IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0182275
(2000-03-29)
|
우선권정보 |
EP-0830164 (2000-03-03) |
국제출원번호 |
PCT/IT00/00109
(2002-11-04)
|
§371/§102 date |
20021104
(20021104)
|
국제공개번호 |
WO01/64503
(2001-09-07)
|
발명자
/ 주소 |
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
17 인용 특허 :
4 |
초록
▼
A shaft/roller unit for tracked vehicles which has a long life and resistance to wear is formed by a shaft (54) which has a shoulder (55) in its central portion, perpendicular to its axis, and onto which two wholly hardened steel half-rollers (56, 57) are fitted, one on each side of the shoulder, wi
A shaft/roller unit for tracked vehicles which has a long life and resistance to wear is formed by a shaft (54) which has a shoulder (55) in its central portion, perpendicular to its axis, and onto which two wholly hardened steel half-rollers (56, 57) are fitted, one on each side of the shoulder, with the interposition of antifriction bushings (58, 59), the half-rollers grasping the shoulder (55) and, when they have been welded together along a mating contact and locating surface (60), forming a unitary roller which has a predetermined axial position on the shaft and can withstand considerable axial stresses.
대표청구항
▼
1. A shaft/roller unit for tracked vehicles including excavators and tractors, said shaft/roller unit comprising: a roller formed by a pair of axially drilled half-rollers hardened in their entirety, bringing their hardness to more than 50 Rockwell C, and welded together in the median plane of the r
1. A shaft/roller unit for tracked vehicles including excavators and tractors, said shaft/roller unit comprising: a roller formed by a pair of axially drilled half-rollers hardened in their entirety, bringing their hardness to more than 50 Rockwell C, and welded together in the median plane of the roller, perpendicular to its axis by means of flush welding with the addition of welded material, each of said half-rollers being fitted on a shaft with the sole interposition of a pair of antifriction bearings; the shaft having a shoulder in its central portion, for abutment by the antifriction bearings, and the shoulder having an outside diameter larger than the diameter of the shaft, wherein the axial hole in the half-rollers having a diameter smaller than the outside diameter of the shoulder, wherein the half-rollers have a first recess in the central portion of the roller for housing the shoulder and wherein end flanges of each antifriction bearing are directly in abutment with respective half-rollers on either side of the shoulder so as to enforce a predetermined axial position of the roller on the shaft, and providing for replaceability and exchange of the entire shaft/roller unit. 2. A unit according to claim 1, in which the half-rollers are made entirely of hardened steel. 3. A unit according to claim 1, in which the half-rollers have respective mating mutual locating surfaces. 4. A unit according to claim 1, in which the axially opposed faces of the roller have recesses for housing seals arranged flush with the peripheral surface of the shaft. 5. A method of forming a replaceable shaft/roller unit for tracked vehicles including excavators and tractors, comprising the following steps: separate forging of two steel half-rollers to be coupled with one another along a median plane of the roller, perpendicular to its axis, hardening of the two separate half-rollers in their entirety bringing their hardness to more than 50 Rockwell C, mechanical finishing of the two separate and hardened half-rollers, pressing of bushings directly into each of the two separate half-rollers, fitting of the two half-rollers each carrying one of said bushings onto a shaft, one on each side of a central shoulder of the shaft so that end flanges of each bushing is in direct abutment with respective half-rollers on either side of said shoulder, until mating coupling surfaces of the two half-rollers are brought into contact, and welding the two half-rollers along the mating surfaces, by means of flush welding with the addition of weld material. 6. A method according to claim 5, in which, after the forging stage, a further mechanical rough shaping stage is provided for removing shavings from the two separate half-rollers, forming a mating surface for the coupling of the two half-rollers. 7. A method according to or claim 6, in which the mating surface for the coupling of the two half-rollers comprises a cylindrical surface for the mutual location of the two half-rollers. 8. A unit according to claim 1, wherein each antifriction bearing comprises: a first, flanged cylindrical bush which is pressed into the axial hole in the respective half-roller and into the first recess; and by a second cylindrical bush which is pressed into the axial hole from the opposite side of the respective half-roller.
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