case 2.
A walking type mobile agricultural machine characterized in that a forward/reverse switching mechanism 9 is provided inside the drive shaft 12 for switching the rotational power of the driving shaft 12 between forward and reverse directions and transmitting the rotational power to the input shaft 11. (2) The walking type mobile agricultural machine according to claim 1, wherein the forward/reverse switching mechanism 9 is configured to be automatically switched in conjunction with changes in the forward/backward direction of the control handle 7.