CONTROLLABLE COOLANT PUMP WITH AN ELECTRO-HYDRAULIC BAFFLE PLATE ADJUSTMENT

摘要

The invention relates to a controllable coolant pump (1) of a cooling circuit for an internal combustion engine, having a pump housing (2), in which a pump shaft (3) with associated impeller (8) is rotatably arranged. The impeller (8) conveys a coolant as a volume flow via an intake connection (9) in a pressure or spiral channel of the coolant pump (1). The volume flow can be influenced by a baffle plate (11) which encloses the outside of the impeller (8), the push rod (12) of said baffle plate being guided in the pump shaft (3). In connection with an actuator (17) the baffle plate (11) can be continuously adjusted between two limit positions against the force of a spring means (30). A control element, which has an electro-hydraulic action and which is integrated into the pump shaft (3), serves as an actuator (17), wherein the pressurised coolant in the coolant pump (1) is provided as a hydraulic fluid.