JPS5837213Y2 - Differential case for riding rice transplanter - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of the differential case of a four-wheel drive type riding rice transplanter.

As a riding rice transplanter, a planting machine is attached to the rear of a four-wheel drive vehicle that drives a pair of left and right front wheels and rear wheels via a lifting device L7. Some have a spare seedling tank installed.

In this rice transplanter, the center of gravity of the rice transplanter as a whole in the longitudinal direction is biased towards the rear no matter how L7. Therefore, an engine unit is installed at the front of the running vehicle to maintain balance. It is attached to the front of the vehicle to maintain the front-to-back balance of the entire rice transplanter.

Furthermore, the front and rear wheels are equipped with a differential mechanism, and the case is usually made of cast metal, which increases the weight, especially in the rear wheel differential.
The rear of the differential case bulges toward the rear of the aircraft [7], causing the center of gravity of the aircraft to shift further to the rear.

Since this type of rice transplanter is generally used in paddy fields that have been plowed, it is necessary that the weight be as light as possible and well balanced, and improvements are desired.

The present invention was developed in consideration of the above-mentioned circumstances, and aims to improve the front-rear balance of the entire rice transplanter by moving the front and rear center of gravity of the rice transplanter as far forward as possible, even slightly. The purpose is to provide a differential case with a

For this purpose, the present invention is particularly characterized in that the case housing the differential mechanism of the rear wheel axle does not bulge rearward, but instead has a recessed portion toward the front of the fuselage.

Hereinafter, one embodiment of the present invention will be specifically described with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a running vehicle body, and this running vehicle body 1
The vehicle is equipped with a pair of left and right front wheels 2 and a rear wheel 3, and the front and rear wheels 2, 3 are driven by an engine unit 4 installed at the front of the vehicle body.

A planting machine 6 is attached to the rear end of the traveling vehicle body 1 via a lifting device 5 .

The planting machine 6 is a conventionally known machine that includes a float 7, a seedling tank 8, a planting body 9, and the like.

Further, a spare seedling tank 10 is provided above the rear part of the traveling vehicle body 1, and its support mechanism 11 supports the preliminary seedling tank 10.
Keep the tank almost horizontal at all times, and use the spare seedling tank 1 when supplying seedlings.
0 is tilted backwards so that the end of the reserve seedling tank and the end of the seedling tank 8 are communicated with each other, and the reserve seedlings on the reserve seedling tank 10 are slid into the seedling tank 8 for replenishment. That's what I do.

A differential mechanism 12 shown in FIG. 2 is attached to the axle 3a of the rear wheel 3.
is provided.

This differential mechanism 12 includes a bevel gear 14 fixed to a driving shaft 13.
and meshes with a bevel gear 16 provided on an intermediate shaft 15 parallel to the axle.
A gear 20 is fixed to the intermediate shaft 15 at a predetermined interval, and a gear 2 is fixed to the axle 3a.
1 are meshed with each other to transmit power to the axle 3a.

The differential mechanism 12 is housed in a differential case 22 shown in FIGS. 2 to 5.

The differential case 22 is formed by casting, and mainly consists of a shaft cylinder part 22a that covers the left and right axles 3a, and a differential part case 22b that covers the differential part.
A recess 23 is formed in 2b so as to fit into the gap between the gears 21, 21.

In a conventional differential case, this recess 23 bulges rearward, and its wall thickness is thick and heavy. However, in the present invention, by forming the recess 23, the wall thickness can be reduced and the weight can be reduced. This is what I did.

In addition, since the recessed portion 23 protrudes 7 toward the front side of the fuselage, the center of gravity in the longitudinal direction is moved to the front of the fuselage.

In the present invention, the washer 24 of the hydraulic cylinder 5a of the lifting device 5 is integrally provided in the recess 23, but the washer 24 does not necessarily need to be provided in this position, and as shown in FIG. 23 may be formed into a complete space.

In such a configuration, when the rice transplanter is introduced into a paddy field and planting work is performed, if the recess 23 is formed in the differential case 22 of the rear wheel axle 3a, the rice transplanter will move as much as the weight of the differential case 13 is reduced. The weight of the rice transplanter can be reduced, and the center of gravity is moved to the front of the rice transplanter, resulting in better balance and better running performance.

Furthermore, by improving the weight balance between the front and rear of the rice transplanter, the driving force of the four-wheel, single-drive system will also be improved.

Furthermore, in the present invention, the washer 24 of the hydraulic cylinder 5a of the lifting device 5 can be provided at the recess 23 position, so that the installation space can be saved effectively.

As explained above, according to the differential case of the present invention, it is possible to reduce the weight of the differential case, which tends to be bulky, in a four-wheel drive type riding rice transplanter, and move the center of gravity of the machine forward, thereby reducing the overall weight of the rice transplanter. This has the effect of making it possible to drive in a well-balanced and stable manner.

[Brief explanation of the drawing]

Figure 1 is a side view of the entire rice transplanter showing an example of the present invention.
Figure 2 is a cross-sectional plan view of the differential mechanism and differential case of the rear wheel axle, Figure 3 is a side view of the differential case, Figure 4 is a rear view of the same, Figure 5 is a sectional view taken along the line A-A in Figure 4, and FIG. 6 is a partial cross-sectional plan view showing another embodiment of the present invention. 1... Running vehicle body, 2... Front wheels, 3...
...Rear wheel, 3a...Axle, 4...
Engine unit, 5... Lifting device, 5a...
... Hydraulic cylinder, 6 ... Planting work machine, 1
2...Differential mechanism, 13...Driving shaft, 1
4...Bevel gear, 15...Intermediate shaft, 16
...Bevel gear, 17 ... Pinion shaft, 18 ... Pinion, 19 ... Side gear, 20, 21 ... Gear, 22.・・・・・・
・Differential case, 22a...Shaft cylinder part, 22b...
...Differential case, 23...Recess, 24.
...Washer.

Claims (1)

[Scope of utility model registration request] In a riding rice transplanter in which a planting machine is attached to the rear of a running vehicle that drives a pair of left and right front wheels and a rear wheel through a lifting device, a differential mechanism provided on the rear wheel axle is provided. In this system, an intermediate shaft parallel to the axle is provided between the driving shaft and the rear wheel axle, a pair of gears are provided on the rear wheel axle that mesh with a pair of gears provided at a predetermined interval on the intermediate shaft, and the differential mechanism A differential case for a riding rice transplanter, characterized in that the case housing the rear wheel axle is formed with a recess that is located between the shaft cylinder parts that cover the rear wheel axle and enters a gap between gears provided on the rear wheel axle.