Ball Screw Peripheral: Support Unit

Support units are dedicated bearing components used as a set with ball screws.
They come in several types: models EK, FK, FKT, EF, and FF, which are tailored to fit Model BNK and Model SDA-VZ precision ball screws with finished shaft ends; models EK-L and EF-L, which are for low shaft centers; and models BK and BF, which are standardized for general ball screws.
The support unit on the fixed side includes a JIS Class 5-compliant angular bearing provided with an adjusted preload. The support unit on the supported side uses a deep-groove ball bearing.

Handling Precautions

Types

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Features

Structure and Features

Support units come in several types: models EK, FK, FKT, EF, and FF, which are tailored to fit Model BNK and Model SDA-VZ precision ball screws with finished shaft ends; models EK-L and EF-L, which are for low shaft centers; and models BK and BF, which are standardized for general ball screws.
The support unit on the fixed side includes a JIS Class 5-compliant angular bearing provided with an adjusted preload.
The support unit on the supported side uses a deep-groove ball bearing.
The internal bearings of support unit models EK, EK-L, FK, and BK contain an optimal quantity of lithium soap-based grease retained by a special seal, enabling these models to operate over a long period of time.

Optimal Bearing Utilization

To ensure rigidity balance with the ball screw, the support unit uses an angular bearing (contact angle: 30°; DF configuration) with a high rigidity and a low torque. Miniature support unit models EK/FK 4, 5, and 6 incorporate a miniature angular bearing with a contact angle of 45° and an increased number of balls with a smaller diameter. The high rigidity and accuracy of the miniature angular bearing provides stable rotational performance.

Support Unit Shapes

Support units are available in square and round shapes to fit various intended applications.

Compact and Easy to Install

The support unit is compactly designed to accommodate the space in the installation site. The support unit includes a bearing with an adjusted preload, so it can be assembled with a ball screw unit with no further machining, reducing the labor required for installation and increasing the assembly accuracy.

Support Unit for Low Shaft Centers EK-L/EF-L

We offer a lineup of support units with specifications that match the shaft end shapes of precision ball screws with finished shaft ends. Combined use with these support units helps reduce design time.