JP4847068B2 - Agricultural wheel tire - Google Patents

Description

  The present invention relates to a tire for agricultural wheels used for walking type management machines and the like.

A vertical lug that consists of a main body whose surface constitutes the tread surface of the tire and a lug that protrudes from the tread surface, and the lug projects toward the outer periphery at equal intervals in the rotational direction at the center of the tire tread surface And the tire of the agricultural wheel which consists of a horizontal lug which protrudes toward the direction orthogonal to a rotation direction from a vertical lug in planar development view is known (for example, refer patent document 1).
No. 7-30401

  The lug of the tire is substantially T-shaped in a plan view, and the lateral lug protrudes from the vertical lug in one direction orthogonal to the rotational direction in the plan view. For this reason, there is a demand for a tire that has little improvement in traction force due to the lateral lugs, can obtain a larger traction force, and gives a soft image.

The agricultural wheel tire of the present invention for solving the above problems comprises a main body 30 whose surface constitutes a tread surface of the tire 27 and a lug 32 formed to protrude from the tread surface. Agricultural products comprising vertical lugs 32a projecting toward the outer peripheral direction at equal intervals in the rotational direction and lateral lugs 32b projecting from the vertical lugs 32a in a direction perpendicular to the rotational direction in a plan view in the center of the tread surface. In the tire of the wheel, the circumferential surfaces of the vertical lugs 32a and the horizontal lugs 32b are tapered so as to be thick at the boundary portions with each other and the tread surface, and the horizontal lugs 32b are formed from the vertical lugs 32a. The two horizontal lugs 32bL are made to protrude in two directions perpendicular to the rotational direction in a plan view, and one long side lug 32bL is formed longer than the other horizontal lug 32bS. Is projected from the side wall of the Ya 27, lateral lugs 32bS short side, housed in a tread surface of the tire 27 in a plan view, and formed into a shape widthwise side toward the body 30 to the outer periphery itself is widened, the main body The lateral lug 32bL is extended so that the long lateral lug 32bL projecting outward from 30 extends to the lower end edge side of the side fall while tilting at an angle extending the inclined surface on the inner peripheral side of the side fall. The first feature is that the lugs 32 are formed so that the protruding directions of the long side lugs 32bL are alternately arranged in order.

  Second, the short side lug 32bS is configured such that the top of the outer peripheral tip is located inside the side edge of the tread surface and the lower end is located at the side edge of the tread surface. Yes.

  According to the structure of the present invention configured as described above, the tire of the agricultural wheel has a lateral lug that protrudes not only in one direction perpendicular to the vertical lug but also in two directions. The overall length of the lateral lugs is increased, a high traction force can be secured, and the aircraft can be run without slipping even in a relatively soft field.

  At this time, since the horizontal lag has a short side lag on the opposite side of the long side lag across the vertical lag, mud clogging at the intersection of the vertical rug and the horizontal rug is reduced, and the tire Mud clogging is prevented. When the aircraft is traveling, the long side lugs are alternately grounded toward the inside and outside of the aircraft, so that the tires are grounded smoothly and vibration during traveling is reduced.

  In addition, by configuring the short side lug so that the top of the outer peripheral tip is located inside the side edge of the tread surface and the lower end is located at the side edge of the tread surface, the grounding of the wheel is achieved. Furthermore, it is performed smoothly and the quietness during running is improved.

FIG. 1 is a side view of a walking type management machine that is a walking type tiller employing the basket of the present invention. A mission case 1 having a bifurcated lower part in a side view constitutes a fuselage frame.

  A wheel 4 is provided on the lower rear side of one of the two bifurcated parts of the mission case 1 via an axle. The wheels 4 are provided on the lower left and right sides of the mission case 1. A rotary 6 that is a tilling device for tillage is provided via a rotary shaft on the lower front side, which is the other lower end side of the bifurcated portion of the mission case 1.

  An engine 7 is mounted on the top of the mission case 1. A fuel tank is disposed above the engine 7, and the upper portion of the fuel tank is covered with a bonnet 8. The transmission case 1 includes a transmission including a travel transmission mechanism that shifts the travel drive force for the wheels 4 and a rotary transmission mechanism that shifts the rotary drive force for the rotary 6.

  A driving force is transmitted from the engine 7 to the transmission via a transmission mechanism or the like. A main clutch is provided on the transmission mechanism side. Transmission of driving force from the engine 7 to the transmission is freely controlled by the main clutch. As the main clutch is engaged, a driving force is transmitted from the engine 7 to the transmission, and the wheels 4 and the rotary 6 are rotationally driven.

  A pair of left and right brackets 11 are fixed to the rear of the mission case 1 obliquely upward. A handle 12 is attached to the rear end of the bracket 11 so as to be swingable back and forth. The handle 12 is provided with a clutch operating lever 13 for swinging the main clutch. The driving of the wheel 4 and the rotary 6 can be turned on and off by the clutch operating lever 13.

  From the mission case 1, a main operation lever 14 for projecting rear wheels 4 and the rotary gear 6 is provided. The main operation lever 14 protrudes rearward through the lever guide 16. The main operation lever 14 can be swung along the lever guide 16. A shift operation of the traveling speed (drive speed of the wheels 4) and a drive speed of the rotary 6 and a shift operation in the rotation direction can be performed by swinging the main shift lever 14.

  In this walking type management machine, the wheel 4 is grounded, the operator holds the handle 12, the engine 7 is operated, the main clutch is engaged by the clutch operating lever 13, and the wheel 4 on the rear side is operated. The machine body travels by driving and the tillage work can be performed by the rotary 6 that rotates as the machine body travels.

  A gauge wheel 18 is provided in front of the mission case 1 via a gauge wheel arm 19 so as to be freely rotatable. The aircraft travels while the wheel 4 and the gauge wheel 18 are in contact with each other. The tilling depth can be set and adjusted by swinging the gauge wheel arm 19 and setting the height position of the gauge wheel 18.

  At the position between the engine 7 and the rotary 6 in the transmission case 1, both base ends of a bowl-shaped lifting handle 22 having a substantially inverted U shape in plan view are fixed. The lifting handle 22 extends forward of the machine body so as to bypass the rotary 6. The front side of the lifting handle 22 is fixed to the bracket 17 side that supports the gauge wheel arm 19.

  The upper part of the rotary 6 is covered with a rotary cover 23 that extends forward from a lower position of the engine 7. The rotary cover 23 is an integrally molded product made of resin, and the lifting handle 22 forms a frame. The rotary cover 23 covers only the upper part of the rotary 6 along the rotation locus of the rotary 6.

  The lifting handle 22 projects forward from the rotary cover 23. The operator can easily lift the aircraft by using the lifting handle 22 (the protruding portion from the rotary cover 23) as a front handle.

2 is a side view of the wheel 4 alone, FIG. 3 is a cross-sectional view taken along the line AA, and FIG. 4 is a partial plan view. The wheel 4 includes a wheel 26 and a tire 27. The wheel 26 includes a boss 28 into which an axle is inserted and fixed, a spoke 29 protruding in a cross shape from the boss 28, and a circular ring-shaped rim 31 welded to the tip of the spoke 29.

  The tire 27 is made of a rubber material, and includes a tire body 30 that includes a rim 31 and whose surface forms a tread surface of the tire 27, and a lug 32 that is formed to protrude from the surface (tread surface) of the tire body 30. ing. The lugs 32 are provided at equal intervals with respect to the rotation direction of the tire 27.

  The tire body 30 is formed so that both widthwise sides gradually increase toward the outer periphery. This enlarges the tread surface and prevents the wheels 4 from sinking more than necessary in the field. A side surface of the tire body 30 is a sidewall of the tire 27. On the inner peripheral side of the tire body 30, a protruding portion 30a protruding in the radial direction is formed. The protrusion 30a prevents mud from accumulating on the inner peripheral side of the wheel 4 (tire 27).

  The lug 32 includes a vertical lug 32a that intersects at the center and a lateral lug 32b that intersects eccentrically, and has a Latin cross shape in a plan view. The ends of the vertical lugs 32a and the horizontal lugs 32b and the intersections of the vertical lugs 32a and the horizontal lugs 32b have a relatively large radius R. The peripheral surface of the lug 32 is tapered, and a relatively large diameter R is taken at the intersection with the tread surface.

  The vertical lug 32a has a center line that coincides with the center line of the tread surface of the tire and protrudes from the center of the tread surface in the outer peripheral direction. The lateral lug 32 b is orthogonal to the rotational direction of the tire 27. Since the lug 32 has a Latin cross shape, the horizontal lug 32b includes a long portion 32bL and a short portion 32bS with the vertical lug 32a interposed therebetween.

  As for the long part 32bL in the side lug 32b, a side end protrudes from a sidewall. The short portion 32bS of the lateral lug 32b is in a range within the width of the tread surface. Each lug 32 is provided so that the protruding directions of the long portions 32bL of the lateral lugs 32b are alternately opposite.

  The outer end of the long portion 32bL of the lateral lug 32b extends substantially vertically toward the boss 28 from the top to the position near the upper edge of the sidewall in a cross-sectional view, and from the substantially vertical extension end, The shape extends to the vicinity of the lower edge of the side wall while inclining at an angle that extends the inclined surface on the inner peripheral side of the side wall. The protruding shape of the long portion 32bL is an atypical inverted triangle as shown in FIG.

  The outer end of the short portion 32bS of the lateral lug 32b extends while inclining from the top located inside the side end of the tread surface to the upper end edge of the sidewall (side end of the tread surface) in a cross-sectional view. The shape is out.

  Due to the latin cross shape of the lug 32, the linearity of the vertical lug 32a is not conspicuous, and there is no space on one side of the vertical lug 32a, so that the tread pattern of the tire 27 as a whole is zigzag arranged. The impression becomes stronger. The lug shape (tread pattern) that is most conspicuous as the appearance of the tire 27 is a Latin cross shape, and each corner portion including the peripheral corner of the lug 32 is rounded, so that a delicate and soft impression is obtained.

  In the wheel 4, the horizontal lug 32 b of the lug 32 of the tire 27 protrudes not only in one direction orthogonal to the vertical lug 32 a in a plan view but also in both directions. Thus, a high traction force can be secured, and the aircraft can be run without slipping even in a relatively soft field.

  At this time, the horizontal lug 32b has a short portion 32bS that is shorter than the long portion 32bL on the opposite side of the long portion 32bL across the vertical lug 32a, and therefore, mud clogging at the intersection between the vertical lug 32a and the horizontal lug 32b is reduced. The mud clogging of the wheels 4 can be prevented.

  When the aircraft is traveling, the long portions 32bL that protrude toward the inside of the aircraft and the long portions 32bL that protrude toward the outside of the aircraft are alternately grounded, so that the grounding is smoothly performed, and vibration during traveling is generated. Less. In particular, since the outer end portions of the long portion 32bL and the short portion 32bS of the lateral lug 32b are formed as described above, the grounding is performed more smoothly and the quietness is improved. Since the lug 32 has a Latin cross shape, the rotation of the tire 27 has no directionality, and the tire 27 of the left and right wheels 4 can also be used.

  In the above embodiment, since the lug 32 has a Latin cross shape, the long portion 32bL and the short portion 32bS of the horizontal lug 32b are arranged on a straight line with the center line coincident. On the other hand, as shown in FIGS. 5A and 5B, the long portion 32bL and the short portion 32bS of the lateral lug 32b can be arranged with their center lines shifted from each other.

  Also in this case, it is possible to improve the traction force by the long portion 32bL and to prevent mud clogging at the intersection of the vertical lug 32a and the horizontal lug 32b by the short portion 32bS. However, since the direction of rotation of the tire 27 is generated, the tires 27 of the left and right wheels 4 cannot be used together.

It is a side view of a walk type management machine. It is a side view of a single wheel. It is AA sectional drawing of FIG. It is a partial plane development view of a single wheel. (A), (b) is the plane expanded view of the lug of other embodiment.

Explanation of symbols

27 Tire 30 Tire body (main body)
32 lugs 32a vertical lugs 32b horizontal lugs 32bL long (horizontal lugs)
32bS short part (horizontal lug)

Claims (2)

The surface is composed of a main body (30) constituting the tread surface of the tire (27) and a lug (32) formed to protrude from the tread surface, and the lug (32) is at the center of the tread surface of the tire (27), Agricultural equipment comprising a vertical lug (32a) projecting toward the outer peripheral direction at equal intervals in the rotational direction, and a horizontal lug (32b) projecting from the vertical lug (32a) in a direction orthogonal to the rotational direction in a plan view. In the tire of the wheel, the circumferential surfaces of the vertical lugs (32a) and the horizontal lugs (32b) are tapered so as to be thick at the crossing portions and the boundary portions with the tread surfaces, and the horizontal lugs (32b) Projecting from the vertical lug (32a) in two directions orthogonal to the rotational direction in a plan view, one lateral lug (32bL) is formed longer than the other lateral lug (32bS), Rug (32b ) Was protruded from the sidewall of the tire (27), the short side of the lateral lugs (32BS), housed in a tread surface of the tire (27) in plan view, the width direction toward the main body (30) on the outer periphery of its The long side lug (32bL), which is formed into a shape that widens both sides and protrudes outward from the main body (30), is inclined at an angle that extends the inclined surface on the inner peripheral side of the side fall. An agricultural wheel tire in which the lateral lugs (32bL) are formed so as to reach the lower end edge side of the side fall, and the lugs (32) are arranged so that the protruding directions of the long lateral lugs (32bL) are alternately arranged in order. .   Agricultural use according to claim 1, wherein the short side lug (32bS) is configured such that the top of the outer peripheral tip is located inside the side end of the tread surface and the lower end is located at the side end of the tread surface. Wheel tire.

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