CN107150726B - Rubber track - Google Patents
Rubber track Download PDFInfo
- Publication number
- CN107150726B CN107150726B CN201611216713.7A CN201611216713A CN107150726B CN 107150726 B CN107150726 B CN 107150726B CN 201611216713 A CN201611216713 A CN 201611216713A CN 107150726 B CN107150726 B CN 107150726B
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- Prior art keywords
- crawler
- tread layer
- base
- rubber
- circumferential direction
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- 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
- B62D55/18—Tracks
- B62D55/24—Tracks of continuously flexible type, e.g. rubber belts
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- 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
- B62D55/18—Tracks
- B62D55/24—Tracks of continuously flexible type, e.g. rubber belts
- B62D55/253—Tracks of continuously flexible type, e.g. rubber belts having elements interconnected by one or more cables or like elements
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Tires In General (AREA)
Abstract
The rubber crawler provided by the invention can achieve both crack resistance and crack growth resistance. A rubber crawler (1) is provided with: a crawler belt body (2) formed of rubber into an endless belt shape and provided with a plurality of lugs (5) protruding toward a crawler belt outer peripheral side (co); and a tensile member (4) which is embedded in the crawler body (2) and continuously extends in the crawler circumferential direction (a). The crawler belt body (2) has: a base tread layer (2a) that is disposed on the crawler outer circumferential side (co) of the tensile member (4) and that is continuous in the crawler circumferential direction (a); and a top tread layer (2b) that is disposed on the crawler outer circumferential side (co) of the base tread layer (2a) and is continuous in the crawler circumferential direction (a). The base tread layer (2a) is provided with base lugs (5a) that project into the interior of each lug (5).
Description
Technical Field
The present invention relates to a rubber crawler belt having both crack resistance and crack growth resistance.
Background
Conventionally, a rubber crawler belt is known, which includes: the crawler belt comprises a crawler belt body formed by rubber in an annular belt shape and a tensile body embedded in the crawler belt body. A plurality of lugs projecting toward the outer circumferential side of the crawler are formed on the crawler body in order to transmit driving force and traction force during traveling. The tensile member continuously extends in the circumferential direction of the track in order to maintain the tension of the track body.
The track body maintains its shape even when running by the tension of the tensile member. On the other hand, the lug located on the outer circumferential side of the crawler belt with respect to the tension body may be largely deformed by the ground contact during traveling. Due to this deformation, cracks may occur near the root of the lug. Further, there is a problem that the lug is repeatedly deformed during traveling, and such cracks grow, eventually leading to breakage of the lug.
For example, patent document 1 listed below proposes a rubber crawler in which a rubber core having high hardness is embedded in the interior of a lug. In the rubber crawler of patent document 1, in order to prevent the occurrence of peeling at the interface between the rubber core and the tensile member, the rubber core is embedded via the adhesive rubber layer, thereby suppressing the occurrence of cracks.
Patent document 1: japanese laid-open patent publication No. H09-249163
However, the rubber crawler of patent document 1 can suppress the occurrence of cracks in the vicinity of the root portion of the lug, but when cracks occur, the adhesive rubber layer and the rubber core are peeled off from each other, and the growth of cracks cannot be suppressed. In addition, even in the rubber crawler of patent document 1, when cracks occur in the rubber core itself, the growth thereof cannot be suppressed.
Disclosure of Invention
The present invention has been made in view of the above circumstances, and a main object thereof is to provide a rubber crawler which is basically configured such that a crawler body includes a base tread layer and a top tread layer and which has both crack resistance and crack growth resistance.
The rubber crawler of the present invention comprises: the track main part: the crawler belt body is formed into an annular belt shape by rubber, and is provided with a plurality of lugs protruding towards the outer periphery of the crawler belt; a tensile member that is embedded in the crawler body and continuously extends in a crawler circumferential direction, the crawler body including: a base tread layer disposed on a crawler outer circumferential side of the tensile member and continuous in a crawler circumferential direction; and a top tread layer disposed on an outer circumferential side of the track of the base tread layer and continuous in a track circumferential direction, the base tread layer including base lugs protruding inward of the lugs.
In the rubber crawler of the present invention, preferably, the top tread layer forms an outer circumferential surface of the crawler body.
In the rubber crawler of the present invention, it is preferable that the JIS-A hardness of the top tread layer is higher than the JIS-A hardness of the base tread layer.
In the rubber crawler of the present invention, it is preferable that the top tread layer has A JIS-A hardness of 60 to 80 degrees.
In the rubber crawler of the present invention, it is preferable that the base tread layer has A JIS-A hardness of 50 to 70 degrees.
In the rubber crawler according to the present invention, it is preferable that A difference between JIS-A hardness of the top tread layer and JIS-A hardness of the base tread layer is 4 degrees to 15 degrees.
In the rubber crawler of the present invention, preferably, the top tread layer contains natural rubber and the base tread layer contains synthetic rubber.
In the rubber crawler of the present invention, it is preferable that the thickness of the top tread layer is 0.4 to 1.2 times the thickness of the base tread layer.
In the rubber crawler of the present invention, it is preferable that the thicknesses of the top tread layer and the base tread layer are each 1.5mm or more.
In the rubber crawler of the present invention, the crawler body includes: a base tread layer that is disposed on an outer circumferential side of the crawler belt of the tensile member and is continuous in a crawler belt circumferential direction; and a top tread layer disposed on an outer circumferential side of the track of the base tread layer and continuous in a track circumferential direction. Such a crawler body can form a top tread layer from a rubber material having excellent crack resistance, and a base tread layer from a rubber material having excellent crack growth resistance, for example. The track body can suppress the occurrence of cracks with the top tread layer. Even when a crack occurs in the top tread layer, the crawler body can suppress the growth of the crack by the base tread layer.
The base tread layer further includes base lugs projecting inward of the lugs. Such a base tread layer can suppress the growth of cracks even when cracks are generated in the vicinity of the root of the lug, which is likely to generate cracks. The rubber crawler can suppress the breakage of the lugs, thereby improving the durability thereof.
Drawings
Fig. 1 is a perspective view showing one embodiment of a rubber crawler according to the present invention.
Fig. 2 is a plan view showing the rubber crawler from the outer circumferential side of the crawler.
Fig. 3 is a sectional view taken along line a-a of fig. 2.
Fig. 4 is a sectional view taken along line B-B of fig. 2.
Fig. 5 is a plan view showing a rubber crawler according to another embodiment of the present invention.
Description of reference numerals: 1 … rubber track; 2 … track body; 2a … base tread layer; 2b … top tread layer; 4 … stretch proofing body; 5 … lugs; 5a … base lug.
Detailed Description
Hereinafter, one embodiment of the present invention will be described with reference to the drawings.
Fig. 1 is a perspective view showing a rubber crawler 1 according to the present embodiment. As shown in fig. 1, the rubber crawler 1 of the present embodiment includes: a crawler body 2 formed of rubber in an endless belt shape, a plurality of mandrels 3 embedded in the crawler body 2, and a tensile member 4.
In the present specification, the crawler circumferential direction is the rotation direction of the rubber crawler 1, and corresponds to the direction indicated by reference character a in fig. 1. The track width direction is an axial direction of the drive wheel, the loose wheel, and the roller when the rubber crawler 1 is mounted on the vehicle, and corresponds to a direction indicated by reference numeral b in fig. 1. The track thickness direction is a direction orthogonal to the track circumferential direction and the track width direction, and corresponds to a direction indicated by reference numeral c in fig. 1. The inner side of the endless rubber crawler 1 in the crawler thickness direction c is a crawler inner circumferential side ci. The outer side of the endless rubber crawler 1 is a crawler outer circumferential side co.
Fig. 2 is a plan view of the rubber crawler 1 of the present embodiment shown from the crawler outer circumferential side co. Fig. 3 is a sectional view taken along line a-a of fig. 2, and fig. 4 is a sectional view taken along line B-B of fig. 2. As shown in fig. 1 to 4, the crawler body 2 of the present embodiment has a substantially constant width in the crawler width direction b. Preferably, a plurality of lugs 5 protruding toward the crawler outer circumferential side co are arranged on the crawler body 2 at substantially equal intervals in the crawler circumferential direction a.
The crawler body 2 has, for example, the following functions: when the rubber crawler 1 is mounted on a vehicle, the driving wheels, the loose wheels, the rollers (not shown), and the like are in contact with the inner circumferential surface, which is the surface of the inner circumferential side ci of the crawler, and the driving force of the vehicle can be transmitted to the ground contact surface via the lugs 5. The rubber crawler belt 1 having the crawler belt body 2 is less likely to damage a paved road even on the paved road, and is excellent in riding comfort.
The mandrel 3 is made of a hard metal material such as steel. The mandrel 3 is elongated as a whole and has a pair of projections 3a for guiding a driving wheel, a loose wheel, a roller, and the like, for example. The plug 3 is preferably embedded in the crawler body 2 with the longitudinal direction thereof directed in the crawler width direction b and at equal intervals in the crawler circumferential direction a. At this time, the pair of projections 3a of the plug 3 project from the crawler body 2 toward the crawler inner circumferential side ci. Such a mandrel bar 3 also has a function of holding the shape of the crawler body 2 and transmitting the driving force from the driving wheel more reliably.
The tension member 4 is formed by arranging a plurality of tension cords, such as steel cords, extending in the track circumferential direction a in parallel in the track width direction b. The tensile member 4 is embedded in the track body 2 at a position closer to the track outer circumferential side co than the mandrel bar 3 and closer to the track inner circumferential side ci than the lugs 5 in the track thickness direction c, for example. The tension member 4 of the present embodiment is wound around the crawler circumferential direction a and continuously extends along the crawler circumferential direction a. Such a tensile member 4 can maintain the tension of the rubber crawler 1, thereby preventing the rubber crawler 1 from slipping off the wheel during running.
The lug 5 is, for example, substantially trapezoidal pyramid-shaped extending in the track width direction b. Such lugs 5 are capable of transmitting large driving forces. In addition, since the lug 5 has a large length near the root, the mechanical strength can be improved.
As shown in fig. 1, 3, and 4, the crawler body 2 of the present embodiment includes: a base tread layer 2a disposed on the crawler outer circumferential side co of the tensile member 4, and a top tread layer 2b disposed on the crawler outer circumferential side co of the base tread layer 2 a.
The crawler body 2 can be formed with the top tread layer 2b made of a rubber material having excellent crack resistance, and the base tread layer 2a made of a rubber material having excellent crack growth resistance, for example. The crawler body 2 can suppress the occurrence of cracks with the top tread layer 2 b. Even when a crack occurs in the top tread layer 2b, the crawler body 2 can suppress the growth of the crack by the base tread layer 2 a.
The base tread layer 2a of the present embodiment continuously extends in the track circumferential direction a. The base tread layer 2a preferably contains synthetic rubber. The compounding ratio of the synthetic rubber in the rubber material of the base tread layer 2a is preferably 30 mass% or more. Such a base tread layer 2a is excellent in crack growth resistance. Further, although the base tread layer 2a of the present embodiment does not reach the ends in the track width direction b, the base tread layer 2a may reach the ends in the track width direction b.
The rubber material of the base tread layer 2A preferably has A JIS-A hardness of 50 to 70 degrees. If the JIS-A hardness of the rubber material of the base tread layer 2A is less than 50 degrees, the mechanical strength is insufficient, and there is A possibility that the deformation amount of the lug 5 at the time of ground contact during running increases. Further, if the JIS-A hardness of the rubber material of the base tread layer 2A is more than 70 degrees, the crack growth resistance may not be improved. The JIS-A hardness is A hardness measured by A type A durometer in an environment of 23 ℃ based on the JIS-K6253 specification.
The top tread layer 2b of the present embodiment continuously extends in the track circumferential direction a. In the present embodiment, the top tread layer 2b forms the outer circumferential surface of the crawler body 2. The top tread layer 2b preferably contains natural rubber. The blending ratio of the natural rubber in the rubber material of the top tread layer 2b is preferably 60 mass% or less. Such a top tread layer 2b is excellent in crack resistance.
The rubber material of the top tread layer 2b preferably has A JIS-A hardness of 60 to 80 degrees. If the JIS-A hardness of the rubber material of the top tread layer 2b is less than 60 degrees, the crack resistance may not be improved. Further, if the JIS-A hardness of the rubber material of the top tread layer 2b is more than 80 degrees, the bending property may be lowered to deteriorate the fuel performance during running, and the high hardness may deteriorate the riding comfort on the paved road.
The JIS-A hardness of the rubber material of the top tread layer 2b is preferably higher than that of the rubber material of the base tread layer 2A. The crawler body 2 having the top tread layer 2b and the base tread layer 2a can suppress the occurrence of cracks by the top tread layer 2 b. Even when a crack occurs in the top tread layer 2b, the crawler body 2 can suppress the growth of the crack by the base tread layer 2 a.
The difference between the JIS-A hardness of the rubber material of the top tread layer 2b and the JIS-A hardness of the rubber material of the base tread layer 2A is preferably 4 to 15 degrees. If the difference is less than 4 degrees, the difference in the characteristics of the top tread layer 2b and the base tread layer 2a becomes small, and there is a possibility that both the crack resistance and the crack growth resistance cannot be achieved. If the difference is larger than 15 degrees, the difference in the characteristics of the top tread layer 2b and the base tread layer 2a is increased, and there is a possibility that the top tread layer 2b and the base tread layer 2a may be peeled off at the boundary surface thereof.
The base tread layer 2a of the present embodiment includes: a base lug 5a projecting inward of each lug 5, and a base band 6a to which each base lug 5a is attached. The thickness t1 of the base tape 6a is preferably 1.5mm or more. The thickness t1 of the base tape 6a is preferably substantially constant.
In addition, the maximum thickness t2 of the base tab 5a is greater than the thickness t1 of the base strip 6 a. That is, the thickness of the base tread layer 2a is preferably 1.5mm or more over the entire circumference of the crawler circumferential direction a. Even when a crack is generated in the vicinity of the root of the lug 5, which is likely to generate a crack, the base tread layer 2a can suppress the growth thereof. Therefore, the rubber crawler 1 suppresses the breakage of the lugs 5, and the durability thereof can be improved.
The base lugs 5a of the present embodiment are formed integrally with the base band 6a continuous in the crawler circumferential direction a. The base lugs 5a are less likely to break from the vicinity of the roots, thereby improving the strength of the base tread layer 2 a. The durability of the rubber crawler 1 is further improved.
The top tread layer 2b of the present embodiment includes: a tread lug 5b constituting the outer surface of each lug 5, and a tread band 6b connecting each tread lug 5 b. The thickness t3 of the tread band 6b is preferably 1.5mm or more. In addition, the maximum thickness t4 of the tread lug 5b is greater than the thickness t3 of the tread band 6 b. That is, the thickness of the top tread layer 2b is preferably 1.5mm or more over the entire circumference of the crawler circumferential direction a. The tread lugs 5b are preferably integrally formed with a tread band 6b continuous in the track circumferential direction a.
The thickness t3 of the tread band 6b is preferably 0.4 to 1.2 times the thickness t1 of the base band 6 a. The maximum thickness t4 of the tread lug 5b is preferably 0.4 to 1.2 times the maximum thickness t2 of the base lug 5 a. That is, the thickness of the top tread layer 2b is preferably 0.4 to 1.2 times the thickness of the base tread layer 2a over the entire circumference of the crawler circumferential direction a. The crawler body 2 having the top tread layer 2b and the base tread layer 2a can improve the crack resistance and the crack growth resistance in a well-balanced manner.
Fig. 5 is a plan view showing a rubber crawler 11 according to another embodiment of the present invention. As shown in fig. 5, the rubber crawler 11 of the present embodiment includes: a crawler body 12 formed of rubber in an endless belt shape, a plurality of mandrels 13 embedded in the crawler body 12, and a tensile member (not shown).
The crawler body 12 is preferably provided with a plurality of lugs 15 arranged substantially at equal intervals in the crawler circumferential direction a. The lug 15 includes, for example: a first lug 15A on one side and a second lug 15B on the other side in the track width direction B. The crawler body 12 of this embodiment also includes, in the same manner as the above-described embodiment: a base tread layer (not shown) having base lugs (not shown) and a top tread layer (not shown) disposed on the outer surface thereof.
Although the first lugs 15A and the second lugs 15B are arranged at positions shifted in the track circumferential direction a in this embodiment, the positions in the track circumferential direction a may be the same. In addition, the same structure as that of the above-described embodiment can be adopted for the internal structure of other various known lug patterns.
While the above description has been made of a particularly preferred embodiment of the present invention, the present invention is not limited to the above embodiment, and can be modified into various embodiments.
Claims (8)
1. A rubber crawler belt is provided with: the track main part: the crawler belt body is formed into an annular belt shape by rubber, and is provided with a plurality of lugs protruding towards the outer periphery of the crawler belt; a plurality of mandrels embedded in the crawler body; a tensile member embedded in the crawler body and continuously extending in a circumferential direction of the crawler, characterized in that,
the crawler main body has: a base tread layer disposed on a crawler outer circumferential side of the tensile member and continuous in a crawler circumferential direction; a top tread layer disposed on a crawler circumferential side of the base tread layer and continuous in a crawler circumferential direction,
the base tread layer includes: a base lug projecting inwardly of each lug and a base strip joining each of the base lugs,
the base lugs are formed integrally with the base belt that is continuous in the circumferential direction of the track,
the top tread layer has A JIS-A hardness higher than that of the base tread layer,
a width-directional length of the crawler belt of the base tread layer is greater than a width-directional length of the crawler belt of the mandrel.
2. The rubber track of claim 1,
the top tread layer forms an outer circumferential surface of the track body.
3. The rubber crawler according to claim 1 or 2,
the top tread layer has A JIS-A hardness of 60 to 80 degrees.
4. The rubber crawler according to claim 1 or 2,
the base tread layer has A JIS-A hardness of 50 to 70 degrees.
5. The rubber crawler according to claim 1 or 2,
the difference between the JIS-A hardness of the top tread layer and the JIS-A hardness of the base tread layer is 4 to 15 degrees.
6. The rubber crawler according to claim 1 or 2,
the top tread layer contains a natural rubber,
the base tread layer contains a synthetic rubber.
7. The rubber crawler according to claim 1 or 2,
the thickness of the top tread layer is 0.4 to 1.2 times the thickness of the base tread layer.
8. The rubber crawler according to claim 1 or 2,
the thicknesses of the top tread layer and the base tread layer are respectively more than 1.5 mm.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2016-039802 | 2016-03-02 | ||
| JP2016039802A JP6763152B2 (en) | 2016-03-02 | 2016-03-02 | Rubber crawler |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107150726A CN107150726A (en) | 2017-09-12 |
| CN107150726B true CN107150726B (en) | 2021-02-02 |
Family
ID=59791929
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611216713.7A Active CN107150726B (en) | 2016-03-02 | 2016-12-26 | Rubber track |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP6763152B2 (en) |
| CN (1) | CN107150726B (en) |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3734876B2 (en) * | 1996-03-18 | 2006-01-11 | 住友ゴム工業株式会社 | Elastic crawler |
| JP3805974B2 (en) * | 2000-12-01 | 2006-08-09 | 住友ゴム工業株式会社 | Elastic crawler |
| JP4282553B2 (en) * | 2004-06-02 | 2009-06-24 | 住友ゴム工業株式会社 | Elastic crawler |
| JP2009061821A (en) * | 2007-09-04 | 2009-03-26 | Bridgestone Corp | Manufacturing method of rubber crawler |
| KR101123486B1 (en) * | 2010-01-26 | 2012-03-23 | 동일고무벨트주식회사 | Rubber crawler having with metal core for anti runway wheel and improved endurance property |
| WO2012137887A1 (en) * | 2011-04-05 | 2012-10-11 | 株式会社ブリヂストン | Crawler travel device and elastic crawler |
| CN204021040U (en) * | 2014-08-30 | 2014-12-17 | 浙江三门维艾尔工业有限公司 | Anodontia rubber belt track |
| CN204775569U (en) * | 2015-07-19 | 2015-11-18 | 江西金利隆橡胶履带有限公司 | Strengthening rib type rubber track |
-
2016
- 2016-03-02 JP JP2016039802A patent/JP6763152B2/en active Active
- 2016-12-26 CN CN201611216713.7A patent/CN107150726B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| JP6763152B2 (en) | 2020-09-30 |
| JP2017154612A (en) | 2017-09-07 |
| CN107150726A (en) | 2017-09-12 |
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