A method for analyzing the steering interference of a vehicle suspension

Abstract

The application discloses a kind of automobile suspension steering interference analysis methods, comprising the following steps: three-dimensional coordinates of knuckle arm hinged point under analysis working condition are derived by CAE analysis, the projection of three-dimensional coordinates is on vehicle longitudinal symmetry center plane and is connected in turn, while the movement trajectory of knuckle arm hinged point with steering straight pull rod is projected on vehicle longitudinal symmetry center plane, above-mentioned two line measurement comparison can be directly and accurately analyzed suspension steering interference amount.The automobile suspension steering interference analysis method is reasonably designed, establishes independent basic numerical model, the spatial coordinates of steering hinged point are accurately derived by CAE analysis, then graphing method is directly solved to obtain suspension steering interference amount, while it can be obtained by parameter adjustment and CAE analysis iterative optimization that the design analysis data satisfying design target;Analysis precision is high, and interference amount can be effectively identified.

Claims

1. A method for analyzing the interference of automotive suspension steering, characterized in that: The automotive suspension steering interference analysis method includes the following steps: The three-dimensional coordinates of the steering knuckle hinge point under the analysis condition are derived by CAE analysis. The three-dimensional coordinates are projected onto the longitudinal symmetry center plane of the vehicle and connected sequentially. At the same time, the motion trajectory of the steering knuckle hinge point along the steering tie rod is projected onto the longitudinal symmetry center plane of the vehicle. The above two measurements and comparisons can intuitively and accurately analyze the suspension steering interference. The aforementioned interferometric analysis method requires the establishment of a CAE three-dimensional structural data model. The method for establishing the CAE three-dimensional structural data model is as follows: A corresponding vehicle frame is taken as the basis for suspension installation. The vehicle frame can be an integral structure or a local structure that meets the analysis requirements. The front of the vehicle frame has a bracket for mounting leaf springs. The leaf springs can rotate around the mounting axis of this bracket, and their sides contact the bracket, restricting their lateral displacement. A swing arm bracket that can rotate on the vehicle frame is set behind the front bracket. At the same time, its lateral position is constrained by the vehicle frame and cannot move laterally. The rear end of the leaf spring is mounted on the swing arm bracket. The leaf spring can rotate around the mounting axis but cannot move laterally. The leaf spring is installed below the vehicle frame. The middle part of the leaf spring is rigidly integrated with the simplified rear axle structure, and the steering knuckle arm hinge point is established. The aforementioned interference analysis method requires the establishment of a CAE model. The CAE model establishment method is as follows: constrain the six degrees of freedom on the vehicle frame, set the contact surface between the leaf spring and the vehicle frame as a sliding connection, fix the steering knuckle arm hinge point to the axle, apply the force and torque of the analysis condition to the axle, and obtain the three-dimensional coordinates of the steering knuckle arm hinge point under the analysis condition through CAE analysis.

2. The automotive suspension steering interference analysis method as described in claim 1, characterized in that: The interference analysis method requires interference quantity analysis. The interference quantity analysis method is as follows: take the projection of the center of the front hinge of the steering tie rod in the unloaded straight driving state onto the longitudinal symmetry plane of the vehicle as the center, and draw a circle with the line connecting the projection points of the front and rear hinge points on the plane as the radius. This circle is the motion trajectory of the steering knuckle arm hinge point without the constraint of the front axle. The coordinates of the steering knuckle arm hinge point obtained by CAE analysis are projected onto the plane. Connect the center of the steering knuckle arm hinge point under each working condition of CAE analysis with the center of the aforementioned trajectory circle. The distance between the line connecting the trajectory circle and the CAE analysis point in this direction is the suspension steering interference quantity under the analysis condition.

3. The automotive suspension steering interference analysis method as described in claim 2, characterized in that: In the aforementioned interference analysis method, the interference value is related to the elastic deformation and gap of the hinge point. Generally, an interference value within the range of 3 to 5 mm is considered to meet the requirements.

4. The automotive suspension steering interference analysis method as described in claim 2, characterized in that: The mounting shaft is a rotating shaft.

5. The automotive suspension steering interference analysis method as described in claim 2, characterized in that: The CAE model establishment method uses unloaded, half-loaded, and fully loaded driving and braking conditions for analysis.

6. The automotive suspension steering interference analysis method as described in claim 2, characterized in that: In the aforementioned interference analysis method, by sequentially connecting unloaded driving, half-loaded driving, fully loaded driving, unloaded braking, half-loaded braking, and fully loaded braking, the approximate motion trajectory following the leaf spring can be obtained.

7. The automotive suspension steering interference analysis method as described in claim 3, characterized in that: In the interference analysis method, when the interference exceeds the allowable range, the suspension and steering will be at risk of interference steering, requiring adjustment and optimization.

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