JP3372441B2 - Paddy field machine frame structure - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a frame structure of a paddy field working machine such as a riding type rice transplanter, and more specifically, a pair of right and left sheet metal press blanks are joined together to form a cylindrical shape that extends in the front-rear direction. In addition, by extending at least one of the pair of left and right sheet metal pressing materials upward, a pair of left and right main frames in which a vertical wall-shaped vertical frame portion having a wide width in the front-rear direction is formed at the rear side is provided. Side frames are arranged on both left and right sides of the frame at intervals respectively, and a front connecting frame for connecting the front end of the main frame and the front end of the side frame is provided, and the vertical frame portion and the side frame of the main frame are provided. The present invention relates to a structure in which a pair of left and right rear connecting frames that connect the rear ends are provided.

[0002]

2. Description of the Related Art In the frame structure of this type of paddy working machine, since the sheet metal press material forming the main frame and the vertical wall-shaped vertical frame portion are integrated, the pipe material is combined to form the vertical frame portion on the main frame. The number of parts is significantly reduced compared to the structure that stands upright like a tower, and since the main frame is constructed in the shape of a pipe along its longitudinal direction, it does not compare with the old main frame made of pipe material. Can bring strength. That is, it is possible to reduce the number of components while obtaining sufficient strength, and to simplify and reduce the weight of the main frame structure.

As such a frame structure, a frame structure as shown in FIG. 9 is known. That is,
A side frame SF having a downward U-shaped cross section is provided, and the front end of the side frame SF and the front end of the main frame MF are connected by a front connecting frame FF, and the rear end of the side frame SF and the vertical direction of the main frame MF. The frame portion Fh and the frame portion Fh are connected by a rear connecting frame BF.

[0004]

However, according to the above-mentioned conventional technique, in connecting the side frame to the main frame, the connecting portion between the main frame and the front connecting frame,
A connecting portion between the side frame and the front connecting frame, a connecting portion between the side frame and the rear connecting frame, a connecting portion between the rear connecting frame and the vertical frame portion is formed, and rigidity and strength are improved by reducing the connecting portion. There was room for improvement in terms of improving productivity.

An object of the present invention is to reduce the number of connecting parts.

[0006]

The features, functions and effects of the first invention according to claim 1 are as follows.

[Characteristics] A pair of left and right sheet metal press blanks are joined together to form a cylinder having a posture along the front-rear direction, and at least one of the pair of left and right sheet metal stamp blanks is extended upward to be rear A pair of left and right main frames with vertical wall-shaped vertical frame parts formed in the front-rear direction are provided at the side parts, and side frames are arranged at both left and right outer sides of these main frames, respectively. A frame of a paddy working machine provided with a front connecting frame that connects the front end of the frame and the front end of the side frame, and a pair of left and right rear connecting frames that connect the vertical frame portion of the main frame and the rear end of the side frame. In the structure, the side frame and the rear connecting frame are integrally formed by bending a round pipe material.

[Operation] According to the first aspect of the invention, the side pipe and the rear connecting frame are integrally formed by bending the round pipe material, paying attention to the fact that the round pipe has good bending workability. Therefore, it is possible to eliminate the connecting portion by welding the side frame and the rear connecting frame.

[Effect] Therefore, according to the first aspect of the present invention, the strength and rigidity of the frame can be easily improved without providing a separate reinforcing member, and the number of connecting works by welding or the like can be reduced, thereby improving the productivity. Can be improved.

Features and functions of the second invention according to claim 2
The effects are as follows.

[Characteristics] In the above characteristics of the first invention,
The vertical frame portion is formed with a locking portion for locking and mounting electrical components.

[Operation] In the second aspect of the present invention, focusing on the fact that the vertical frame portion is made of the sheet metal press material, the vertical frame portion is formed with the locking portion for mounting electrical equipment locking. Therefore, the structure for mounting the electrical component lock can be created at the same time when the main frame is created, and the work of separately attaching the lock tool to the vertical frame portion is unnecessary.

[Effect] Therefore, according to the second aspect of the present invention, it is possible to form the locking portion for locking and mounting the electrical component with good workability.

Features, operations, and features of the third invention according to claim 3
The effects are as follows.

[Characteristics] In the characteristics of the first invention and the second invention described above, a shaft that penetrates the left and right main frames in series is fixed to the main frame, and one of the end portions of the shaft protruding from the main frame. One is configured as a fulcrum shaft of a clutch system link mechanism that links its operating tool to a work clutch, and the other is configured as a fulcrum shaft of a speed change system link mechanism that links its operating tool to a traveling transmission. In point.

[Operation] According to the third aspect of the present invention, one end of the shaft fixed to the main frame in a state of penetrating through the left and right main frames in series is used as the fulcrum shaft of the clutch link mechanism. Since the other end is configured as the fulcrum shaft of the speed change system link mechanism, and its operating tool is linked to the work clutch, and its operating tool is linked to the traveling transmission, one shaft is formed. The fulcrum shaft of the clutch link mechanism and the fulcrum shaft of the speed change system link mechanism can be configured simply by fixing the main frame to the main frame, and the shaft acts as a member that connects the main frames to each other to connect the main frames. Can be reinforced.

[Effect] Therefore, according to the third aspect of the present invention, the fulcrum shaft of the clutch system link mechanism and the fulcrum shaft of the speed change system link mechanism can be constructed with good workability, and at the same time, the structure and strength of the main frame can be simplified. I can improve.

Features, operations, and features of the fourth invention according to claim 4
The effects are as follows.

[Characteristics] In the characteristics of the first invention, the second invention, and the third invention, the vertical frame portion of one main frame is formed by extending one of the right and left sides of the sheet metal press material upward. However, one of the left and right sides of the sheet metal press material is extended upward to form the vertical frame portion of the other main frame.

[Operation] According to the fourth aspect of the present invention, while adopting an inexpensive means such that one of the left and right sheet metal press blanks is extended upward to form a vertical frame portion,
In the left and right main frames, the vertical frame portions are formed by extending the sheet metal press materials on the same left and right sides upward, so that the left and right main frames can have the same specifications.

[Effect] Therefore, according to the fourth aspect of the invention, it suffices to create one type of specification as the main frame,
The cost can be reduced.

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION As shown in FIG. 1, a riding type rice transplanter, which is an example of a paddy working machine, has a seedling planting device 3 equipped with a seedling stand 3A at the rear of a riding type self-propelled aircraft body 1. Link mechanism 2
And a hydraulic cylinder 4 for driving and raising and lowering the seedling planting device 3.

The self-propelled vehicle body 1 has a structure in which a driving part 14 is provided in front of a driving part including a driver's seat 11, a steering wheel 12 and a driving step 13, and a pair of left and right rear wheels 5 are provided. Airframe frame 6 with axle case 5A that is pivotally supported
The rear part of the mission case 8 pivotally supporting a pair of left and right front wheels 7 is connected to the front part of the vehicle, and a metal (iron, etc.) step-in / step-out step 9 located on both left and right sides of the driving part 14 is cantilevered forward. It has a frame structure that is connected in a shape. The rear wheels 5 are drive wheels, and the front wheels 7 are steering drive wheels. The engine 15, which is the main body of the drive unit 14, is mounted on the mission case 8.

As shown in FIG. 2, the main structure of the machine body frame 6 includes a pair of left and right main frames MF in a posture along the front-rear direction, and a left and right outer side of each of the main frames MF. The arranged side frame SF is provided, the square pipe-shaped front connecting frame FF that connects the front ends of the main frame MF and the side frame SF is provided, and the rear portion of the main frame MF and the side frame SF positioned laterally outside thereof are provided. And a rear connecting frame BF for connecting the two.

As shown in FIGS. 3, 6 and 7, the left and right main frames MF are both formed into a cylindrical shape by joining a pair of left and right sheet metal press blanks a and b together and extending in the front-rear direction. A vertical frame portion having a vertical wall shape which is configured and has a wide width in the front-rear direction at a rear side portion by extending one of the left and right sheet metal stamping materials a and b upwardly. It is configured to form Fh. To the rear portion of the vertical frame portion Fh, a U-shaped reinforcing plate C that forms a vertically oriented cylindrical columnar body with this rear portion is fixed. The vertical frame portion Fh is formed in a three-dimensional structure by punching the central portion to the other side of the left and right to increase the rigidity.

Further, the both vertical frame portions Fh are shown in FIG.
As also shown in FIG. 5, the locking portion is formed on one of the left and right sides and the vertical frame portion Fh on the other side of the locking portion
Is a locking portion 100 for locking and mounting the electrical component D.
Has become. The electrical component D is equipped with a relay switch for a motor for rolling the seedling planting device 3 with respect to the link mechanism 2.

As described above, the left and right main frames MF are configured to have the same specifications and are manufactured by the same mold.

In addition to the front connecting frame FF, the left and right main frames MF extend between the upper frame member Fu extending between the upper portions of the left and right vertical frame portions Fh and the front upper and lower central portions of the left and right vertical frame portions Fh. The front frame member Ff and the left and right vertical frame portions Fh are connected by a shaft S that passes through the lower ends of the front portions in series.

In addition, in order to support the corresponding one of the pair of left and right top links 2A of the link mechanism 2 above and below the left and right vertical frame portions Fh so as to be swingable up and down about the left and right axis P1. A boss portion 101 is fixed, and a link support shaft 102 for supporting a corresponding one of the pair of left and right lower links 2B of the link mechanism 2 so as to be vertically swingable around a horizontal axis P2 is provided at a lower portion. It is fixed.

Further, as shown in FIG. 3, pedal support shafts 103, 103 are provided at the front portions of the left and right main frames MF, respectively.
104 is fixed. Left or right pedal support shaft 103
Is for supporting the traveling clutch pedal 21 (see FIG. 1), and the other left and right pedal support shafts 104 are left and right for braking corresponding ones of the pair of left and right steering brakes for rear wheels. It supports a pair of steering brake pedals (not shown).

As shown in FIGS. 3 and 4, one of the end portions of the shaft S protruding from the main frame MF is operated by a planting clutch 105 (an example of a working clutch) provided inside the mission case 8. A fulcrum shaft 109 of a relay link 108 of a clutch system link mechanism 107 that links the lever 106
The other is, as shown in FIGS. 3 and 5, the fulcrum shaft 11 of the relay link 113 of the speed change system link mechanism 112 that links the operating lever 111 of the travel speed change device 110 to the fulcrum shaft 11.
4 is configured. The operation lever 106 for the planting clutch 105 doubles as the raising / lowering operation lever for operating the control valve V for the hydraulic cylinder 4, that is, the control lever mounted on the main frame MF. It is attached to the valve V. The traveling transmission 110 can perform two-stage gear shifting by selectively turning on and operating two belt tension clutches provided over the output shaft 15a of the engine 15 and the input shaft 8a of the transmission case 8 and having different transmission ratios. It is a sub-transmission device that transmits the power of the engine 16 to the transmission case 8 by turning on one of the belt tension clutches, and cuts off the transmission by turning off both belt tension clutches. It is configured.

The side frame SF and the rear connecting frame BF are integrally formed by bending a round pipe material, as shown in FIG. Also, the side frame S
U has a step plate 115 for getting on and off at the lower end of F.
The character-shaped step frame 116 is connected and fixed, and the step frame 116 is connected to the main frame MF via the reinforcing frame 117. That is, the side frame SF
Is connected to the main frame MF even in the middle in the front-rear direction.

As shown in FIG. 2, a seat Z1 for mounting the mission case 8 is formed at the front end of the main frame MF, and an axle case 5A is provided at the rear part.
A seat Z3 for mounting the vehicle is formed, and seats Z2 for mounting the step 9 for getting on and off are formed at both left and right ends of the front coupling frame FF.

The driving portion 14 is covered with an engine bonnet 17 made of synthetic resin and arranged on the opening 16 of the front step 9.

A rear cover 18 made of synthetic resin is mounted on the machine body frame 6, and the rear cover 18 has left and right rear wheel fender portions 18A whose outer edges are supported by the side frames SF. The driver's seat mounting portion 18B and the driving step portion 1 forming the driving step 13
It is constructed as an integrated structure connected by 8C. The driver seat mounting portion 18B is supported by the vertical frame portion Fh of the main frame MF, and the driving step portion 18C is supported by the front portion of the side frame SF, the front portion of the main frame MF, and the front connecting frame FF.

In the machine body frame 6, the respective members are joined by welding.

[Other Embodiments] In the above embodiment, the left and right main frames MF have the same specifications, but the left and right main frames MF may be symmetrical in shape.

[Brief description of drawings]

[Figure 1] Side view of a riding rice transplanter

FIG. 2 is a perspective view of a body frame.

FIG. 3 is a plan view of the main frame.

FIG. 4 is a side view of a clutch link mechanism.

FIG. 5 is a side view of a speed change system link mechanism.

FIG. 6 is a perspective view of a main frame.

FIG. 7 is a vertical sectional front view of the main frame.

FIG. 8 is a perspective view of the main part of the main frame.

FIG. 9 is a perspective view of a conventional body frame.

[Explanation of symbols]

a Sheet metal press material b Sheet metal press material Fh vertical frame part MF main frame SF side frame FF front connection frame BF rear connecting frame S axis 100 locking part 105 Working clutch 106 operation tools 107 Clutch system link mechanism 109 fulcrum axis 110 traveling transmission 111 Operation tool 112 Transmission link mechanism 114 fulcrum axis

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-8-216706 (JP, A) JP-A-10-14333 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) A01C 11/02 B62D 49/00

Claims (4)

(57) [Claims] 1. A pair of left and right sheet metal press blanks are joined together to form a tubular shape that extends in the front-rear direction, and at least one of the pair of left and right sheet metal stamp blanks is extended upward to form a rear side. A pair of left and right main frames with vertical wall-shaped vertical frame parts formed in the front-rear direction are provided at the positions, and side frames are arranged at both left and right outer sides of these main frames, respectively. A frame structure of a paddy working machine in which a front connecting frame for connecting the front end of the side frame to the front end of the side frame is provided and a pair of left and right rear connecting frames for connecting the vertical frame part of the main frame and the rear end of the side frame are provided. The frame structure of a paddy working machine, wherein the side frame and the rear connecting frame are integrally formed by bending a round pipe material. 2. The frame structure for a paddy work machine according to claim 1, wherein a locking portion for locking and mounting an electric component is stamped and formed on the vertical frame portion. 3. A clutch system in which a shaft, which penetrates the left and right main frames in series, is fixed to the main frame, and one of the ends of the shaft protruding from the main frame is connected to a working clutch with its operating tool. The frame structure for a paddy work machine according to claim 1 or 2, wherein the fulcrum shaft of the link mechanism is formed, and the other is formed as a fulcrum shaft of a speed change system link mechanism that links an operation tool of the link transmission mechanism. 4. The vertical frame portion of one main frame is formed by extending one of the right and left sides of the sheet metal press material upward, and the other main frame is formed by extending one of the left and right sides of the sheet metal press material upward. The frame structure for a paddy work machine according to any one of claims 1 to 3, wherein the vertical frame portion is formed.