A stepless volume adjustable air spring and its control method

Abstract

The invention discloses an air spring with stepless volume adjustment and a control method thereof, which comprises a cover plate fixedly connected with the vehicle frame, an air bag, a base fixed on the spring seat of the axle, a piston filled in the inner cavity of the base, a connecting Rod, crankshaft and motor, the upper seal of the airbag is in interference fit with the cover plate, the lower seal is in interference fit with the base and the space above the piston penetrates the lower seal, the piston pin of the piston is connected with the crank pin of the crankshaft through a connecting rod, The motor controls the rotation of the crankshaft and drives the piston to reciprocate in the base through the connecting rod to change the volume of the air bag. In the present invention, the crankshaft, connecting rod and piston mechanism are directly installed in the inner cavity of the base, and the piston can move up and down in the inner cavity of the base axially under the drive of the stepping motor, and the volume swept by the piston is equal to the volume change of the air spring. The air spring volume can be achieved by setting an additional air chamber outside, which saves the limited suspension installation space.

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 bearing and dynamic rebound, and has the functions of mitigating impact and reducing vibration. Since the conventional air spring is fixed in structure, it cannot be adjusted actively because there is no adjustable mechanism in application, so it is difficult to adapt to complex working conditions and changing driving environment, and it cannot make the car have good riding comfort and operating stability. Therefore, on the basis of the conventional air spring structure, how to further improve and design its structure to make it have various properties is an urgent issue for researchers to solve. [0003] The mechanical properties of the air spring are related to the initial air pressure, effective area, volume and its rate of change. Accord...

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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