Air spring with stepless-adjustable volume and control method thereof

Abstract

The invention discloses an air spring with the stepless-adjustable volume and a control method thereof. The air spring comprises a cover plate, an air bag, a base, a piston, a connecting rod, a crankshaft and a motor, wherein the cover plate is fixedly connected with a vehicle frame, the base is fixed to an axle spring seat, and the piston, the connecting rod and the crankshaft are arranged in an inner cavity of the base in a filling mode. An upper seal opening of the air bag is in interference fit with the cover plate, a lower seal opening of the air bag is in interference fit with the base, and the space above the piston communicates with the lower seal opening. A piston pin of the piston is connected with a crankshaft pin of the crankshaft through the connecting rod, and the motor controls the crankshaft to rotate and drives the piston to reciprocate in the base through the connecting rod so as to change the volume of the air bag. The crankshaft, the connecting rod and a piston mechanism are directly mounted in the inner cavity of the base, the piston can be driven by the stepping motor to reciprocate up and down in the axial direction in the inner cavity of the base, the volume of the part, where the piston sweeps, is equal to the volume changing amount of the air spring, the volume of the air spring can be adjusted without an externally arranged additional air chamber, and the limited suspension mounting space is saved.

Description

technical field [0001] The invention relates to a vehicle suspension system, in particular to an air spring. Background technique [0002] The air spring uses the air pressure and compressibility of the sealed air to achieve static load and dynamic rebound, and has the function of mitigating impact and reducing vibration. Once the conventional air spring is fixed in structure, it cannot be actively adjusted due to the absence of an adjustable mechanism during application. Therefore, it is difficult to adapt to complex working conditions and changing driving environments, and cannot make the car have good ride comfort and operational stability. Therefore, on the basis of the conventional air spring structure, how to further improve the design of its structure so that it has a variety of performances is an urgent problem to be solved by the majority of scientific researchers. [0003] The mechanical properties of the air spring are related to the initial air pressure, effecti...

AI Technical Summary

Problems solved by technology

A considerable part of the achievement is to use air pressure to regulate the mechanical properties of the air spring, that is, to use the solenoid valve to continuously charge and deflate the air spring. Although the control idea is simple, the continuous charging and discharging of air will waste energy, resulting in the failure of compressors, solenoid valves, etc. Reduced component life

There are also quite a few achievements to achieve the purpose of improving the performance of the air spring by changing the external shape of the air spring base, but once the external shape of the base is fixed, it cannot be dynamically adjusted.

Other achievements mainly revolve around the volume of the air spring, such as adding several auxiliary air chambers. The gas in the auxiliary air chambers and the gas in the air spring are connected or disconnected by solenoid valves. This method is limited by the number of auxiliary air chambers. The influence of the road surface is often adjusted in stages. The more mature scheme is adjustable in three levels: soft, medium and hard. However, the actual road unevenness stimulates the wheels randomly, and stepless adjustment can better adapt to road conditions. Moreover, the auxiliary air chamber that is three times the volume of the large air spring brings many challenges to the installation, wasting the very limited suspension installation space

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