Pump-type floating piston damper

Abstract

The invention discloses a pump-type floating piston damper comprising a guide sleeve and seal assembly, an operating cylinder, a piston rod, a piston, an energy accumulator, an oil chamber and a bottom valve. The piston comprises an upper cavity and a lower cavity. The piston rod comprises a hollow cavity and a sliding changeover passage used to change passages from the upper and lower cavities to the hollow cavities; specifically, in a compression travel, the lower cavity is in oil communication with the hollow cavity; in a return travel, the upper cavity is in oil communication with the hollow cavity. A lower end opening of the hollow cavity of the piston rod is closed, and an upper end opening of the piston rod is in oil communication with the oil chamber through a piston rod return oil pipe. The oil chamber is in one-way oil communication with the upper cavity through an upper cavity oil supplement one-way valve and a lower cavity oil supplement pipe. The oil chamber is in one-way oil communication with the lower cavity through a lower cavity oil supplement one-way valve mounted on the bottom valve. Oil flows constantly in a single direction and always flows by an external pipeline, so that radiating effect is significantly improved; the pump-type floating piston damper can arranged in multiple structural layout forms to adapt to vehicles at different application places.

Description

technical field [0001] The invention belongs to the technical field of hydraulic damping, and in particular relates to a pump-type floating piston shock absorber capable of improving the heat dissipation performance of the shock absorber through unidirectional flow of oil. Background technique [0002] Hydraulic damping shock absorber is an important part of automobile chassis, which plays an extremely important role in isolating and attenuating suspension vibration. At present, the cylinder type hydraulic shock absorber is the most widely used in vehicles, and the basic principle of its damping is the throttling effect of small holes. When the car is running on an uneven road, the damping effect of the shock absorber converts the kinetic energy of the car's vibration into the heat energy of the shock absorber oil, which is then lost to the surrounding environment through each cylinder. The generation of heat will lead to changes in the working temperature of the shock abso...

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Problems solved by technology

[0003] In the compression stroke and recovery stroke of the traditional shock absorber, the oil reciprocatingly passes through the piston valve and the bottom valve, and the oil flow is concentrated, causing the temperature of the oil to rise, and the rise of the oil temperature will cause the following hazards: (1) cause the oil to Viscosity changes affect the damping characteristics of the shock absorber, which in turn affects the vibration isolation characteristics of the suspension system; (2) Accelerate the aging of the sealing components, resulting in premature failure of the seals, causing high temperature oil and air leakage of the shock absorber; (3) It is easy to cause the cavitation effect of the oil, resulting in the characteristic distortion of the shock absorber and abnormal noise; (4) Indirectly, the change of the external characteristics of the shock absorber due to the temperature rise will affect the handling and ride comfort of the whole vehicle

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