JP7085979B2 - Paddy field work machine - Google Patents

Description

The present invention relates to paddy field working machines such as passenger-type and walking-type rice transplanters, direct seeders, and chemical sprayers.

As a wheel for a paddy field working machine, for example, there is a wheel as disclosed in Patent Document 1. In the wheel of Patent Document 1, an annular rim, a disc-shaped disc portion attached to the rim, a rubber ground contact portion attached to the outer peripheral portion of the disc portion, and a boss provided in the center of the rim. It is provided with a portion and a plurality of spokes provided over the rim and the boss portion. This wheel is attached to the axle by inserting the end of the axle into the boss.

Some paddy field work machines are provided with auxiliary wheels to secure propulsion and improve running stability. In a paddy field work machine equipped with auxiliary wheels, the axle extends outward from the wheels, and the auxiliary wheels are supported by the axles protruding from the wheels.

Japanese Unexamined Patent Publication No. 2006-87436

In the conventional paddy field work machine equipped with auxiliary wheels, the auxiliary wheels are supported by the wheels, and the auxiliary wheels cannot be attached or detached. Further, even if the auxiliary wheel was removed, the auxiliary wheel could only be removed from the axle, and the axle remained protruding outward from the wheel.

Therefore, there is a demand for auxiliary wheels that can be attached and detached according to the usage conditions while eliminating waste of parts.

The paddy field working machine according to an embodiment of the present invention is supported by a drive axle to which power from a prime mover is transmitted, left and right wheels supported at both ends of the drive axle, and the drive axle of the wheels. An auxiliary wheel mounting member detachably mounted on the opposite side to the side and an auxiliary wheel detachably mounted on the auxiliary wheel mounting member are provided , and each of the wheels is an inner surface of the wheel facing the inside of the machine body. By connecting the drive axle and the hub at both ends of the drive axle, each of the wheels is supported by the drive axle, and each of the auxiliary wheel mounting members is supported by the drive axle. The auxiliary wheel is provided on the outer surface which is the back surface of the inner surface to which the hub of the wheel is provided, the auxiliary wheel shaft is irrevocably fixed, and the auxiliary wheel shaft is mounted on the auxiliary wheel mounting member. The auxiliary wheel is mounted on the wheel .

With such a configuration, the auxiliary wheel mounting member is attached to the general-purpose wheel according to the usage situation, and the auxiliary wheel is detachably attached to the auxiliary wheel mounting member without using a dedicated wheel or a drive axle. be able to.

Further, the auxiliary wheel mounting member has a mounting portion for mounting the auxiliary wheel and a flange portion mounted on the wheel, and the flange portion has a diameter centered on the axle core of the drive axle. It is preferable to provide an inclined portion that becomes smaller toward the mounting portion.

In this way, by mounting the auxiliary wheel mounting portion on the wheel at the flange portion provided with the inclined portion, the auxiliary wheel mounting portion can be easily mounted on the wheel, and foreign matter such as straw is wrapped around the axle by the flange portion. It can be suppressed.

Further , it is preferable that the mounting portion is tubular and the auxiliary wheel shaft is fitted in the mounting portion so that the auxiliary wheel is mounted on the auxiliary wheel mounting member.

By inserting the auxiliary wheel shaft into the mounting portion in this way, the auxiliary wheel can be easily mounted on the auxiliary wheel mounting member.

Further, it is preferable to provide a pin for fixing the auxiliary wheel shaft and the mounting portion.

As a result, the auxiliary wheel can be fixed to the auxiliary wheel mounting member with a simple configuration.

Further, the diameter of the auxiliary wheel is preferably smaller than the diameter of the wheel.

With such a configuration, the auxiliary wheel can obtain propulsive force over the watery area of the paddy field, and the running performance is improved.

It is an overall side view of a passenger-type rice transplanter. It is a side view which illustrates the structure of a rear wheel. It is schematic cross-sectional view which illustrates the mounting structure of a rear wheel. It is a vertical sectional front view which illustrates the structure of the auxiliary wheel attached to a rear wheel. It is a figure which illustrates the structure of the auxiliary wheel mounting part. It is a vertical sectional side view of a fertilizer application clutch.

Unless otherwise specified, the front-rear direction and the left-right direction in the embodiment of the present invention are described as follows. The traveling direction of the forward side is "forward" and the traveling direction of the reverse side is "rear" during the work running of the aircraft. The direction corresponding to the right side is "right" and the direction corresponding to the left side is "left" with respect to the forward posture in the front-back direction.

[Overall configuration of passenger-type rice transplanter]
FIG. 1 shows a passenger-type rice transplanter, which is an example of a paddy field working machine.
As shown in FIG. 1, a link mechanism 3 that can swing up and down is provided at the rear of the machine body supported by the right and left front wheels 1 and the right and left rear wheels 2, and seedlings are provided at the rear of the link mechanism 3. The planting device 5 is supported, and a hydraulic cylinder 4 for raising and lowering the link mechanism 3 is provided.

As shown in FIG. 1, the seedling planting device 5 includes a planting arm 8, a crank mechanism 7 for driving the planting arm 8, a float 9, a seedling stand 10, and the like. As a result, the planting arm 8 takes out the seedlings from the lower part of the seedling stand 10 and plants them on the rice field surface as the seedling stand 10 is driven back and forth laterally.

[Rear wheel support structure and transmission structure to the rear wheel]
As shown in FIGS. 1 and 3, a rear wheel support case 13 is rotatably supported around the center of the vertical axis at the rear portion of the airframe.

As shown in FIG. 3, the transmission shaft 15 and the axle 16 (corresponding to the drive axle) are supported inside the rear wheel support case 13. A flange portion 16a is provided at the outer end portion of the axle 16, and a rear wheel 2 (corresponding to a wheel) is connected to and supported by the flange portion 16a of the axle 16.

As shown in FIGS. 1 and 3, the power of the engine 6 (corresponding to the prime mover) is transmitted to the axle 16 via the transmission shaft 15, the bevel gear 15a of the transmission shaft 15 and the bevel gear 16b of the axle 16, and the rear wheel 2 Is driven to rotate.

[Detailed structure of rear wheels]
As shown in FIGS. It is provided with (four in this embodiment) spokes 23 and a ring-shaped ground contact portion 24 made of hard rubber.

As shown in FIG. 3, the rim 21 is configured by, for example, bending a hollow pipe member into an annular shape. The hub 22 is configured by drawing (pressing) a plate-shaped member. The spoke 23 is composed of a hollow pipe member.

One end 23a of the spoke 23 (the outer end in the radial direction of the rear wheel 2) is attached to the inner peripheral portion of the rim 21. The spokes 23 and the rim 21 are connected by welding, for example. The other end of the spoke (the inner end of the rear wheel 2 in the radial direction) is attached to the hub 22.

The hub 22 has a bowl shape having a peripheral wall portion 22a and a bottom wall portion 22b, and is arranged so that the inner side surface (concave surface) of the hub 22 faces the inside of the machine body. Of the hub 22, the notch 22d is formed by notching the peripheral wall portion 22a at a position corresponding to the spoke 23 in the circumferential direction and the outer peripheral portion of the bottom wall portion 22b continuous with the peripheral wall portion 22a.

The other end 23b (the end on the hub 22 side) of the spoke 23 is inserted from the outer surface side to the inner surface side of the hub 22 via the notch 22d. A predetermined region on the other end 23b side of the spoke is crushed to form a plate along the bottom wall portion 22b of the hub 22, and the plate-shaped portion is attached to the hub 22 by welding, for example.

The other end 23b of the spoke 23 is connected to a portion radially outer of the central portion of the hub 22. That is, the other end 23b of the spoke is located at a portion radially outer of the central portion of the bottom wall portion 22b of the hub 22.

The four spokes 23 are arranged so that the angle formed by the extension line to the center side of the adjacent spokes 23 is 85 ° to 95 °, that is, approximately 90 °. As a result, the four spokes are arranged substantially evenly. The number of spokes 23 may be 3 or less, or 5 or more.

An annular flange portion 22c is formed in a region of the bottom wall portion 22b of the hub 22 inside the other end 23b of the spoke 23, and a plurality of (three in this embodiment) holes are formed in the flange portion 22c. Has been done. The flange portion 22c is connected to the flange portion 16a of the axle 16 by a plurality of bolts 20. As a result, the rear wheel 2 is attached to the axle 16.

The rear wheel 2 has the required strength while reducing the weight by setting the strength characteristics of the rim and the spoke so as to avoid the concentration of local stress and to receive the load on the entire rim 21 and the spoke 23. Have.

[Auxiliary wheel and auxiliary wheel mounting member]
As shown in FIG. 4, the auxiliary wheel 12 is attached to the rear wheel 2 via the auxiliary wheel mounting member 30. As described above, the rear wheel 2 includes a hub 22, a plurality of spokes 23, a rim 21, and a ring-shaped ground contact portion 24 made of hard rubber. Similarly, the auxiliary wheel 12 is provided on the auxiliary wheel shaft 33, a plurality of spokes 14 radially formed from the auxiliary wheel shaft 33, a rim 18 formed in an annular shape over the ends of the spokes 14, and the rim 18. It is equipped with a lug 17. The auxiliary wheel 12 rotates integrally with the auxiliary wheel shaft 33 about the axis of the auxiliary wheel shaft 33. The diameter r of the auxiliary wheel 12 is smaller than the diameter R of the rear wheel 2. By making the diameter of the auxiliary wheel 12 smaller than that of the rear wheel 2, the lug 17 of the auxiliary wheel 12 can scratch the surface layer portion of the field to improve the propulsive force. The ground contact portion 24 of the rear wheel 2 may also have a lug shape.

As shown in FIGS. 4 and 5, the auxiliary wheel mounting member 30 includes a flange portion 31 and a mounting portion 32. The auxiliary wheel mounting member 30 is fixed to the rear wheel 2 by bolts 36 so that the flange portion 31 covers the hub 22 of the rear wheel 2. The flange portion 31 is substantially circular when viewed from the side when mounted on the rear wheel 2, and the center of the flange portion 31 substantially coincides with the axle core of the axle 16. A tubular mounting portion 32 is provided at the center of the flange portion 31. With the auxiliary wheel mounting member 30 mounted on the rear wheel 2, the cross-sectional center of the mounting portion 32 substantially coincides with the axle core of the axle 16. The flange portion 31 includes an inclined portion 31a that is separated from the rear wheel 2 toward the mounting portion 32 from the peripheral portion. By fixing the flange portion 31 so as to cover the hub 22, it is possible to prevent foreign matter such as straw from being caught in a drive shaft such as an axle 16 during work traveling.

The mounting portion 32 is tubular and includes a hollow portion having a circular or polygonal cross section. Alternatively, the mounting portion 32 is formed with a recess having a circular or polygonal cross section at an end portion opposite to the portion in contact with the flange portion 31. Hereinafter, the concave portion of the mounting portion 32 is also referred to as a hollow portion. When the auxiliary wheel 12 is mounted on the auxiliary wheel mounting member 30, the auxiliary wheel shaft 33 of the auxiliary wheel 12 is internally fitted in the hollow portion of the mounting portion 32 of the auxiliary wheel mounting member 30. Therefore, the auxiliary wheel shaft 33 of the auxiliary wheel 12 is a round shaft or a polygonal shaft, and its outer shape and dimensions are the same as the inner diameter and dimensions of the hollow portion of the mounting portion 32, or the outer diameter is the same and slightly smaller. be.

When mounting such an auxiliary wheel 12 on the rear wheel 2, the auxiliary wheel mounting member 30 is first mounted on the rear wheel 2. Then, the auxiliary wheel shaft 33 of the auxiliary wheel 12 is internally fitted into the mounting portion 32 of the auxiliary wheel mounting member 30, and the auxiliary wheel shaft 33 is fixed to the mounting portion 32. As a result, the auxiliary wheel 12 can be easily mounted on the rear wheel 2 without projecting the axle 16 of the rear wheel 2 in advance. When the auxiliary wheel 12 is not required, only the auxiliary wheel 12 can be removed, or the auxiliary wheel 12 and the auxiliary wheel mounting member 30 can be removed. Further, the auxiliary wheel mounting member 30 can be mounted on the paddy field work machine that does not support mounting the auxiliary wheel 12, and the auxiliary wheel 12 can be mounted. Further, since it is not necessary to extend the axle 16, waste of parts and materials can be suppressed. Further, regardless of the cross-sectional shape of the axle 16 of the rear wheel 2, by using the auxiliary wheel mounting member 30 corresponding to the auxiliary wheel shaft 33, the auxiliary wheel 12 having an arbitrary shape of the auxiliary wheel shaft 33 can be mounted. can. In particular, by using the auxiliary wheel 12 having a round shaft as the auxiliary wheel shaft 33, it becomes possible to use the auxiliary wheel 12 that can be easily manufactured.

When fixing the auxiliary wheel shaft 33 to the mounting portion 32, a pin or a bolt 35 can be used. For example, the auxiliary wheel shaft 33 is provided with a hole 33a, and the mounting portion 32 is provided with a hole 34. With the auxiliary wheel shaft 33 inserted into the mounting portion 32, the pin or bolt 35 is inserted so as to penetrate the hole 33a of the auxiliary wheel shaft 33 and the hole 34 of the mounting portion 32. In the case of a pin, the tip is bent or crushed so that the pin is fixed in the hole 33a and the hole 34 so as not to be inserted and removed. In the case of the bolt 35, the bolt 35 is fixed to the hole 33a and the hole 34 so as not to be inserted and removed by the nut. With such a configuration, the auxiliary wheel 12 is easily fixed to the auxiliary wheel mounting member 30.

[Fertilizer application device]
As shown in FIG. 1, the fertilizer application device 19 is provided with a hopper 25, a feeding portion 26, a blower 27, a groove making device 28, a hose 29, and the like.

A hopper 25 for storing fertilizer and a feeding portion 26 are supported on the rear side of the driver's seat 37, and a blower 27 is provided on the lateral outer side on the left side of the feeding portion 26. A grooving device 28 is connected to the float 9, four grooving devices 28 are provided, and four hoses 29 are connected to the feeding portion 26 and the grooving device 28.

The fertilizer of the hopper 25 is fed by the feeding portion 26 and supplied to the groove making device 28 through the hose 29 by the transport wind of the blower 27. Fertilizer is supplied to the ditch.

[Fertilization clutch]
The feeding portion 26 is controlled by the fertilizer application clutch 40 shown in FIG. Hereinafter, the configuration of the fertilizer application clutch 40 will be described with reference to FIG. 1 with reference to FIG. The fertilizer application clutch 40 controls the feeding of fertilizer by the feeding portion 26 by turning on and off the transmission of power from the engine 6 to the feeding portion 26. That is, when the power is transmitted from the engine 6 to the feeding section 26, the feeding section 26 is in a state of feeding fertilizer, and when the transmission of the power from the engine 6 to the feeding section 26 is cut off, the feeding section 26 is fertilized. Will not be delivered.

The fertilizer application clutch 40 includes a case 41, a shaft 42 and a shaft 49 inserted into the case 41, a clutch 43 fixed to the shaft 42, a spring 46 for urging the clutch 43, and an operating member 48 for operating the clutch 43. And a gear 44 and a gear fixed to the shaft 49 (not shown). The shaft 42 is connected to the feeding portion 26, and the power of the engine 6 is transmitted to the shaft 49. Both the gear fixed to the shaft 49 (not shown) and the gear 44 are bevel gears, and the power of the engine 6 is transmitted to the gear 44 via the shaft 49. The clutch 43 is provided side by side with the gear 44, and the spring 46 urges the clutch 43 in the direction of the gear 44. When the clutch 43 is connected to the gear 44, the power of the engine 6 is transmitted to the shaft 42 via the gear 44. The operating member 48 can move the clutch 43 urged to connect with the gear 44 to disengage the connection between the gear 44 and the clutch 43. Therefore, the operating member 48 can operate the clutch 43 between the state in which the gear 44 and the clutch 43 are connected and the state in which the clutch 43 is not connected. By this operation, the power of the engine 6 is operated in a state where it is transmitted to the shaft 42 and in a state where it is not transmitted. As a result, the feeding section 26 is controlled by the operation of the operating member 48, and the feeding section 26 feeds the fertilizer or stops the feeding of the fertilizer.

Here, the shaft 49 is inserted into the case 41 by being inserted into the bearing 47 provided in the case 41. Further, the gear 44 includes a collar 45 that protrudes outward. The gear 44 is rotatably held around the axis of the shaft 42 in such a manner that the collar 45 is sandwiched between the bearing 47 and the case 41. As described above, the clutch 43 is urged in the direction of the gear 44 by the spring 46 in a state where it is not restricted by the operating member 48. Therefore, the gear 44 is urged in the direction of the gear (not shown) connected to the shaft 49 in a state where it is not restricted by the operating member 48. Since the completed fertilizer application clutch 40 incorporates a gear (not shown), the gear 44 is positioned by the gear (not shown). However, while the fertilizer application clutch 40 is being assembled, the gear 44 is not positioned by the gear (not shown), the position of the gear 44 is not stable, and the gear 44 may fall off from the case 41. This state becomes an obstacle in the assembly process of the fertilizer application clutch 40. By providing the collar 45, the gear 44 is positioned and the fertilizer clutch 40 can be easily assembled even when the gear connected to the shaft 49 (not shown) is not incorporated.

The present invention can be applied not only to a passenger-type rice transplanter but also to a wheel for a walking-type rice transplanter and a paddy field working machine such as a direct seeding machine and a chemical sprayer, and can be applied not only to a rear wheel but also to a front wheel.

2 Rear wheel (wheel)
6 engine (motor)
12 Auxiliary wheels 16 Axles (drive axles)
30 Auxiliary wheel mounting member 31 Flange part 31a Inclined part 32 Mounting part 33 Auxiliary wheel shaft 35 Bolt r Diameter R Diameter

Claims (5)

The drive axle to which the power from the prime mover is transmitted,
The left and right wheels supported at both ends of the drive axle,
Auxiliary wheel mounting member that is detachably mounted on the side of the wheel opposite to the side supported by the drive axle, and
It is provided with an auxiliary wheel that is detachably attached to the auxiliary wheel mounting member .
Each of the wheels has a hub on the inner surface of the wheel facing the inside of the airframe, and the drive axle and the hub are connected to each other at both ends of the drive axle so that each of the wheels can be attached. Supported by the drive axle
Each of the auxiliary wheel mounting members is provided on an outer surface, which is a back surface of the wheel on which the hub is provided, with respect to the inner surface.
The auxiliary wheel is fixed so that the auxiliary wheel shaft cannot be released.
A paddy field work machine in which the auxiliary wheel is mounted on the wheel by mounting the auxiliary wheel shaft on the auxiliary wheel mounting member . The auxiliary wheel mounting member is
The mounting part for mounting the auxiliary wheel and
It has a flange portion to be mounted on the wheel and has a flange portion.
The paddy field working machine according to claim 1, wherein the flange portion includes an inclined portion whose diameter centered on the axis of the drive axle becomes smaller toward the mounting portion. The mounting portion is tubular and
The paddy field working machine according to claim 2, wherein the auxiliary wheel is mounted on the auxiliary wheel mounting member by the auxiliary wheel shaft being internally fitted in the mounting portion. The paddy field working machine according to claim 3, further comprising a pin for fixing the auxiliary wheel shaft and the mounting portion. The paddy field working machine according to any one of claims 1 to 4, wherein the diameter of the auxiliary wheel is smaller than the diameter of the wheel.

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