Slewing bearing

About: Slewing bearing is a research topic. Over the lifetime, 1498 publications have been published within this topic receiving 5309 citations.

Effects of Bearing Characteristic on the Gear Load Distribution in the Slewing Reducer for Excavator

Abstract: A slewing reducer consists of two planetary gearsets which require a good load distribution over the gear tooth flank for enhanced durability. This work investigates how the bearing characteristics influence the load distribution over the gear tooth flank. A complete system model is developed to analyze a slewing reducer, including the non-linear mesh stiffness of the gears and the non-linear stiffness of bearings. The results indicate that the type, arrangement and preload of the output shaft bearings greatly influence the gear mesh misalignment, contact pattern, face load factor, gear safety factor and lifetimes of the parts.

Hay-drying and storage silo having a slewing jib crane

Abstract: A silo (1) has a slewing jib crane (2), the crane bridge (5) of which is mounted on a circular crane runway (4) on the outside only. An annular slewing rim is arranged concentrically within the crane runway (4) and carries the other end of the crane bridge on a bearing device (13) which is preferably made in the form of a half-ring. In this way, the slewing jib crane is greatly simplified, since now only a single drive motor is needed. Moreover, the silo can be fed by way of a central feed pipe (16) which is arranged in the centre of the annular slewing rim (12).

Slewing Bearings for Excavators, Cranes, and Like Earth-Moving Machines.

Abstract: 1,167,821 Slewing bearings for jib-cranes KLOCKNER-WERKE AG 6 Jan, 1967, No 970/67 Heading B8B [Also in Divisions E1 and F2] A jib-crane has a slewing bearing which incorporates a resilient ring 24, Fig 3, between bearing surface 23 of a slewing platform 2 and the upper surface of the upper part 15 of the race which rotates with the platform 2 This enables the platform 2 to tilt when the centre of gravity of the load moves outside the slewing ring, thereby deforming the race and spreading the load over more balls in the race Fig 4 shows an embodiment which has two resilient rings 24, 38 The resilient rings may be of metal having a smaller modulus of elasticity then steel, synthetic plastics materials, hard wood or an assembly of spring steel rings Fig 5 (not shown), illustrates the latter

Cooling arrangement for a propulsion unit

Abstract: A propulsion unit is disclosed with a hollow strut having an upper portion with an upper end portion passing through a passage (P 1 ) formed between a first outer bottom and a second inner bottom in a vessel. The upper end portion is rotatably supported with a slewing bearing and sealed with a slewing seal towards the vessel. A cooling arrangement includes a cooling air duct system, at least one fan and at least one cooling unit. The slewing seal can include an upper slewing seal and a lower slewing seal at a vertical distance (H 1 ) from each other with a space formed between the slewing seals. The upper end portion has openings (O 1 ) into the space between the slewing seals. A first cooling air duct is directed to this space, whereby cooling air (L 1 ) can be circulated through the first cooling air duct ( 400 ) into the space and through the openings (O 1 ) in the upper end portion to the interior of the strut, or return air (L 2 ) can be circulated from the strut in an opposite direction.

Slewing all-wheel-drive crane - incorporates derricking joint slewing ring coaxially one above the other

Abstract: The self-propelled crane with all-wheel drive is particularly for use with a suction cup when laying plaster slabs. It has a full-circle-slewing suerstructure with derricking jib, hydraulic motors being used for driving the wheels and slewing. The derricking joint (17) and the slewing ring (18) are situated one above the other and coaxially, and have a rotary joint for the hydraulic pressure pipes. The superstructure (3) comprises a plate supporting the jib, the tailweight (16) and the driving position (15), and with the slewing ring directly underneath it. The latter in turn is supported directly on the derricking joint in the chassis (1). Outriggers on the latter above the wheels (2) unfold outwards and downwards, to form supports at four points on the ground. USE/ADVANTAGE - Lightweight, low overall height and centre of gravity, and easily manoeuvrable.