CN107301300B - Method for determining turning radius of vehicle steering knuckle by using section method - Google Patents
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Abstract
The invention discloses a method for determining the turning radius of a vehicle steering knuckle by using a section method, which comprises the following steps: building a steering system structure model; establishing a geometric model of a right steering pull rod-knuckle under a full-load working condition; establishing a full-load working condition right steering knuckle rotary motion model; establishing a connecting line from a turning center point of the steering knuckle to the center of the spherical hinge according to the motion rule of the steering knuckle; and 4, determining the turning radius of the steering knuckle. The method adopts AUTOCAD software to establish a two-dimensional model according to a projection theory, and has the advantages of strong intuition, high efficiency and high precision.
Description
Technical Field
The invention relates to an automobile modeling and measuring technology, in particular to a method for determining the turning radius of a vehicle steering knuckle by using a section method.
Background
At present, the turning radius of the vehicle steering knuckle is determined by the following methods:
1) drawing method on paper: simulating the movement of the steering knuckle on a drawing according to a drawing geometric theory, and determining the turning radius of the steering knuckle. The method has strong intuition, but poor precision and low efficiency.
2) Functional method: and establishing a mathematical model for calculating the turning radius of the steering knuckle, and substituting the mathematical model into the initial condition for calculation. The method is time-consuming in modeling, low in efficiency, easy to make mistakes, poor in intuition, but high in precision.
3) CAE software method: and substituting the CAE software into the initial conditions for automatic calculation. The method has the characteristics of time consumption, poor intuition, easy error and high precision in CAE software learning.
Disclosure of Invention
The invention aims to provide a method for determining the turning radius of a vehicle steering knuckle by using a section method, which adopts AUTOCAD software to establish a two-dimensional model according to a projection theory, and has the advantages of strong intuition, high efficiency and high precision.
In order to achieve the above purpose, the solution of the invention is:
a method for determining a turning radius of a vehicle knuckle using a cross-sectional method, comprising the steps of:
step 3, establishing a full-load working condition right steering knuckle rotary motion model;
in the step 3, a connection line from the turning center point of the steering knuckle to the center of the spherical hinge is established according to the motion rule of the steering knuckle, wherein the turning center point of the steering knuckle is obtained by the following method: let AB denote the knuckle, and point B be the center of the ball joint, and use two intersecting straight lines l passing through point B2、l3A slope K representing a point B on which the point B turns around the king pin center line l1Rotating; the intersection line of the side plane A and the inclined plane K is called as a cross-over line l4(ii) a The cross section is taken through point A, and the cross section is a side vertical plane and is also vertical to the plane3The intersection line of the oblique line and the oblique plane K is called as a cross-over line l5(ii) a Thereby obtaining a turning center point G of the steering knuckle;
and 4, determining the turning radius of the steering knuckle.
The details of the step 1 are as follows: according to the three-view theory and the function and performance requirements of the steering system, a CAD model of the steering system structure is drawn according to a proper proportion, and the geometric shape, the size, the position and the mutual connection relation of the steering system parts are designed and expressed.
In the step 2, the right steering link and the knuckle are projected, three projection views are drawn, wherein the knuckle is represented by AB, the point B is the center of the spherical hinge, the right steering link is represented by TB, and the three points A, B, T are projected in the front view, the top view and the left view to obtain projection points.
In the step 4, the real length, namely the turning radius of the steering knuckle is obtained by using the projection of the connecting line from the turning center point of the steering knuckle to the center of the spherical hinge.
After the scheme is adopted, the invention has the following improvements:
(1) the invention provides a method for establishing a two-dimensional model of steering knuckle slewing motion, which simulates steering motion, adopts AUTO CAD software to establish a steering system full-load working condition right steering pull rod-steering knuckle geometric model and a right steering knuckle slewing motion model, and lays a foundation for calculating the slewing radius of a steering knuckle;
(2) the invention provides a method for calculating the central line l of a king pin1The method for making the intersection G with the inclined plane K is called 'section method', and the method makes the section according to the projection theory and solves the section intersection line l4And l5Therefore, the intersection point G is obtained, the intuition is strong, the efficiency is high, and the solving precision is high.
Drawings
FIG. 1 is a model diagram of a vehicle steering system architecture;
wherein fig. 1a is a front view, fig. 1b is a top view, and fig. 1c is a left side view;
1-steering wheel drive column, 2-column locknut, 3-steering wheel upper bracket, 4-steering wheel lower bracket, 5-bolt, 6-nut, 7-spacer, 8-steering wheel, 9-steering wheel locknut, 10-lock cylinder, 11-steering wheel column housing, 12-steering wheel column, 13-column locknut, 14-spline converter, 15-steering machine rack tie rod pin, 16-rack tie rod nut, 17-rack tie rod spacer, 18-steering rocker arm stand pin, 19-rocker arm stand pin nut, 20-rocker arm stand pin spacer, 21-steering rocker arm stand, 22-steering machine rack tie rod, 23-right steering rocker arm, 24-right steering tie rod, 25-right steering knuckle, 26-tie rod, 27-left knuckle, 28-left tie rod, 29-left steering rocker, 30-steering gear support, 31-steering gear support bolt, 32-steering gear support nut, 33-steering gear support gasket;
FIG. 2 is a geometric model diagram of a right steering tie rod-knuckle model under full load conditions, reflecting the geometric coupling relationship between the right steering tie rod 24 and the right knuckle 25;
wherein fig. 2a is a front view, fig. 2b is a left side view, and fig. 2c is a top view;
FIG. 3 is a diagram of a turning model of a right steering knuckle under a full-load condition;
wherein a) is a front view and b) is a left view.
Detailed Description
The technical solution and the advantages of the present invention will be described in detail with reference to the accompanying drawings.
The invention provides a method for determining the turning radius of a vehicle steering knuckle by using a section method, which comprises the following steps:
According to the three-view theory, the function and performance requirements of the steering system, a CAD model of the steering system structure is drawn according to a proper proportion, the geometric shape, the size, the position and the mutual connection relation of the steering system parts are designed and expressed, and the three-view CAD model can be matched with the model shown in figure 1.
In fig. 1, the kingpin center line is a center line of a push-pull rotation of the right knuckle 25 on the right tie rod 24, and the ball joint center is a ball joint center at the joint of the right knuckle 25 and the right tie rod 24.
The steering system works as follows: the driver drives the steering wheel 8 by hand to enable the steering system to input power, circular motion and torque, the steering wheel 8 transmits the motion and torque to the steering wheel column 12, the steering wheel column 12 transmits the motion and torque to the steering wheel transmission column 1, the steering wheel transmission column 1 transmits the motion and torque to the spline converter 14, the spline converter 14 transmits the motion and torque to the steering gear rack pull rod 22 through the steering gear, the steering gear rack pull rod 22 transmits the motion and torque to the right steering rocker arm 23, the right steering rocker arm 23 transmits the motion and torque to the tie rod 26 through the pin, the tie rod 26 transmits the motion and torque to the right steering pull rod 24 and the left steering pull rod 28 through the ball hinge, the right steering pull rod 24 transmits the motion and torque to the right steering knuckle 25 and the right steering wheel through the ball hinge, the left steering pull rod 28 transmits the motion and torque to the left steering knuckle 27 and the left steering wheel through the ball hinge, the left and right steering wheels move simultaneously to realize the steering of the automobile.
The slewing motion process of the steering knuckle is as follows: the right steering knuckle 25 rotates around the central line of the kingpin under the pulling of the right steering pull rod 24, and drives wheels fixed on the steering knuckle to steer.
According to the size and projection theory of the previous figure 1, the right steering pull rod and the steering knuckle are geometrically simplified by l1Shows the right wheel kingpin centerline, line AB (l)2) Showing a knuckle, by TB line (l)3) Showing a right steering tie rod. B represents the center of the spherical hinge, T represents the center of the spherical hinge at the inner end of the right steering pull rod 24, A represents the intersection point of the center line of the right wheel and the center line of the master pin of the right wheel, and a three-view projection is drawn as shown in figure 2, which reflects the geometric connection relationship between the right steering pull rod 24 and the steering knuckle 25.
In fig. 2, x, y, and z are coordinate axes, the origin of the coordinates is O, and the arrow indicates a positive direction. a is1、a2、a3Respectively, the projection points of the point a in the front view, the top view and the left view. b1、b2、b3Respectively, the projection points of the point B in the main view, the top view and the left view. t is t1、t2、t3The projected points of point T in the front, top and left views, respectively, α (°) is the kingpin centerline caster, positive clockwise, and β (°) is the kingpin centerline negative, positive clockwise.
Step 3, establishing a full-load working condition right steering knuckle rotary motion model
On the basis of FIG. 2, the steering knuckle AB is wound around the kingpin center line l according to the steering1Law of motion of rotation, using l passing through point B2、l3Two intersecting straight lines represent the slope K passing through point B, and point B is on the slope K around the king pin central line l during steering1Rotating; calculating the cross line l4The point A is taken as a cross section (parallel to the YOZ projection plane, called as a side plane), and the intersection line of the cross section and the inclined plane K is called as l4(ii) a Calculating the cross line l5The section taken through point A is perpendicular to both the YOZ projection plane (called the flank plane) and l3The intersection of the oblique line and the oblique plane K is called l5(ii) a Thereby finding the G point. The present invention is referred to as a cross-section method.
The right knuckle turning motion model is established as shown in fig. 3.
In FIG. 3,/1β, α, supra, m1、m3M points are respectively in the front view and the left viewProjection point on the graph, n1、n3The projection points, j, of the N points on the main view and the left view respectively1、j3The projection points of the J point on the main view and the left view, g1、g3Projection points of G points on the main view and the left view, a1、a3，b1、b3As before.
In FIG. 3, M is l2And l4N is l4And l5The vertical intersection of (a). J is l5And l3And (4) an intersection point. G is l1And l5The intersection of (a) represents the kingpin center line l1The intersection point with the inclined plane K.
BG in FIG. 3 is a line connecting the center point G of the knuckle's turn to the center B of the ball pivot.
Step 4, determining the turning radius of the steering knuckle
According to the projection theory, the projection of BG line on FIG. 3 is used to obtain its real length, which is the turning radius of the knuckle.
The method can be applied to the motion analysis of the design of an automobile steering system and the design of other mechanical systems, and the application scheme is given in the embodiment, for example, as shown in the table 1, and the parameters are the same as the parameters.
TABLE 1 calculation scheme and results for the turning radius of a certain vehicle knuckle
The above embodiments are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modifications made on the basis of the technical scheme according to the technical idea of the present invention fall within the protection scope of the present invention.
Claims (3)
1. A method for determining a turning radius of a vehicle knuckle using a cross-sectional method, comprising the steps of:
step 1, establishing a steering system structure model;
step 2, establishing a geometric model of the right steering pull rod-knuckle under the full-load working condition;
step 3, establishing a full-load working condition right steering knuckle rotary motion model;
in the step 3, a connection line from the turning center point of the steering knuckle to the center of the spherical hinge is established according to the motion rule of the steering knuckle, wherein the turning center point of the steering knuckle is obtained by the following method: let AB denote the knuckle, and point B be the center of the ball joint, and use two intersecting straight lines l passing through point B2、l3A slope K representing a point B on which the point B turns around the king pin center line l1Rotating; the intersection line of the side plane A and the inclined plane K is called as a cross-over line l4(ii) a The cross section is taken through point A, and the cross section is a side vertical plane and is also vertical to the plane3The intersection line of the oblique line and the oblique plane K is called as a cross-over line l5(ii) a Thereby obtaining a king pin central line l1A line of intersection l5The intersection point of the steering knuckle is a turning center point G;
step 4, determining the turning radius of the steering knuckle;
in the step 4, the real length, namely the turning radius of the steering knuckle is obtained by using the projection of the connecting line from the turning central point of the steering knuckle to the center of the spherical hinge.
2. A method of determining a radius of gyration of a vehicle steering knuckle using a cross-sectional method as set forth in claim 1, wherein: the detailed content of the step 1 is as follows: according to the three-view theory and the function and performance requirements of the steering system, a CAD model of the steering system structure is drawn according to a proper proportion, and the geometric shape, the size, the position and the mutual connection relation of the steering system parts are designed and expressed.
3. A method of determining a radius of gyration of a vehicle steering knuckle using a cross-sectional method as set forth in claim 1, wherein: in the step 2, the right steering tie rod and the steering knuckle are projected, three projection views are drawn, wherein the steering knuckle is represented by AB, the point B is the center of a spherical hinge, the right steering tie rod is represented by TB, and the three points A, B, T are projected on the front view, the top view and the left view to obtain projection points.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710537905.6A CN107301300B (en) | 2017-07-04 | 2017-07-04 | Method for determining turning radius of vehicle steering knuckle by using section method |
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| CN201710537905.6A CN107301300B (en) | 2017-07-04 | 2017-07-04 | Method for determining turning radius of vehicle steering knuckle by using section method |
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| CN107301300B true CN107301300B (en) | 2020-03-06 |
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| CN108229002B (en) * | 2017-12-29 | 2021-03-23 | 厦门理工学院 | Method for determining automobile steering angle based on three-dimensional modeling |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106874619A (en) * | 2017-03-08 | 2017-06-20 | 厦门理工学院 | A kind of prenex change determination method of automobile steering roller |
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| US8844953B2 (en) * | 2011-09-30 | 2014-09-30 | Accelerated Systems Inc. | Mechanical steering linkage for battery powered mower with zero turning radius |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106874619A (en) * | 2017-03-08 | 2017-06-20 | 厦门理工学院 | A kind of prenex change determination method of automobile steering roller |
Non-Patent Citations (2)
| Title |
|---|
| 基于PID控制的汽车主动横向稳定杆技术的研究;李真炎;《中国优秀硕士学位论文全文数据库 工程科技Ⅱ辑》;20151215(第12期);第C035-44页 * |
| 客车主销定位角和回正力矩的计算及关系;王一夫 等;《客车技术与研究》;20120625(第3期);第10-13页 * |
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