IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0415628
(1995-04-03)
|
우선권정보 |
IT-0000280 U (1994-04-15) |
발명자
/ 주소 |
- Bertoni Giovanni (Ferrara ITX)
|
출원인 / 주소 |
- Berco, S.p.A. (Copparo ITX 03)
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인용정보 |
피인용 횟수 :
4 인용 특허 :
3 |
초록
▼
A crawler link used in an endless track vehicle having monolithic shoe portions made of iron and an elastomer. The link comprises a shoe portion, a bush, rails and hinge eyelets, and is cast in one piece to avoid the disassembling of components during replacement. An elastomer portion, with tapered
A crawler link used in an endless track vehicle having monolithic shoe portions made of iron and an elastomer. The link comprises a shoe portion, a bush, rails and hinge eyelets, and is cast in one piece to avoid the disassembling of components during replacement. An elastomer portion, with tapered surfaces for efficient gripping and traction, is directly applied by vulcanization to the lower surface of the shoe portion of the link.
대표청구항
▼
A link for a crawler track, particularly applicable to small-capacity tracked machines, said link comprising a metal piece formed entirely by casting, and an elastomer portion applied to the said metal piece, in which the metal piece formed entirely by casting comprises a shoe portion, transverse ba
A link for a crawler track, particularly applicable to small-capacity tracked machines, said link comprising a metal piece formed entirely by casting, and an elastomer portion applied to the said metal piece, in which the metal piece formed entirely by casting comprises a shoe portion, transverse bars formed on said shoe portion, a bush portion, and a pair of rail portions having first ends in one piece with the bush portion and second ends each defining a hinge eyelet portion, said hinge eyelet portions having facing inner surfaces, said inner surfaces spaced apart by a distance slightly greater than the axial length of the bush portion to enable links to be hinge-connected together by a respective hinge pin passing through the bush portion of one link and the hinge eyelet portions for connecting said links, said rail portions defining slide surfaces parallel to and opposite the shoe portion, said shoe portion having a rear end portion with a lower surface, said bush portion defining a cylindrical outer surface on which the teeth of the drive wheel act in accordance with an involute profile, the elastomer portion being applied directly by vulcanization to at least one part of the lower surface of the shoe portion, said lower surface to which the elastomer portion is applied having a roughness produced by sandblasting, and between the elastomer portion and said lower surface of the shoe portion there is a thermoplastic polymer layer with softening point of 150 degrees C. and a layer of natural rubber between 0.5 and 1.0 mm thick vulcanizable at about 160 degrees C. for about 30 minutes, and the material of the elastomer portion is a mixture of natural rubber and synthetic rubber, the content of the latter being a maximum of 15%, and wherein after vulcanization the elastomer portion can attain a minimum ultimate tensile strength of 22 daN/cm2, a hardness of about 70 Shore, a minimum elongation of 460%, a minimum tear resistance in accordance with ASTM D624 of 150 daN/cm2, an abrasion resistance in accordance with DIN 535161 of 90 units maximum, and a density of 1.15 kg/dm3, wherein said elastomer portion is symmetrical about an axis, and coincides with a track advancement axis, said elastomer portion being formed from two substantially identical first half-portions and from two identical second half-portions, said first half-portions having a thickness less than that of said second half-portions which is sufficient to cover said transverse bars of the shoe portion, each of said first half-portions being separated from said adjacent second half-portions along an arched profile, said arched profile being concave to said first portions, said track link having a slot positioned within proximity of a center line of said track link, said slot having its major axis coincident with said track advancement axis, said second half-portions being positioned on opposite sides of said slot and being connected together by a thin layer, said first half-portions and said second half-portions both having bevelled edges, and do not cover the lower surface of the rear end part of the shoe portion which, when the track is assembled, is intended to overlie the link which precedes it in the direction of normal track advancement, said metal piece being made of a cast iron having the following composition: C 3.5 min; Si 2.5; Mn 0.31; S 0.014; P 0.029; Ni 0.5; Mg 0.04; Mo 0.20, with the following mechanical characteristics: R. 1150 N/mm2; Hrc 40; Elongation 10%, wherein each link is connected to other similar links to form a crawler track.
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