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    Rock drill with increased bearing life
    6.
    发明授权
    Rock drill with increased bearing life 失效
    具有增加轴承寿命的摇滚钻石

    公开(公告)号：US3620580A

    公开(公告)日：1971-11-16

    申请号：US3620580D

    申请日：1970-08-03

    Applicant: HUGHES TOOL CO

    Inventor： CUNNINGHAM ROBERT A

    IPC: E21B10/22 ,  F16C19/49 ,  F16C19/56 ,  F16C21/00 ,  F16C19/14

    CPC classification number: F16C21/00 ,  E21B10/22 ,  F16C19/49 ,  F16C2352/00

    Abstract: The invention is applicable to all types of rock drills in which a rolling cutter is rotatably mounted on a fixed shaft member with an interposed ball bearing, and is especially useful in the newer rock bits provided with a lubricant system and a highly effective seal. Heretofore the ball bearing has served as a means for transmitting loads from cutter to shaft, including both radial loads and axial loads. The inventor has modified the bearing structure in such a way that at least outward thrust loads and preferably radial loads as well no longer pass through the balls, i.e., from the raceway of the cone through the balls to the corresponding raceway on the bearing pin. This is accomplished by relieving or deepening either or both raceways, preferably in a nonuniform fashion so that the deepest relief is in the outboard portion of the bearing pin raceway or the inboard portion of the cone raceway, or both. One or more pairs of transversely extending friction bearing surfaces are disposed on the pair of members to absorb such thrust. The important effect of this improvement is the reduction or elimination of spalling of the ball raceways, thus eliminating metal particles that otherwise could find their way between the confronting surfaces of other bearing members, where they are likely to wreck havoc. The overall effect is to increase the life of the bearing, making it last as long as the cutting structure of the bit.

    Bearing seal
    8.
    发明授权
    Bearing seal 失效
    轴承密封

    公开(公告)号：US3137508A

    公开(公告)日：1964-06-16

    申请号：US8042461

    申请日：1961-01-03

    Applicant: HUGHES TOOL CO

    Inventor： CUNNINGHAM ROBERT A

    IPC: E21B10/22 ,  E21B10/25 ,  F16C33/78 ,  F16J15/34

    CPC classification number: E21B10/25 ,  F16C33/72 ,  F16C33/78 ,  F16C2352/00 ,  F16J15/3456

    Abstract: 949,857. Boring earth. HUGHES TOOL CO. May 25, 1961 [Jan. 3, 1961], No. 18978/61. Heading E1F. [Also in Division F2] An earth boring rotary drill bit, Fig. 1, comprises a conical cutter 7 rotatably mounted by means of ball and roller bearings 8, 9 on a pin 6 integral with a leg 4 of the bit head 2. The balls 9 are loaded in their raceway througha bore 11 which is plugged at 15 after insertion of the balls. Lubricant for the bearings is supplied from a reservoir 17 which communicates with the bore 11 by means of a passage 18. The lower end of the reservoir 17 is provided with a collapsible rubber diaphragm 20 which serves to transmit pressure from the drilling fluid to the lubricant 16. The upper end of the reservoir is closed by a cap 21 through which lubricant is introduced after removal of a plug 23. Sealing of the bearings is effected by an axially resilient seal ring 31, Fig. 2, which is a force fit on the pin 6 and which is compressed between annular faces 36, 37 respectively on the cutter 7 and the leg 4. The ring is provided with axial protuberances 34, 35, the area of contact of the protuberance 34 with the face 37 being greater than that of the protuberance 35 with the face 36 so that the area of the end face of the ring exposed to lubricant pressure is greater than that exposed to drilling fluid pressure. The difference in these areas helps to maintain sealing contact when the drilling fluid pressure exceeds the lubricant pressure which fluctuates as a result of axial and wobbling movements of the cutter in operation. A gap 29 between the ring 31 and the wall 45 of a counterforce in the cutter 7 permits radial movement of the cutter in operation.

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