COMPACT HYDRAULIC UNIT

摘要

The invention relates to a hydraulic unit comprising an annular cylindrical pressurized-medium container which has an outer external wall and an inner external wall and two face flanges, comprising a closed electric motor cooled by a stream of cool air and surrounded by the pressurized-medium container, and a hydraulic pump driven by an electric motor. The object of the invention is to provide said unit with a very compact structure, while cooling the electric motor sufficiently for continuous operation. The object is attained in that the pressurized-medium container fits closely around the electric motor and the inner external wall of the pressurized-medium container is used to guide the stream of cool air passing over the electric motor. Consequently, the entire stream of air flowing between the electric motor and the pressurized-medium container is used fully for cooling the electric motor and also passes over the electric motor end windings which are remote from a fan wheel, along the housing of said electric motor. The compact structure of the unit thus ensures sufficient cooling of the electric motor.