摘要:
A driving apparatus is used for simultaneously tensioning the jackbolts of a multi-jackbolt tensioner and includes a central drive gear mounted for rotation along a central drive gear axis. An annular array of spindles surrounds the central drive gear, each spindle independently mounted for rotation, with one spindle associated with one of the jackbolts. A socket on one spindle end is configured to receive one of the jackbolts. A spindle gear surrounds each spindle and is configured to rotate the spindle. The spindle gear is meshed with the central drive gear to be rotated by the central drive gear, wherein at least one spindle gear is offset along the central drive gear axis from at least another spindle gear. A slip clutch is positioned radially between each spindle gear and the associated spindle, wherein rotation of the jackbolts is up to a torque setting of the slip clutch during tensioning.
摘要:
A tensioning device for a thread end portion of a bolt has a cylindrical housing and a piston, moveable in longitudinal direction therein and connectable to a hydraulic supply. An interchangeable sleeve extends centrally through the piston. At its end it has an internal thread with engagement length to be screwed onto the thread end portion. The sleeve has a radially expanded portion carried axially by a carrier face of the piston. In order to prevent the sleeve from prematurely contacting the threaded bolt when mounting the bolt tensioning cylinder and prevent damage to the threads, the sleeve is moveable longitudinally relative to the piston. The longitudinal sleeve travel is defined by the carrier face as first longitudinal stop and by a second longitudinal stop. The longitudinal sleeve travel is at least equal to, preferably greater, than the engagement length of the internal thread of the sleeve.
摘要:
A system for tensioning a stud that projects from a structural member is provided. The system comprises a safety guard including a guard housing and a hydraulic interlock assembly, and a tensioning system coupled with a first end of the stud. The guard housing surrounds at least a portion of the tensioning system and is coupled with a second end of the stud and the hydraulic interlock assembly. The hydraulic interlock assembly is coupled with the guard housing and the tensioning system. The hydraulic interlock assembly provides fluid communication of a hydraulic fluid from a hydraulic source to the tensioning system to tension the stud.
摘要:
Methods and apparatus for preloading a bearing are provided. These methods and apparatus include preload monitoring devices whereby the mechanic can accurately monitor and regulate the preload on a bearing or bearing assembly. Aspects of the invention may also be used to adjust the endplay on a bearing or a bearing assembly. In one aspect, the preload on the bearing is transmitted through a housing having a fluid pressure that can be detected and monitored. An apparatus for precisely rotating a nut and a tool for precisely rotating a nut are also provided. A bearing retaining nut arrangement that permits the loading or evaluating of a bearing inner race is also provided. The bearing retaining nut arrangement includes a first load-setting nut, a lock washer, and a second jam nut that secures the arrangement to a shaft.
摘要:
An axle nut for preloading a bearing is provided. The axle nut may be used to apply and monitor preload on a bearing or bearing assembly. The axle nut includes a cylindrical body having a first end, a second end having a face adapted to bear against a surface, a longitudinal axis, and an outer surface engagable by a tool; a threaded through-hole directed substantially along the longitudinal axis of the cylindrical body; and at least one recess in the face of the second end of the cylindrical body, the at least one recess adapted to expose at least a portion of the surface the face bears against. The first end of the axle may comprise a nut locking mechanism, for example, the nut locking mechanism may include a counter bore having a plurality of internal projections, such as, gear or spline teeth.
摘要:
Hydraulically assisted fastener (10) comprises a body (11) with a central bore (12) to engage a connector element (20) and with an annular recess (14) opening outwards to an end surface (15). Annular thrust member (17) fits into and seals the recess (14). Charging medium (50) is injected under pressure into annular chamber (30) defined by recess (14) and member (17) and moves body (11) relative to member (17) to tension element (20). Medium (50) sets in chamber (30) to maintain the tension in element (20). Element (20) may be a bolt or stud, body (11) can be a nut and member (17) can be a plan washer. Medium (50) can be a curable viscous paste, a suspended solid in a self-setting compound or a particulate solid which behaves as a fluid. Suitable materials include graphite, and lead, copper or steel balls.
摘要:
Methods and apparatus for preloading a bearing are provided. These methods and apparatus include preload monitoring devices whereby the mechanic can accurately monitor and regulate the preload on a bearing or bearing assembly. Aspects of the invention may also be used to adjust the endplay on a bearing or a bearing assembly. In one aspect, the preload on the bearing is transmitted through a housing having a fluid pressure that can be detected and monitored. An apparatus for precisely rotating a nut and a tool for precisely rotating a nut are also provided. A bearing retaining nut arrangement that permits the loading or evaluating of a bearing inner race is also provided. The bearing retaining nut arrangement includes a first load-setting nut, a lock washer, and a second jam nut that secures the arrangement to a shaft.
摘要:
A clamping device includes a base body defining at least a portion of at least one pressure chamber, which has at least one opening oriented in a direction of action. A membrane is connected with the base body in a pressure-tight manner and seals the at least one opening in the direction of action. The membrane defines a first side wall section of the pressure chamber. A movable second side wall section partially delimits the pressure chamber and a constant amount of pressure fluid is sealed in the pressure chamber. At least one mechanical actuator displaces or deforms the second side wall section in order to cause the membrane to outwardly bulge.
摘要:
A sealing device for a hydraulic assembly wherein hydraulic fluid is contained in working chamber (53) formed between body (52) and thrust member (51) of the assembly. The device comprises annular seal (63) with opposed sealing faces which are urged into sealing engagement between body (52) and thrust member (51) which have convergent sealing faces. The device may also have a pressure relief valve (100) tapped into the over-stroke end of chamber (53) to protect seal (63) from over-stroke damage comprising porous body (101) which allows fluid to bleed from chamber (53) and allows seal (63) to pass the tapping point without obstruction.
摘要:
Methods and apparatus for preloading a bearing are provided. These methods and apparatus include preload monitoring procedures and devices whereby a mechanic can accurately monitor and regulate the preload on a bearing or bearing assembly. Aspects of the invention may also be used to adjust the endplay on a bearing or a bearing assembly. The methods and apparatus allow the mechanic to apply and/or verify a preload on the bearing, for example, to apply and/or verify a preferred “3 thousandths” preload, as is desired in the industry. In one aspect, the preload on the bearing is transmitted through a housing having a fluid pressure that can be detected and monitored.