TYPE 4 BEARINGS The Type 4 bearing is a spherical roller bearing and was specifically designed for use with Composite and Aluminium rudderstocks.
Being a spherical roller bearing this allows the bearings to self align and turn whilst under load maintaining low steering friction. The bearing features an aluminium inner race supported by up to three rows of Ertalyte® or Peek® barrel shaped rollers. These rollers and inner race assembly are fitted within a spherical outer housing. All parts are precision-machined in-house at JP3 to ensure quality. Seal housings are fitted above and below the main bearing races to make the assembly watertight. Type 4 bearings can be used as both upper and lower bearings. Bearings are available with one, two or three rows of rollers to match rudder loads and bearing safe working loads. A lesser number of rows will mean a lighter bearing. The barrel shaped rollers and spherical outer housing allows the bearing to self-align while the rudderstock rotates within the bearing. Outer housings and inner races are machined from solid marine grade aluminium. V seals located in the upper and lower seal plates, combined O-ring between the rudder bearing and rudder stock ensure the bearing is watertight. Bearings are available in any size from 60mm upwards. To date the largest bearing produced is 1150mm. A full range of complementary parts is available for the Type 4 bearing, some of which are necessary for a new installation. All aluminium parts are anodised in our in-house anodisation plant to ensure quality and prevent corrosive action. Type 4 bearings are Germanischer Lloyd and Lloyd Register Type Approved.
NEW TYPE 48 RACING SERIES BEARINGS Based on our proven Type 4 design this new bearing was pushed to its limits with every effort made to reduce weight. The result was 250mm diameter two roller bearings that weighed only 4.1 kilograms. This bearing proved its efficiency and reliability during the 2003 Louis Vuitton and Americas Cup and where used by over half the race fleet. Having proven the bearing on the racetrack JP3 has further developed bearing, with greater water tightness and safe working load to provide the security level demanded of yachts competing in transoceanic races. Know as the Type 48 this new range of bearings, and this new bearing range can offer significant savings. In some cases the type 48 bearing is less than half the weight of its type 40 series equivalent. TYPE 4 BEARING DESIGNATION Click to obtain all JP3 bearings designations. COMPLEMENTARY PARTS Housings Whether the rudder structure is welded or laminated into the hull JP3 supply correct housing solution to ensure the correct positioning and fixing to the hull. With bearings with tapered housings these parts ensure the correct installation of the bearing. Composite housings are made from an E-Glass laminate, so for installation into a carbon hull this ensures the correct electrical isolation and long term reliability of the bearing. Metal housings designed to be welded into the hull structure are machined from solid marine grade aluminium. Other metals are available on request. Flanged housings available on request. Retaining Rings Specifically designed to carry heavy axial loads, retaining rings secure the rudder in position. These rings are clamp onto the rudderstock and locate against the moving inner race. There will be one ring above the lower bearing to support the rudder and a second ring below the upper bearing, to account for any rudder buoyancy and upwards grounding loads. Thrust Races Where axial loads are high due to a heavy rudder additional thrust races can be fitted above the lower bearing to ensure the axial loads can be carried satisfactorily. Inner Sleeves JP3 inner sleeves are designed to fit with the inner races of our bearings. They are female moulded composite part with a hard tooling grade gel coat external finish. Inner sleeves are a fast cost effective way a composite rudder stock round.
|
