Electric hydraulic pump for vehicle power steering

Abstract

The invention belongs to hydraulic components and particularly relates to an electric hydraulic pump for vehicle power steering. The upper end and the lower end, where a race I (28), a race II (29), a driving gear (14) and a driven gear (24) are mounted inside respectively, of a hydraulic pump body (3) are movably mounted on the race I (28) and the race II (29) in a penetrating manner respectively; an oil filtration screen (25) is fixedly mounted below the position corresponding to an oil return port (12) in an oil can (1); a cross coupler (4) is connected with the lower end of the driving gear (14) and the upper end of a rotor shaft (15) respectively; the rotor shaft (15) is mounted in a casing (5) in a penetrating manner; a stator (18) is mounted in the casing (5); a rotor (17) is movably mounted in a cavity of the stator (18) in a penetrating manner; a motor front cover (16) and a cooling plate (9) are fixed on the casing (5) through bolts; a shaft head magnet (20) is fixedly mounted at the lower end of the rotor shaft (15); a controller (7) is fixedly mounted on the lower end surface of the cooling plate (9) through a controller front cover (8). The electric hydraulic pump for vehicle power steering is compact in structure, convenient to assemble, high in efficiency and low in noise.

Description

technical field [0001] The invention belongs to hydraulic components, in particular to an electric hydraulic pump for vehicle power steering. Background technique [0002] In the traditional automobile power steering system, the mechanical hydraulic steering pump driven by the engine is usually used. In order to ensure the portability of the car in situ steering or low-speed steering, the displacement of the hydraulic pump is determined by the flow rate of the engine at idle speed. The problem with this kind of mechanical hydraulic steering pump is that this system will work no matter whether it is turning or not after the car is started, and it does not realize real power adjustment. It uses a constant flow method, which can only solve the problem of steering wheel fluttering. When the vehicle speed increases, the engine speed increases, the flow rate of the pump increases, and the control valve controls most of the hydraulic oil. Instead, the steering gear oil cylinder fl...

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Problems solved by technology

[0002] In the traditional automobile power steering system, the mechanical hydraulic steering pump driven by the engine is usually used. In order to ensure the portability of the car in situ steering or low-speed steering, the displacement of the hydraulic pump is determined by the flow rate of the engine at idle speed. The problem with this kind of mechanical hydraulic steering pump is that this system will work regardless of whether the car is turning or not after the car starts, and it does not realize real power adjustment. It uses a constant flow method, which can only solve the problem of steering wheel fluttering. When the vehicle speed is increased, the engine speed increases, the flow rate of the pump increases, and the control valve controls most of the hydraulic oil without entering Instead, the steering gear cylinder flows back into the pump, which causes a large reactive power loss of energy

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