JP3604490B2 - Traveling body with lug and method of manufacturing the same - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a traveling body with lugs used for a tire or a crawler of an agricultural machine (a tractor, a combine, a rice transplanter, a transport vehicle, etc.) and a light construction machine (a trencher, a dozer, etc.) traveling on a wetland, a soft land, or the like. And a method of manufacturing the same.
[0002]
[Prior art]
When traveling on wetlands, soft land, etc. with a tractor equipped with a traveling body such as a tire with lugs, there is a problem that mud adheres to the groove bottom between the traveling lugs and impairs traction, and in order to solve such problems Japanese Patent Application Laid-Open No. 6-329000, a rotating or circulating running lug in which running lugs are arranged on a tread with a circumferential interval, and It has been proposed that the tread has self-absorbing property and elastic resilience upon draining of absorbed water, and is provided with a mud separation accelerating device (mud separation means) at a position lower than the height of the traveling lug. ing.
[0003]
That is, this peeling promotion device is made of sponge-like foamed rubber or the like by open cells, and when traveling on a soft ground, etc., absorbs water and the like contained in mud by self-water absorption and holds it. The water is compressed when the soft layer is embraced, and the water retained by the compression is drained to form a water film at the interface with the soft layer. The attached soil is peeled off by force to prevent it from rotating.
[0004]
[Problems to be solved by the invention]
However, since the above-described traveling body with lugs employs sponge-like open-cell foamed rubber as a mud separation promoting device, when absorbing muddy water or the like, mud may also enter the bubbles. As a result, mud accumulates in the bubbles as the drainage action is repeated. Therefore, if mud accumulates in this way, the muddy water absorption, elastic deformation and elastic restoration cannot be sufficiently performed. In other words, in the early stage of use of the traveling body with lugs, the sponge-like foamed rubber functions as a mud peeling device, but its function gradually deteriorates with continued use, and eventually, the mud adhesion prevention and adhesion soil are finally reduced. Peeling effect was low.
[0005]
Then, in view of the above-mentioned problem, an object of the present invention is to provide a lug-equipped traveling body that enables reliable removal of adhered soil even with continued use. Another object of the present invention is to provide a method of manufacturing a traveling body with lugs that can easily form such a traveling body with lugs.
[0006]
[Means for Solving the Problems]
The present invention has taken the following technical measures to achieve the above object.
That is, in the traveling body with lugs of the present invention, a large number of traveling lugs 8 are provided at least on the outer periphery of the tread 7 between the traveling lugs 8 of the traveling body 1 in which the traveling lugs 8 are arranged at intervals in the circumferential direction. The thickness of the foamed rubber 11 having closed cells at the center in the circumferential direction between the running lugs 8 is thicker and gradually thinner outward from the center in the circumferential direction. A plurality of sipes 11a are formed at intervals in the rubber 11.
[0007]
In addition, the method for manufacturing a traveling body with lugs according to the present invention comprises the step of forming a raw tubular traveling body main body 1G in which traveling lugs 8 are arranged at intervals in a circumferential direction at least at an outer peripheral portion between the traveling lugs 8. A plurality of fins including weirs 19 at both ends in the circumferential direction are provided at the center in the circumferential direction of the inter-lug forming portion 17 in a state where the foamed rubber 11G having a large number of closed cells is adhered to the lug forming portion 17. The vulcanization molding die 16 formed at an interval is charged, and the traveling body 1G and the foamed rubber 11G are inflated and pressed against the lug formation portion 17 and the lug formation portion 18 of the vulcanization molding die 16, and when, by vulcanization molding by preventing the inflow of the lug between forming portion 17 to the lug forming portion 18 of the foam rubber 11G by dam 19 of the circumferential ends of the plurality of fins 20, by the plurality of fins 20 It is characterized in that a plurality of sipes 11a is formed at intervals in the foamed rubber 11G of the circumferential center section of the serial lug between forming portion 17.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In FIGS. 1 to 3, a running body 1 exemplified by a pneumatic rubber tire with an agricultural lug is fitted to a rim of a wheel and includes a tube 3 therein, and the tube 3 can be filled with air via a valve 4. It is. However, it may be a tubeless or a solid rubber tire.
[0009]
The traveling body 1 includes a pair of annular bead portions 5, a sidewall 6 and a tread 7 that are continuous in a toroidal shape between the two bead portions 5, and a running lug 8 having a trapezoidal cross section is alternately formed on the outer periphery of the tread 7. Are arranged in a zigzag pattern at intervals in the circumferential direction, and between the running lugs adjacent in the circumferential direction are concave portions 9 that are curved in the radial direction.
Mud stripping means 10 is provided on the tread 7 so as to cover the running lug 8 and the recess 9 over the entire circumference.
The mud stripping means 10 is made of foamed rubber 11 having a large number of closed cells in which gas does not flow inside and outside and water does not enter. 9), a plurality of sipes 11a are formed at intervals in the circumferential direction and over the width of the tread 7.
Hereinafter, the production (vulcanization molding) state of the traveling body 1 with lugs will be described.
[0010]
As shown in FIG. 4 (a), a raw tire G is formed by winding a band-shaped foamed rubber 11G around the outer periphery of a running body 1G in a tubular state. Is loaded into the mold 16 of the vulcanizing apparatus having
The vulcanizing mold 16 is divided into upper and lower halves, and the upper and lower halves are each divided into a plurality of parts such as two parts in the left-right direction, four parts, and the like. , A portion (concave portion) 18 forming a traveling lug and a portion (convex portion) 17 forming a space between lugs are alternately arranged in the circumferential direction.
[0011]
A plurality of fins 20 erected in the protruding direction of the molding die 16 in the protruding direction of the protruding portion 17 are spaced from each other in the circumferential direction and project over the tread width. Of the tire tread at the time of molding does not reach the carcass cord.
Then, the green tire G around which the band-shaped foamed rubber 11G is wound is loaded into the molding die 16, and the green tire G is pressed against the inner surface of the molding die 16 by expansion of the bladder 15 to perform vulcanization molding.
[0012]
At this time, as shown in FIG. 5A, the foamed rubber 11G portion of the raw tire G first comes into contact with the convex portion 17 of the molding die 16, and the raw tire G comes into the concave portion 18 by further expansion of the bladder 15. The running lugs 8 are formed as shown by arrows a, and the fins 20 (especially, the fins 20 at both ends in the circumferential direction) formed in the projections 17 are in contact with the foamed rubber 11G. Of the foam rubber 11G in this portion is prevented from flowing into the recess 18, and therefore a sufficient thickness of the foam rubber 11 is secured between the running lugs 8. Will be done. At the same time, a plurality of sipes 11a are formed at intervals in the circumferential direction of the tire 1 by the fins 20. When the mold is removed from the tire 1 after vulcanization molding, the mold 16 is divided in the protruding direction (radially outward) of the fins 20 in order to prevent damage to the fins 20 and chipping of the tire 1. And remove it. Oite When this position of the lug 8 for a layer of foam rubber 11 is not thick, cracking of foam rubber 11 during mold withdrawal is prevented peeling.
[0013]
FIG. 6 shows a state in which the vehicle travels on a soft ground or the like by using the thus-formed tire 1 with lugs.
In other words, the foamed rubber 11 portion of the traveling body 1 in contact with the soft layer X1 on the tillage pad X is elastically deformed by being compressed without leaking a large number of air bubbles (gas) forming a containing group to the outside. When the body 1 is separated from the soft layer X1 by the rotation of the body 1, the mud X2 adhered by the elastic restoring force of the foam rubber 11 due to the release of the compression of the gas is positively peeled off. Therefore, the elastic recovery of the foamed rubber 11 is reliable and strong because of the compressed gas that does not leak to the outside, and the clogging of the mud into bubbles by absorbing muddy water as in the related art is also eliminated, Even when used continuously, the mud peeling function hardly deteriorates.
[0014]
Furthermore, since a plurality of sipes 11a are formed in the foam rubber 11 between the lugs 8, the foam rubbers 11 separated by the sipes 11a can move differently from each other, so that the mud X2 can be more easily separated. It will further promote. The sipe formed on the foamed rubber was not only provided at intervals in the circumferential direction as described above, but also provided at intervals in the axial direction of the tire, provided in both the circumferential direction and the axial direction. (Grating) may be used.
[0015]
In addition, it is preferable that the cell diameter of the foamed rubber 11 employed in the present invention is 0.2 mm or more. This is because when the thickness is set to 0.2 mm or less, the elastic restoring force of the foamed rubber 11 is reduced in removing the mud through the compression of the bubbles, and the effect is reduced. Further, if the bubble diameter is too large, there is a possibility that damage such as chipping of the foamed rubber 11 may be caused during traveling, so that the bubble diameter is preferably 5 mm or less.
[0016]
7 and 8 show a second embodiment of the present invention. In this embodiment, the foam rubber 11 as the mud removing means 10 is provided only between the traveling lugs 8 of the traveling body 1, particularly with a large amount of mud adhesion (mud clogging). It has something.
When the traveling body 1 according to the present embodiment is vulcanized and formed, as shown in FIG. A green tire G is formed by attaching a foamed rubber 11G similar to that shown in the embodiment, and is loaded into a molding die 16 and vulcanized. A pair of fins 20 protrude in the circumferential direction at the projection 17 corresponding to the space between the lugs 8. The interval between the pair of fins 20 is equal to or slightly wider than the interval between the lugs 8, that is, the circumferential width of the foamed rubber 11G attached to the raw tire G.
[0017]
Therefore, when the traveling body 1 is formed, the rubber flow of the foamed rubber 11G is prevented by the fins 20, so that the foamed rubber 11G does not easily flow into the lug 8 forming portion, and the foamed rubber 11G between the lugs 8 has a sufficient thickness. The thickness of the lug can be ensured, the mud can be reliably separated in the same manner as in the first embodiment, and the lug 8 has no troubles such as peeling of the foamed rubber from the lug 8 during running. Strength can be secured and sufficient traction can be obtained.
[0018]
Note that, also in the present embodiment, a large number of fins may be formed between the pair of fins 20 as in the first embodiment.
In the traveling body with lugs of the first and second embodiments, the foamed rubber as the mud removing means is integrally vulcanized and bonded, but after the traveling body with lugs is formed, it is separately bonded with an adhesive or the like. You may.
[0019]
FIG. 9 shows a third embodiment of the present invention in which a mold 16 for vulcanization is changed, and the mold 16 has a convex portion 17 corresponding to a space between the lugs 8. A notch concave portion 21 is formed substantially at the center, and the circumferential side wall portion of the concave portion serves as a weir 19, and the foamed rubber 11 G portion of the raw tire G is held in the concave portion 21 to prevent the rubber from flowing to the lug 8 side. You can do it.
[0020]
Note that a plurality of fins may be formed in the notched recess 21 at intervals in the circumferential direction.
FIG. 10 shows a fourth embodiment of the present invention, in which a gap is formed in the tread 7 of the tire 1 along the circumferential direction, and gas is contained in the gap to remove the mud. These gaps are formed at two places separated in the width direction of the tread 7, as shown in the cross-sectional view of FIG. 10 (b).
[0021]
According to the present embodiment, as in the first to third embodiments, the gas contained in the gap of the tread 7 is compressed without leaking to the outside during traveling on soft ground, so that the tread 7 (particularly, the concave portion 9) is compressed. ) Is elastically deformed, and when it separates from the ground, the tread 7 is elastically restored by the compressed gas, so that the mud adhering between the lugs 8 can be surely peeled off.
[0022]
In addition, the manufacturing (vulcanization molding) state of such a running body 1 will be described. As shown in FIG. 10 (a), the tread is provided on the outer periphery of a portion corresponding to the tread of a tubular running body 1G. Two stripping materials 13 made of stretchable organic fiber cloth such as nylon or polyester, which are narrower than half the width of the corresponding part, are spaced apart (corresponding to the left and right lug formation positions). The belt-shaped rubber sheet 7G constituting the outer peripheral surface of the tread 7 is further wound from the outer periphery thereof, and the release material 13 is sandwiched therebetween. Then, by performing vulcanization, the running body 11G and the rubber sheet 7G are vulcanized and bonded at portions other than the portion where the peeling material 13 is adhered, and the running body 1G and the rubber sheet 7G are peeled off at the portion where the peeling material 13 is affixed. Promptly, a void is generated in this portion to contain gas. Therefore, such a gas can be easily included in the tread 7.
[0023]
The rubber sheet may be a tread rubber forming a running body or a foamed rubber having closed cells as described in the above embodiment. When foamed rubber is used, the bubbles contained therein can further promote the separation of the mud, and the peeling material 13 has an effect of preventing the rubber flow of the foamed rubber. It is possible to sufficiently secure the thickness of the foamed rubber.
[0024]
Then, the release material 13 can be attached so as to correspond only between the lugs 8.
In addition, as the release material 13, not only a woven fabric but also a knitted fabric can be used, and not only nylon or the like but also cotton, silk cloth, or the like can be used.
FIGS. 11 and 12 show a fifth embodiment of the present invention, which has a straight lug 8A and a wing lug 8B as running lugs 8 on wheels having an annular pipe fixed to the outer ends of the spokes. Fig. 3 shows a traveling body 1 with a rug in which a rubber is coated on a pipe, and a mud peeling made of a foamed rubber 11 as in the first to third embodiments on a tread 7 between a rectilinear lug 8A and between a rectilinear lug 8A and a blade lug 8B. A means 10 is provided, and its operation is the same as that of the above embodiment.
[0025]
13 to 15 show a sixth embodiment of the present invention, in which a crawler is shown as the traveling body 1 with lugs, and the tread 7 of the crawler 1 travels toward the ground surface side of the elastic crawler belt 23. Mud stripping means 10 made of foamed rubber 11 is provided between the lugs 8 as in the first to third embodiments, and the operation is the same as in the above-described embodiment.
[0026]
In the fifth and sixth embodiments, the foamed rubber serving as the mud removing means may be integrally vulcanized and adhered, or may be separately adhered with an adhesive or the like after forming the running body.
The present invention can be changed in design without being limited to the above-described embodiment. For example, the arrangement of the traveling lugs 8 is arbitrary, and may be a parallel lug arrangement, a cross-shaped arrangement, a cross-shaped arrangement, or the like.
[0027]
【The invention's effect】
As described in detail above , according to the traveling body with lugs according to the first aspect of the present invention, since the foamed rubber 11 provided between the traveling lugs 8 has a large number of closed cells, it can be grounded on a soft ground or the like. In this case, the gas in the large number of closed cells is compressed without leaking to the outside and elastically deformed. The mud adhering between the 8 is actively peeled off. In particular, since the thickness of the foamed rubber 11 is thicker at the center in the circumferential direction and is gradually reduced outward from the center in the circumferential direction, the elastic restoring force of the foamed rubber 11 between the running lugs 8 is determined by the amount of mud adhering. Since the circumferential central portion between the running lugs 8 where the number of the running lugs 8 increases is gradually reduced at both ends, the mud adhering between the running lugs 8 can be effectively separated by the elastic restoring force distribution substantially corresponding to the amount of the adhering. it can. Further, since a plurality of sipes 11a are formed at intervals in the foam rubber 11 between the running lugs 8, the elastic deformability of the foam rubber 11 is improved between the sipes 11a, and the elastic restoring force is reduced. It can be generated independently between the sipes 11a, and the adhering mud can be more effectively separated at each portion with an elastic restoring force substantially corresponding to the amount of adhering mud.
Further, according to the manufacturing method of the second aspect of the present invention, the thickness of the foamed rubber 11 between the running lugs 8 at the central portion in the circumferential direction between the running lugs 8 is thicker and gradually thinner from the central portion outward in the circumferential direction. In addition, a plurality of sipes 11a can be formed at intervals in the foamed rubber 11.
[Brief description of the drawings]
FIG. 1 is a side view of a main part of a traveling body with lugs according to a first embodiment of the present invention.
FIG. 2 is a plan view of the traveling body with lugs.
FIG. 3 is a front sectional view of the traveling body with lugs.
4A and 4B show a manufacturing state of the traveling body with lugs, wherein FIG. 4A is a perspective view showing the traveling body in a raw state, and FIG. 4B is a side sectional view showing a state at the time of vulcanization.
FIG. 5 is an operation view showing a manufacturing state of the traveling body with lugs.
FIG. 6 is an operation diagram of mud removing means of the traveling body with lugs.
FIG. 7 is a plan view of a traveling body with lugs according to a second embodiment of the present invention.
8A and 8B show a manufacturing state of the traveling body with lugs, wherein FIG. 8A is a perspective view showing the traveling body in a raw state, and FIG. 8B is a side sectional view showing a state at the time of vulcanization.
FIG. 9 is a side cross-sectional view showing a manufacturing state of a traveling body with lugs according to a third embodiment of the present invention.
10A and 10B show a manufacturing state of a traveling body with lugs according to a fourth embodiment of the present invention, wherein FIG. 10A is a perspective view of the traveling body in a raw state, and FIG. 10B is a front sectional view after molding. .
FIG. 11 is a side view of a traveling body with lugs according to a fifth embodiment of the present invention.
FIG. 12 is a front sectional view of the traveling body with lugs.
FIG. 13 is a front sectional view of a traveling body with lugs according to a sixth embodiment of the present invention.
FIG. 14 is an overall side view of the traveling body with lugs.
FIG. 15 is a side sectional view of a main part of the traveling body with lugs.
[Explanation of symbols]
REFERENCE SIGNS LIST 1 traveling body with lug 1G traveling body body 7 in raw state 7 tread 7G raw rubber sheet 8 traveling lug 10 mud stripping means 11 foamed rubber 11G foamed rubber 13 organic fiber material 16 molding die 17 convex part 18 concave part 19 weir

Claims (2)

A large number of independent running lugs (8) are provided on the outer periphery of the tread (7) between at least the running lugs (8) of the traveling body (1) in which the running lugs (8) are arranged at intervals in the circumferential direction at the outer periphery of the tread (7). The thickness of the foamed rubber (11) having air bubbles at the center in the circumferential direction between the running lugs (8) is thicker and gradually thinner outward from the center in the circumferential direction, and the circumferential direction between the running lugs (8) is increased. A traveling body with lugs, wherein a plurality of sipes (11a) are formed at intervals in the foamed rubber (11) at the center. The method for manufacturing a traveling body with lugs according to claim 1, wherein a raw tubular traveling body main body (1 </ b> G) in which traveling lugs (8) are arranged at intervals in a circumferential direction is formed on an outer periphery thereof. In a state where foamed rubber (11G) having a large number of closed cells is stuck to at least the portion between the running lugs (8), the rubber to the lug forming portion (18) is provided at the center in the circumferential direction of the portion between the lugs (17). A plurality of fins (20) including flow-stop weirs (19) at both ends in the circumferential direction are loaded into a vulcanization mold (16) formed at intervals and the traveling body (1G) and the foamed rubber (11G) are loaded. ) Is inflated and pressed against the lug forming portion (17) and the lug forming portion (18) of the vulcanizing mold (16), with the weirs (19) at both ends in the circumferential direction of the plurality of fins (20). A lug is formed from a portion (17) between the lugs of the foamed rubber (11G). Min by (18) flows is prevented to vulcanization molding, the plurality of fins (20) by sipes in the circumferential direction central portion foamed rubber plurality of the (11G) said lug between forming portion (17) ( 11a) The method for manufacturing a traveling body with lugs, wherein the traveling body is formed at intervals .

Images