[특허]Roller-type rock bit and bearing arrangement therefor

[미국특허] Roller-type rock bit and bearing arrangement therefor 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	E21B-009/08
출원번호	US-0848801 (1977-11-07)
발명자 / 주소	Dickerhoff Ronald P. (Louisville OH)
출원인 / 주소	The Timken Company (Canton OH 02)
인용정보	피인용 횟수 : 25 인용 특허 : 0

초록 ▼

A roller-type rock bit has a body which fits into a drill hole and is provided with inwardly directed spindles about which cone-shaped cutters revolve. Between each spindle and its cutter is a tapered roller bearing, a flat thrust bearing, and a sleeve-type radial bearing arranged in that order from the large end of the cutter. The raceways of the tapered roller bearing converge toward the small end of the cutter, and that bearing is unitized by a thrust rib located on the spindle opposite the small ends of the rollers and a rib ring which fits into the cutter opposite the large diameter ends of the rollers. Thus, a major portion of the radial load encountered in drilling is taken by the tapered roller bearing, as well as a significant portion of the thrust load, with both of those loads being transferred between the raceways generally transversely through the tapered rollers. Any thrust loading in the opposite direction is transferred between the rib ring and the thrust rib generally axially through the rollers. The rib ring further closes the end of the cutter and, together with a stream of air that flushes the interior of the cutter, prevents rock cuttings from entering the cutter and damaging the bearings.

대표청구항 ▼

In a roller type rock bit having a body adapted to rotate in a drill hole, the improvement comprising: a spindle projected from the body and having a tapered intermediate portion provided with a tapered surface that converges toward the body; a generally coneshaped cutter surrounding the spindle and having large and small ends and a cavity opening out of its large end, with the spindle projecting into the cavity from the large end of the cutter, the cutter further having external cutting elements arranged to bear against the end of the drill hole; a bearing cone fitted around the spindle and having a tapered bore, the taper of which matches the taper on the intermediate portion of the spindle, the cone further having an inner tapered raceway that is fixed in position with respect to the spindle; a bearing cup fitted into the cavity of the cutter and having an outer tapered raceway that is fixed in position with respect to the cutter; a single row of tapered rollers between the two raceways with the rollers having their tapered side surfaces against those raceways and their small diameter ends presented toward the small end of the cutter; a first rib fixed in position with respect to the spindle and projected outwardly from the tapered raceway thereon, the first rib being located opposite the small diameter ends of the tapered rollers; a backing ring fitted against the cup and being detachable from the cutter, the backing ring having a second thrust rib on it with that thrust rib being fixed in position with respect to the cutter and located adjacent to the tapered raceway on the cup, the second rib being located opposite the large diameter ends of the tapered rollers so that the rollers are captured between the two ribs, whereby a thrust load applied in the direction which urges the thrust ribs together is transferred through the ribs and generally axially through the rollers, while a thrust load applied in the direction which urges the ribs apart is transferred through the raceways and generally transversely through the rollers.

이 특허를 인용한 특허 (25) 인용/피인용 타임라인 분석

Fahrni, Jr., Glenn R.; Barnette, Wayne D., Adjustable antifriction bearing arrangement.
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Wiseman, Allen L., Adjustable bearing cup.
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Nagaraj, Mahavir; Marcus, Jeremy; Shotton, Vincent Wayne; Bhoite, Sameer, Air circulation ports in rotary rock bit journal bearing.
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Slaughter, Jr., Robert Harlan; Cariveau, Peter Thomas; Shotton, Vincent Wayne, Back reaming tool.
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Slaughter, Jr.,Robert H.; Cariveau,Peter T.; Shotton,Vincent W., Back reaming tool.
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Fahrni, Jr.,Glenn R.; Milam,David L.; Marcelli,Michael F.; Marks,Christopher S.; Obeng,Kofi P.; Russell,Scott D.; Roubanes,Byron; Stoffer,Gary A., Bearing arrangement for a vehicle differential.
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Tim Chu, Bearing assembly having an improved wear ring liner.
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Ippolito Rodolfo M. (Euless TX), Cooled journal bearing.
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Osborne, Jr., Andrew J., Cutter assembly for a raise boring reamer.
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Peterson, Gregory W., Earth bit having a pressure relief valve.
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Peterson, Gregory W., Earth bit having a wear ring.
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Peterson, Gregory W.; Podnieks, Anthony D.; Chu, Tim; Smith, Elisabeth; David, Janice, Earth bit with hub and thrust units.
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Konde, Parag; Likki, Srinivas; Larsen, James Layne; Terracina, Dwayne P.; Grebe, Andrew, Flow control through thrust bearing assembly.
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Vezirian Edward (P.O. Box 215 Beaumont CA 92223), Friction bearing and cone retention thrust system for a rock bit.
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Sato, Katsuhiko; Watanabe, Tomio, Guide roller.
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Rode, John E.; Strait, Sean E., Mounting ring.
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Rainey, Allan W.; Langford, James W., Percussion assisted rotary earth bit and method of operating the same.
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Rainey, Allan W.; Langford, James W., Percussion assisted rotary earth bit and method of operating the same.
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Crockett David P. (Mission Viejo CA) Erpenbeck Gerard P. (Costa Mesa CA) Hooper Michael E. (Mission Viejo CA), Precision roller bearing rock bits.
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Buske, Robert J.; Overstreet, James L.; Stefanik, Thomas M.; Anandampillai, Shyam; Bradshaw, Robert D., Roller cone disk with shaped compacts.
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Langford ; Jr. James W. (Red Oak TX), Roller drill bit having radial-thrust pilot bushing incorporating anti-galling material.
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Levefelt Bert G. (Sandviken SEX), Rotary drill bit.
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Peterson, Gregory Wayne; Gopalakrishna, Srinidhi Bangalore; Langford, James Wilson, Rotary drill bit.
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Pribbenow Walter A. (Ponca City OK), Thrust bearing for rock bits.
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Thomas Robert D. (Arlington TX), Thrust bearing for rock bits.
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IPC	Description
A	생활필수품
A62	인명구조; 소방(사다리 E06C)
A62B	인명구조용의 기구, 장치 또는 방법(특히 의료용에 사용되는 밸브 A61M 39/00; 특히 물에서 쓰이는 인명구조 장치 또는 방법 B63C 9/00; 잠수장비 B63C 11/00; 특히 항공기에 쓰는 것, 예. 낙하산, 투출좌석 B64D; 특히 광산에서 쓰이는 구조장치 E21F 11/00)
A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

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[미국특허] Roller-type rock bit and bearing arrangement therefor 원문보기