LARGE PLUMMER BLOCK HOUSINGS

SNCD large plummer block housings The heavy-duty range

CONTENTS 1. SNCD large plummer block housings Bearing arrangement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Fixed and floating bearings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Long service life and high operational reliability. . . . . . . . . . . . . . . . . . . 6 Design details . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Configuration of bearing housings . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 3. Seal systems Labyrinth seal TS. . . . . . . . . . . . . . . . . . . . ....

The plummer block housings of the SNCD series developed by NTN-SNR are designed for highly demanding, continuous use in mining, conveying, materials and steel industry applications as well as in other heavy industries . Equipped with spherical roller bearings, during operation these bearing units can bear massive loads . SNCD housings are available for bearings with a shaft diameter ranging from 115 mm to 500 mm and from 5 13/16 inches to 18 1/2 inches .

2 . PRODUCT DESCRIPTION The SNCD split plummer block housings are similar in design to the housings of the SNC series .The housing’s ductile EN-GJS cast iron body comprises an upper and a lower section . The two halves are joined by four connecting bolts .To protect the bearing, seals are used in the shaft outlet holes The standard accessories that NTN-SNR offers for these housings include labyrinth seals and high-performance multiple seals (Taconite) . Labyrinth seals are well-suited for ambient conditions with normal contamination . Taconite seals, on the other hand, with their extraordinarily...

In order to optimise the support and guidance of the bearing, our engineers have concentrated on the design of the bearing seat . The highly precise geometry of the bearing seat during operation is the key to high operational reliability and perfect function of the rolling bearing . The housings of the SNCD series have newly developed design elements, such as the wide reinforcement rib on the upper section and the archshaped support structures in the lower section . These structural design elements enable the SNCD housings to achieve high stiffness, provide for improved load distribution, and...

Lubricant supply All housings are equipped as standard with three lubrication holes . There are two holes in the upper section and a third is located on the side of the housing . Markings on the casting surface indicate additional options for the placement of grease nipples . One flat and one conical grease nipple (M10x1 each) as well as one adapter (M10x1 to G1/4) are included inside the housing . Chapter "Lubrication” p . 16 SNCD housings are already equipped with two grease escape bores at the factory . They are fitted with threaded plugs .To discharge used, excess grease, these holes must...

Contact surfaces and markings for additional dowel pins The foot bolt mounting arrangement is designed for forces acting vertically on the clamping area. If high axial forces or forces parallel to the clamping area (>55°) act against the housing, it must be pinned and/or braced against a shoulder. For this purpose, contact surfaces (2) have been machined into the housing foot. These surfaces also help to ensure precise alignment of the housing on the clamping area. Locating marks (1) for additional dowel holes are cast in and must be drilled out as needed. Mounting holes Alignment errors reduce...

Drip edge The surrounding edge prevents the penetration of moisture at the interface between the upper and lower section. Upper and lower section marking The serial numbers imprinted on the side of the housing body are used to correctly assign the upper and lower section. When installing multiple housings, the upper and lower sections must be maintained as pairs and never interchanged, because they are matched during production. Disassembly edge Facilitates disassembly for maintenance of bearing units. A lever can be used to easily separate the upper and lower sections of the housing from each...

Configuration of bearing housings The use of spherical roller bearings of various dimension ranges and a wide variety of mounting arrangements make it possible to create many different housing configurations from the SNCD modular system. As standard, SNCD housings are compatible with ISO standard 30 and 31 sized spherical roller bearings, but they can also be fitted with other ISO standard sized bearings. The selection of the bearing and the design of the bearing arrangement depend mainly on the type of application Example 1 SNCD plummer block housing for spherical roller bearings with cylindrical...

Application area Universal seal for environmental conditions with normal contamination and for applications with high circumferential speeds and/or high ambient temperatures . The labyrinth seal TS comprises a labyrinth ring made of cast iron or steel and a silicone tube . A non-contact labyrinth with a narrow sealing gap is formed between the radial labyrinth elements of the seal ring and the rectangular sealing groove of the housing The labyrinth ring, which can be pushed onto the shaft easily, rotates at the shaft speed . The silicone tube installed between shaft and labyrinth ring ensures...

Taconite seal TAApplication area High-performance seal with maximum reliability under extremely demanding operating conditions . Taconite seals are suitable for use in environments heavily contaminated with dust, stones and spray water. Taconite seals are multiple sealing systems that achieve highly effective sealing through the combination of different sealing concepts . • Re-lubricatable labyrinth system with axial labyrinth elements • V-ring seal • Space completely filled with grease, which serves as a grease barrier NTN-SNR Taconite seals comprise several components . The stator ring and...