CN114970011A - Rigid bridge plate spring suspension DMU manufacturing and tire envelope generating method - Google Patents

Rigid bridge plate spring suspension DMU manufacturing and tire envelope generating method Download PDF

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Publication number
CN114970011A
CN114970011A CN202210491616.8A CN202210491616A CN114970011A CN 114970011 A CN114970011 A CN 114970011A CN 202210491616 A CN202210491616 A CN 202210491616A CN 114970011 A CN114970011 A CN 114970011A
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plate spring
rear axle
motion
rigid bridge
point
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江乐光
张小红
方宜学
李军
关永学
薛海涛
朱宇轩
朱蕾
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Jiangling Motors Corp Ltd
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Jiangling Motors Corp Ltd
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    • G06F30/10—Geometric CAD
    • G06F30/17—Mechanical parametric or variational design
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]
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    • G06F30/15—Vehicle, aircraft or watercraft design
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]
    • G06F30/20—Design optimisation, verification or simulation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract

The invention relates to a rigid bridge plate spring suspension DMU manufacturing and tire envelope generating method, which comprises the steps of simplifying a rigid bridge plate spring structure, guiding the simplified rigid bridge plate spring structure into CATIA software to obtain a plate spring equivalent model, further analyzing to obtain a motion trajectory line of a rear axle mounting point on a plate spring, obtaining a whole rear suspension DMU motion model according to the obtained motion constraint relation among a rear axle, a shock absorber, a frame and a rigid bridge plate spring, and generating rear wheel tire envelopes in the CATIA software or performing dynamic gap checking on relevant parts of a rear suspension. According to the method, the simplified equivalent model of the rigid bridge plate spring is used for obtaining the motion trajectory line of the plate spring under different working conditions and the DMU motion model of the rear suspension, and further the envelope surface of the rear wheel tire is generated.

Description

Rigid bridge plate spring suspension DMU manufacturing and tire envelope generating method
Technical Field
The invention relates to the technical field of automobile plate spring suspension DMU and tire envelope generation, in particular to a method for manufacturing a rigid bridge plate spring suspension DMU and generating a tire envelope.
Background
The independent suspension can simulate the motion principle of a connecting rod through CATIA software, simulate a suspended motion DMU through the motion relation between constraint rod systems, and can conveniently perform clearance check and tire envelope generation. However, when the rigid bridge is suspended behind, the plate spring deforms in the motion process, the deformation state of the rigid bridge cannot be simulated in an ADAMS or CATIA motion process, a series of checking works can be performed only according to different loading plate spring states, and the work is very complicated and inefficient.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a method for manufacturing a rigid bridge plate spring suspension DMU and generating tire envelopes.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for manufacturing a rigid bridge plate spring suspension DMU and generating tire envelopes comprises the following steps:
s1, simplifying a rigid bridge plate spring structure, and importing simplified plate spring structure data into CATIA software to draw to obtain a rigid bridge plate spring equivalent model;
s2, according to the equivalent model of the rigid bridge plate spring obtained in the step S1, further analyzing in CATIA software to obtain a motion trajectory line of a rear axle mounting point on the rigid bridge plate spring;
s3, obtaining a motion constraint relation among the rear axle, the shock absorber, the frame and the rigid bridge plate spring according to the motion trajectory line of the rear axle mounting point on the rigid bridge plate spring obtained in the step S2 to obtain a DMU motion model of the whole rear suspension;
and S4, generating a rear wheel tire envelope by using the rear suspension DMU motion model obtained in the step S3 and performing dynamic clearance check on relevant parts of the rear suspension.
Specifically, the process of simplifying the rigid bridge leaf spring structure in step S1 is as follows:
s11, setting a connecting point of a plate spring and a frame as a point A, simplifying the left side and the right side of a mounting surface of the plate spring and a rear axle into a point B and a point C, setting a connecting point of the plate spring and a plate spring lifting lug as a point D, and setting a connecting point of the plate spring lifting lug and the frame as a point E;
s12, simplifying the structure of the plate spring into a first plate spring main body AB section, a rear axle mounting BC section, a second plate spring main body CD section and a plate spring lifting lug DE section according to each point position set in the step S11; wherein, the AB section and the CD section are circular arc sections, and the BC section is a straight line section;
and S13, drawing a plate spring equivalent model in CATIA software according to the division of the position points and the structure of the plate spring in the steps S11 and S12.
Specifically, in step S2, the moving trajectory line of the rear axle mounting point on the rigid bridge leaf spring is further analyzed and obtained in the CATIA software, and the specific analysis process is as follows:
according to a plate spring equivalent model drawn in CATIA software, constraining the straight line segment BC to be tangent with the circular arc segments AB and CD, and when the arc height h of the plate spring is a certain value, obtaining the radius R corresponding to the circular arcs of the AB segment and the CD segment through the constraint relation among the segments of the plate spring equivalent model 1 、R 2 And central angle O 1 、O 2 Obtaining the position of a mounting point of the plate spring on the rear axle, obtaining the equivalent state of the plate spring and the mounting point of the plate spring on the rear axle under all working conditions by adjusting different arc height h values of the plate spring, and obtaining the motion trail of the plate spring on the mounting point of the rear axle after finishing; due to the rear wheelThe wheel center and the rear axle are relatively fixed, so that the motion track line of the mounting point of the plate spring on the rear axle is equivalent to the motion track line of the wheel center of the rear wheel.
Specifically, the step S3 of obtaining the motion constraint relationship between the rear axle, the shock absorber, the frame, and the rigid axle leaf spring includes: the motion constraint relation between the motion track lines of the rear axle and the mounting point and the motion constraint relation between the shock absorber, the rear axle and the frame.
Specifically, the process of generating the rear wheel tire envelope and performing dynamic clearance checking on the rear suspension related parts in step S4 is completed in the CATIA software.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a rigid bridge plate spring suspension DMU manufacturing and tire envelope generating method, which is characterized in that a rigid bridge plate spring suspension structure is simplified, the simplified plate spring suspension structure data is led into CATIA software to obtain a motion trajectory line of a rear axle mounting point on a rigid bridge plate spring, a rear axle, a shock absorber and a motion constraint relation between a frame and the rigid bridge plate spring are combined to obtain a whole rear suspension DMU motion model, and finally a rear wheel tire envelope surface is further generated in the CATIA software, and dynamic gap checking of relevant parts of the rear suspension is realized.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a flow chart of a rigid bridge leaf spring suspension DMU fabrication and tire envelope generation method of the present invention;
FIG. 2 is one of the schematic diagrams of a simplified process of the leaf spring structure in the embodiment of the present invention;
FIG. 3 is a second schematic view of the simplified process of the leaf spring structure in the embodiment of the present invention;
FIG. 4 is a third schematic view showing a simplified process of the leaf spring structure in the embodiment of the present invention;
FIG. 5 is a schematic diagram of a movement path line of a rear axle mounting point obtained in an embodiment of the present invention;
in the figure: 1. a shock absorber; 2. the motion trajectory line of the rear axle mounting point.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without any inventive step, are within the scope of the present invention.
Example (b): see fig. 1-5.
The invention provides a method for manufacturing a rigid bridge plate spring suspension DMU and generating tire envelopes, which comprises the following steps:
s1, simplifying a rigid bridge plate spring structure, and importing simplified plate spring structure data into CATIA software to draw to obtain a rigid bridge plate spring equivalent model;
s2, according to the equivalent model of the rigid bridge plate spring obtained in the step S1, further analyzing in CATIA software to obtain a motion trajectory line 2 of a rear axle mounting point on the rigid bridge plate spring;
s3, obtaining a motion constraint relation among the rear axle, the shock absorber, the frame and the rigid bridge plate spring according to the motion trajectory line of the rear axle mounting point on the rigid bridge plate spring obtained in the step S2 to obtain a DMU motion model of the whole rear suspension;
and S4, generating a rear wheel tire envelope by using the rear suspension DMU motion model obtained in the step S3 and performing dynamic clearance check on relevant parts of the rear suspension.
Specifically, the process of simplifying the rigid bridge leaf spring structure in step S1 is as follows:
s11, setting a connecting point of a plate spring and a frame as a point A, simplifying the left side and the right side of a mounting surface of the plate spring and a rear axle into a point B and a point C, setting a connecting point of the plate spring and a plate spring lifting lug as a point D, and setting a connecting point of the plate spring lifting lug and the frame as a point E;
s12, simplifying the structure of the plate spring into a first plate spring main body section AB, a rear axle mounting section BC, a second plate spring main body section CD and a plate spring lifting lug section DE according to each point position set in the step S11; wherein, the AB section and the CD section are circular arc sections, and the BC section is a straight line section;
and S13, drawing a plate spring equivalent model in CATIA software according to the division of the position points and the structure of the plate spring in the steps S11 and S12.
Furthermore, according to a plate spring equivalent model drawn in CATIA software, the constrained straight line segment BC is tangent to the arc segments AB and CD, and when the arc height h of the plate spring is a certain value, the radius R corresponding to the arcs of the AB segment and the CD segment can be obtained through the constrained relation among the segments of the plate spring equivalent model 1 、R 2 And central angle O 1 、O 2 Obtaining the position of a mounting point of the plate spring on the rear axle, obtaining the equivalent state of the plate spring and the mounting point of the plate spring on the rear axle under all working conditions by adjusting different arc height h values of the plate spring, and obtaining a motion trail 2 of the plate spring on the mounting point of the rear axle after finishing; the wheel center of the rear wheel is fixed relative to the rear axle, so that the motion track line of the mounting point of the plate spring on the rear axle is equivalent to the motion track line of the wheel center of the rear wheel.
The process of simplifying the structure of the plate spring and obtaining the movement track line of the wheel center of the rear wheel is further described by an example.
As shown in FIGS. 2-4, first, the leaf spring structure is simplified to obtain a leaf spring equivalent model, which is divided into L as shown in FIG. 3 1 、L 2 、L 3 Three of the formula, wherein L 1 、L 3 Is two circular arcs, L 2 For a straight line segment, the obtained equivalent model of the plate spring is specifically introduced as follows:
1) point A is the connection point of the plate spring and the frame, the relative position is fixed, the AB section is a circular arc, and the arc length I 1 Is a constant value, radius R 1 And the corresponding central angle O 1 Changes along with the change of the load borne by the leaf spring;
2) the BC section is a mounting surface of the upper rear axle of the plate spring and is a straight line section with fixed length;
3) the CD segment is a circular arc with an arc length I 2 Is a constant value, radius R 2 And the corresponding central angle O 2 Changes along with the change of the load borne by the leaf spring;
4) the DE section is a leaf spring lifting lug, the length is a fixed value, the point E is a connecting point of the lifting lug and the frame, and the DE section can rotate around the point E.
And then, obtaining a motion trajectory line of a rear axle mounting point on the plate spring by using the obtained plate spring equivalent model, wherein the specific process is as follows:
a. drawing a plate spring equivalent model in CATIA software;
b. constraining the straight line segment BC to be tangent to the arcs AB and CD;
c. as shown in FIG. 4, when the arc height h of the plate spring is a certain value, the radii R corresponding to the arcs of the AB section and the CD section are determined by the mutual constraint relationship between the equivalent models of the plate spring 1 、R 2 And central angle O 1 、O 2 The position O of the mounting point of the rear axle on the plate spring in the state can be determined;
d. the equivalent states of the plate springs under all working conditions can be obtained by adjusting the arc heights h of different plate springs, so that the mounting points of the upper rear axle of the plate springs, namely the movement locus 2 of the mounting points of the upper rear axle of the plate springs under all working conditions is obtained;
e. because the wheel center of the rear wheel is relatively fixed with the rear axle, the motion trail of the mounting point of the rear axle on the plate spring can be regarded as being equivalent to the motion trail line of the wheel center of the rear wheel.
As shown in fig. 5, finally, according to the trajectory of the rear axle mounting point on the plate spring, the motion relationship between the rear axle and the trajectory, and the motion relationship between the shock absorber 1 and the rear axle and the frame are further constrained to obtain the DMU motion model of the whole rear suspension, and then, according to the requirements, dynamic clearance checking can be performed on the relevant parts of the rear suspension, or a tire envelope of the rear wheel is generated.
In conclusion, the method simplifies the rigid bridge plate spring suspension structure, then introduces the simplified plate spring suspension structure data into CATIA software to obtain the motion trajectory line of the mounting point of the rear axle on the rigid bridge plate spring, then combines the motion constraint relation among the rear axle, the shock absorber, the frame and the rigid bridge plate spring to obtain the DMU motion model of the whole rear suspension, finally further generates the wrapping surface of the rear wheel tire in the CATIA software, and realizes dynamic clearance check on the relevant parts of the rear suspension.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the structure of the present invention in any way. Any simple modification, equivalent change and modification of the above embodiments according to the technical spirit of the present invention are within the technical scope of the present invention.

Claims (5)

1. A method for manufacturing a rigid bridge plate spring suspension DMU and generating tire envelope is characterized by comprising the following steps:
s1, simplifying a rigid bridge plate spring structure, and importing simplified plate spring structure data into CATIA software to draw to obtain a rigid bridge plate spring equivalent model;
s2, according to the equivalent model of the rigid bridge plate spring obtained in the step S1, further analyzing in CATIA software to obtain a motion trajectory line of a rear axle mounting point on the rigid bridge plate spring;
s3, obtaining a motion constraint relation among the rear axle, the shock absorber, the frame and the rigid bridge plate spring according to the motion trajectory line of the rear axle mounting point on the rigid bridge plate spring obtained in the step S2 to obtain a DMU motion model of the whole rear suspension;
and S4, generating a rear wheel tire envelope by using the rear suspension DMU motion model obtained in the step S3 and performing dynamic clearance check on relevant parts of the rear suspension.
2. The DMU manufacturing and tire envelope generating method for rigid axle leaf spring suspension according to claim 1, wherein the simplification process of rigid axle leaf spring structure in step S1 is as follows:
s11, setting a connecting point of a plate spring and a frame as a point A, simplifying the left side and the right side of a mounting surface of the plate spring and a rear axle into a point B and a point C, setting a connecting point of the plate spring and a plate spring lifting lug as a point D, and setting a connecting point of the plate spring lifting lug and the frame as a point E;
s12, simplifying the structure of the plate spring into a first plate spring main body AB section, a rear axle mounting BC section, a second plate spring main body CD section and a plate spring lifting lug DE section according to each point position set in the step S11; wherein, the AB section and the CD section are circular arc sections, and the BC section is a straight line section;
and S13, drawing a leaf spring equivalent model in CATIA software according to the division of the position points and the structure of the leaf spring in the steps S11 and S12.
3. The method for manufacturing a DMU suspended on a rigid bridge plate spring and generating a tire envelope as claimed in claim 1, wherein the moving trajectory of the rear axle mounting point on the rigid bridge plate spring is further analyzed in the CATIA software in step S2, and the specific analysis process is as follows:
according to a leaf spring equivalent model drawn in CATIA software, constraining a straight line segment BC to be tangent with arc segments AB and CD, when the arc height h of a leaf spring is a certain value, obtaining radiuses R1 and R2 and central angles O1 and O2 corresponding to arcs of the AB segment and the CD segment through the constraint relation among the segments of the leaf spring equivalent model, further obtaining the position of a mounting point of the leaf spring on a rear axle, obtaining the equivalent state of the leaf spring and the mounting point of the leaf spring on the rear axle under all working conditions by adjusting different arc height h values of the leaf spring, and obtaining the motion trail of the leaf spring on the mounting point on the rear axle after sorting; the wheel center of the rear wheel is fixed relative to the rear axle, so that the motion track line of the mounting point of the plate spring on the rear axle is equivalent to the motion track line of the wheel center of the rear wheel.
4. The method for manufacturing a DMU according to claim 1, wherein the step S3 of obtaining the motion constraint relationship between the rear axle, the shock absorber, the frame and the rigid axle leaf spring comprises: the motion constraint relation between the motion track lines of the rear axle and the mounting point and the motion constraint relation between the shock absorber, the rear axle and the frame.
5. The method of claim 1, wherein the steps of generating a tire envelope for the rear wheel and performing dynamic clearance checking on parts related to the rear suspension in step S4 are performed in CATIA software.
CN202210491616.8A 2022-05-07 2022-05-07 Rigid bridge plate spring suspension DMU manufacturing and tire envelope generating method Pending CN114970011A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116383973A (en) * 2023-06-05 2023-07-04 江铃汽车股份有限公司 CATIA-based light truck wheel single-side runout checking method and system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116383973A (en) * 2023-06-05 2023-07-04 江铃汽车股份有限公司 CATIA-based light truck wheel single-side runout checking method and system
CN116383973B (en) * 2023-06-05 2023-09-01 江铃汽车股份有限公司 CATIA-based light truck wheel single-side runout checking method and system

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