Topic
Slewing bearing
About: Slewing bearing is a research topic. Over the lifetime, 1498 publications have been published within this topic receiving 5309 citations.
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Patent•
27 Jul 2011
TL;DR: In this article, an independent-steering oil gas suspension system consisting of an axle, a rotary arm, a swinging arm and an inner gear ring of the slewing bearing is connected with the rotating arm, and an oil cylinder travel transmitter is installed on the suspension oil cylinder.
Abstract: The utility model relates to a suspension steering system and discloses an independent-steering oil gas suspension system. The independent-steering oil gas suspension system comprises an axle, a rotary arm, a swinging arm, a swinging cylinder, a slewing bearing, a suspension oil cylinder, an energy accumulator and an oil cylinder travel transmitter, wherein the swinging cylinder is arranged on a frame and is connected with the rotary arm; the swinging cylinder is provided with a coder; an outer gear ring of the slewing bearing is connected with the frame, and an inner gear ring of the slewing bearing is connected with the rotary arm; the rotary arm is connected with the swinging arm; the swinging arm is connected with the axle; the energy accumulator is connected with a hydraulic source; the oil inlet of the suspension oil cylinder is connected with the energy accumulator; the cylinder barrel of the suspension oil cylinder is connected with the rotary arm; the piston rod of the suspension oil cylinder is connected with the swinging arm; and the oil cylinder travel transmitter is installed on the suspension oil cylinder. By adopting the swinging cylinder as the steering driving mechanism, the independent-steering oil gas suspension system provided by the utility model has the advantages of compact structure, good use effect and low cost, is convenient to assemble and disassemble, is especially suitable for vehicles with smaller space and is easy to maintain.
4 citations
Patent•
18 May 2011
TL;DR: In this paper, a duplex-gear slewing mechanism was proposed, where the primary planetary gear adopts the duplex gears, so that reduction ratio is increased and output torque is improved within strength allowed by the mechanism.
Abstract: The utility model relates to a novel duplex-gear slewing mechanism. A motor provides input power; a shaft sleeve of the motor drives a primary sun gear by the aid of a transmission shaft; the primary sun gear is connected with a primary planetary gear; the primary planetary gear meshes with a primary inner gear ring; the primary planetary gear adopts duplex gears; a primary planet carrier is connected with a secondary sun gear; the secondary sun gear meshes with a secondary planetary gear; the secondary planetary gear meshes with a secondary inner gear ring; a secondary planet carrier is connected with a tail-end output shaft; and the tail-end output shaft is provided with a gear meshing with a slewing bearing. A plurality of parts of the novel duplex-gear slewing mechanism are integrated, so that the mechanism is more compact and reasonable and smaller in volume. The primary planetary gear adopts the duplex gears, so that reduction ratio is increased and output torque is improved within strength allowed by the mechanism. For some slewing mechanisms of specific types, three-stage transmission is even converted into two-stage transmission, and accordingly the volume and the weight of the mechanism is decreased more, so that the mechanism is more compact, and cost is reduced.
4 citations
Patent•
06 Feb 2018
TL;DR: In this article, a method for adopting lifting equipment to integrally lift a slewing bearing of a steel ladle of a continuous casting machine for replacement is described, which has the advantages of being short in maintenance time during operation andlow in labor intensity.
Abstract: Disclosed is a method for adopting lifting equipment to integrally lift a slewing bearing of a steel ladle of a continuous casting machine for replacement. The method is characterized in that firstly,a crane is instructed to hang the steel ladle downwards, wall bricks at the periphery of a ladle turret are dismantled, and oil stains on site are cleaned away; a fork-shaped arm rises to the highestposition, the gap between the fork-shaped arm and the main arm is stuffed with a steel plate for locating, a jacking oil cylinder and columns are installed above a cement crossbeam, and the upper ends of the columns are fixed to the fork-shaped arm in a burnt-out welded mode; a locking device, a hydraulic sliding ring, an electrical sliding ring and inner and outer ring connecting bolts of the slewing bearing are dismantled, wherein the locking device, the hydraulic sliding ring, the electrical sliding ring and the inner and outer ring connecting bolts are arranged on the slewing bearing; theladle turret is controlled to rise, a scissor fork is used for reinforcing the jacking column, and the protection column is installed; an adopted hand chain hoist is fixed at the lower end of the ladle turret to lift the slewing bearing, a sliding steel pipe is inserted in a base, a prepared thin plate is inserted while the inner ring bolts of the slewing bearing are lifted upwards, and the slewing bearing is placed on the sliding steel pipe; a platform is established and is flush with the base, the hand chain hoist is used for horizontally pulling the slewing bearing out to the middle of theplatform, the disassembly of the slewing bearing is completed, and a new slewing bearing is installed. The operation method has the advantages of being short in maintenance time during operation andlow in labor intensity.
4 citations
02 Aug 2014
TL;DR: In this paper, a mathematical model is defined which enables the determination of the vectors of force and moment of bearing loads, on the basis of the measured quantities of the state of an excavator in operation under exploitation conditions.
Abstract: The paper presents a procedure for experimental determination of slewing bearing loads in the rotating platform drive mechanisms of hydraulic excavators with an excavating manipulator. A mathematical model is defined which enables the determination of the vectors of force and moment of bearing loads, on the basis of the measured quantities of the state of an excavator in operation under exploitation conditions. The measured quantities of the state of an excavator relate to the position of the kinematic chain and pressures of the hydrostatic system in the actuator ducts of the excavator drive mechanisms. As an example, the paper provides the research results obtained in the experimental determination of slewing bearing loads in the rotating platform drive mechanism of a hydraulic excavator with the mass of 16t.
4 citations
Journal Article•
TL;DR: In this article, the authors presented the main disabled forms, and discussed the limitations of the current methods in which rating lifetime is calculated and condition at operation is estimated for the large-diameter antifriction bearings.
Abstract: This paper presents the main disabled forms,and discusses the limitations of the current methods in which rating lifetime is calculated and condition at operation is estimated for the large-diameter antifriction bearings.The novel method in which the residual service lifetime of slewing bearing mounted in ladle turret is evaluated by the dynamic abrasion loss is put forward.On the basis of the method,testing and analysis are carried out.The results shows that residual service lifetime is reasonably predicted and the method is valid.
4 citations