CA2113942A1 - Canvased tire and method of manufacturing same - Google Patents
Canvased tire and method of manufacturing sameInfo
- Publication number
- CA2113942A1 CA2113942A1 CA 2113942 CA2113942A CA2113942A1 CA 2113942 A1 CA2113942 A1 CA 2113942A1 CA 2113942 CA2113942 CA 2113942 CA 2113942 A CA2113942 A CA 2113942A CA 2113942 A1 CA2113942 A1 CA 2113942A1
- Authority
- CA
- Canada
- Prior art keywords
- tire
- canvas
- canvased
- piece
- tlre
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D55/00—Endless track vehicles
- B62D55/08—Endless track units; Parts thereof
- B62D55/14—Arrangement, location, or adaptation of rollers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D30/00—Producing pneumatic or solid tyres or parts thereof
- B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
- B29D30/38—Textile inserts, e.g. cord or canvas layers, for tyres; Treatment of inserts prior to building the tyre
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D30/00—Producing pneumatic or solid tyres or parts thereof
- B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
- B29D30/72—Side-walls
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C13/00—Tyre sidewalls; Protecting, decorating, marking, or the like, thereof
- B60C13/002—Protection against exterior elements
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Textile Engineering (AREA)
- Tires In General (AREA)
- Woven Fabrics (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A canvased tire for use as a pneumatic tire on a motor vehicle has at least one stretchable piece of canvas made of organic fibers which is disposed in an axial posi-tion on an outer surface of a tire and extending fully in a circumferential direction of the tire. The piece of canvas makes durable an outer circumferential surface of the tire on which it is disposed. The canvased tire is manufactured by fitting at least one stretchable ring-shaped piece of canvas over an outer circumferential surface of a green tire in a predetermined axial position thereon, bonding the ring-shaped piece of canvas to the green tire, and there-after vulcanizing the green tire in the mold of a vulcan-izer thereby to produce a canvased tire with the piece of canvas attached thereto.
A canvased tire for use as a pneumatic tire on a motor vehicle has at least one stretchable piece of canvas made of organic fibers which is disposed in an axial posi-tion on an outer surface of a tire and extending fully in a circumferential direction of the tire. The piece of canvas makes durable an outer circumferential surface of the tire on which it is disposed. The canvased tire is manufactured by fitting at least one stretchable ring-shaped piece of canvas over an outer circumferential surface of a green tire in a predetermined axial position thereon, bonding the ring-shaped piece of canvas to the green tire, and there-after vulcanizing the green tire in the mold of a vulcan-izer thereby to produce a canvased tire with the piece of canvas attached thereto.
Description
2113~2 CANVASE~ TIRE AND METHOD OF MANUFACT~RING SAME
sAcKGRouND OF TH~ INV~N~IO~
Field of the In~ention:
The present lnventlon relateq to a canva~ed tlre havlng ~ide walls each lined with a piece of canva~ and a m~thod of manu~acturing such a canvased tire.
De~crlption ~f the Prior Art:
Tires for use on automobiles are required to have their slde wall outer surfaces highly durable, i.e., resistant to cuts, cracks, and c~lcr change~, and less frictlonal, ~.e., low in coe~lcient of frlction.
However, there have not been available, and hence there have been great demands for, lnexpenslve tlres 15 of slmple structure whlch can easily and safely be manufac-tured that meet the above requirements.
SUMMARY OF THE INV~NTION
It is therefore an ob~ect of the present lnven-tlon to provide a canvased tlre having slde wall outer sur-20 face~ which are resistant to cut~, cracks, and color ch~nges, and have a low coefflclent of frictlon for high durabillty, and a method of manu~acturing such a canvased tire.
According to the pre~en~ inventlon, there is pr~vlded a canvased tlre compri~lng a tlre h~vln~ a~ outersurface, and at lea-~t one ~tretchable piece of canvas made of organlc fiberq which ~9 diQposed ln an axial position on th~ outer Rurface and extending fully ~n a circumferential direction of the tire. The tixe has an outer clrc~mferen-2~1 39~2 - tla~ surface having a trans~erse cross section composed of a cen~ral tread, a pair of spaced shoulder~ extending re-spectlvely from oppo~lte ides of the central tread, a palr of apaced 9~ de walls extending respect1vely from the ~houl-ders, and a pa~r of ~pace~ bea~s dlsposed ~espectlvely onends o~ the side walls, the piece of canvas ~eing bonded to each of outer surface~ of the ~ide walls upon vulcanization of the tire. The organic fibers may be made o~ nylon whereby the piece of canvas ls re~iqtant to cuts, cracks, and color changes.
If the tire ~s used as a drive tire for use on a tlre-driven crawler, then pieces of canvas of orqanic fibers, particularly nylon canvas, are attached to outer surface portlon.~ of the tir~ wh~ch wlll engage a crawler lS belt trained around the tire when the tlre-driven crawler make~ a 8harp ~urn or runs on a slope. The pleces of can-vaq thu~ po~itioned are ~f~ective ~o reduce ~riction be-tween the tire and the crawler belt for t~ereby preventing the tire rrom being dislodged ~rom the crawler belt. Since the tlre and the crawler belt are held ln contact with each other under low frictional forces, any abrasive wear on the drlve tlre 19 reduced and its durab111ty is increased~
The canvased tire may ~e manufactured by ~ltting at least one stretchable ring-shaped pi~ce of canvas fitted over an outer circumferen~ial ~urface of a green tire ln a predeterm~ned axial poqition thereon, bo~ding the rlng-shaped piece of canvas to the green tlre, and there~ftèr vulCanlzlns the green tlre in the mold of a vulcanizer thereby to produce a canvaqed tlre with the plece of canvas 2~13~42 attached thereto.
T~ a~o~e and further ob~ect~, datails and ad-~antages of the present invention will beome appare~t from the followlng detailed de.~cription of preferred embodiments 5 thereof, when read in conjunctlon with th~ accom~anying drawlngQ .
BRIEF DESCRTPTION OF THE DRAWINGS
FIG. 1 is a fragmentary transverse cross-sec-tional view of a canvased tire, for ~se a3 a pneumatic ra-dial tlre on an automobile, according to a flrst embodl~entof the present i~vention;
FlG. 2 i~ a per~pect~ve view of a ringoshaped piece of canvas which can be used ln the canvased tlre shown ln FIG. l;
~IG. 3 18 a perspective view of a green tire over wh~ch ring-shaped pleceg of canvas as shown in FIG. 2 are fitted;
FIG. 4 is ~ fragmentary tranAverse cros~-sec-tional vlew of a canvased tlre, ~or use on a tire~drlven crawler, accordl~g to a -~eco~d embodlment of the pr~sent lnvention;
FI~. S ls a tran~verse cross-sectlonal vlew of tho canvased tire shown in FIG. 4 with a crawler belt tra~ned ~herearound;
FIG. 6 1~ a tran~verse cross-sectlonal ~iew of a canvased tlre, ~or use on a tlre-drlven crawler, accordlng to a thlrd embodlment of the present inven~ion, with a crawler belt tralned on the canvased tire; and FIG. 7 i~ an enlarged fragment2ry cross-sec-2~13~2 `' tlonal view of an encircled pOrtiQn VII o~ the assen~bly shown ln F~G. 6.
DETAII,ED D}~SCRIPTION OF THF. PREFERRED EMBO~IMENTS
A3 ~ho-~n ~n FIG. 1, a canva~ed tire 10, which is 5 ~uitable for use as a pneumatlc radial tlre on an automo-bile, according to a firgt embodiment of the present inven-tlon includes a tread 1 dlsposed on a radially outer wall thereof and extendlng transver~ely centrally across the ~a-dlally outer wall. The tire 10 also includes a pair of shoulders 2 posit~oned one on each slde of the tread 1, a pair of ~ide walls 3 extending respectively from opposlte sides of the shoulder~ 2 in spaced-apart relationshlp from each other, and a palr of beads 4 dispo~ed respectlvely on radially lnner ~nd~ of the side walls 3. Each of the beads 2 lncludes a bead core 5 e~bedded thereln. The tlre 10 in-cludes a carcass ply 6 embedded in and extending c~ntinu-ou~ly through the tread 1, the side walls 3, and the beads 4, and a re~nforcing belt layer 7 embedded ln the tread 1.
The tread 1, the shoulders 2, the side walls 3, and the 20 beads 4 are made of ~ubber. The tire 10 is o~ a toroldal Qhape as a whole. :~or the sake of brevity, only a rlght-hand croqs-sectional portion of the tire 10 is shown for lllustratlve purpo~e in FIG. 1.
Accordlng to the f~rst embodiment, the outer 25 surfac~ of each of the slds w311s 3 iS rendered durable by an elongate pieCe of canvas 9 whlch extends fully or ~ub-stantially fully over the outer surface a}ong itQ circum-ferential length. E;ac~ of the pieces o~ canva~ 9 on the re~pective outer 8urfaces of t}~e 3ide walls 3 com~rlses a . , . .,, .... . ., . , ., . .... , ..... . ., .. .. . ~
2113~2 ~ stretchably Xnit~ed cloth of organic fibers as of nylon or the llk~. The plece~ of canva-q 9 are effective ln m~klng the outer surfaces of the ~de wall~ 3 highly durable, i.e., highly reslstant to cuts, cracks, and colox changes.
Slnce the durabillty of the cide walls 3 of the tlre 10 19 lmproved ~imply by the pieces of canvas 10 ll~ed on the re-spec~,ive outer surface~ o~ the side walls 3, wlthout modl-fyin~ the rubber of the tlre 10, the side wall.~ 3 llned wlth the pieces of canvas 9 remaln relatively slmple in 10 structure. The plece~ of canvas 9 are inexpensive because they are knltted of organic flbers as of nylon.
The tire 10 shown in FIG. 1 1~ manu~actured a~
follow~: First, a ~heet of canvas is cut to a deQired elongate slze, and then the cut length of canvas ls rolled lnto.a rl~ 8hape 9 with ~ts long~tudinal opposlte ends ~ewn or stapled to each other, as shown in FIG. 2.
Thereafter, as shown in FIG. 3, the rln~-~haped piece of canvas 9 is f~tted over each axlal end of a green tlre 11 that has been formed by a tire ~ormin~ machlne, and bonded thereto by a ~olution of rubber ln gasollne or rubber Cement.
The green tlre 11 with the ring-shaped pieces of' can~a8 9 is then place~ in the mold of a tire vulcanlzer, and vulcanized at high te~perature under hlgh pre-~ure~
thereby forming the tlre 10 wlth the bonded pieces of can-~a~ 9.
Since the plece~ o~ canvas 9 are typically made of nylon flbers~ they can be bonded dlrectly to the g~e~
tire 10. It ls therefore no~ neces~ary ~or the worker to ~1 ~ 3~42 enter the mold of the ~lre vulcanl~er a~d ma~ually mount the pieces of canvas 9 in the mold. Conseque~tly, th~ tire iO can be manu~a~tured safely and ~aslly.
~he positions where the ring-shap~d pieces of canv~s 9 are f~ed to the green tlre 11 are determlned by comparing the green tire 11 and the tlre 10 that i3 to be formed from the green tlre 1l.
When 'che green tlre ll ls vulcanized by the tire vulcani2er, the pleces of canvas 9 are elongatéd ln the circumferentlal direction preferably by an elongation of up to 160 %. If tne piece~ of canvas g were elongated beyond 160 %, then the knitted fiber threads thereof would become too co~rse to achieve a desired degree of tlre durab~ llty.
The elongation is given as the ratlo of the circumferential 15 length LM of the outer circum~erentlal edge o* the pieces of canva~ 9 mounted on the tire 10, i.e., the circum~eren-ti81 length o~ the corresponding area of an inner ~urface of the mold in the tire vulcanizer, to the length LG of the cut length of canvas 9, the ratio belng expressed by 20 (I-M/LG) x 100.
When the pieces of canvas 9 are elongated in the tire wlcanizing process, their width ls reduced.
Therefore, when the lengths of canvas cut from the ~heet o~
canva8 should have a w~dth greater than the pieces of can-25 va~ 9 mounted on the tlre 10. Incidentally, if the pieceso canva-~ 9 are elongated ln the circum~erentlal dlrection by an elong~t~on of 160 %, then thei~ width is reduced by 20 %.
FTGS. 4 and S show a canvased tlre 20 accordlng - 6 ~
21~ 3~a~2 -_ to a second embodlment of l:he pre~nt inventlon. Th~ can-vased tire 20 ig preferably u~ed aq a drive ~ire on a tire-driven crawler ~uch as ~ crawler tractor or the like.
As Qhown 1~ FIG. ~, the canvase~ tire 20 which 5 ls a pneumatlc tire include~ a tread 21 and a pair o~
shoulders 22 dlspo8ed one on e~ch olde of the! tread 21 and havi~g a tapered shape including an uppex portlon (as viewed in FIG. 4) that s~oothly blends into t~e tread 21.
The canvased tire 20 according to the second embodlmçnt is desi~ned not only to make durable the outer surfaces of the side walls of the canvased tire 20, but also to lower the coefficleDt of frlctlon o~ the canvased tire 20.
More speciflcally, the canvased tlre 20 includes a pair of pleces of canvas 29 each disposed on and extend-lng over the outer surfaces of each lateral slde area ofthe troad 21, each shoulder 22, and an upper port~on (a~
viewed ~n FIG. 4) of each slde wall 23 which terminateS in a bead 24. Eac~ of the pieces of canvas 29 comprlses an elastically knitted cloth of organic fiber~ as of nylon or the llke. The ple.ce~ of canvas 29 thus positloned on the tir~ 20 are effecti.ve to reduce the coefflcient of frictlon for maklng the tlr~ 20 reslstan~ to belng dislodged from a crawl~r belt. ~er~tofor~, when a tlre-d~iven crawler ~kes a sharp turn or runs on a slope, the tlre tends to ride on a ~ide guide on the inner circumferential surface o~ the crawler belt, bringlng a portion of a shoulder of the t~ re lnto lntcnslve contact wlth a portion of the s~de guid~.
The tlre thus applles a lateral force to the crawler bolt, wh~ch ls skewed due to a bending moment impo~ed thereon, 39~2 possibly causing the tlre ~o be dislodged from the crawler belt. Accord4ng to the present inventlon, however, as shown ln FIG. 5, th~ canvased tl~e 20 is used as a driv~
tire on a tire-dri~en crawle:r, and th~ piece of can~as 2 5 are po~ltioned ln engag~ment wlth portlons o~ side guld~3 28' o~ a crawler belt 28, whlch portions wlll be held in lntens~ ve contact wlth the pleces o~ canvas 29 when the tire-driven crawle~ makes a -qharp turn or run~ on a ~lope.
The pieces of canvas 29 thus positioned serve to prevent the tlre 20 from rlding onto each of ~he ~ide guides 28' of the crawler belt 28. Since the pleces of canvas 29 provide a low coefficient of frlction, they prevent the tlre 20 and the crawler belt 28 from being abraded qulckly. Therefore, the piece~ of canvas 29 are effecti~e in lncreaslng the durability of the tire 20.
The canvased tlre 20 accordlng to the second em-bodiment can be manufactur~d ~n substantlally the ~ame man-ner as the canvaced tire 10 according to ~he irst embodi-ment as shown in FIGS . 2 and 3 . Specif lcally~ cut lengths of canva~ knltted o orqaniC fibers are rolled lnto a rlng Bhape wlth }o~gitud:Lnal end~ t~ereof belng sewn or fastened to each other. The rlng-shaped lengths of canva~ are fit-ted over re-~pective axial ends of a green tire, and ~onded thereto by a rubber sol~ent or a rubber cement. The green 25 tire wlth the bonded lengths of canvaS iS then vulcanized at high temperature under high pressure 4n the mold o~ a t're vulca~izer, thus forming the tire 20 wlth the bonded piece~ o~ canva~ 29. On the tire 20, each of the pleces of canvas 29 extend over and between the tre~d 21 and one o~
~ 3~42 `the 3ide walls 23, and is bonded to the outer surfaces of one of the shouLders 22, a portlon of the tread 21, and a portion of the 9~ de wall 23.
A canvaQed tlre 30 accordlng to a thlrd embodi-men~ of the present lnvention wlll now be de~cribed below with reference to FIGS. 6 and 7. The canva ed tire 30 ac-cordlng to ths thlrd embodiment is used a~ a drive tire on a tire-drlv~n crawler which 19 di~ferent f~om the tlre-drlven crawler i~ the second embodiment.
As shown in FIG. 6, the canvased tlre 30 which i9 a pneumatlc tlre has a single groove 3; deflned trans-versely cent~ally ln a radially ou~er ~urface thereof and extending ln the circumferential direction of the tire 30, the groove 31 havlng a substantially V-shaped cross section 15 spreadlr~g radially outwardly. ~s shown ln FIG. 7, a pi~ce o~ canva~ 39, which comprlses an elast~c~lly knltted cloth of o~ganlc fibers as of nylon, polyester, or the ll~ hav-ing a low coeff~clent of frlction/ lc dl~posed in the gr~ove 31. Speclfically, the piece of canvas 39 extends 20 from the bottom of the groove 31 ov~r slde wall surface~
thereof onto the radially outer sur~ce of ~he tlre 30.
P~lternatively, the plece of canva~ 39 may extend from the bottom o~ the groove 31 to at lea3t side wall ~urface~
thereo~ .
A crawler belt 32 which ls txalned around the canvased ~lre 30 comprises an endless elastlc body 33 made of an ~l~Qtlc material ~uch as rubber and a plurality of tensile-r~o~i3tant members 34 such a.~ steel cords or the li~e that are circumferentially embe~ded in the endleqs ~13.3~42 `elastlc body 33 over a cer~ain transverse dls~ance. A plu-rality of lu~ or blockg ~5 pro~ct radla11y outwardly from the outer clrcumferen~ial surface of the endles3 ela~tic body 33 for road contact, the lugs or bloc~ 35 be~n~
spaced at certaln lntervalc in the circ~mferenti~l dlrec-tlon. A plurality of guide teeth 36 pro~ect radlally ln-wardly from the lnner circumferentlal surface of the end-less elastic body 33 at a transver~ely central po~ltion thereon, the gulde teeth 36 being spaced at certain inter-vals in the cireumferentlal directlon. The guide teeth 36are fitted i~ the groove 31 with a sl~ht gap or clearance left therebetween. Each o~ the gulde teeth 36 ls covered ln ltS entire~y wlth a pieCe of Canva~ 37 made of organlc flb~rs as of nylon, polye~ter, or the like ha~n~ a low co-efficient of friction.
The canvased tire 30 accordlng to the third em-bodiment can ~lso be m~nufactured ln sub~tantlally ~he same manner as the canva~ed tlre 10 according to the flrst em-bodlment as ~hown in FIGS. 2 and 3. Speclflcally, a single rlng-shaped piece o~ canvas is attached ~o a transver~ely centr~l poxtion o~ a green tlre, a~d the green tlre is then :~
vulcanized by a t$re vulcanlzer thereby to bond the plece of ~anvas 39 to the tlre 3~ whlch ls formed.
When a tire-driven crawler with the canvased 25 tire 30 mounted as a dri~e tlre makes a sharp turn or runs on a slope, since the piece of canvas 39 with a low coeffi-cient of frlctlon 18 mounted in the groove 31, the canvased tire 30 ~llps well against the ~uld~ teeth 36 o~ the crawler belt 32, and i~ prevented ~rom b~lng e~811y dis-2~13~2 lodged from the crawler belt 32 . Speciflcally, the ten-derlcy of the canva~ed tire 30 to rlde on the guide teeth 36 1~ minimlzed. Any abra~ve wear on the dri~e tlre 30 and the .crawler ~elt 32 is also mlnimized because the piec~ Of canva3 39 ha~ a low coef~lcient of frlctlon. Accordlngly, the dur~blllty of ~he canva3ed tlre 30 i~ relatively high.
Furthermore~ the reslstance to ro~ation of the canvased tire 30 ~ low, ~o that the power from a power unit can ef-ficlently be tran~mltted to tha canvased tire 30. The pieco of canvas 37 coverlng each of the guide teeth 36 is effective to augment the above advantages of the canvased tlre 30, Duri~g operation of the tire-driven crawler with the canvased tire 30, the side wall3 of ~he ~roove 31 con-tact the guide teeth 36, applylng a lateral ~orce Fl ~see FIG. 6) to the gulde teeth 36 thereby to exert a mo~ent Fl x ~ to the crawler belt 32. However, ~ince a moment F2 x L
produced due to a reactive force F2 Applied from the road to the end~ of the lugs 35 of the crawler belt 32 1~ large, the-~e moments cancèl each o~her, preventing the crawler belt 32 from belng screwed wlth respect to the canvased tlre 30. Th~refore, the guide teeth 36 are not dislodged ~rom the groove 31. Thi~ fact, together wlth low fric-tio~al ~orces devel~ped between the canvased tlre 30 and the crawler belt 32, makes the canvaqed tire 30 hlghly re-~istant to accldental removal from the crawler belt 32.
Inasmuch ~s the outer circumferential surface of the can-vased tire 30 19 comparatively simple in con~igurat~on, l.e., wide, the po~ibility for any ~oreign m~tter such as -~ mud to find ~ts way lnto the groove 31 is small. The sub-qtantially V-shaped groove 31 can ea_ily dlscharge any for-elgn matter suoh as mud therefrom, and the di~charged for-eign ~atter can well be removed, wlthout gettlng clogged, from be~ween the guide teeth 36 ar~ spaced in the circum-ferential directlon. Consequently, the tension that i3 ap-plied to the crawler belt 32 during operation ls not ampll-fled by clogged forelgn ma~ter, with the result that the cr~wler belt 32 i~ less sub~ect to rupture.
The groove 31 may be dl placed ln position from the transverse central region of ~he outer circumferential surface o~ the tire 30, or a plurality of ~uch grooves may be def~ned ln the outer clrcumferentlal surface of the tlre 30. If the outer circumferentlal ~urface of the tire 30 has a plurallty of grooves, then gulde teeth 36 of the crawler belt 32 should preferably be arranged ln a stag-gered pattern to prevent foreign matter such as mud from being clogged between the tire 30 and the crawler belt 32.
The canvaQed tlre 3~ accordin~ to the third em-~odlment is used aQ a drive tlre among a plurality of tire~around which the crawler bel~ 32 1~ tralned. However, the canvased tlre 30 may ~e used as a driven tire or some or all of those tires. This also hold~ true for the can~ased tire 20 according to the second embodiment.
In each of the above embodiments, each piece o~
canvas co~prises a knitted clot~ of organic fibers as o~
nylon, ~or example. Particularly, since a piece of can~as whlch is made o~ nylon can be well bonded directly to ~
greon tl~e, a gre~n time wlth RUCh A plece o~ nylon canvas 2113~42 can be placed directly in the mold of a tire wlcanizer, and can be vulcan~ 2ed in the mold. The piece of nylon can-vas is flexlble enough to gtretch to the extent which i~
commensurate wlth the expansion of the tlre upon shavlng 5 when the t ire is vulcanl7ed . I~ the piece s~ nylon canvas is of a knitted structure, lt can istr~tch at least by 20 ~.
If the piece of canvas were made of Te~lon or the llke, it would not s~retch and would not be well bonded to rubber.
Therefore, the ' lre mold would requlre a reCeQs for receiv-lng the piece of canvas, a~d the worker would have to placethe plece of canva~ ln the recesi~ before a green tlre would be placed ln the tire mold.
In the first and second e~bodlments, the pieces of canvas are di~posed on the side walls. However, they may be posltloned anywhere in an axial position on the outer sur~ace~ o~ the tire. Spaclflcally, ~he plecea of canva~ may be pos~tioned ent~ rely, substantially entlrely, or partially on any one or any combinatlon o~ the tread, sho~lder~, slde walls, and beads o~ the tire.
While the pre ent lnventlon 18 applied to ~ r~-dial tire ln the flrst embodiment, the pr~nciples o~ the lnvention are also appllcable to a canvased bla~ tire.
Accordlng to the present invention, as descrl~ed above~ the canv~scd tire is highly durable, i.e~, hi~hly reslstant to cuts~ cracks, ~nd color ch~nges on outer sur-f~ces thereoi~, and has a low co~fficlent of rictlon. The canvased tlre is of a slmple structure, ~nd can be manufac-tured inexpensively, easi~y, and ~afely.
Although there have been descri~ed what are at ~39~2 present con3idered to be the ~referred emb~diments o~ the invention, lt wlll be understood that the invention may be embodied ln other speciflc form8 wlthout departlng from the esQential characterlstlcs thereo~. The pro~en~ e~bodiments S are there~ore to be considered ~n all rospects a~ lllustra-tive, and not restricti~e, Th~ scope of the inventlon i~
indlcated by the appended claims rather than by the forego-lng descrlption.
sAcKGRouND OF TH~ INV~N~IO~
Field of the In~ention:
The present lnventlon relateq to a canva~ed tlre havlng ~ide walls each lined with a piece of canva~ and a m~thod of manu~acturing such a canvased tire.
De~crlption ~f the Prior Art:
Tires for use on automobiles are required to have their slde wall outer surfaces highly durable, i.e., resistant to cuts, cracks, and c~lcr change~, and less frictlonal, ~.e., low in coe~lcient of frlction.
However, there have not been available, and hence there have been great demands for, lnexpenslve tlres 15 of slmple structure whlch can easily and safely be manufac-tured that meet the above requirements.
SUMMARY OF THE INV~NTION
It is therefore an ob~ect of the present lnven-tlon to provide a canvased tlre having slde wall outer sur-20 face~ which are resistant to cut~, cracks, and color ch~nges, and have a low coefflclent of frictlon for high durabillty, and a method of manu~acturing such a canvased tire.
According to the pre~en~ inventlon, there is pr~vlded a canvased tlre compri~lng a tlre h~vln~ a~ outersurface, and at lea-~t one ~tretchable piece of canvas made of organlc fiberq which ~9 diQposed ln an axial position on th~ outer Rurface and extending fully ~n a circumferential direction of the tire. The tixe has an outer clrc~mferen-2~1 39~2 - tla~ surface having a trans~erse cross section composed of a cen~ral tread, a pair of spaced shoulder~ extending re-spectlvely from oppo~lte ides of the central tread, a palr of apaced 9~ de walls extending respect1vely from the ~houl-ders, and a pa~r of ~pace~ bea~s dlsposed ~espectlvely onends o~ the side walls, the piece of canvas ~eing bonded to each of outer surface~ of the ~ide walls upon vulcanization of the tire. The organic fibers may be made o~ nylon whereby the piece of canvas ls re~iqtant to cuts, cracks, and color changes.
If the tire ~s used as a drive tire for use on a tlre-driven crawler, then pieces of canvas of orqanic fibers, particularly nylon canvas, are attached to outer surface portlon.~ of the tir~ wh~ch wlll engage a crawler lS belt trained around the tire when the tlre-driven crawler make~ a 8harp ~urn or runs on a slope. The pleces of can-vaq thu~ po~itioned are ~f~ective ~o reduce ~riction be-tween the tire and the crawler belt for t~ereby preventing the tire rrom being dislodged ~rom the crawler belt. Since the tlre and the crawler belt are held ln contact with each other under low frictional forces, any abrasive wear on the drlve tlre 19 reduced and its durab111ty is increased~
The canvased tire may ~e manufactured by ~ltting at least one stretchable ring-shaped pi~ce of canvas fitted over an outer circumferen~ial ~urface of a green tire ln a predeterm~ned axial poqition thereon, bo~ding the rlng-shaped piece of canvas to the green tlre, and there~ftèr vulCanlzlns the green tlre in the mold of a vulcanizer thereby to produce a canvaqed tlre with the plece of canvas 2~13~42 attached thereto.
T~ a~o~e and further ob~ect~, datails and ad-~antages of the present invention will beome appare~t from the followlng detailed de.~cription of preferred embodiments 5 thereof, when read in conjunctlon with th~ accom~anying drawlngQ .
BRIEF DESCRTPTION OF THE DRAWINGS
FIG. 1 is a fragmentary transverse cross-sec-tional view of a canvased tire, for ~se a3 a pneumatic ra-dial tlre on an automobile, according to a flrst embodl~entof the present i~vention;
FlG. 2 i~ a per~pect~ve view of a ringoshaped piece of canvas which can be used ln the canvased tlre shown ln FIG. l;
~IG. 3 18 a perspective view of a green tire over wh~ch ring-shaped pleceg of canvas as shown in FIG. 2 are fitted;
FIG. 4 is ~ fragmentary tranAverse cros~-sec-tional vlew of a canvased tlre, ~or use on a tire~drlven crawler, accordl~g to a -~eco~d embodlment of the pr~sent lnvention;
FI~. S ls a tran~verse cross-sectlonal vlew of tho canvased tire shown in FIG. 4 with a crawler belt tra~ned ~herearound;
FIG. 6 1~ a tran~verse cross-sectlonal ~iew of a canvased tlre, ~or use on a tlre-drlven crawler, accordlng to a thlrd embodlment of the present inven~ion, with a crawler belt tralned on the canvased tire; and FIG. 7 i~ an enlarged fragment2ry cross-sec-2~13~2 `' tlonal view of an encircled pOrtiQn VII o~ the assen~bly shown ln F~G. 6.
DETAII,ED D}~SCRIPTION OF THF. PREFERRED EMBO~IMENTS
A3 ~ho-~n ~n FIG. 1, a canva~ed tire 10, which is 5 ~uitable for use as a pneumatlc radial tlre on an automo-bile, according to a firgt embodiment of the present inven-tlon includes a tread 1 dlsposed on a radially outer wall thereof and extendlng transver~ely centrally across the ~a-dlally outer wall. The tire 10 also includes a pair of shoulders 2 posit~oned one on each slde of the tread 1, a pair of ~ide walls 3 extending respectively from opposlte sides of the shoulder~ 2 in spaced-apart relationshlp from each other, and a palr of beads 4 dispo~ed respectlvely on radially lnner ~nd~ of the side walls 3. Each of the beads 2 lncludes a bead core 5 e~bedded thereln. The tlre 10 in-cludes a carcass ply 6 embedded in and extending c~ntinu-ou~ly through the tread 1, the side walls 3, and the beads 4, and a re~nforcing belt layer 7 embedded ln the tread 1.
The tread 1, the shoulders 2, the side walls 3, and the 20 beads 4 are made of ~ubber. The tire 10 is o~ a toroldal Qhape as a whole. :~or the sake of brevity, only a rlght-hand croqs-sectional portion of the tire 10 is shown for lllustratlve purpo~e in FIG. 1.
Accordlng to the f~rst embodiment, the outer 25 surfac~ of each of the slds w311s 3 iS rendered durable by an elongate pieCe of canvas 9 whlch extends fully or ~ub-stantially fully over the outer surface a}ong itQ circum-ferential length. E;ac~ of the pieces o~ canva~ 9 on the re~pective outer 8urfaces of t}~e 3ide walls 3 com~rlses a . , . .,, .... . ., . , ., . .... , ..... . ., .. .. . ~
2113~2 ~ stretchably Xnit~ed cloth of organic fibers as of nylon or the llk~. The plece~ of canva-q 9 are effective ln m~klng the outer surfaces of the ~de wall~ 3 highly durable, i.e., highly reslstant to cuts, cracks, and colox changes.
Slnce the durabillty of the cide walls 3 of the tlre 10 19 lmproved ~imply by the pieces of canvas 10 ll~ed on the re-spec~,ive outer surface~ o~ the side walls 3, wlthout modl-fyin~ the rubber of the tlre 10, the side wall.~ 3 llned wlth the pieces of canvas 9 remaln relatively slmple in 10 structure. The plece~ of canvas 9 are inexpensive because they are knltted of organic flbers as of nylon.
The tire 10 shown in FIG. 1 1~ manu~actured a~
follow~: First, a ~heet of canvas is cut to a deQired elongate slze, and then the cut length of canvas ls rolled lnto.a rl~ 8hape 9 with ~ts long~tudinal opposlte ends ~ewn or stapled to each other, as shown in FIG. 2.
Thereafter, as shown in FIG. 3, the rln~-~haped piece of canvas 9 is f~tted over each axlal end of a green tlre 11 that has been formed by a tire ~ormin~ machlne, and bonded thereto by a ~olution of rubber ln gasollne or rubber Cement.
The green tlre 11 with the ring-shaped pieces of' can~a8 9 is then place~ in the mold of a tire vulcanlzer, and vulcanized at high te~perature under hlgh pre-~ure~
thereby forming the tlre 10 wlth the bonded pieces of can-~a~ 9.
Since the plece~ o~ canvas 9 are typically made of nylon flbers~ they can be bonded dlrectly to the g~e~
tire 10. It ls therefore no~ neces~ary ~or the worker to ~1 ~ 3~42 enter the mold of the ~lre vulcanl~er a~d ma~ually mount the pieces of canvas 9 in the mold. Conseque~tly, th~ tire iO can be manu~a~tured safely and ~aslly.
~he positions where the ring-shap~d pieces of canv~s 9 are f~ed to the green tlre 11 are determlned by comparing the green tire 11 and the tlre 10 that i3 to be formed from the green tlre 1l.
When 'che green tlre ll ls vulcanized by the tire vulcani2er, the pleces of canvas 9 are elongatéd ln the circumferentlal direction preferably by an elongation of up to 160 %. If tne piece~ of canvas g were elongated beyond 160 %, then the knitted fiber threads thereof would become too co~rse to achieve a desired degree of tlre durab~ llty.
The elongation is given as the ratlo of the circumferential 15 length LM of the outer circum~erentlal edge o* the pieces of canva~ 9 mounted on the tire 10, i.e., the circum~eren-ti81 length o~ the corresponding area of an inner ~urface of the mold in the tire vulcanizer, to the length LG of the cut length of canvas 9, the ratio belng expressed by 20 (I-M/LG) x 100.
When the pieces of canvas 9 are elongated in the tire wlcanizing process, their width ls reduced.
Therefore, when the lengths of canvas cut from the ~heet o~
canva8 should have a w~dth greater than the pieces of can-25 va~ 9 mounted on the tlre 10. Incidentally, if the pieceso canva-~ 9 are elongated ln the circum~erentlal dlrection by an elong~t~on of 160 %, then thei~ width is reduced by 20 %.
FTGS. 4 and S show a canvased tlre 20 accordlng - 6 ~
21~ 3~a~2 -_ to a second embodlment of l:he pre~nt inventlon. Th~ can-vased tire 20 ig preferably u~ed aq a drive ~ire on a tire-driven crawler ~uch as ~ crawler tractor or the like.
As Qhown 1~ FIG. ~, the canvase~ tire 20 which 5 ls a pneumatlc tire include~ a tread 21 and a pair o~
shoulders 22 dlspo8ed one on e~ch olde of the! tread 21 and havi~g a tapered shape including an uppex portlon (as viewed in FIG. 4) that s~oothly blends into t~e tread 21.
The canvased tire 20 according to the second embodlmçnt is desi~ned not only to make durable the outer surfaces of the side walls of the canvased tire 20, but also to lower the coefficleDt of frlctlon o~ the canvased tire 20.
More speciflcally, the canvased tlre 20 includes a pair of pleces of canvas 29 each disposed on and extend-lng over the outer surfaces of each lateral slde area ofthe troad 21, each shoulder 22, and an upper port~on (a~
viewed ~n FIG. 4) of each slde wall 23 which terminateS in a bead 24. Eac~ of the pieces of canvas 29 comprlses an elastically knitted cloth of organic fiber~ as of nylon or the llke. The ple.ce~ of canvas 29 thus positloned on the tir~ 20 are effecti.ve to reduce the coefflcient of frictlon for maklng the tlr~ 20 reslstan~ to belng dislodged from a crawl~r belt. ~er~tofor~, when a tlre-d~iven crawler ~kes a sharp turn or runs on a slope, the tlre tends to ride on a ~ide guide on the inner circumferential surface o~ the crawler belt, bringlng a portion of a shoulder of the t~ re lnto lntcnslve contact wlth a portion of the s~de guid~.
The tlre thus applles a lateral force to the crawler bolt, wh~ch ls skewed due to a bending moment impo~ed thereon, 39~2 possibly causing the tlre ~o be dislodged from the crawler belt. Accord4ng to the present inventlon, however, as shown ln FIG. 5, th~ canvased tl~e 20 is used as a driv~
tire on a tire-dri~en crawle:r, and th~ piece of can~as 2 5 are po~ltioned ln engag~ment wlth portlons o~ side guld~3 28' o~ a crawler belt 28, whlch portions wlll be held in lntens~ ve contact wlth the pleces o~ canvas 29 when the tire-driven crawle~ makes a -qharp turn or run~ on a ~lope.
The pieces of canvas 29 thus positioned serve to prevent the tlre 20 from rlding onto each of ~he ~ide guides 28' of the crawler belt 28. Since the pleces of canvas 29 provide a low coefficient of frlction, they prevent the tlre 20 and the crawler belt 28 from being abraded qulckly. Therefore, the piece~ of canvas 29 are effecti~e in lncreaslng the durability of the tire 20.
The canvased tlre 20 accordlng to the second em-bodiment can be manufactur~d ~n substantlally the ~ame man-ner as the canvaced tire 10 according to ~he irst embodi-ment as shown in FIGS . 2 and 3 . Specif lcally~ cut lengths of canva~ knltted o orqaniC fibers are rolled lnto a rlng Bhape wlth }o~gitud:Lnal end~ t~ereof belng sewn or fastened to each other. The rlng-shaped lengths of canva~ are fit-ted over re-~pective axial ends of a green tire, and ~onded thereto by a rubber sol~ent or a rubber cement. The green 25 tire wlth the bonded lengths of canvaS iS then vulcanized at high temperature under high pressure 4n the mold o~ a t're vulca~izer, thus forming the tire 20 wlth the bonded piece~ o~ canva~ 29. On the tire 20, each of the pleces of canvas 29 extend over and between the tre~d 21 and one o~
~ 3~42 `the 3ide walls 23, and is bonded to the outer surfaces of one of the shouLders 22, a portlon of the tread 21, and a portion of the 9~ de wall 23.
A canvaQed tlre 30 accordlng to a thlrd embodi-men~ of the present lnvention wlll now be de~cribed below with reference to FIGS. 6 and 7. The canva ed tire 30 ac-cordlng to ths thlrd embodiment is used a~ a drive tire on a tire-drlv~n crawler which 19 di~ferent f~om the tlre-drlven crawler i~ the second embodiment.
As shown in FIG. 6, the canvased tlre 30 which i9 a pneumatlc tlre has a single groove 3; deflned trans-versely cent~ally ln a radially ou~er ~urface thereof and extending ln the circumferential direction of the tire 30, the groove 31 havlng a substantially V-shaped cross section 15 spreadlr~g radially outwardly. ~s shown ln FIG. 7, a pi~ce o~ canva~ 39, which comprlses an elast~c~lly knltted cloth of o~ganlc fibers as of nylon, polyester, or the ll~ hav-ing a low coeff~clent of frlction/ lc dl~posed in the gr~ove 31. Speclfically, the piece of canvas 39 extends 20 from the bottom of the groove 31 ov~r slde wall surface~
thereof onto the radially outer sur~ce of ~he tlre 30.
P~lternatively, the plece of canva~ 39 may extend from the bottom o~ the groove 31 to at lea3t side wall ~urface~
thereo~ .
A crawler belt 32 which ls txalned around the canvased ~lre 30 comprises an endless elastlc body 33 made of an ~l~Qtlc material ~uch as rubber and a plurality of tensile-r~o~i3tant members 34 such a.~ steel cords or the li~e that are circumferentially embe~ded in the endleqs ~13.3~42 `elastlc body 33 over a cer~ain transverse dls~ance. A plu-rality of lu~ or blockg ~5 pro~ct radla11y outwardly from the outer clrcumferen~ial surface of the endles3 ela~tic body 33 for road contact, the lugs or bloc~ 35 be~n~
spaced at certaln lntervalc in the circ~mferenti~l dlrec-tlon. A plurality of guide teeth 36 pro~ect radlally ln-wardly from the lnner circumferentlal surface of the end-less elastic body 33 at a transver~ely central po~ltion thereon, the gulde teeth 36 being spaced at certain inter-vals in the cireumferentlal directlon. The guide teeth 36are fitted i~ the groove 31 with a sl~ht gap or clearance left therebetween. Each o~ the gulde teeth 36 ls covered ln ltS entire~y wlth a pieCe of Canva~ 37 made of organlc flb~rs as of nylon, polye~ter, or the like ha~n~ a low co-efficient of friction.
The canvased tire 30 accordlng to the third em-bodiment can ~lso be m~nufactured ln sub~tantlally ~he same manner as the canva~ed tlre 10 according to the flrst em-bodlment as ~hown in FIGS. 2 and 3. Speclflcally, a single rlng-shaped piece o~ canvas is attached ~o a transver~ely centr~l poxtion o~ a green tlre, a~d the green tlre is then :~
vulcanized by a t$re vulcanlzer thereby to bond the plece of ~anvas 39 to the tlre 3~ whlch ls formed.
When a tire-driven crawler with the canvased 25 tire 30 mounted as a dri~e tlre makes a sharp turn or runs on a slope, since the piece of canvas 39 with a low coeffi-cient of frlctlon 18 mounted in the groove 31, the canvased tire 30 ~llps well against the ~uld~ teeth 36 o~ the crawler belt 32, and i~ prevented ~rom b~lng e~811y dis-2~13~2 lodged from the crawler belt 32 . Speciflcally, the ten-derlcy of the canva~ed tire 30 to rlde on the guide teeth 36 1~ minimlzed. Any abra~ve wear on the dri~e tlre 30 and the .crawler ~elt 32 is also mlnimized because the piec~ Of canva3 39 ha~ a low coef~lcient of frlctlon. Accordlngly, the dur~blllty of ~he canva3ed tlre 30 i~ relatively high.
Furthermore~ the reslstance to ro~ation of the canvased tire 30 ~ low, ~o that the power from a power unit can ef-ficlently be tran~mltted to tha canvased tire 30. The pieco of canvas 37 coverlng each of the guide teeth 36 is effective to augment the above advantages of the canvased tlre 30, Duri~g operation of the tire-driven crawler with the canvased tire 30, the side wall3 of ~he ~roove 31 con-tact the guide teeth 36, applylng a lateral ~orce Fl ~see FIG. 6) to the gulde teeth 36 thereby to exert a mo~ent Fl x ~ to the crawler belt 32. However, ~ince a moment F2 x L
produced due to a reactive force F2 Applied from the road to the end~ of the lugs 35 of the crawler belt 32 1~ large, the-~e moments cancèl each o~her, preventing the crawler belt 32 from belng screwed wlth respect to the canvased tlre 30. Th~refore, the guide teeth 36 are not dislodged ~rom the groove 31. Thi~ fact, together wlth low fric-tio~al ~orces devel~ped between the canvased tlre 30 and the crawler belt 32, makes the canvaqed tire 30 hlghly re-~istant to accldental removal from the crawler belt 32.
Inasmuch ~s the outer circumferential surface of the can-vased tire 30 19 comparatively simple in con~igurat~on, l.e., wide, the po~ibility for any ~oreign m~tter such as -~ mud to find ~ts way lnto the groove 31 is small. The sub-qtantially V-shaped groove 31 can ea_ily dlscharge any for-elgn matter suoh as mud therefrom, and the di~charged for-eign ~atter can well be removed, wlthout gettlng clogged, from be~ween the guide teeth 36 ar~ spaced in the circum-ferential directlon. Consequently, the tension that i3 ap-plied to the crawler belt 32 during operation ls not ampll-fled by clogged forelgn ma~ter, with the result that the cr~wler belt 32 i~ less sub~ect to rupture.
The groove 31 may be dl placed ln position from the transverse central region of ~he outer circumferential surface o~ the tire 30, or a plurality of ~uch grooves may be def~ned ln the outer clrcumferentlal surface of the tlre 30. If the outer circumferentlal ~urface of the tire 30 has a plurallty of grooves, then gulde teeth 36 of the crawler belt 32 should preferably be arranged ln a stag-gered pattern to prevent foreign matter such as mud from being clogged between the tire 30 and the crawler belt 32.
The canvaQed tlre 3~ accordin~ to the third em-~odlment is used aQ a drive tlre among a plurality of tire~around which the crawler bel~ 32 1~ tralned. However, the canvased tlre 30 may ~e used as a driven tire or some or all of those tires. This also hold~ true for the can~ased tire 20 according to the second embodiment.
In each of the above embodiments, each piece o~
canvas co~prises a knitted clot~ of organic fibers as o~
nylon, ~or example. Particularly, since a piece of can~as whlch is made o~ nylon can be well bonded directly to ~
greon tl~e, a gre~n time wlth RUCh A plece o~ nylon canvas 2113~42 can be placed directly in the mold of a tire wlcanizer, and can be vulcan~ 2ed in the mold. The piece of nylon can-vas is flexlble enough to gtretch to the extent which i~
commensurate wlth the expansion of the tlre upon shavlng 5 when the t ire is vulcanl7ed . I~ the piece s~ nylon canvas is of a knitted structure, lt can istr~tch at least by 20 ~.
If the piece of canvas were made of Te~lon or the llke, it would not s~retch and would not be well bonded to rubber.
Therefore, the ' lre mold would requlre a reCeQs for receiv-lng the piece of canvas, a~d the worker would have to placethe plece of canva~ ln the recesi~ before a green tlre would be placed ln the tire mold.
In the first and second e~bodlments, the pieces of canvas are di~posed on the side walls. However, they may be posltloned anywhere in an axial position on the outer sur~ace~ o~ the tire. Spaclflcally, ~he plecea of canva~ may be pos~tioned ent~ rely, substantially entlrely, or partially on any one or any combinatlon o~ the tread, sho~lder~, slde walls, and beads o~ the tire.
While the pre ent lnventlon 18 applied to ~ r~-dial tire ln the flrst embodiment, the pr~nciples o~ the lnvention are also appllcable to a canvased bla~ tire.
Accordlng to the present invention, as descrl~ed above~ the canv~scd tire is highly durable, i.e~, hi~hly reslstant to cuts~ cracks, ~nd color ch~nges on outer sur-f~ces thereoi~, and has a low co~fficlent of rictlon. The canvased tlre is of a slmple structure, ~nd can be manufac-tured inexpensively, easi~y, and ~afely.
Although there have been descri~ed what are at ~39~2 present con3idered to be the ~referred emb~diments o~ the invention, lt wlll be understood that the invention may be embodied ln other speciflc form8 wlthout departlng from the esQential characterlstlcs thereo~. The pro~en~ e~bodiments S are there~ore to be considered ~n all rospects a~ lllustra-tive, and not restricti~e, Th~ scope of the inventlon i~
indlcated by the appended claims rather than by the forego-lng descrlption.
Claims (9)
1. A canvased tire comprising:
a tire having an outer surface; and at least one stretchable piece of canvas made of organic fibers which is disposed in an axial position on said outer surface and extending fully in a circumferential direction of said tire.
a tire having an outer surface; and at least one stretchable piece of canvas made of organic fibers which is disposed in an axial position on said outer surface and extending fully in a circumferential direction of said tire.
2. A canvased tire according to claim 1, wherein said tire has an outer circumferential surface having a transverse cross section composed of a central tread, a pair of spaced shoulders extending respectively from oppo-site sides of said central tread, a pair of spaced side walls extending respectively from said shoulders, and a pair of spaced beads disposed respectively on ends of said side walls, said piece of canvas being bonded to each of outer surfaces of said side walls upon vulcanization of said tire.
3. A canvased tire according to claim 1, wherein said organic fibers are made of nylon whereby said piece of canvas is resistant to cuts, cracks, and color changes.
4. A canvased tire according to claim 1, wherein said tire has an outer circumferential surface having a transverse cross section composed of a transversely central tread, a pair of spaced shoulders extending respectively from opposite sides of said central tread, a pair of spaced side walls extending respectively from said shoulders, and a pair of spaced beads disposed respectively on ends of said side walls, said piece of canvas extending over and between said tread and each of said side walls, and being bonded to outer surfaces of each of said shoulders, a por-tion of said tread, and a portion of said side wall upon vulcanization of said tire.
5. A canvased tire according to claim 1, wherein said tire comprise a drive tire for use on a tire-driven crawler, said tire having an outer circumferential surface having a single groove defined transversely centrally therein and extending in said circumferential direction, for receiving a plurality of guide teeth projecting trans-versely centrally from an inner circumferential surface of a crawler belt of the tire-driven crawler and spaced in a circumferential direction of the crawler belt, said piece of canvas being disposed in said groove and extending from a bottom thereof to at least side walls thereof.
6. A canvased tire according to claim 4 or 5, wherein said organic fibers are made of nylon whereby said piece of canvas has a low coefficient of friction.
7. A canvased tire according to claim 6, wherein each of said guide teeth is covered with a piece of canvas made of organic fibers.
8. A canvased tire according to claim 5, wherein said groove has a substantially V-shaped cross section spread radially outwardly.
9. A method of manufacturing a canvased tire, comprising the steps of:
fitting at least one stretchable ring-shaped piece of canvas fitted over an outer circumferential sur-face of a green tire in a predetermined axial position thereon;
bonding said ring-shaped piece of canvas to said green tire; and thereafter vulcanizing said green tire in the mold of a vulcanizer thereby to produce a canvased tire with said piece of canvas attached thereto.
fitting at least one stretchable ring-shaped piece of canvas fitted over an outer circumferential sur-face of a green tire in a predetermined axial position thereon;
bonding said ring-shaped piece of canvas to said green tire; and thereafter vulcanizing said green tire in the mold of a vulcanizer thereby to produce a canvased tire with said piece of canvas attached thereto.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5-241564 | 1993-09-28 | ||
| JP5241564A JPH0796873A (en) | 1993-09-28 | 1993-09-28 | Crawler running device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2113942A1 true CA2113942A1 (en) | 1995-03-29 |
Family
ID=17076219
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2113942 Abandoned CA2113942A1 (en) | 1993-09-28 | 1994-01-21 | Canvased tire and method of manufacturing same |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JPH0796873A (en) |
| CA (1) | CA2113942A1 (en) |
| DE (1) | DE4401732C2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2864470A1 (en) * | 2003-12-26 | 2005-07-01 | Michelin Soc Tech | PNEUMATIC COMPRISING A FABRIC OR BIELASTIC KNIT ON THE SURFACE. |
| JP4842087B2 (en) * | 2006-10-24 | 2011-12-21 | 株式会社ブリヂストン | Roller wheel of crawler type traveling body |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3703203A (en) * | 1970-06-12 | 1972-11-21 | Goodyear Tire & Rubber | Radial wire tire having improved sidewall cut resistance |
| GB1472745A (en) * | 1973-06-26 | 1977-05-04 | Dunlop Ltd | Pneumatic tyres |
| FR2336266A1 (en) * | 1975-12-23 | 1977-07-22 | Kleber Colombes | Aircraft pneumatic tyres - have tread strips at least 15 mm thick and less than half tyre width wide to deflect water on runways from jet engine intakes |
| DE4019316A1 (en) * | 1990-06-16 | 1991-12-19 | Continental Ag | Radial tyre with reinforced shoulder - has fabric inserted in skirt for additional protection against kerb damage |
| US5078192A (en) * | 1990-07-19 | 1992-01-07 | Rubber Applicators, Inc. | High flotation, low pressure radial tire |
| JP2664114B2 (en) * | 1992-01-10 | 1997-10-15 | 住友ゴム工業株式会社 | Pneumatic tire |
-
1993
- 1993-09-28 JP JP5241564A patent/JPH0796873A/en active Pending
-
1994
- 1994-01-21 DE DE19944401732 patent/DE4401732C2/en not_active Expired - Fee Related
- 1994-01-21 CA CA 2113942 patent/CA2113942A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| DE4401732C2 (en) | 1997-08-28 |
| DE4401732A1 (en) | 1995-03-30 |
| JPH0796873A (en) | 1995-04-11 |
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