JPH02127128A - Speed change gear for turning for ride type moving agricultural equipment - Google Patents

Abstract

PURPOSE:To make it possible to easily mount and demount without any shift in centering and to facilitate the systematization of types by installing input and output shafts of a speed change gear on a same axial line, and detachably fastening the case of the speed change gear on a rear axle case. CONSTITUTION:The cases 27a, 27b of a speed change gear 13 are rigidly fastened on a rear axle case 25 through a bracket 26, and a transmission shaft 12, an input shaft 29, an output shaft 30 and a transmission shaft 33 are arranged on a single line. All of them constitute a single transmission shaft. lt is not necessary, therefore, to perform centering with a universal shaft and the like when connecting the input and output shafts 29, 30 of the speed change gear 13, so the cost is reduced. Furthermore, when the speed change gear 13 for turning is not required, it can be replaced with a single transmission shaft, which makes it possible to easily systematize a passenger type planter into a deluxe type with the speed change gear 13 for turning and a standard type without it.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a turning transmission for a riding-type mobile agricultural machine, and more specifically to an input shaft and an output shaft of the transmission.

Regarding the arrangement and the arrangement of the case of the transmission.

(II) Conventional Technology Conventionally, when moving a four-wheel drive tractor or other mobile agricultural machine, the distance traveled by the front wheels and the distance traveled by the rear wheels match, of course, when traveling straight.
When turning, the travel distance of the rear wheels is shorter than that of the front wheels, so a front wheel speed increasing device is installed to increase the circumferential speed of the front wheels so that the front wheels are not pushed by the rear wheels. Some devices are configured so that the device operates in conjunction with the steering of the steering wheel.

However, in the above-mentioned conventional mobile agricultural machine, the circumferential speed of the front wheels increases when turning, which may pose a danger during turning operations, and also pose problems such as making turning operations difficult. was there.

(c) Problems to be solved by the invention Therefore, a switching gearbox is interposed between the transmission that transmits rotation to the front wheels and the transmission shaft between the rear wheels, and the gearbox is linked to steering operations when turning. It is conceivable that the transmission be changed to a low speed and the peripheral speed of the rear wheels to be slower than the peripheral speed of the front wheels at that time. If the transmission is installed independently on the aircraft body and its input shaft and output shaft are installed on the transmission and rear axle case, the transmission and rear axle will be misaligned if they are not installed very precisely on the traveling aircraft. An expensive universal joint is required to compensate for the misalignment, which may complicate the structure and increase manufacturing costs.

Furthermore, if, for example, a model with this transmission is classified as a deluxe type and a model without this transmission is classified as a standard type, there is a risk that this series will become complicated due to the complexity of the structure. There is.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a turning transmission for a riding type mobile agricultural machine that can be easily attached and detached without misalignment, and can facilitate the categorization of types, for example.

(d) Means for Solving the Problems The present invention has been made in view of the above-mentioned circumstances. For example, as shown in FIG. 1, the front wheel (2) and the rear wheel (3)
It transmits the rotation from the transmission (10) to the front wheels (2) and further transmits it to the rear wheels (3) via the transmission shafts (12), (33). 33) is equipped with a high/low two-stage switching gearbox in the middle! (13) is interposed,
and a riding type mobile agricultural machine (1) having a switching device (23) that switches the transmission device (13) from high speed to low speed in conjunction with the operation at the time of turning. The input shaft (29) and the output shaft (30) are provided on the same axis, and the case (
27a) and (27b) are removably fixed to the rear axle case (25) of the rear wheel (3).

(Based on the configuration with one or more effects, the input shaft (29) of the transmission (13)
) and the output shaft (30) are arranged on the same axis together with the transmission shafts (12) and (33).

In addition, the case (27a) (27b) of the transmission (13)
is fixed to the rear axle case (25).

Note that the above-mentioned symbols in parentheses do not limit the structure in any way.

(F) Examples Examples of the present invention will be described below with reference to the drawings.

First, as shown in FIG. 1, a riding type mobile agricultural machine to which the present invention is applied,
For example, the outline of the riding rice transplanter 1 will be explained.

The riding rice transplanter 1 has a running body 5 supported by front wheels 2 and rear wheels 3, an engine 6 is mounted on the front upper part of this running body 5, and a seat 7 is further arranged in the middle part. A driver's seat 9 is provided.

Also, a transmission 10 connected to the engine 6
is fixed to the front part of the traveling body 5, and the rotational force that is changed as appropriate by this transmission 10 is transmitted to the front axle 11.
The other signal is transmitted to the front wheels 2 via the transmission shaft 12 passing through the rear lower part of the transmission 10 to the turning transmission 13, and then transmitted to the rear wheels 3 via the rear axle 15 via the transmission 13.

Further, a parallel link supporting the rice planting section (not shown) is pivotally supported on a vertical member 5a installed upright on the traveling body 5, and the tip of the bracket 16a provided on the upper link 16 of this parallel link and the rear of the case of the transmission 10 A hydraulic cylinder 17 for raising and lowering the rice-planting section and its hydraulic ram 17a are pivotally supported at the lower side end, and this hydraulic ram 17a is disposed above the turning transmission 13.

Further, a pitman arm 19 is rotatably supported at the lower end of the case of the transmission 10.
is adapted to be linked to the rotation of the steering wheel 20.

Further, a shifter arm 22 is integrally attached to the pitman arm 19 and the shifter shaft 21 of the turning transmission 13.
A switching device 23 is provided for switching the turning gear 13 between a high gear and a low gear.

Next, the turning transmission 13 will be explained with reference to FIGS. 2 and 3.

25 is a rear axle case, and a turning time variable coupling W1 is attached to this rear axle case 25 via a bracket 26.
Case 27a that can be divided into two parts.

27b is removably fixed.

The input shaft 29 is supported on the case 27a, the output shaft 30 integrated with the gear 31 is supported on the case 27b, and the bevel gear 3
2, the transmission shaft 33 integrated with the bracket 26 and the case 27
b, and is attached to the output shaft 30 by a spline or the like so as to be slidable in the axial direction. Further, the input shaft 29 is connected to the power transmission shaft 12 from the transmission 10 via a spline joint 35. The transmission shaft 12, input shaft 29, output shaft 30, and transmission shaft 33 are arranged in a straight line, and the transmission shaft 36 is supported in parallel to the input shaft 29 by the cases 27a and 27b.

Further, a large gear 37 and a small gear 39 are integrally attached to the front and rear of the input shaft 29, and a gear 40 that meshes with the large gear 37 and a gear 41 that meshes with the small gear 39 are rotatably attached to the speed change shaft 36. A gear 42 that engages the gear 42 is attached to the transmission shaft 36 via a spline, and a dog clutch 43 is attached to the center of the transmission shaft 36 via a spline.

In addition, claws 45 and 46 are provided on both sides of the dog clutch 43, and claws 47 and 49 that oppose the claws 45 and 46 are provided on the gear 40 and 41, and a shifter 50 that engages with this dog clutch 43 is attached to the case. It is attached to the shifter shaft 21 which is pivotally supported by the shaft 27a.

In addition, the shifter 50 is provided with protrusions 51 and 52, and the protrusions 53 and 55 that come into contact with the protrusions 51 and 52 are attached to the case 2.
7b to restrict movement of the shifter 50. Further, when the vehicle is traveling straight, the shifter arm 22 is urged to rotate in the direction of the arrow in FIG.

Since the turning gear T113 is configured as described above, when the riding rice transplanter 1 is traveling straight, the transmission 13 is in the state shown in FIG.
transmission 1.
Transmission shaft 12, input shaft 29, large gear 37, gear 4 from 0
0, the rotational force from the transmission 10 is transmitted to the rear axle 15 via the dog clutch 43, the transmission shaft 36, the gear 42, the gear 31, the output shaft 30, the transmission shaft 33, and the bevel gear 32, and the rear wheel 3 has the same circumference as the front wheel 2. move forward at speed.

On the other hand, when the riding rice transplanter 1 turns, the shifter arm 22 is rotated in the direction of arrow B in FIG. The protrusion 52 of the shifter 50 rotates counterclockwise around the case 27.
b comes into contact with a protrusion 55 provided in b. At this time, the pawl 46 of the dog clutch 43 comes into contact with the pawl 49 of the gear 41. Therefore, the rotational force from the transmission 10 is transmitted to the transmission shaft 12, input shaft 29, gear 39, gear 41, transmission shaft 36,
The speed is decelerated and transmitted to the rear axle 15 via the gear 42, gear 31, output shaft 30, transmission shaft 33, and bevel gear 32,
The rear wheels 3 turn at a circumferential speed that is slower than the circumferential speed of the front wheels 2.

Therefore, the front wheels 2 of the riding rice transplanter 1 are not pushed by the rear wheels 3, allowing stable and easy steering operation, and the turning speed is reduced, making it easier to align rows when planting seedlings.

In addition, power for the hydraulic cylinder 17 that lifts the working part,
In a machine equipped with power steering, when making a turn that requires power for steering, the driving power is significantly reduced due to the low-speed turning, so the output of the mounted engine 6 can be significantly reduced.

Further, the rotation of the shifter arm 22 is restricted by the projection 51 or 52 coming into contact with the projection 53 or 55, whereby the engaging piece 50a of the shifter 50 to the dog clutch 43 is connected to the rotating dog clutch. 43 is prevented from coming into contact with strong pressure, and wear and tear of the engagement piece 50a can be prevented.

Further, the cases 27a and 27b of the transmission 13 are fixed to the rear axle case 25 via the bracket 26,
Since the transmission shaft 12, input shaft 29, output shaft 30, and transmission shaft 33 are arranged in a straight line, they all form one transmission shaft, so the input/output shaft of this transmission 13 is 2
When connecting 9.30, there is no need for alignment using a universal shaft, etc., and costs can be reduced. Furthermore, if the turning transmission 13 is not needed, it can be replaced with - transmission shafts.
This has the effect of making it easier to create a series of riding rice transplanters, such as a deluxe type that has this, and a standard type that does not.

Further, since the turning transmission 13 is located below the hydraulic ram 17a of the hydraulic cylinder 17, the hydraulic ram 17a can be protected from obstacles.

Next, the switching device 23 will be explained with reference to FIGS. 4 to 9. In FIG. 4 (bottom view) and FIG. 7 showing the straight running state, a length-adjustable rod 56 is pivoted to the pitman arm 19, facing approximately in the front-rear direction, and the front end of the rod 56 is pivoted. At the end, the tip of an arm 57a, in which arms 57a and 57b are integrally formed at substantially right angles to each other, is pivoted, and the bent portions of the arms 57a and 57b protrude downward from the traveling body 5, as shown in FIG. It is pivotally supported by a bottle 59.

Further, the arm 57b is formed into a bifurcated shape.
A cylinder 60 is pivotally supported on both sides of b, and this cylinder 60
A rod 61 is inserted through.

Furthermore, the left end of the rod 61 in FIG. 7 is a small diameter portion 81a.
A cylindrical body 62 shorter than the length of the small diameter part 81a is inserted into this small diameter part 61a, and a flange part 62a is provided on the outside of the intermediate part of this cylindrical body 62.
A compression spring 63 is interposed between 2a and a flange Blb provided at the end of the small diameter portion 61a.

Further, a flange portion 61c is provided so as to have a left end at a position longer than the length of the cylindrical body 60 from the stepped portion of the small diameter portion 61a, and the cylindrical body 60 is adapted to slide on the left side of this flange portion 61c. There is.

A pin 65 is provided at the right end of the rod 61 and extends downward, and the end of the shifter arm 22 is pivotally supported on this pin 65.

Further, a bin 66 projects downward from the traveling body 5, and a tension spring 67 is tensioned between the pin 66 and the cylindrical body 22a into which the bin 65 is fitted. In addition, in FIG. 4, 69 is a drag link.

Since the switching device 23 is configured as described above, the fourth
When the operator rotates the steering wheel 20 from the straight-ahead state shown in the figure, the pitman arm 19 follows and rotates, rotating the front wheel 2 in the desired direction via the drag link 69.
At the same time as the riding rice transplanter 1 turns in the required direction, the rod 5 is moved through the pitman arm 19 as shown in FIG.
6 is pulled forward and pin 59 is fixed to the traveling body 5
The arm 57a pivoted to rotates counterclockwise around the pin 59, and the cylinder 60 pivoted to the arm 57b slides to the left with respect to the rod 61, pressing the cylinder 62. ,
When the compression spring 63 is compressed (see FIG. 8), the biasing force that presses the flange portion 61b of the rod 61 to the left, which is biased by the compression spring 63, overcomes the biasing force of the tension spring 67 that pulls it to the right. Furthermore, at the point when the rod 61 overcomes the resistance force of the shifter arm 22 caused by the frictional force between the dog clutch 43 and the transmission shaft 36 during power transmission as shown in FIG. 2, the rod 61 moves the shifter arm 22 counterclockwise. Rotate.

When the shifter arm 22 begins to rotate counterclockwise, the friction between the dog clutch 43 and the gear shift shaft 36 changes to dynamic friction, and the resistance force of the shifter arm 22 suddenly decreases, causing the compression spring 63 to Due to the accumulated biasing force, the shifter arm 22 rapidly rotates counterclockwise, and the pawl 46 of the dog clutch 43 rapidly engages with the pawl 49 of the gear 41 by the shifter 50.

In addition, when returning the riding rice transplanter 1 from the turning state to the straight-ahead state, the pitman arm 19 moves the arm 57a to the fourth position.
The cylindrical body 60 rotates clockwise in the figure, thereby causing the cylindrical body 60 to come into contact with and press the flange portion 61c.

Then, the shifter arm 22, which begins to rotate clockwise in FIG.
At the point when the rod 61 overcomes the resistance force caused by the frictional force between the rod 61 and the transmission shaft 36, the rod 61 moves vigorously toward the right in the figure due to the biasing force of the tension spring 67 in the state shown in FIG. As a result, the arm 22 rotates vigorously, and the shifter 50 moves the pawl 45 of the dog clutch 43 into gear 4.
0's pawl 47 rapidly.

Therefore, since the claws 46 and 49 and the claws 45 and 47 are not half-engaged, the claws 46 and 49 and the claws 45.4
To improve the durability of the meshing part of a transmission by preventing the occurrence of abnormal noise and its loss during the period 7.

Further, as shown in FIGS. 7 and 9, a play C is provided between the cylinder body 60 and the cylinder body 62, and the swing angle of the pitman arm 19 is small, that is, at the beginning of turning or when moving straight. When the steering wheel 20 rotates slightly, the jitter arm 22 can be prevented from rotating.

Furthermore, since the shifter arm 22 is operated via the rod, the reliability of the operation can be ensured and the reliability of the operation can be improved.

Note that although the switching device 23 is linked to the steering wheel 20 in the above description, the hydraulic cylinder 1 that lifts the working part is
The switching device 23 may be linked to the operation of step 7.
In other words, it should be linked to what is operated when turning.

(G) As described in detail, according to the present invention, the transmission (13)
The input shaft (29) and output shaft (30) of the transmission shaft (12)
and (33) on the same line, and the rear axle case (25) is removably fixed.
If the transmission (13) is not needed, it can be easily removed.
It can be replaced with a single transmission shaft, and the installation of the transmission (13) does not require an expensive universal joint, thereby simplifying the structure and reducing production costs. . Therefore, it is possible to easily create a series of deluxe type, standard type, etc. of the riding type mobile agricultural machine (1).

[Brief explanation of drawings]

Fig. 1 is a side view of a riding type mobile agricultural machine embodying the present invention, Fig. 2 is a vertical side view showing an embodiment of the present invention, and Fig. 3 is a side view of a riding type mobile agricultural machine embodying the present invention.
4 to 9 show the switching device shown in FIG. 2, FIG. 4 is a plan view showing the state when traveling in a straight line, and FIG. 7 is a vertical sectional side view of a part of FIG. 4. , FIG. 5 is a plan view showing the state during turning travel, FIG. 8 is a longitudinal cross-sectional side view of a part of FIG. 5, and FIG. 6 is a plan view showing the state transitioning from turning travel to straight travel.
FIG. 9 is a longitudinal sectional side view of a portion of FIG. 6. 1... Riding type mobile agricultural machine 2... Front wheel 3.
...Rear wheel '10...Transmission 12
．． 33...Transmission shaft 13...Transmission device 23...
・Switching device 25 river rear axle case 27
a, 27b...Case 29-...Input shaft
30...output shaft

Claims (1)

[Claims] 1. It has a front wheel and a rear wheel, and transmits rotation from the transmission to the front wheel and further transmits it to the rear wheel via a transmission shaft,
A riding type mobile agricultural machine having a high/low two-speed switching transmission interposed between the transmission shaft and having a switching device that switches the transmission from high speed to low speed in conjunction with operation during turning. , A turning transmission device for a riding type mobile agricultural machine, characterized in that an input shaft and an output shaft of the transmission device are provided on the same axis, and a case of the transmission device is removably fixed to a rear axle case of the rear wheel. .