JPH10210814A - Frame structure for paddy field work machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce connection parts so as to improve rigidity, strength and productivity. SOLUTION: For this frame structure of a paddy field work machine, a pair of left and right main frames MFs constituted in the cylindrical shape of a posture along front and back directions by joining a pair of left and right metal plate pressing materials (a) and (b) for forming the vertical frame parts Fh of a vertical wall shape wide in the front and back directions at a rear side part by extending at least one of the pair of the left and right metal plate pressing materials (a) and (b) upwards are provided, side frames SFs are arranged at respective parts with an interval on both left and right outer sides of the main frames MFs, a front connection frame for connecting the front end of the main frame MF and the front end of the side frame SF is provided and a pair of left and right rear connection frames BFs for connecting the vertical frame part Fh in the main frame MF and the rear end of the side frame SF are provided. In this case, the side frame SF and the rear connection frame BF are integrally formed by bending and working a round pipe material.

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 working machine such as a riding type rice transplanter, and more particularly, to a cylindrical structure having a pair of left and right sheet metal press materials joined together in a longitudinal direction. In addition, a pair of left and right main frames is formed by extending at least one of the pair of left and right sheet metal press materials upward to form a wide vertical wall-shaped vertical frame portion in the front-rear direction at the rear side. A side connection frame is provided at each of the left and right outer sides of the frame with a space therebetween, and a front connection frame for connecting a front end of the main frame and a front end of the side frame is provided, and a vertical frame portion and a side frame of the main frame are provided. The present invention relates to a structure in which a pair of left and right rear connection frames for connecting the rear end of the frame are provided.

[0002]

2. Description of the Related Art In a frame structure of a paddy working machine of this kind, since a sheet metal press material constituting a main frame and a vertical frame portion having a vertical wall shape are integrated, a vertical frame portion is formed on the main frame by combining pipe materials. The number of parts is greatly reduced compared to the structure of standing up in the shape of a tower, and the main frame is configured in a pipe shape along its longitudinal direction, so it is comparable to the old main frame made of pipe material. Can bring strength. In other words, it is possible to reduce the number of parts while obtaining sufficient strength, thereby simplifying and reducing the weight of the main frame structure.

[0003] As such a frame structure, a structure configured as shown in FIG. 9 is known. That is,
A side frame SF having a downward U-shaped cross section is provided, a front end of the side frame SF is connected to a front end of the main frame MF by a front connection frame FF, and a rear end of the side frame SF is vertically connected to the main frame MF. The frame portion Fh is connected to the rear connection frame BF.

[0004]

However, according to the above-mentioned prior art, when the side frame is connected to the main frame, a connecting portion between the main frame and the front connecting frame is required.
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 are 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 portions.

[0006]

The features, functions and effects of the first aspect of the present invention are as follows.

[Features] A pair of left and right sheet metal press materials are joined to form a tubular shape in a posture along the front-rear direction, and at least one of the pair of left and right sheet metal press materials is extended upward to form a rear part. A pair of left and right main frames each having a wide vertical wall-shaped vertical frame portion formed in the front-rear direction is provided at a side position, and side frames are disposed at left and right outer sides of these main frames at intervals. A paddy working machine frame provided with a front connection frame connecting a front end of a frame and a front end of a side frame, and a pair of left and right rear connection frames connecting a vertical frame portion of the main frame and a rear end of the side frame. In this structure, the side frame and the rear connection frame are integrally formed by bending a round pipe material.

[Action] In the first aspect of the invention, attention is paid to the fact that the round pipe has good bending workability, and the side frame and the rear connecting frame are integrally formed by bending the round pipe material. Therefore, it is possible to eliminate a connection portion due to welding between the side frame and the rear connection frame.

[Effects] Therefore, according to the first aspect of the present invention, the strength and rigidity of the frame can be simply improved without providing a separate reinforcing member, and the number of connection operations such as welding is reduced, thereby improving productivity. Can be improved.

According to the second aspect of the present invention, the features, actions,
The effects are as follows.

[Features] In the features of the first invention,
The vertical frame portion is formed by stamping and forming a locking portion for locking and mounting an electrical component.

[Operation] In the second aspect of the invention, attention is paid to the fact that the vertical frame portion is made of a sheet metal stamping material, and a locking portion for locking and mounting electrical components is stamped out on the vertical frame portion. Therefore, the structure for locking and mounting the electrical components can be created at the same time when the main frame is formed, and it is not necessary to separately attach the locking tool to the vertical frame portion.

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

According to the third aspect of the present invention, the features, actions,
The effects are as follows.

[Features] In the features of the first and second aspects of the present invention, a shaft which penetrates the left and right main frames in a series is fixed to the main frame, and an end of the shaft protruding from the main frame is provided. One is configured as a fulcrum shaft of a clutch link mechanism that links the operation tool to the work clutch, and the other is configured as a fulcrum shaft of a transmission link mechanism that links the operation tool to the traveling transmission. On the point.

[Operation] According to the third aspect of the present invention, one end of the shaft fixed to the main frame and projecting from the main frame while passing through the left and right main frames in series is connected to the fulcrum shaft of the clutch link mechanism. Since the other end is formed as a fulcrum shaft of the transmission link mechanism, the operating tool is linked to the working clutch, and the operating tool is linked to the traveling transmission, so that one shaft The fulcrum shaft of the clutch system link mechanism and the fulcrum shaft of the speed change system link mechanism can be configured by simply fixing the main frame to the main frame, and the shaft acts as a member for connecting the main frames, thereby connecting the main frames. Can be reinforced.

[Effects] 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 configured with good workability, and the strength and rigidity of the main frame can be simplified. Can be improved.

According to the fourth aspect of the present invention, the features, actions,
The effects are as follows.

[Features] In the features of the first invention, the second invention, and the third invention, one of the left and right sides of the sheet metal press material is extended upward to form a vertical frame portion of one main frame. Then, one of the left and right sides of the sheet metal press material is extended upward to form a vertical frame portion of the other main frame.

[Operation] According to the fourth aspect of the invention, inexpensive means such as forming a vertical frame portion by extending one of the left and right sheet metal press materials upward is adopted,
Since the left and right main frames have the vertical frame portions formed by extending the left and right same-side sheet metal press materials upward, the left and right main frames can have the same specifications.

[Effects] Therefore, according to the fourth aspect of the invention, it is sufficient to create one type of specification as the main frame.
Cost can be reduced.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, a riding type rice transplanter, which is an example of a paddy field working machine, has a seedling mounting device 3 provided with a seedling rest 3A at the rear of a riding type self-propelled body 1. Link mechanism 2
And a hydraulic cylinder 4 for driving and raising and lowering the seedling planting device 3.

The self-propelled body 1 has a structure in which a driving unit 14 is provided at the front of a driving unit having a driver's seat 11, a steering handle 12, and a driving step 13, and a pair of right and left rear wheels 5 is provided. Airframe 6 provided with pivotally supported axle case 5A
The rear of the transmission case 8 supporting a pair of left and right front wheels 7 is connected to the front part of the vehicle, and the steps 9 for getting on and off the metal (such as iron) located on both left and right sides of the driving part 14 are cantilevered forward. It has a frame structure 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 component of the driving unit 14, is mounted on the transmission case 8.

As shown in FIG. 2, the main structure of the body frame 6 includes a pair of left and right main frames MF arranged in a front-rear direction, and a left and right outside of the main frames MF spaced apart from each other. The main frame MF and the front connection frame FF in the shape of a square pipe connecting the front ends of the main frame MF and the side frames SF are provided. And a connecting frame BF is provided.

As shown in FIGS. 3, 6 and 7, the left and right main frames MF are formed by joining a pair of left and right sheet metal press materials a and b into a tubular shape having a posture along the front-rear direction. The left and right sheet metal press material a of the pair of left and right sheet metal press materials a and b is extended upward to form a vertical frame portion having a wide vertical wall shape in the front-rear direction at a rear portion. It is configured to form Fh. A U-shaped reinforcing plate C that forms a vertical cylindrical column with the rear portion is fixed to the rear portion of the vertical frame portion Fh. The vertical frame portion Fh is formed in a three-dimensional structure by embossing a central portion on the left and right sides, thereby increasing rigidity.

Further, the two vertical frame portions Fh are provided in FIG.
As shown in FIG. 5, the locking portion is formed by stamping 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.
It has become. The electrical component D is provided 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 formed by the same mold.

The left and right main frames MF extend between the front connecting frame FF, the upper frame material 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 penetrates through the front lower end portions in a series.

On the upper part of each of the left and right vertical frame portions Fh, a corresponding one of a pair of left and right top links 2A of the link mechanism 2 is supported so as to be vertically swingable around a left-right axis P1. A boss portion 101 is fixed, and a link support shaft 102 for vertically supporting a corresponding one of a pair of left and right lower links 2B of the link mechanism 2 around a left-right axis P2 is fixed below the boss portion 101. It is fixed.

Further, as shown in FIG. 3, a pedal support shaft 103,
104 is fixed. Left or right pedal support shaft 103
Supports the traveling clutch pedal 21 (see FIG. 1). The other left and right pedal support shafts 104 are used to brake the corresponding one of the pair of left and right steering brakes for the rear wheels. It supports a pair of steering brake pedals (not shown).

One end of the shaft S protruding from the main frame MF is connected to a planting clutch 105 (an example of a working clutch) provided inside the transmission case 8 as shown in FIGS. The fulcrum shaft 109 of the relay link 108 of the clutch link mechanism 107 for linking the lever 106
The other is a fulcrum shaft 11 of a relay link 113 of a transmission link mechanism 112 for linking an operation lever 111 of the transmission 110 to the traveling transmission 110 as shown in FIGS.
4. The operation lever 106 for the planting clutch 105 also serves as a raising and lowering operation lever for operating the control valve V for the hydraulic cylinder 4 for raising and lowering the seedling planting device 3, and the control lever mounted on the main frame MF. Attached to valve V. The traveling transmission 110 is capable of two-stage shifting by selectively engaging and operating two belt tension clutches having different transmission ratios provided between the output shaft 15a of the engine 15 and the input shaft 8a of the transmission case 8. The transmission of the engine 16 is transmitted to the transmission case 8 by setting one of the belt tension clutches to the engaged state, and the transmission is cut off by setting both belt tension clutches to the disengaged state. It is configured.

As shown in FIG. 2, the side frame SF and the rear connection frame BF are integrally formed by bending a round pipe material. Also, the side frame S
F has a U with a step board 115 for getting on and off attached to the lower end.
A letter-shaped step frame 116 is connected and fixed, and the step frame 116 is connected to the main frame MF via a 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 transmission case 8 is formed at a front end of the main frame MF, and an axle case 5A is provided at a rear portion.
A seat Z3 for attaching the step 9 for getting on and off is formed at both left and right ends of the front connection frame FF.

The prime mover 14 is covered with an engine bonnet 17 made of synthetic resin disposed on the opening 16 of the front step 9.

A rear cover 18 made of a synthetic resin is mounted on the body frame 6, and the rear cover 18 has left and right rear wheel fenders 18A whose outer edges are supported by the side frames SF. The driver's seat mounting part 18B and the driving step part 1 forming the driving step 13
It has an integral 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 connection frame FF.

The members of the body frame 6 are joined by welding.

[Alternative Embodiment] In the above embodiment, the left and right main frames MF have the same specifications. However, the left and right main frames MF may have right and left symmetric shapes.

[Brief description of the drawings]

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

FIG. 2 is a perspective view of an airframe.

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

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

FIG. 5 is a side view of a transmission link mechanism.

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

FIG. 7 is a longitudinal sectional front view of a main frame.

FIG. 8 is a perspective view of a main part of a 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 connection frame S axis 100 Locking part 105 Work clutch 106 Operating tool 107 Clutch link mechanism 109 Support shaft 110 Travel transmission 111 Operating tool 112 Transmission link mechanism 114 Support shaft

Claims (4)

[Claims] 1. A pair of left and right sheet metal press materials are joined to form a tubular shape in a posture along the front-rear direction, and at least one of the pair of left and right sheet metal press materials is extended upward to form a rear side. A pair of left and right main frames, each having a wide vertical wall-shaped vertical frame portion formed in the front-rear direction, are provided at respective locations, and side frames are disposed at left and right outer sides of these main frames at intervals. Frame structure of a paddy field working machine having a front connection frame for connecting the front end of the main frame and the front end of the side frame, and a pair of left and right rear connection frames for connecting the vertical frame portion of the main frame and the rear end of the side frame. The frame structure of a paddy working machine, wherein the side frame and the rear connection frame are integrally formed by bending a round pipe material. 2. The frame structure of a paddy working machine according to claim 1, wherein a locking portion for locking and mounting an electrical component is formed by stamping on the vertical frame portion. 3. A clutch system for fixing a shaft which penetrates the left and right main frames in series to the main frame, and connecting one of the ends of the shaft protruding from the main frame to a work clutch and its operating tool. 3. The frame structure of a paddy working machine according to claim 1, wherein the frame is configured as a fulcrum shaft of the link mechanism, and the other is configured as a fulcrum shaft of a transmission link mechanism that links an operation tool thereof to the traveling transmission. 4. A vertical frame portion of one main frame is formed by extending one of the left and right 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 of a paddy working machine according to any one of claims 1 to 3, wherein the vertical frame portion is formed.