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Bearings - 2015-12-14

NSKTAC03 high-load drive ball screw support bearings

NSK Ltd. announced that it has expanded the size of its NSKTAC03 high-load drive ball screw support bearings for large electric injection molding machines.

Development Background

As automobiles become more energy efficient and emission regulations become even stricter, there is a greater need to reduce the weight of hybrids and electric vehicles. This need is in turn driving the need for larger plastic components such as large one-piece bumpers and door modules, as well as instrument panel interior components.

In the past, hydraulic injection machines capable of high loads were the solution for forming these large components. Today, however, electronic injection machines, which are energy efficient and clean (since they do not require oil), are seeing greater and greater demand.

Product Features

Expanded size, up to an inner diameter of 180 mm
NSK expanded the size range from 120 mm to 180 mm, making it possible to support high-load ball bearings. Up until now, thrust self-aligning roller bearings were used for high-load ball screw applications, but this increase in size makes it possible to use angular ball bearings instead.

Product Benefits

1. Compared to thrust self-aligning roller bearings, which have been broadly used to date, this newer product uses half the torque and rotates smoothly in both forward and reverse directions.

2. Hanging bolt holes are now standard, so it is easy to use cranes to assemble heavy bearings. This helps to improve efficiency at production sites.

The increasing size of electric injection molding machines and servoless machines has heightened demand for drive ball screws with a higher capacity. As such, the need for higher performance in support bearings has also increased. In 1996, NSK launched its dedicated support bearing for high-load drive ball screws. Since then, NSK has continued to expand its product lineup for higher loads and other special needs.

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