JPH08322362A - Production of cutter housing for mower - Google Patents

Abstract

PURPOSE: To simply produce a cutter housing enhanced in the rigidity of a hinge part at a low production cost, because the first and second housings are molded and because side walls for attaching and reinforcing the bearings for a hinge shaft can simultaneously be molded. CONSTITUTION: In a method for producing a cutter housing 10 for a mower, comprising the first housing 11 for receiving a flat blade for mowing the upper surface of a ridge and the second housing 12 shakably linked to the first housing and receiving a slope blade for mowing the slope of the ridge, the first housing and the second housing are integrally molded through a groove 19 having the approximately same width as the diameter of the bearing 15 for the hinge shaft. The bottom part 19a of the groove part is cut off to separate the first housing from the second housing. Bearings for the hinge shaft are attached to the respective side walls 19b, 19b of the groove.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a cutter housing for a mower.

[0002]

2. Description of the Related Art As a measure to reduce labor for rice cultivation, attempts have been made to replace mowing on ridges with human power, for example, Japanese Patent Laid-Open No. 6-276825, "Mowing Machine and Angle Adjusting Device and Swing Control Device". There is Japanese Utility Model Laid-Open No. 5-9228, “Mower”, which was previously proposed by the present applicant. According to FIGS. 1, 3 and 4 of that publication, a cutter base 2 (corresponding to a first housing) is attached to a frame F, and a variable cutter base 3 (corresponding to a second housing) is attached to this cutter base 2. ) Is connected by a hinge 29, the rotary blade 43 for cutting the upper surface of the ridge is stored in the cutter base 2, and the rotary blade 43a for cutting the slope of the ridge is stored in the variable cutter base 3. .

According to FIGS. 2, 3 and 5 of that publication, a fixed housing 21 (corresponding to a first housing) is attached to a support frame 7, and a swing housing 25 (second housing) is attached to the fixed housing 21. (Corresponding to) is connected by a hinge shaft 29, the main rotary blade 31 for cutting the upper surface of the ridge is housed in the fixed housing 21, and the sub rotary blade 35 for cutting the slope of the ridge is housed in the swing housing 25. It is a composition.

[0004]

The above is the one in which the variable cutter base 3 is overhanged from the cutter base 2 as shown in FIG. 4 of the publication. The same applies to the above. That is, since the variable cutter base 3 is biased toward the slope side of the ridge in the conventional two-sided mower, it is required to increase the rigidity of the hinge connection portions of the cutter bases 2 and 3. However, simply reinforcing the hinge connection portion complicates the configuration and increases the manufacturing cost. It is an object of the present invention to easily manufacture a cutter housing having an increased rigidity of a hinge connecting portion.

[0005]

Means and Action for Solving the Problems
The housing, the second housing, and the method for manufacturing the bearing for the hinge shaft, and the conditions and characteristics required for improving the rigidity of the hinge connection part are studied in detail, and the bearing for the hinge shaft is mounted at the same time as the molding of the first and second housings. In addition, he succeeded in devising a method of forming a side wall for reinforcement and reinforcement. Specifically, the first housing the flat blade for cutting the upper surface of the ridge
A method of manufacturing a cutter housing for a mower, comprising a housing and a second housing swingably hingedly connected to the first housing and accommodating a bevel blade for cutting an inclined surface of a ridge, wherein the first housing and the second housing are provided. Are integrally molded through a groove having a width substantially the same as the diameter of the bearing for the hinge shaft, and then the bottom of the groove is cut off to separate the first housing and the second housing. Install the hinge shaft bearing on the side wall.

[0006]

Embodiments of the present invention will be described below with reference to the accompanying drawings. In addition, "front", "rear", "left", "right",
"Upper" and "Lower" follow the direction as seen by the mower operator.
Further, the drawings are to be viewed in the direction of reference numerals. FIG. 1 is a plan view of a mower according to the present invention. The mower 1 is provided with a front wheel 3 at a front portion of a pipe-shaped body frame 2 and a rear wheel 4 at a rear portion thereof, and the body frame 2 has a larger diameter. The rocking pipe 5 is fitted, the engine 7 is placed on the rocking pipe 5, the cutter housing 10 is hung, and the flat blade 21 and the beveled blade 22 are separated from each other in the front and rear and right and left inside the cutter housing 10. It is a configuration of a double-sided mower, which is arranged in a row.

The cutter housing 10 is a body frame 2
A first housing 11 as a fixed-side housing and a second housing 12 as a swing-side housing attached to the
The first housing 11 houses the flat blade 21, and the second housing 12 houses the beveled blade 22. Reference numeral 14 is a swing axis line passing through the hinge 13. That is, the mower 1 offsets the flat blade 21 and the beveled blade 22 to one side (left side in this embodiment) from the running direction axis of the body frame 2 passing through the wheel width center of the rear wheel 4,
The front wheels 3 are also offset in the same direction, and the engine 7 is offset on the other side (right side in this embodiment). The plane blade 21 is slightly offset from the running direction axis.

In this case, the front wheel 3 is a guide wheel which is a guide for steering when the mowing machine 1 is traveling, and is made of narrow tires, and the rear wheel 4 is a traveling wheel for allowing the mowing machine 1 to travel by itself. It consists of wide tires. Further, the lawn mower 1 is set so that the rear wheel 4 side is heavier than the front wheel 3 side. For example, the weight distribution of the lawn mower 1 is such that the ratio of the weight received by the front wheel 3 to the weight received by the rear wheel 4 is about 1: 4. Is set to.

The front wheel 3 is attached to a front wheel arm 23 extending from the front portion of the vehicle body frame 2. An auxiliary wheel arm 24 extends from the left front part of the second housing 12, and an auxiliary wheel 25 for defining the height of the second housing 12 is attached to the front part of the auxiliary wheel arm 24.

The output shaft 7a of the engine 7 faces downward,
The flat blade 21 and the beveled blade 22 are rotated via the belt transmission mechanism 30. The belt transmission mechanism 30 is composed of a first belt 31, a second belt 32 and pulleys stretched vertically in two stages. The first belt 31 drives the flat blade 21 and the second belt 32 drives the inclined blade 22. It is a thing. That is, the first belt 31 includes the first pulley 33 attached to the output shaft 7a of the engine 7 and the flat blade shaft 21a.
It is wound around a second pulley 34 for driving the.

Reference numeral 42 is a rocking lever locked to the first housing 11. A tensioner roll 43 is formed at one end of the rocking lever 42, and a brake shoe 44 is formed at the other end.
The operator uses an operation lever and a wire (not shown) to swing the swing lever 4
When 2 is swung counterclockwise in the figure, the first belt 31 is tensioned, the power of the first pulley 33 is transmitted to the second pulley 34, and the plane blade shaft 21a is driven. On the contrary, when the swing lever 42 is swung clockwise, the first belt 31 is slackened and the power transmission is weakened, so that the brake shoe 42 can brake the first belt 31. According to the above procedure, the flat blade 21 can be arbitrarily operated / stopped while the engine is operating and running.

The second belt 32 includes an idler pulley 35 (hereinafter referred to as "third pulley 35") integrally formed below the second pulley 34, a fourth pulley 36 for driving the beveled blade shaft 22a, and a wobble. Three idler pulleys 37 to 39 (hereinafter, referred to as “fifth, sixth, and seventh pulleys 37 to 39”) arranged substantially in one row in the front and rear in the vicinity of the moving axis 14;
The idler pulley 4 integrally formed below the pulley 37
1 (hereinafter referred to as "eighth pulley 41"). In terms of arrangement, the rear fifth pulley 37 (eighth pulley 4
(Including 1) is pivotally supported on the first housing 11, and the inclined sixth pulley 38 on the front side and the seventh pulley 39 at the center are pivotally supported on the second housing 12. Therefore, the second belt 32
Is the third pulley 35, the fifth pulley 37, the sixth pulley 38,
It is wound by a loop of the fourth pulley 36, the seventh pulley 39, the eighth pulley 41, and the third pulley 35.

FIG. 2 is a side view (main part) of a mower according to the present invention, in which a rocking tube 5 is attached to a vehicle body frame 2.
An engine 7 is mounted on the rocking tube 5 via a mount plate 6.
Is mounted, while the first housing 11 is suspended from the swing tube 5 via the hanger brackets 8 and 8. The engine 7 uses the above-mentioned two cutting blades (flat blade 2
1 and the beveled blade 22), a continuously variable transmission 27 is driven via a universal shaft 26, and the rear wheels 4 are driven by the continuously variable transmission 27 via a chain 28.

The front wheel arm 23 is attached to the body frame 2 side by a pin 51, and the attachment angle can be changed by replacing the insertion pin 52. 53 ... (... indicates a plurality, the same applies hereinafter) is a pin hole, and 54 is a plate. Similarly, the auxiliary wheel arm 24 is attached to the second housing 12 side by a pin 55, and the attachment angle can be changed by replacing the insertion pin 56. 57 is a plate. Further, the handle 61 is swingably attached to the rear portion of the vehicle body frame 2 with a pin 62, and the insertion pin 6
It is a mechanism that can change the mounting angle by replacing 3. 64 ... Pin holes, and 65 are supports.

The oscillating tube 5 may be omitted and the first housing 11 may be directly attached to the vehicle body frame 2 via a bracket. However, in the present embodiment, the first housing 11 is also oscillated to some extent. . Also, the cutter housing 10
Is not limited to the hanging structure, and may be mounted, for example.

FIG. 3 is a view (front view) showing a swinging posture of the mower according to the present invention. The hinge 1 is attached to the first housing 11.
It is shown that the second housing 12 is swingably connected via 3. Reference numeral 67 is a pipe-shaped front wheel guard member that straddles the front wheel 3.

FIG. 4 is an exploded perspective view of the cutter housing according to the present invention, in which the left side of the drawing is the front side of the mower and the right side thereof is the rear side. The first housing 11 made of a thin steel plate has a side wall 11b integrally formed around the entire top plate 11a, and has a mounting portion 11c for mounting the flat blade shaft 21a shown in FIG. 1 at approximately the center of the top plate 11a. , Mounting part 1
A reinforcing undulating portion 11d for enhancing the rigidity of the top plate 11a is formed around 1c. Similarly, in the second housing 12 made of a thin steel plate, the side wall 12b is integrally formed on the entire circumference of the top plate 12a, and the attachment portion 12c for attaching the bevel blade shaft 22a shown in FIG. A reinforcing undulating portion 12d for increasing the rigidity of the top plate 12a is formed around the mounting portion 12c.

First housing 11 and second housing 12
Side walls (corresponding to the side walls 19b, 19b of the groove portion 19 described with reference to FIG. 5) facing each other are swingably connected by a hinge 13. That is, the hinge 13 has hinge shaft bearings 15 ... Attached to the side walls 19b, 19b by welding, a hinge shaft 16 inserted into the hinge shaft bearings 15 ..., and washers inserted into both ends of the hinge shaft 16. 17 and 17 and pins 18 and 18. Incidentally, 68 is the first housing 1
1 is a bracket attached to the front end of the No. 1 for fixing the front wheel guide member 67 shown in FIG.

Next, a method of manufacturing the cutter housing 10 having the above structure will be described with reference to FIG. 5A to 5D are explanatory views of the procedure for manufacturing the cutter housing according to the present invention, and show a cross section viewed from the front side of the mower. First, (a)
As shown in, the first housing 11 and the second housing 1
2 and 1 are integrally formed through a groove portion 19 that is open on the upper side and extends in the front-rear direction (front and back direction in this figure). The groove width of the groove portion 19 is preferably substantially the same as the diameter of the hinge shaft bearing 15. Since the bottom portion 19a of the groove portion 19 is cut in the next step,
If the groove width is too wide, the material is wasted, and if it is too narrow, it is not easy to cut.

Next, as shown in (b), the bottom portion 19a of the groove portion 19 is cut off near the roots of the side walls 19b and 19b (for example, at the positions indicated by alternate long and short dash lines A and A) to separate the first housing 11 from the first housing 11. 2 separated into the housing 12. The excision work can be completed in a short time by press work and the finished state is good, but the present invention is not limited to this. afterwards,
As shown in (c), the hinge shaft bearings 15 ... Are welded to the side walls 19b, 19b. The left and right hinge shaft bearings 15 ... Are aligned with each other. Finally, as shown in (d), the hinge shafts 16 are inserted through all the hinge shaft bearings 15 ...
The second housing 12 and the second housing 12 are hinged to complete the manufacturing operation of the cutter housing 10.

In the cutter housing 10 manufactured as described above, the side walls 19b and 19b are integrally formed at the same time when the first and second housings 11 and 12 are formed. The side walls 19b and 19b serve to mount the hinge shaft bearings 15 ... And to reinforce the edge portions (hinge connecting portions) of the first and second housings 11 and 12. For this reason, the hinge connection portions of the first and second housings 11 and 12 have increased rigidity without providing a special reinforcing member, and the manufacturing cost can be reduced. Further, as compared with the conventional case where the first housing 11 and the second housing 12 are separately molded, since the molding is performed with a single molding die, there is no need to replace the molding die and the molding process is also performed. Fewer, less expensive, more productive and less expensive to manufacture.

The operation of the above-mentioned mower is shown in FIGS.
It will be explained based on. The mowing machine 1 in the posture shown in FIG. 2 has a non-oscillating posture in which the beveled blade 22 is parallel (flush) with the plane blade 21, and is suitable for traveling on farm roads and mowing on a wide flat surface. At this time, the auxiliary wheel 25 can be floated from the ground by lifting the second housing 12 using a chain or the like (not shown). In the mowing machine 1 in the posture shown in FIG. 3, the plane blade 21 is parallel to the upper surface 71 of the ridge 70, and the second housing 12 and the bevel blade 22 are inclined along the slope 72. 70 ridges with blade 21
The grass on the upper surface 71 is cut, and the grass on the slope 72 is cut by the slope blade 22.

[0023]

As described above, according to the present invention, the first housing and the second housing are integrally molded through the groove having a width substantially the same as the diameter of the bearing for the hinge shaft, and then the bottom of the groove is formed. The first housing and the second housing are separated by cutting, and the hinge shaft bearings are attached to the side walls of the groove, so that the hinge shaft bearings are mounted at the same time when the first and second housings are molded. In addition, since the side wall for reinforcement can be formed, the cutter housing with the increased rigidity of the hinge connection portion can be easily manufactured, and the manufacturing cost can be reduced. In addition, the first housing and the second
Compared to the case where the housing and the housing are molded separately, there is no need to replace the molding mold because it is molded with a single molding mold.
The number of molding steps is small, productivity is improved and manufacturing cost is low.

[Brief description of drawings]

FIG. 1 is a plan view of a mower according to the present invention.

FIG. 2 is a side view (main part) of the mower according to the present invention.

FIG. 3 is a view showing a swinging posture of the mower according to the present invention (front view).

FIG. 4 is an exploded perspective view of a cutter housing according to the present invention.

FIG. 5 is an explanatory view of a manufacturing procedure of the cutter housing according to the present invention.

[Explanation of symbols]

1 ... Mower, 2 ... Body frame, 3 ... Front wheel, 4 ... Rear wheel,
7 ... Engine, 10 ... Cutter housing, 11 ... First housing, 12 ... Second housing, 13 ... Hinge, 14
... rocking axis, 15 ... bearing for hinge shaft, 16 ... hinge shaft,
Reference numeral 19 ... Groove portion, 19a ... Bottom portion, 19b ... Side portion, 21 ... Flat blade, 22 ... Beveled blade.

Claims (1)

[Claims] 1. A grass mowing comprising a first housing containing a flat blade for cutting the upper surface of a ridge and a second housing containing a bevel blade for hingedly swingingly coupled to the first housing for cutting the slope of the ridge. In the method for manufacturing a cutter housing for machine, the first housing and the second housing are integrally molded through a groove having a width substantially the same as the diameter of the hinge shaft bearing, and then the bottom of the groove is cut off. A method of manufacturing a cutter housing for a mower, characterized in that a first housing and a second housing are separated, and then a hinge shaft bearing is attached to each side wall of the groove.