Hitachi Big Drum

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Marziabo Frechette

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Aug 3, 2024, 5:07:26 PM8/3/24

to antrophelri

A brake drum is a cylindrical drum that is attached to the inside of a car's wheel, and so rotates at the same speed as the wheel. The drum surrounds a set of brake shoes that are coated in materials that generate friction.

When the brake pedal is pressed, these shoes are pushed outwards against the inner surface of the brake drum, generating friction and so slowing the car down. A brake drum is usually made of iron, rendering it resistant to wear.

Hitachi Astemo's Brake Drums are designed and tested to support the vehicle braking requirements, while providing the smooth braking experience in various road conditions. Our high-performance products are made for consumers who prefer smooth handling of their vehicles.

After developing a fixed head type magnetic drum in 1959, Hitachi had increased capacity, but by using the new floating head system, they were able to narrow the spacing between the magnetic head and the media on the surface of the rotor to 5μm (1/6 of the previous value) -thereby attaining a capacity of 2MB (megabytes), 6 times the previous capacity. A dual-body planar slider with stable floating characteristics was used for the new floating head, and mounting density was increased by using a 4-multi-track structure. This magnetic drum memory unit was configured to enable connection of up to a maximum of four 2MB magnetic drums to a single unit.

The features of this magnetic drum included an extremely short access time (10.3ms for the main unit) and extremely stable performance with few errors. It was used mainly for large high-speed electronic computers, but as capacity increased, it came into wide use in new fields.