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Filler plug

IP.com Disclosure Number: IPCOM000235445D
Publication Date: 2014-Feb-28
Document File: 1 page(s) / 239K

Publishing Venue

The IP.com Prior Art Database

Abstract

A filler plug (FP) is a device that retains the balls or rollers (rolling elements) in a slew-ring (or blade bearing) after assembly. Traditionally the FP was made of steel and was secured in place with a robust tapered pin (TP) that passed through the bearing ring and FP. This system needed to be strong because the FP tended to carry significant loads from the rolling elements. In some prior art arrangements, a cylindrical pin has been used instead of a tapered one. Due to new improvements in blade bearing designs, the FPs are required to carry less load; in some designs they even no longer carry any load at all from the rolling elements. This allows them to be made in a simpler, lighter and cheaper way. The present idea proposes that the FP is instead moulded in a more elastic material, e.g. a plastic, and can be retained in place by a simple fixing means on the outside of the bearing, e.g. a simple screw, instead of the expensive tapered pin. Furthermore only one sealing O-ring may be required instead of the traditional two. There are additionally significant savings by the elimination of various machinings. The left-hand sketch shows the traditional FP and TP (highlighted) in position in the bearing. The right-hand sketch shows an embodiment of the proposed and potentially much cheaper arrangement using a moulded plastic FP installed in the bearing with a single fixing screw. Obviously the present idea is not limited to the presently shown design, and a skilled person would be fully aware of possible variations with respect to choice of fixing means, positioning of the fixing means, material of the FP, and so on. Further, any combinations of the described traditional designs and the described novel design could also be considered to be within the scope of the present idea.

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Filler plug

A filler plug (FP) is a device that retains the balls or rollers (rolling elements) in a slew-ring (or blade bearing) after assembly. Traditionally the FP was made of steel and was secured in place with a robust tapered pin (TP) that passed through the bearing ring and FP. This system needed to be strong because the FP tended to carry significant loads from the rolling elements. In some prior art arrangements, a cylindrical pin has been used instead of a tapered one.

Due to new improvements in blade bearing designs, the FPs are required to carry less load; in some designs they even no longer carry any load at all from the rolling elements. This allows them to be made in a simpler, lighter and cheaper way. The present idea proposes that the FP is instead moulded in a more elastic material, e.g. a plastic, and can be retained in place by a simple fixing means on the outside of the bearing, e.g. a simple screw, instead of the expensive tapered pin. Furthermore only one sealing O-ring may be required instead of the traditional two. There are additionally significant savings by the elimination of various machinings.

The left-hand sketch shows the traditional FP and TP (highlighted) in position in the bearing. The right-hand sketch shows an embodiment of the proposed and potentially much cheaper arrangement using a moulded plastic FP installed in the bearing with a single fixing screw.

             

Obviously the present idea is not limited to the presentl...