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Showing papers on "Slewing bearing published in 2002"


Patent
28 Jan 2002
TL;DR: In this article, an inner ring and outer ring arranged so as to surround the inner ring, and multiple spacer 11 having recesses in a central portion of both sides alternately arranged and housed in the circular rolling body housing space formed between both rings, are presented.
Abstract: PROBLEM TO BE SOLVED: To provide a slewing bearing capable of increasing the number of rolling bodies more than a prior art, which are capable of housing in a rolling body housing space, even though a spacer made of plastic grease is used therein SOLUTION: The slewing bearing used for a construction machine comprises an inner ring and outer ring arranged so as to surround the inner ring, and has multiple rolling bodies 3 and multiple spacer 11 having recesses in a central portion of both sides alternately arranged and housed in the circular rolling body housing space formed between both rings The bearing gyrates a slewing body arranged between a base and the slewing body gyrating over the base while supporting the gyrating body The spacer 11 is made of plastic grease 20, and a load receiving member 21 made of a material such as a synthetic resin or the like which is less prone to be crushed than the plastic grease 20 is arranged on a central portion of the space 11 The load receiving member 21 is designed to receive the load at a stage before in which the plastic grease 20 is deformed beyond its elastic limit by the load from the rolling body 3 COPYRIGHT: (C)2003,JPO

9 citations


Patent
06 Feb 2002
TL;DR: In this article, an annular sliding seal was installed on an upper portion of the grease bath internal cylinder 81 so as to enclose the through hole 11a and abut on a lower face of the slewing frame 11.
Abstract: PROBLEM TO BE SOLVED: To provide a grease bath for a slewing mechanism, which can positively prevent infiltration of water thereinto. SOLUTION: A swirling bearing 6 has its inner lace 7 attached to an upper face of a center frame 30. A slewing frame 11 is attached to an upper face of an outer lace 8 of the slewing bearing 6, and a grease bath internal cylinder 81 is erected on the upper face of the center frame 30 at a location outside a through hole 11a of the slewing frame 11 and inside the inner lace 7. Then, an annular sliding seal 82 is installed on an upper portion of the grease bath internal cylinder 81 so as to enclose the through hole 11a and abut on a lower face of the slewing frame 11, and grease 49 is filled into the grease bath 48 formed between the grease bath internal cylinder 81 and the outer lace 8. Further, a water infiltration preventing means 41, 42, 43, or 44 for preventing infiltration of water having flown from the through hole 11a to the lower face of the slewing frame 11, into the grease bath 48, is arranged between the sliding seal 82 and the through hole 11a.

1 citations


Book ChapterDOI
01 Jan 2002
TL;DR: In this paper, a simple and efficient numerical model specially developed for the sizing of these connections is presented, which takes into account non-linear stiffness distribution in the assembly and in particular the effect of the load application height.
Abstract: slewing bearings are bearings of very large diameter used for cranes, radar dishes, tunnel boring machines, etc. The two bearing rings are clamped to the stnucture by preloaded high-strength screws or bolts. The connection is like a thick and narrow cylindrical flange, which includes a large number of fasteners. It is subjected to extreme loading, which is variable in time. Given the low fatigue resistance of threaded elements, they must be sized with a great accuracy. This article presents a simple and efficient numerical model specially developed for the sizing of these connections. The originality of the modelling process lies in the use of a hybrid finite element. This element has the general behaviour of a ring (cylindrical shell element), except for the axial direction where its stiffnness is the local stiffness that governs the behaviour of the bolted assembly. By discretising the ring in several elements, this formulation can take into account non-linear stiffness distribution in the assembly and in particular the effect of the load application height. This model was then validated via several 3D finite elements sinulations and gives excellent results.