JP2919141B2 - Transmission structure in riding type field machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission structure for a riding type field working machine such as a riding type rice transplanter, a seeder, a fertilizer and the like.

[0002]

2. Description of the Related Art In general,
Among this kind of field working machine, there is a working interval adjusting mechanism for adjusting an interval of the field work, a traveling speed change mechanism for performing a shift of the body running, and a differential mechanism for performing a differential between left and right traveling wheels. Are provided in the same transmission. However, in the prior art, the working system intermediate shaft provided with the shifter gear for the working interval adjusting mechanism and the running system intermediate shaft provided with the shifter gear for the traveling speed change mechanism are provided in a plane in front or above the differential mechanism , for example, in the front-rear direction. The transmission had to be long in the front-rear direction, which was one of the factors that hindered the reduction of the length of the aircraft.

[0003]

SUMMARY OF THE INVENTION The present invention has been made with the object of providing a transmission structure in a riding type field working machine which can eliminate these disadvantages in view of the above situation. In addition, a transmission for transmitting engine power to the field working unit system and the body traveling unit system, a work interval adjusting mechanism for adjusting a work interval, and a traveling speed change for performing a speed change of the body traveling. In a riding type field working machine provided with a mechanism and a differential mechanism for performing a differential between left and right traveling wheels, a working system transmission shaft provided with the shifter gear for the working interval adjusting mechanism is provided with an engine.
At a position higher than the power input shaft and the engine power input.
The intermediate shaft of the traveling system, which is located between the shaft and the differential mechanism and is provided with the shifter gear for the traveling
Differential from the engine power input shaft at a position below the power shaft
The transmission transmission shaft, which is located between the transmission system and the transmission transmission mechanism to the differential mechanism, is located at a position below the traveling system intermediate shaft and is different from the traveling system intermediate shaft.
The power transmission path from the engine power input shaft to the gear provided on each of these shafts is located around the outer circumference of the differential mechanism on the engine power input shaft side.
It is characterized by being arranged substantially vertically .

According to the present invention, the transmission can be shortened in the front-rear direction as much as possible.

[0005]

Next, an embodiment of the present invention will be described with reference to the drawings. In the drawings, reference numeral 1 denotes a traveling machine of a riding type rice transplanter. The traveling machine 1 has an engine 2 mounted on the front side, and a rear, low and high seedling mount 3 and a traveling machine 1 on the rear side of the machine. The basic configuration is the same as in the prior art, such as that the planting work section 5 provided with various member devices such as the planting claw 4 that performs the planting operation in synchronization with the timing is mounted so as to be vertically movable.

On the other hand, reference numeral 6 denotes a transmission case in which the power from the engine 2 is inputted via the continuously variable transmission mechanism 7, and the present invention is applied to the transmission 8 housed in the transmission case 6. Have been. That is, the power from the engine 2, the driven pulley 7a of the continuously variable transmission mechanism 7 is integrally supported, and input <br/> transformer honey pivots Chillon case 6 rotatably supported by the engine power The input shaft 9 is provided with a main clutch mechanism 10 and a transmission gear 11, and the power input to the input shaft 9 is transmitted to the input shaft 9 via the main clutch mechanism 10. 11, the input shaft 9 is connected to the front wheel differential mechanism 1
It is arranged slightly above and in front of 2.

[0007] the transformer honey Chillon case 6, the working-system power transmission shaft 13 as described below, running-intermediate shaft 14, and is traveling transmission shaft 15 is parallel journaled the input shaft 9, respectively, The working system transmission shaft 13 is located above the input shaft 9 and between the input shaft 9 and the differential mechanism 12.
The traveling system intermediate shaft 14 is displaced toward the differential mechanism 12 so as to be located at a position lower than the input shaft 9 and is different from the input shaft 9.
The driving system transmission shaft 15 is biased toward the differential mechanism 12 so as to be located between the driving system 12 and the driving system intermediate shaft 1.
4 and the intermediate shaft 14 and the differential mechanism 12
Are provided so as to be deviated toward the differential mechanism 12 side so as to be located between them. A shifter gear 13a for planting work, that is, a shifter gear 13a for stock adjustment, is spline-fitted to the work system transmission shaft 13 so as to be movable in the axial direction, and a reverse intermediate gear 13b is integrally attached thereto. The shifter gear 13a for inter-stock adjustment is provided in the transmission case 6.
The transmission provided on the input shaft 9 by an axial movement of a shifter fork 16a provided on a shifter shaft 16 supported on the upper part of the shaft (for example, a movement based on an operation of an appropriate operating tool such as a stock shift lever, not shown). The gear 11 is selectively meshed with the gear teeth 11a and 11b having different numbers of teeth with the neutral being interposed therebetween.
The rotation speed can be changed in two steps. The power transmitted to the work system transmission shaft 13 is transmitted to a torque limiter 17 provided on the work system transmission shaft 13 and a bevel gear mechanism 1 provided between the work system transmission shaft 13 and the work system output shaft 18.
9, and transmitted to the work system output shaft 18 via the planting work clutch mechanism 20. In addition, 20a
Is a stopper for constantly keeping the work clutch mechanism 20 in a disconnected state.

On the other hand, at the left and right ends of the running system intermediate shaft 14, a main shifter gear 21 for performing a running shift is provided.
The shifter gears 22 for sub-transmission are spline-fitted so as to be movable in the axial direction, respectively. The transmission case 6 is provided on the left and right side walls of the transmission case 6 so as to substantially oppose each other at a position below and in front of the traveling system transmission shaft 15. The shifter gear 21 for main transmission moves in the axial direction based on a shift operation of a main transmission lever 25 to be described later, and is selectively sandwiched between one of the gear teeth 11a of the transmission gear 11 and the intermediate gear 13b for reverse movement. The forward and backward switching can be performed by meshing.

The auxiliary transmission shifter gear 22 is integrally provided with large and small gear teeth 22a and 22b having different numbers of teeth, and the traveling system transmission shaft 15 is provided with large and small transmission gears 15a having different numbers of teeth. , 15b are provided integrally. High speed and low speed two-stage running sub-shifting can be performed by selective gear engagement based on low-high speed shifting operation across the neutral position of the sub-shift lever 26. Further, the traveling system transmission shaft 15 is integrally provided with an output gear 15c that always meshes with the input gear 12a of the front wheel differential mechanism 12, and a bevel gear 15d for transmitting power to the rear wheel side. ing. And by being configured in this way,
Around the outer periphery of the differential mechanism 12 on the engine power input shaft 9 side.
Power transmission paths for the traveling system and the working system are provided along the vertical direction.

On the other hand, in this embodiment, the relationship between the continuously variable transmission mechanism 7 and the shifter shaft 23 with respect to the main transmission lever 25 is configured as follows. In other words, the bracket 27 is swingably supported on the continuously variable transmission support shaft 1a integrally protruded from the machine body side, and is further mounted on the bracket 27 in a direction orthogonal to the support shaft 1a. A main transmission support shaft 27a is provided facing the vehicle. And this spindle 2
An intermediate portion of the main transmission lever boss 25a is swingably provided at 7a. Further, a leading end of a swing arm 27b integrally projecting from the bracket 27 is linked to a shift rod 7b for performing a shift operation of the continuously variable transmission mechanism 7, and the main shift lever 25 is By swinging the continuously variable transmission support shaft 1a in the direction of arrow A in the center, the diameter of the pulleys of the pulleys constituting the continuously variable transmission mechanism 7 is changed, whereby the continuously variable traveling speed is achieved. Is set to

On the other hand, a guide pin 25 guided by a lever guide 28 is provided at the tip of the lever boss 25a.
b is provided. This guide pin 25b has approximately L
One end of a connecting plate 29 bent in the shape of a letter is provided, and the other end of the connecting plate 29 is integrally provided with one end of an operating rod 30 pivotally supported by the transmission case 6 in a swingable manner. Have been. The main shifting shifter shaft 23 is connected to the distal end of an operating arm 30a having a base end integrally provided at the other end of the operating rod 30, and the main shifting lever 25 is connected to the main shifting support shaft 27a. By swinging in the direction of arrow B as a fulcrum, the main shift shifter shaft 23
Move in the axial direction, whereby the forward / reverse speed change described above can be performed.

In the embodiment of the present invention constructed as described above, the transmission case 6 is provided with a working system transmission shaft 13 provided with a stock adjustment shifter gear 16 together with a front wheel differential mechanism 12, A transmission system intermediate shaft 14 provided with a shifter gear 21 for shifting and a shifter gear 22 for traveling sub-transmission, and a transmission provided with power transmission gears 15a and 15b for transmitting the traveling main and sub-shifted power to the differential mechanism 12. A shaft 15 is disposed, and among these shafts 13, 14, 15, the working system transmission shaft 13 is located above the input shaft 9 and the input shaft 9 and the differential mechanism 12
And the traveling system intermediate shaft 14 is
Is also at the lower position and between the input shaft 9 and the differential mechanism 12.
And the traveling system transmission shaft 15 is located below the traveling system intermediate shaft 14.
And the traveling system intermediate shaft 14 and the differential mechanism 12
, And a power transmission path via a gear provided on each of these shafts is provided on the input shaft 9 of the differential mechanism 12.
It becomes an arrangement structure along the length around the outer periphery of the side . As a result,
Without these power transmission paths trans honey Chillon 8 as in the conventional ones are planarly arranged in the longitudinal direction resulting in summer long in the front-rear direction, the outer periphery around the differential mechanism 12
And a compact arrangement that makes effective use of the space in the vertical direction between the input shaft 9 side and the transmission case 6 can be made lighter and more compact.
Cost reduction can be achieved along with weight reduction.

Further, in this embodiment, the main shifter shaft 2
3 and the shifter shaft 24 for sub-transmission are disposed below the intermediate shaft 14 of the traveling system and at a position in front of the transmission shaft 15 of the traveling system so as to face left and right.
The arrangement of No. 4 is reasonable and the installation space can be effectively secured in the dead space, so that a further reduction in weight and size can be achieved.

[0014]

In summary, since the present invention is constructed as described above, the power from the engine power input shaft is transmitted to the work system power transmission path via the work system transmission shaft provided with the shifter gear for the work interval adjusting mechanism. And a traveling system power transmission path via a traveling system intermediate shaft provided with a traveling transmission mechanism shifter gear and a traveling system transmission shaft provided with a power transmission gear for power transmission to a differential mechanism. , Each of these power transmission paths is the engine power of the differential mechanism.
Becomes positioned along the substantially vertical around the outer periphery of the input shaft, as a result, the transformer Mitsu Chillon resulting in summer long in the longitudinal direction as in the conventional ones these power transmission paths are planarly arranged for example in the longitudinal direction Therefore, a compact arrangement that effectively utilizes the vertical space around the outer periphery of the differential mechanism can be realized, and the transmission case can be reduced in weight and size.

[Brief description of the drawings]

FIG. 1 is a side view of a riding type rice transplanter.

FIG. 2 is an enlarged side view of a main part.

FIG. 3 is a developed sectional view showing a power transmission system of the transmission.

FIG. 4 is a developed sectional view showing a shifter portion of the transmission.

FIG. 5 is a rear view of the transmission.

FIG. 6 is a side view of a main transmission lever.

FIG. 7 is a rear view of the main transmission lever.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 traveling body 2 engine 6 transmission case 7 continuously variable transmission mechanism 9 input shaft 11 transmission gear 12 differential device 13 operating system transmission shaft 14 traveling system intermediate shaft 15 traveling system transmission shaft 16 shifter shaft 21 main shifter shifter gear 22 sub Shifter gears for shift 23 Shifter shaft 24 Shifter shaft 25 Main shift lever

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) A01C 11/02 313 F16H 3/08 F16H 57/02 511 F16H 63/24

Claims (1)

(57) [Claims] A transmission for transmitting engine power to a field working unit system and a machine traveling unit system, a work interval adjusting mechanism for adjusting a working interval, and a transmission for shifting the machine running. In a riding type field working machine provided with a traveling speed change mechanism and a differential mechanism for performing a differential between left and right traveling wheels, an operation power transmission shaft provided with a shifter gear for the operation interval adjusting mechanism includes an engine power input shaft. Above and
The traveling system intermediate shaft, which is provided between the engine power input shaft and the differential mechanism and in which the shift gear for the traveling speed change mechanism is provided, is located below the engine power input shaft and the engine
Is positioned between the emission power input shaft and the differential mechanism, further power transmission gear to the differential mechanism of the traveling transmission shaft provided from the traveling speed change mechanism, in the lower position of the running-intermediate shaft
And respectively provided <br/> by located between the said running-intermediate shaft and the differential mechanism, the power transmission path from the engine power input shaft to the gear provided on each of these axes, the engine power of the differential mechanism Outer circumference on input shaft side
A transmission structure in a riding-type field working machine, wherein the transmission structure is disposed so as to extend substantially vertically.