Paddy field work vehicle

Abstract

To provide a paddy field work vehicle with sufficient safety measures even with respect to an inclined posture of a vehicle body in a right and left direction.SOLUTION: A paddy field work vehicle includes: a travel vehicle body; a wheel provided in the travel vehicle body and including an annular body part and a lug 4 provided in an outer peripheral region of the body part; and a rolling prevention body 5 arranged in the outer peripheral region of the body part. The rolling prevention body 5 is formed with a prevention part that contacts the ground at a predetermined inclination angle of an inclination motion at the time of the inclination motion of the travel vehicle body in the right and left direction with the contact point of the lug 4 as a rotation axis.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a paddy field working vehicle equipped with wheels, such as a riding or walking type rice transplanter, a direct seeding machine, or a pesticide sprayer. [Background technology]

[0002] The wheels of this type of paddy field working vehicle are composed of a hub connected to the axle, an annular rim connected to the hub by spokes, and lugs protruding from both the left and right sides of the annular rim (see, for example, Patent Document 1). The wheels thus constructed are rotated by the driving force transmitted from the engine via a transmission (see, for example, Patent Document 2). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2022-098851 [Patent Document 2] JP 2018-117538 A Summary of the Invention [Problem to be solved by the invention]

[0004] Paddy field work vehicles are sometimes transported by truck from a barn or the like to a field, and when loading and unloading, the vehicle body is tilted in the longitudinal direction. In addition, since paddy field work vehicles work in fields partitioned by ridges having inclined surfaces, the paddy field work vehicles are tilted in the longitudinal direction and the lateral direction of the vehicle body when entering and leaving the field. Furthermore, when foreign objects such as stones or wood are present in the field during field work, the paddy field work vehicle that runs over the foreign object will be tilted in the lateral direction. Since the vehicle body is tilted in the longitudinal direction during loading and unloading and when traveling uphill, safety measures against the vehicle body tilting in the longitudinal direction have been taken for some time. However, safety measures against the vehicle body tilting in the lateral direction have been insufficient.

[0005] In view of the above circumstances, an object of the present invention is to provide a paddy field working vehicle in which sufficient safety measures are taken even when the vehicle body is tilted in the lateral direction. [Means for solving the problem]

[0006] The paddy field working vehicle according to the present invention comprises a running body, wheels attached to the running body and having a circular main body and lugs attached to the outer peripheral region of the main body, and a rollover prevention body arranged on the outer peripheral region of the main body, the rollover prevention body being formed with a prevention portion that comes into contact with the ground at a predetermined tilt angle of the running body when the running body tilts left and right with the ground contact point of the lug as the axis of rotation.

[0007] According to this configuration, when the traveling body of the paddy field work vehicle tilts left and right and the tilt angle reaches a predetermined tilt angle, the prevention part of the rollover prevention body touches the ground, generating a resistance force (braking force) against further tilt. This prevents tilting beyond the predetermined tilt angle. By setting the predetermined tilt angle to be smaller than the base angle specified for preventing rollover of the paddy field work vehicle, preferably to about 1 / 2 of the predetermined rollover angle, the safety of the paddy field work vehicle against rollover is improved.

[0008] In the present invention, in order to more effectively obtain the anti-tilt force against tilting by the anti-rollover body, the prevention portion is formed in a flat shape.

[0009] The rollover prevention body can be attached to the wheel in an appropriate manner depending on the structure of the wheel, particularly the structure of the rim and lug. In a first embodiment, the rollover prevention body is molded integrally with the lug. In this way, the rollover prevention body is attached to the rim by attaching the lug to the rim. Furthermore, the alignment of the lug and the rollover prevention body is completed during molding, which simplifies the installation process of the rollover prevention body.

[0010] In a second embodiment, the rollover prevention body is a molded body separate from the lug, and is fixed by the side of the lug. For example, the rollover prevention body is detachably fixed to the wheel by a connecting member that is connected to the left and right direction of the wheel. The rollover prevention body is composed of a molded body separate from the lug, and is fixed to the side of the lug by a connecting member such as a bolt, making it detachable. More specifically, in a third embodiment, the rollover prevention body is a molded body separate from the lug, and is fixed to the rim that fixes the lug, or to both the lug and the rim.

[0011] When the rollover prevention body is molded separately from the lug, the shape of the rollover prevention body and the position of the prevention part can be determined with a large degree of freedom, avoiding the restrictions imposed by integral molding with the lug. When the rollover prevention body is a molded body separate from the lug, that is, when the rollover prevention body molded separately from the lug is connected to the lug, the distance between the rollover prevention body and the lug is short, so it is easy to use simple connectors such as bolts and screws as a connecting means. When the rollover prevention body molded separately is connected to the rim, the rigidity of the rim is generally higher than that of the lug, so the rollover prevention body can be more stably assembled to the wheel.

[0012] In a fourth embodiment relating to the attachment of the rollover prevention body to the wheel, the rollover prevention body is provided on an auxiliary wheel body part that is separate from the main body part. As a specific example, the rollover prevention body is fixed to a dedicated rim that is connected to the wheel hub via dedicated spokes. In this embodiment, the rollover prevention body is configured as a so-called auxiliary wheel, so that not only is there a high degree of freedom in designing the rollover prevention body, but it is also easy to attach and detach, so that it can be used selectively as needed.

[0013] The left-right tilt of the traveling vehicle body occurs with the ground contact portion of one of the wheels as the rotation axis (tilt axis), so the rollover prevention body only needs to be placed on the outside of the lug of the wheel that serves as the rotation axis. For this reason, in a preferred embodiment of the present invention, the rollover prevention body is provided on the side surface that faces outward of the main body when the wheel is attached to the traveling vehicle body. Of course, the rollover prevention body may be provided on both sides of the lug of the wheel, taking into consideration the rotation balance of the wheels, etc.

[0014] In one embodiment of the present invention, the rollover prevention body includes a first prevention part and a second prevention part that come into contact with the ground at different predetermined inclination angles, and the ground inclination angle of the second prevention part is set to be larger than the ground inclination angle of the first prevention part. In this configuration, the rollover prevention body can use the first prevention part and the second prevention part to gradually limit the left-right tilting movement of the traveling vehicle body. If the first prevention part is a preliminary vehicle body inclination limiting means, the second prevention part can function as a final vehicle body inclination limiting means. For example, when the first prevention part is in contact with the ground, the vehicle body can travel, and when the second prevention part is in contact with the ground, the vehicle body can travel with difficulty. Of course, third, fourth, etc., prevention parts may be provided.

[0015] In order for the second blocking portion to function as a greater tilt limiting means than the first blocking portion, it is preferable that the ground contact area of ​​the second blocking portion is formed larger than the ground contact area of ​​the first blocking portion.

[0016] In yet another embodiment of the present invention, the preventing portion of the rollover prevention body has a protruding tip that pierces the ground in a posture exceeding the predetermined tilt angle. In this configuration, when the traveling vehicle body is tilted beyond the predetermined tilt angle, the protruding tip of the preventing portion pierces the ground, thereby increasing the vehicle body rollover prevention force by the rollover prevention body. [Brief description of the drawings]

[0017] [Figure 1] FIG. 2 is an overall side view of a riding rice transplanter. [Diagram 2] FIG. [Diagram 3] FIG. 4 is a longitudinal sectional front view of the rear axle case, the rear wheel support case, and the rear wheel. [Figure 4] FIG. 4 is a schematic diagram showing the attitude of the lug and the rollover prevention body when tilting left or right. [Diagram 5] FIG. 4 is a schematic diagram showing a first embodiment of an attachment configuration for an anti-rollover body. [Figure 6] FIG. 11 is a schematic diagram showing a second embodiment of the mounting configuration of the rollover prevention body. [Figure 7] FIG. 13 is a schematic diagram showing a third embodiment of the mounting configuration of the rollover prevention body. [Figure 8] FIG. 13 is a schematic diagram showing a fourth embodiment of the mounting configuration of the rollover prevention body. [Figure 9] FIG. 11 is a schematic diagram showing another embodiment of a rollover prevention body.

[0018] In this specification, unless otherwise specified, "front" means forward in the longitudinal direction (travel direction) of the aircraft, and "rear" means rearward in the longitudinal direction (travel direction) of the aircraft. Furthermore, left-right or lateral direction means the transverse direction (width direction) of the aircraft that is perpendicular to the longitudinal direction of the aircraft. "Up" and "down" refer to the positional relationship in the vertical direction (perpendicular direction) of the aircraft, and indicate the relationship in terms of height above the ground.

[0019] A riding rice transplanter, which is an example of a paddy field working vehicle, is shown in Figure 1. As shown in Figure 1, a link mechanism 11 that can swing up and down is provided at the rear of a traveling body 10 that is supported on the ground by wheels consisting of a pair of left and right front wheels 1 and a pair of left and right rear wheels 2, and a seedling planting device 12, which is an example of a seedling working device, is supported at the rear of the link mechanism 11. The link mechanism 11 is raised and lowered by a hydraulic cylinder, which also raises and lowers the seedling planting device 12.

[0020] As shown in Fig. 1, the seedling planting device 12 is equipped with a planting arm, a float, a seedling tray, etc. During the operation, as the seedling tray is driven to move back and forth sideways, the planting arm takes out seedlings from the bottom of the seedling tray and plants them on the surface of the rice field.

[0021] As shown in Figures 1 and 2, a rear wheel support case 13 is supported at the rear of a traveling vehicle body 10 so as to be steerable about a vertical axis. As shown in Figure 2, a transmission shaft 15 and an axle 16 are supported inside the rear wheel support case 13. A flange portion 16a is provided at the outer end of the axle 16, and a rear wheel 2 (one of the wheels) is connected to and supported by the flange portion 16a of the axle 16.

[0022] Power from an engine (not shown) as an example of a drive source is transmitted to the axle 16 via a hydrostatic continuously variable transmission (not shown), a gear transmission (not shown), a propeller shaft (not shown), etc., through a transmission shaft 15, a bevel gear 15a of the transmission shaft 15, and a bevel gear 16b of the axle 16, thereby driving and rotating the rear wheel 2 (see FIG. 2). Note that, in addition to an engine (internal combustion engine), an electric motor, a hybrid engine combining an electric motor and an engine, etc. may be used as the drive source.

[0023] 2 and 3, the rear wheel 2 includes an annular main body 20, lugs 4 that function as ground contact parts, and a rollover prevention body 5. The main body 20 includes an annular rim 21, a hub 22 that is located in the central region of the ring formed by the rim 21, and a plurality of spokes 23 (four in this embodiment) that are provided between the rim 21 and the hub 22.

[0024] 3, the rim 21 is formed, for example, by bending a hollow pipe member into an annular shape. In this embodiment, the hub 22 is produced by drawing (pressing) a plate-shaped member, and the spokes 23 are made of hollow pipe members.

[0025] The tips of the spokes 23 (the outer ends in the radial direction of the rear wheel 2) are attached to the inner periphery of the rim 21. The spokes 23 and the rim 21 are connected by, for example, welding. The other ends of the spokes 23 (the inner ends in the radial direction of the rear wheel 2) are attached to the hub 22.

[0026] An annular flange portion 22a is formed in the central region of the hub 22, and a plurality of holes (three in this embodiment) are formed in the flange portion 22a. The flange portion 22a is connected to the flange portion 16a of the axle 16 by a plurality of bolts. In this way, the rear wheel 2 is attached to the axle 16. The inner surface (concave surface) of the hub 22 faces the inside of the aircraft body.

[0027] The lugs 4 are attached to the outer periphery of the main body 20. As shown in Fig. 4 to Fig. 8, the lugs 4 have attachment parts 41 attached to the tips of the spokes 23 and an outer periphery 42 that surrounds the rim 21. The lugs 4 are molded from hard rubber. However, the material and manufacturing method of the lugs 4 are not limited to molding and hard rubber, and the lugs 4 may be manufactured by machining or the like using metal as the material.

[0028] Furthermore, a rollover prevention body 5 is disposed in the outer peripheral region of the main body 20. As shown in an enlarged view in FIG. 4, the rollover prevention body 5 is formed with a blocking portion 51 that contacts the ground at a predetermined inclination angle θ of the tilting movement (indicated by the symbol RM and an arrow in FIG. 4) during the left-right tilting movement of the rice transplanter (traveling body 10) with the ground contact point of the lug 4 as the rotation axis. One example of the form of the rollover prevention body 5 is a substantially rectangular parallelepiped with one side being a slope. This planar slope functions as the blocking portion 51, and contacts (contacts) the ground (field scene 100) at the inclination of the traveling body 10 at the predetermined inclination angle θ, creating a resistance force (braking force) against further inclination. The predetermined inclination angle θ is of course set smaller than the prescribed angle specified by the regulations to prevent the paddy field working vehicle from rolling over, but is set to about 1 / 4 to 3 / 4 of the prescribed angle in consideration of safety.

[0029] The rollover prevention body 5 can be attached to the wheel in various ways, as shown below. 5, in the first embodiment, the rollover prevention body 5 is integrally formed with the lug 4, and in this case, the rollover prevention body 5 has a prevention portion 51 that faces downward and protrudes in the axle direction from one side surface of the circumferential portion of the lug 4. The rollover prevention body 5 may be formed at a predetermined pitch, or may be a continuously formed annular shape.

[0030] In the second form, as shown in FIG. 6, the rollover prevention body 5 is fixed to one side of the circumferential portion of the lug 4 by using a connector 6. The connector 6 is composed of, for example, a connecting bolt 61 that passes laterally through the lug 4, a spacer 62, and a nut 63. The spacer 62 has the function of adjusting the distance between the lug 4 and the rollover prevention body 5 (the function of adjusting the bracing force). The rollover prevention body 5 is a molded body separate from the lug 4, that is, a body separate from the lug 4, and therefore may be made of metal or may be made of the same material as the lug 4. The rollover prevention body 5 may be made of a plurality of small pieces and arranged at a predetermined pitch, or may be made as a ring.

[0031] In the third embodiment, as shown in FIG. 7, the rollover prevention body 5 is fixed to the outer end region of the spoke 23 by a connector 6 and a bracket 65 as a connecting member. The bracket 65 fixed to the spoke 23 by the connector 6 has an outer circumferential groove 66 formed therein, into which the upper part of the rollover prevention body 5 is inserted. In this embodiment, the rollover prevention body 5 may be a small piece arranged at a predetermined pitch, or may be arranged as a ring. Similarly, the bracket 65 may be arranged at a predetermined pitch, or may be arranged as a ring. In FIG. 7, the lug 4 is interposed between the bracket 65 and the spoke 23, but the bracket 65 may be directly fixed to the spoke 23. In that case, the bracket 65 can be fixed to the spoke 23 by welding. In addition, by configuring the connector 6 with a bolt or the like, the rollover prevention body 5 becomes detachable from the wheel, and the use of the rollover prevention body 5 can be selected as necessary.

[0032] In the fourth embodiment, as shown in Fig. 8, the rollover prevention body 5 is provided on an auxiliary wheel body 7 that is separate from the main body 20 of the wheel. The auxiliary wheel body 7 is composed of an auxiliary hub 71, auxiliary spokes 72, and an auxiliary rim 73, and the rollover prevention body 5 is fixed to the auxiliary rim 73. The auxiliary hub 71 can be bolted together with the hub 22 to the flange portion 16a of the axle 16. That is, in this embodiment, the auxiliary wheel body 7 including the rollover prevention body 5 is configured as an auxiliary wheel for a regular wheel.

[0033] In the fifth embodiment, although not shown, the prevention portion 51 of the rollover prevention body 5 has a first prevention portion and a second prevention portion that come into contact with the ground at different vehicle body left and right inclination angles. The ground inclination angle of the second prevention portion is set to be larger than that of the first prevention portion. Of course, the prevention portion 51 may have not only the first prevention portion and the second prevention portion, but also three or more portions. In such a configuration, the rollover prevention body can use the first prevention portion and the second prevention portion to gradually limit the left and right tilting movement of the traveling vehicle body 10. If the first prevention portion is the vehicle body inclination limiting means that functions the least, the second prevention portion can be the vehicle body inclination limiting means that functions last. Therefore, the second prevention portion, which is the last vehicle body inclination limiting means, is formed to have a ground contact area larger than that of the first prevention portion and is formed to generate a greater bracing force than the first prevention portion.

[0034] FIG. 9 shows another embodiment of the rollover prevention body 5 different from the above-mentioned embodiment. In this embodiment, the rollover prevention body 5 is also arranged in the outer circumferential region of the wheel, but unlike the first to fifth embodiments in which the prevention part 51 of the rollover prevention body 5 obtains the bracing force at the contact surface with the ground, the prevention part 51 obtains the bracing force by piercing (sticking) the protruding tip 52 into the ground. As is clear from FIG. 9, in this other embodiment, the prevention part 51 of the rollover prevention body 5 has a protruding tip 52 that pierces the ground in an inclined posture exceeding a predetermined inclination angle: θ. The shape of the rollover prevention body 5 as a whole and the method of fixing it to the wheel or the traveling vehicle body 10 can be applied to those described in the first to fifth embodiments. Furthermore, the structure of the rollover prevention body 5 in this other embodiment may be a structure consisting of a rod-shaped body and a support body that supports the rod-shaped body. The protruding tip 52 may be arranged at a predetermined interval along the outer circumferential surface of the wheel, or may be arranged continuously.

[0035] [Another embodiment] (1) In the above embodiment, the rear wheel 2 of a riding rice transplanter is taken as the wheel of the paddy field working vehicle of the present invention, but a similar structure may be applied to the front wheel 1. In addition, the paddy field working vehicle is not limited to a riding rice transplanter, and may be a walk-behind rice transplanter, a direct seeding machine equipped with a seeding device, a chemical sprayer, or the like.

[0036] (2) In the above embodiment, the rollover prevention body 5 is a substantially rectangular parallelepiped with one surface being a slope, but the overall shape is not limited. Furthermore, the prevention portion 51 may also be a surface other than a flat surface, for example, a protruding surface with multiple protrusions formed thereon. The shape of the prevention portion 51 is not limited as long as it has a function of touching the ground at a predetermined inclination angle of the tilting motion of the paddy field working vehicle in the left-right direction with the ground contact point of the lug 4 as the rotation axis. For example, the rollover prevention body 5 may be formed in a wedge shape in which the lower portion of the rollover prevention body 5 is narrower in the left-right direction of the wheel than the upper portion of the rollover prevention body 5. In particular, a wedge shape in which the lower portion of the rollover prevention body 5 pierces the ground in a posture exceeding the predetermined inclination angle is preferable. As a result, when the traveling vehicle body 10 is tilted beyond the predetermined inclination angle, the tip (lower end) of the rollover prevention body 5 pierces the ground, improving the vehicle body rollover prevention force of the rollover prevention body 5.

[0037] In addition, the configurations disclosed in the above embodiments (including other embodiments, the same applies below) can be applied in combination with configurations disclosed in other embodiments, provided no contradiction arises. Furthermore, the embodiments disclosed in this specification are illustrative, and the embodiments of the present invention are not limited thereto, and can be appropriately modified within the scope that does not deviate from the purpose of the present invention. [Industrial Applicability]

[0038] The present invention is applied to wheels of a paddy field working vehicle. [Explanation of symbols]

[0039] 1: Front wheel 2: Rear wheel 3: Main body 4: Rug 5: Rollover prevention body 6: Connector (connecting member) 7: Auxiliary wheel section 10: Running vehicle 11: Link mechanism 12: Seedling planting device 13: Rear wheel support case 15: Transmission shaft 15a: Bevel gear 16: Axle 16a: Flange part 16b: Bevel gear 21: Rim 22: Hub 22a: Flange part 23: Spokes 51: Blocking part 52: Entry tip 61: Connecting bolt (connecting member) 62: Spacer 63: Nut 65: Bracket (connecting member) 66: Outer circumferential groove 71: Auxiliary hub 72: Auxiliary spoke 73: Auxiliary rim 100: Field scene

Claims

1. A running vehicle body, A wheel provided on the traveling vehicle body, the wheel having an annular main body and a lug provided on an outer circumferential region of the main body; a rollover prevention body disposed on the outer circumferential region of the main body, In the paddy field working vehicle, the rollover prevention body is formed with a prevention portion that comes into contact with the ground at a predetermined tilt angle when the running body tilts left and right with the ground contact point of the lug as the axis of rotation.

2. The paddy field working vehicle according to claim 1 , wherein the blocking portion is formed in a flat shape.

3. 2. The paddy field working vehicle according to claim 1, wherein the anti-rollover body is integrally formed with the lug.

4. 2. The paddy field working vehicle according to claim 1, wherein the anti-rollover body is a separate body from the lug and is fixed to a side surface of the lug.

5. 2. The paddy field working vehicle according to claim 1, wherein the rollover prevention body is detachably fixed to the wheel by a connecting member which is connected to the wheel in the left-right direction of the wheel.

6. 2. The paddy field working vehicle according to claim 1, wherein the anti-rollover body is a molded body separate from the lug and is fixed to a rim which fixes the lug or to both the lug and the rim.

7. 2. The paddy field working vehicle according to claim 1, wherein the rollover prevention body is provided on an outward facing side of the main body when the wheels are attached to the traveling vehicle body.

8. 2. The paddy field working vehicle according to claim 1, wherein the anti-rollover body is provided on an auxiliary wheel body portion separate from the main body portion.

9. A paddy field work vehicle as described in any one of claims 1 to 8, wherein the prevention portion of the rollover prevention body has a first prevention portion and a second prevention portion that come into contact with the ground at different predetermined inclination angles, and the ground contact inclination angle of the second prevention portion is greater than the ground contact inclination angle of the first prevention portion.

10. The paddy field working vehicle according to claim 9, wherein a ground contact area of ​​the second blocking portion is larger than a ground contact area of ​​the first blocking portion.

11. 2. The paddy field working vehicle according to claim 1, wherein the prevention portion of the rollover prevention body has a protruding tip that pierces the ground when in a position exceeding the predetermined inclination angle.

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