A hydraulic transformer with a swash block control around three axis of rotation

摘要

A new design of a hydraulic transformer is presented. The design combines the floating cup principle and the three-port hydraulic transformer concept of Innas. The design resembles the design of the variable displacement, floating cup pump. An important difference is the bearing of the swash block. In the variable displacement pump, the swash block has a cylindrical bearing, and has only one degree of freedom. In the new transformer design, the swash block is supported by a spherical bearing, which results in three rotational degrees of freedom. This paper describes the fundamental design principle of the new 'Oiler' transformer, its design constraints and the most important design solutions. The new design allows an unlimited control range of the hydraulic transformer, combined with large, unrestricted oil passages for all operating conditions.