JPH0338979Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an improvement of a transmission installed in a riding part of a riding working machine such as a riding rice transplanter or a riding direct sowing machine.

(Prior Art) A riding rice transplanter, which is constructed by mounting a planting section on a riding section equipped with an engine, is known, for example, from Japanese Patent Application Laid-Open No.
This riding type rice transplanter is described in Japanese Patent No. 137810, and a transmission for transmitting power to the front and rear wheels of the riding part and the planting part is installed in the front part of the riding part.

(Problem to be solved by the invention) By the way, in the above-mentioned conventional riding rice transplanter, the transmission is located above between the left and right front wheels, but the rear wheel drive shaft and the planting part drive shaft of the transmission are Naturally, since the input shaft and transmission gear shaft are all located behind the front wheel drive shaft, the weight of each of these shafts and the gears and pulleys attached to them is biased toward the rear of the transmission.
This has the disadvantage of disrupting the front-to-back balance of the aircraft. Particularly, in riding rice transplanters that have a structure in which a large number of seedlings are placed on a seedling stand in the planting section, the front wheels tend to lift up during the seedling planting process, causing problems in the work.

In addition, in the above transmission, the bearings for each shaft are located behind the front wheel drive shaft, and the engagement mechanism for the rear wheel transmission shaft and the working part transmission shaft is built into that part, so the transmission case is attached to the front wheel drive shaft. It has a shape that protrudes further to the rear, which occupies a large amount of space within the aircraft, which poses a problem when trying to downsize the aircraft.

(Means for solving the problem) Therefore, the present invention arranges the rear wheel drive shaft and the working part drive shaft in front of the front wheel drive shaft, and arranges the rear wheel transmission shaft and the working part transmission shaft in front of the front wheel drive shaft. The above-mentioned problem is solved by meshing with the rear wheel drive shaft and working part drive shaft located at the rear wheel drive shaft and the working part drive shaft, respectively, and by extending these rear wheel transmission shaft and working part transmission shaft to the rear of the transmission case. It is.

(Function) The power input from the engine to the transmission is transmitted to the front wheel drive shaft, rear wheel drive shaft, and working part drive shaft through the transmission mechanism inside the transmission.
The power is transmitted from the front wheel drive shaft to the front wheels, from the rear wheel drive shaft to the rear wheels via the rear wheel transmission shaft meshed with it, and to the working section via the working section drive shaft meshed with the working section drive shaft. Ru.

In the transmission structure according to the present invention, the rear wheel drive shaft and the working part drive shaft are arranged in front of the front wheel drive shaft, and the meshing part of the rear wheel transmission shaft and the working part transmission shaft is located in front of the front wheel drive shaft. Therefore, most of the weight of the transmission is received in front of the front wheel drive shaft, that is, in front of the front wheels of the passenger traveling section. Therefore, the front-rear balance based on the rear wheel of the passenger running section is good, and even if the working part attached to the passenger running section is heavy,
The front wheels do not float up, and the aircraft runs stably. Therefore, the work will not be hindered. Further, since there is no drive shaft or the like behind the front wheel drive shaft of the transmission, the transmission case does not protrude rearward and its rear surface is flat. Therefore, in the passenger traveling section, the transmission does not protrude rearward between the left and right front wheels, making it possible to downsize the vehicle.

(Example) FIG. 1 shows a riding rice transplanter as an example of a riding working machine. Reference numeral 1 denotes a riding traveling section, and 2 denotes a planting section. The planting section 2 is attached to the riding traveling section 1 so as to be movable up and down by a mounting device 3, thereby configuring a riding rice transplanter. The passenger traveling section 1 has left and right front wheels 4 and rear wheels 5 at the front and rear thereof, an engine 6 is mounted on the front part, and a transmission 7 is provided above between the left and right front wheels 4. There is. 8 is a mission case. 9 is a driver's seat, 10 is a steering wheel, and steering wheel 10 is a steering shaft 1;
1 is inserted into the front part of the transmission case 8 and meshed with the sector gear 12.

In the above-mentioned transmission 7, as shown in FIG.
5. The rear wheel drive shaft 16, the working part drive shaft 17, and the hydraulic mechanism drive shaft 18 are arranged near the input shaft 14, and the working part drive shaft 17 and the rear wheel drive shaft 16 are connected to the front wheel drive shaft. 13 and approximately equidistant from the front wheel drive shaft 13. 1
9 is a rear wheel transmission shaft, 20 is a working part transmission shaft,
The rear wheel transmission shaft 19 is meshed with the rear wheel drive shaft 16, and the working part transmission shaft 20 is meshed with the working part drive shaft 17, respectively, and the meshing position of these is located in front of the front wheel drive shaft 13. The working part transmission shaft 20 extends rearward through the upper part of the front wheel drive shaft 13, and the rear wheel drive shaft 16 passes through the lower part of the front wheel driving shaft 13, respectively, and the working part transmission shaft is divided into upper and lower parts and extends rearward. 20 is connected to the input shaft of the planting section 2, and the rear wheel transmission shaft 19 is connected to the input section of the rear wheel 5. The input shaft 14 of the mission 7 and the output shaft 21 of the engine 6 are interlocked by a transmission belt 22, and 23 is a tension clutch thereof. 24 is a gear shift lever.

The transmission system of the transmission 7 and its related mechanisms is shown in FIG. That is, the transmission gears 25 and 26 are attached to the input shaft 14 of the transmission gear 7, and the transmission gears 25 and 26 are selectively meshed with fixed gears 27 and 28 fixed to the transmission gear shaft 15. It is something. The other fixed gear 29 of the speed change gear shaft 15 is always meshed with the differential ring gear 30 of the front wheel drive shaft 13, and power is transmitted to the left and right front wheels 4 via the front wheel drive shaft 13. There is. Also, differential ring gear 3
Power is also transmitted to the fixed gear 31 of the rear wheel drive shaft 16, which is always in mesh with the rear wheel drive shaft 16, and the left and right rear wheels 5 are driven via the rear wheel drive shaft 19, the bevel gear 32, and the side clutch 33. ing. A hydraulic pump 34 constitutes a hydraulic mechanism, and this hydraulic pump 34 is interlocked with the hydraulic mechanism drive shaft 18. Selective meshing between the idling gear 35 of the hydraulic mechanism drive shaft 18 and the speed change gear 25 of the input shaft 14, and constant meshing between the idling gear 36 integrated with the idling gear 35 and the fixed gear 27 of the speed change gear shaft 15. This causes the vehicle to travel backwards. The working part drive shaft 17 is provided with a speed change gear 37, and the speed change gear 37 and the fixed gears 38, 39 of the input shaft 14 are selectively engaged with each other.
Furthermore, the working part drive shaft 17 is driven at variable speeds by engagement of the fixed gear 40 of the input shaft 14 with the free rotating gear 41 which is always in mesh with the clutch 42. A working part drive shaft 17 is installed in the planting part 2.
Power is transmitted from there through the torque limiter 43, bevel gear 44, working part clutch 45, and working part transmission shaft 20. Note that the hydraulic mechanism drive shaft 18 is linked to the output shaft 21 of the engine 6 via a transmission belt 46.

In the configuration as described above, the transmission 7 is arranged above between the left and right front wheels 4 of the passenger traveling section 1, but the front wheel drive shaft of the transmission 7 is located at the rear thereof, and the input shaft 14 and the transmission gear shaft 15,
The working part drive shaft 17 and the rear wheel drive shaft 18 are all assembled in front of the front wheel drive shaft 13, and the rear wheel drive shaft 15, the rear wheel transmission shaft 19, and the working part drive shaft 17
Since the meshing positions of the working part transmission shaft 20 and the working part transmission shaft 20 are also located in front of the front wheel drive shaft 13, the transmission case 8 does not protrude rearward, and the weight of the transmission 7 is distributed at the front of the transmission case 8. Concentrate on. Therefore, the front-rear balance based on the rear wheel 5 of the passenger traveling section 1 becomes good, and even if the planting section 2
Even if a long seedling platform 47 is provided at the front and rear as shown in FIG. It can run stably and work smoothly. Moreover, the transmission case 8 does not protrude rearward, and the working part transmission shaft 20 and rear wheel drive shaft 2
0 are disposed vertically in the rear space of the transmission case 8, which is extremely advantageous in reducing the size of the passenger traveling section 1.

Although a riding rice transplanter is shown as an embodiment of the present invention, if a sowing section is attached to the riding traveling section 1 in place of the planting section 2, it becomes a riding direct sowing machine.

(Effects of the invention) As mentioned above, the present invention consists of a passenger traveling section and a working section attached to it, and power is provided from the engine to the front part of the passenger traveling section and to the front and rear wheels of the passenger traveling section and the working section, respectively. In a riding machine in which a transmission transmission shaft is arranged, the rear wheel drive shaft and the working part drive shaft are arranged in front of the front wheel drive shaft, and the rear wheel transmission shaft and the working part transmission shaft are arranged in front of the front wheel drive shaft. Since the rear wheel drive shaft and the working part drive shaft are meshed with the located rear wheel drive shaft and the working part drive shaft, and the rear wheel transmission shaft and the working part transmission shaft are extended to the rear of the transmission case, most of the weight of the transmission is transferred from the front wheel drive shaft. In addition to the front, that is, in front of the front wheels of the passenger running section, it is possible to maintain a good front-rear balance based on the rear wheels of the passenger running section, and when the weight of the working section attached to the passenger running section is large. Even when the front wheels are floating, the machine can run stably and work can be carried out smoothly, and the transmission does not protrude rearward, and the rear wheel transmission shaft and working part transmission shaft are Since it fits in the rear space of the transmission, it has the effect of making the aircraft smaller.

[Brief explanation of the drawing]

Fig. 1 is an overall side view of a riding rice transplanter showing an embodiment of the present invention, Fig. 2 is an enlarged vertical cross-sectional view of the same transmission part, and Fig. 3 is an exploded view showing the transmission system of the transmission and related mechanisms. be. In the figure, 1 is a passenger traveling part, 2 is a planting part, 4 is a front wheel, 5 is a rear wheel, 7 is a transmission, 8 is a transmission case, 13 is a front wheel drive shaft, 14 is an input shaft, 16
17 is a rear wheel drive shaft, 17 is a working part drive shaft, 19 is a rear wheel transmission shaft, 20 is a working part transmission shaft, 22 is a transmission belt, 23 is a tension clutch, and 24 is a speed change lever.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) Consisting of a passenger running section and a working section attached to it, power is transmitted from the engine to the front part of the passenger running section and to the front and rear wheels of the passenger running section and the working section, respectively. In a riding machine in which a transmission is arranged, the rear wheel drive shaft and the working part drive shaft of the transmission are arranged in front of the front wheel drive shaft, and the rear wheel transmission shaft and the working part transmission shaft are arranged in front of the front wheel drive shaft. 1. A transmission structure for a riding working machine, which meshes with a rear wheel drive shaft and a working part drive shaft located at the rear wheel drive shaft and a working part drive shaft, respectively, and extends the rear wheel transmission shaft and the working part transmission shaft to the rear of the transmission case. (2) The transmission structure for a riding working machine according to claim 1, wherein the rear wheel transmission shaft and the working part transmission shaft are divided into upper and lower parts of the front wheel drive shaft and extend rearward.