JPH0354524B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a rice paddy working vehicle such as a riding rice transplanter or a riding submerged seeder for paddy fields, and specifically relates to the body structure of the paddy working machine.

(b) Prior Art Generally, in a riding rice transplanter, a planting device is supported via a link device at the rear of a traveling body suspended by wheels, and there is no space between the planting device and the body. It is configured to be lifted and lowered by an installed hydraulic cylinder device. Conventionally, the hydraulic cylinder device is installed between the central portion of the traveling machine body and the shock absorber 7 via a bracket.

(c) Problems to be Solved by the Invention For this reason, relatively short hydraulic cylinder devices are used, their strokes are short, and the pressing output is large, and the hydraulic cylinder devices are located in the center of the machine body. I need a sturdy horizontal frame to attach it to. Therefore, a large force acts on each member related to the hydraulic cylinder device, so each part requires a strong and large member, and since the force acting on the fulcrum and the like is also large, friction is also large. Furthermore, the planting device is delicately controlled to move up and down along the rice field by sensing soil pressure using floats, but because the hydraulic cylinder stroke is short, the play in each member has a large effect on the control.
This is one of the factors that deteriorates the oil pressure sensing performance.

(d) Means for solving the problem Therefore, the present invention aims to solve the above-mentioned problems. For example, as shown in FIGS. 1 to 4, the traveling body 5 The front transmission case 13 located at the two front wheels, the rear transmission case 15 located at the three rear wheels, and the two transmission cases 13 and 15 are connected and connected at a predetermined interval in the width direction of the fuselage. It consists of two frames 16, 16 extending in the front and rear direction, and furthermore, a hydraulic cylinder device 32 is interposed between the front transmission case 13 and the link device at the center of these frames 16, 16. It is characterized by:

(e) Effect Based on the above configuration, the rotation of the engine 6 is transmitted to the transmission in the front transmission case 13,
It drives the front wheels 2 and is also transmitted to the transmission in the rear transmission case 15 via the travel transmission shaft 24 to drive the rear wheels 3. At the same time, the planting device 11 is driven via the planting transmission shaft 30 extending from the front planting case 13 to perform the planting work. The frames 16, 16 and the transmission shaft 2 are disposed to the left and right from the center of the fuselage.
1, 30, a long hydraulic cylinder device 32 is installed in the central part of the traveling body 5 and almost straddles the front and rear wheels 2, 3 without interfering with the frame and the transmission shaft. Device 1
The planting device is controlled to move up and down with a long stroke of the hydraulic cylinder device compared to the amount of lift in step 1.

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

As shown in FIGS. 1 and 2, 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 frame 4, and a driver's seat 9 is disposed such that a seat 7 is located between the front and rear wheels, that is, at the center of gravity of the machine. Further, at the rear of the traveling body 5, a planting device 11 is supported so as to be able to rise and fall freely via a parallel link device 10 consisting of an upper link 10a and a lower link 10b, and the planting device 11 has a large number of planters 12... A float 8 and a long seedling stand 14 on which two and a half pine seedlings can be vertically placed are provided.

The traveling body 5 has a front transmission case 13 disposed at two front wheels and a rear transmission case 15 disposed at three rear wheels.
15 are connected and connected by two frames 16, 16 each having a rectangular cross-sectional pipe structure and extending in the longitudinal direction of the fuselage at a predetermined interval in the width direction of the fuselage. In addition, the front transmission case 13 has an input pulley 17 installed on one side to transmit power from the engine 6 to the transmission inside the case, and front axles 19 are connected and supported on both sides of the case. front wheel 2
is suspended vertically and power is transmitted to the front wheels. On the other hand, as shown in detail in FIG. 4, the rear transmission case 15 has left and right axle cases 20,
20 and a connecting case 21, the vehicle case 2
A rear wheel axle 3a is supported on the rear wheel 3, and rotation from a travel transmission shaft 24 is transmitted to the rear wheel 3 via a shaft inside the case 15 and the transmission case.
Further, seat posts 22, 22 are erected from the frames 16, 16, respectively, and the seat 7 is rotatably and fixedly installed on a seat base 25 fixed to the upper ends of these posts 22. Also,
A bracket 26 is installed to bridge the lower portions of both frames 16, 16, and a connecting case 21 of the rear transmission case 15 is attached to the bracket 26 via a mounting bracket 27. Furthermore, the shaft 2 extends across the posts 22, 22.
8 is fixed, and the link device 1 is fixed to the shaft 28.
0 uplink 10a is pivotally supported. Further, short shafts 29, 29 are fixedly provided at the bottom of the post 22, protruding outward from both sides.
A lower link 10b is pivotally supported on each of the lower links 9.

The front transmission case 13 has a third
As shown in detail in the figure, frames 16, 16 are fixed at symmetrical positions with respect to the center line c-c, and a planted power transmission shaft 30 is placed on one side of the center line c-c above the frame 16. is arranged, and a traveling transmission shaft 21 is arranged below the frame 16 on the other side of the center line c-c, and furthermore, a pin 31 is used to provide vertical swing on the center line c-c below the frame 16. The cylinder ends of a hydraulic cylinder device 32 having a small diameter and a long stroke are movably connected to each other. The planting transmission shaft 30 extends rearward parallel to the frame 16, is supported by a bearing 33 installed on one of the seat posts 22, and is further connected to the planting device via a universal joint 35 and a propeller shaft 37. 11. Further, the traveling power transmission shaft 21 also extends parallel to the frame 16 and is connected to the rear transmission case 15. The hydraulic cylinder device 33 extends slightly upward on the center line c-c, and its piston tip is inserted between two bracket plates 36, 36 fixed to the upper link 10a via a pin 37. connected.

Since this embodiment has the above configuration, the rotation of the engine 6 is controlled by the input pulley 1 via the belt B.
7, the speed is appropriately changed by the transmission in the front transmission case 13, and the transmission is transmitted to the front wheels 2, the traveling power transmission shaft 24, and the planting power transmission shaft 30. Further, the power is transmitted to the transmission in the rear transmission case 15 via the travel transmission shaft 24, driving the rear wheels 3 in synchronization with the front wheels 2, and the rice transplanter 1 runs. At the same time, the planted transmission shaft 30 and the universal joint 3
5 and the propeller shaft 37, power is transmitted to the planting device 11, and the planter 12, seedling stand 14, etc. are driven, and planting work is performed. At this time, hydraulic control is performed based on the vertical movement of the float 8 so that a constant planting state is maintained regardless of the unevenness of the tiller.
The hydraulic cylinder device 32 expands and contracts to delicately control the elevation of the planting device 11, but since the hydraulic cylinder device 32 has a small diameter and a long stroke, the stroke of the cylinder device is smaller than the amount of elevation of the planting device 11. Long and delicate control can be performed easily and reliably. Moreover, in order to turn the rice transplanter 1 at the edge of the field, the hydraulic cylinder device 32 is extended and the planting device 11 is raised. At this time, the hydraulic cylinder device 3
2 consists of a long stroke, so the link device 10
It is sufficient that the force acting on the pins 31, 37,
Each connecting member such as the bracket plate 36 can be made small and lightweight, and the friction of each pin, the pivot shafts 28, 29 of the link 10, etc. can be reduced.

Although the above-mentioned embodiment has been described with respect to a riding rice transplanter, it is of course applicable to other rice paddy work vehicles such as a riding rice field seeding machine.

(g) Effects of the Invention As explained above, according to the present invention, the hydraulic cylinder device 32 includes the frame 16 and the transmission shaft 2.
4 and 30, and one end is attached to the front transmission case 13, and the long one is such that it extends approximately over the front end 2 and the rear wheel 3. Therefore, as the stroke of the hydraulic cylinder device 32 becomes longer, the hydraulic pressing force becomes smaller, and the members 31, 37, and 36 related to the cylinder device can be made smaller and lighter, and the pivot member can be made smaller. 31,
37, 28, 29 friction can be reduced,
Furthermore, delicate lifting and lowering control of the planting device 11 by sensing soil pressure can be easily and accurately performed with less influence of backlash and the like. In addition, the hydraulic cylinder device 3
2 is located in the center, and the frame 16 and the transmission shafts 24, 30 are arranged with approximately equal weight balance on the left and right sides, so that the left-right balance of the aircraft can be maintained well, improving the straight-line performance of the aircraft. , the tipping angle also increases. Furthermore, since one end of the hydraulic cylinder device 32 is attached to the front transmission case 13 made of a sturdy member, there is no need for a special horizontal frame, and the hydraulic cylinder device can be made with a small diameter, making it compact. It is possible to achieve reduction in size and weight.

[Brief explanation of drawings]

Fig. 1 is an overall side view showing a riding rice transplanter according to an embodiment of the present invention, Fig. 2 is a plan view thereof, Fig. 3 is a sectional view taken along the line shown in Fig. 1, and Fig. 4 is a view taken along the arrow in Fig. 1. It is. 1... Riding paddy work vehicle (riding rice transplanter), 5...
Traveling aircraft, 6... Engine, 9... Driver's seat, 10
... Link device, 11 ... Planting device, 13 ... Front transmission case, 15 ... Rear transmission case, 16 ... Frame, 24 ... Travel transmission shaft,
30... Planted power transmission shaft, 32... Hydraulic cylinder.

Claims (1)

[Scope of Claims] 1. A passenger car comprising a running machine equipped with an engine in the front and a driver's seat arranged behind the engine, and supporting a paddy field working device so as to be able to rise and fall via a link device. In the paddy field working vehicle, the traveling body includes a front transmission case located at the front wheel portion, a rear transmission case located at the rear wheel portion, and a space at a predetermined interval in the width direction of the body that connects and connects both transmission cases. It consists of two frames that are separated and extend in the front and back direction of the aircraft.
The riding paddy field work vehicle is further characterized in that a hydraulic cylinder device is interposed between the front transmission case and the link device at a central portion of the frame.