CN113283007B - Light truck transmission shaft arrangement checking method based on CATIA - Google Patents
Light truck transmission shaft arrangement checking method based on CATIA Download PDFInfo
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- CN113283007B CN113283007B CN202110555983.5A CN202110555983A CN113283007B CN 113283007 B CN113283007 B CN 113283007B CN 202110555983 A CN202110555983 A CN 202110555983A CN 113283007 B CN113283007 B CN 113283007B
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Abstract
The invention relates to the field of automobile design, in particular to a light truck transmission shaft arrangement checking method based on CATIA. The method comprises the following steps: (1) inputting related hard point data of a transmission shaft; (2) drawing a jumping curve of each working condition of the rear wheel; (3) forming a connecting straight line by taking hard points on the CATIA three-dimensional data as position manufacturing points; manufacturing a rear bridge output line; (4) in the CATIA assembly module, moving the straight line formed in the step (3) according to the working condition jumping curve in the step (2) by using an assembly command and connecting the straight line into a check line; (5) measuring and calculating transmission shaft checking data according to the checking line formed in the step (4); (6) and comparing and judging whether the design requirements are met. The invention can simplify a complex transmission system into points and straight lines, is convenient for checking each included angle of the transmission shaft in CATIA software, effectively improves the checking work efficiency and enables the design to be more stable.
Description
Technical Field
The invention relates to the field of automobile design, in particular to a light truck transmission shaft arrangement checking method based on CATIA.
Background
The transmission shaft is used as an important component of an automobile and plays a role in transmitting power. The structure is reasonable, the problems of vehicle starting jitter, high-speed noise, abnormal sound of the transmission shaft and the like can be solved, and meanwhile, the transmission efficiency and the service life of the transmission shaft are improved. For light truck type, the transmission shaft generally adopts a cross universal joint form, and in practical arrangement, each included angle of the transmission shaft is required to be as small as possible. The peripheral factors influencing the included angle of the transmission shaft are more. Whether the arrangement structure of the transmission shaft is reasonable or not is simply and accurately evaluated through the CATIA software checking method, the structural design efficiency of the transmission shaft can be improved, and the waste problem caused by repeated engineering schemes is reduced.
Disclosure of Invention
The invention aims to solve the problems and provides a light truck transmission shaft arrangement checking method based on CATIA. The specific technical scheme is as follows:
the light truck transmission shaft arrangement checking method based on the CATIA comprises the following steps:
(1) inputting transmission shaft related hard point data;
(2) drawing a jumping curve of each working condition of the rear wheel;
(3) forming a connecting straight line by taking hard points on the CATIA three-dimensional data as position manufacturing points; manufacturing a rear bridge output line;
(4) in the CATIA assembly module, moving the straight line formed in the step (3) according to the working condition jumping curve in the step (2) by using an assembly command and connecting the straight line into a check line;
(5) measuring and calculating transmission shaft checking data according to the checking line formed in the step (4);
(6) and comparing and judging whether the design requirements are met.
Further, the hard point data in the step (1) includes an intersection point E of a junction surface of the transmission and the parking brake and a crankshaft center line, an intersection point F of a junction surface of the parking brake and the universal joint fork and a crankshaft center line, a junction point G of the front universal joint fork and the transmission shaft, a middle support characteristic point H, a junction point J of the first transmission shaft and the second transmission shaft, a junction point K of the rear universal joint fork and the transmission shaft, a junction point M of the universal joint fork and the rear axle, a rear axle lower offset characteristic point N, and a rear downward inclination angle θ of the crankshaft center line of the engine1And rear axle elevation angle theta2。
Further, the run-out curves of the rear wheels in the step (2) under various working conditions comprise data of a down-run limit wheel core point, a no-load wheel core point, a full-load wheel core point and an up-run limit wheel core point.
Further, the step (3) is specifically: connecting points F and G into a straight line, connecting points G and J into a straight line, and connecting points K and M into a straight line KM; and (3) manufacturing a rear axle output axis, and manufacturing a straight line by taking the point H as a starting point, wherein the straight line is perpendicular to a mounting plane supported on the frame in the middle of the transmission shaft to form a bridge output axis HR, and the bridge output axis HR and the straight line KM are integrated.
Further: the step (4) specifically comprises the following steps:
the rear axle output axis HR moves to the position of the wheel core point of the rear wheel down-jump limit, the straight line KM also moves along with the rear axle output axis HR, and the points J and K are connected to form a straight line JK1；
The output axis of the rear axle moves HR to the position of the empty wheel core point of the rear wheel, the straight line KM moves along with the movement of the output axis of the rear axle, and the point J and the point K are connected again to form a straight line JK2；
The rear axle output axis HR moves to the position of the rear wheel full load wheel center point, the straight line KM moves along with the rear axle output axis HR, the point J and the point K are connected again, and a straight line JK is formed3；
The rear axle output axis HR moves to the position of the wheel core point of the upper jump limit of the rear wheel, the straight line KM moves along with the movement, the points J and K are connected again to form a straight line JK4。
Further, step (5)Specifically, the method comprises the steps of measuring the included angle of a transmission shaft; measuring the length of each section of the transmission shaft, and calculating the slippage of the spline of the transmission shaft; measuring angle theta of perpendicular lines of transmission shaft and intermediate support mounting surface3。
Further, the included angle of the transmission shaft including the included angle of the universal joint at the input end of the transmission shaft is set to be alpha1The angle of the middle end universal joint is set as alpha2The included angle of the universal joint at the output end of the transmission shaft is set to be alpha3The equivalent included angle of the transmission shaft is set as alphae；
The calculation formula of the equivalent included angle is as follows:
in the first joint, when the active fork is located in the plane of the axes of the shafts, the remaining joints are negative if the plane of the active fork coincides with the plane and is positive, and the plane is perpendicular to the plane.
Further, the checking requirement of the step (6) is as follows: alpha is alpha1、α2、α3The angle is less than 4 degrees when the vehicle is empty and fully loaded, the angle is less than 7 degrees when the vehicle is at the upper limit position, and the limit included angles of other working conditions are less than 15 degrees; and the equivalent included angle alpha is equal when the engine is empty and full loadeLess than 3 DEG theta3Less than 91.
The invention has the beneficial effects that: by adopting the method, the complex transmission system can be simplified into points and straight lines, so that each included angle of the transmission shaft can be checked conveniently in CATIA software, the checking work efficiency is effectively improved, and the design is more stable.
Drawings
FIG. 1 is a diagram of the positions of hard points and various measurement angles of a transmission shaft according to the present invention;
FIG. 2 is a perspective view of the hard point and each measurement angle position of the transmission shaft of the present invention;
FIG. 3 is a drawing illustrating a check line according to the present invention.
Detailed Description
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 only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The present embodiment takes the two-section type transmission shaft calibration method as an example
A method for checking each included angle of a transmission shaft based on CATIA software is used for rapidly evaluating whether the structural design of the transmission shaft is reasonable. Comprises the following steps
1. Drive shaft dependent hard point data entry, as shown in FIG. 1
The hard point data comprises an intersection point E of a joint surface of the gearbox and the parking brake and a central line of the crankshaft, an intersection point F of a joint surface of the parking brake and the universal joint fork and a central line of the crankshaft, a joint point G of the front universal joint fork and the transmission shaft, a middle support characteristic point H, a first transmission shaft intersection point J, a second transmission shaft intersection point J, a joint point K of the rear universal joint fork and the transmission shaft, a joint point M of the universal joint fork and the rear axle, a lower offset characteristic point N of the rear axle, and a rear lower inclination angle theta of the central line of the crankshaft of the engine1And rear axle elevation angle theta2。
2. And each working condition jumping curve of the rear wheel comprises data of a down-jumping limit wheel core point, a no-load wheel core point, a full-load wheel core point and an up-jumping limit wheel core point.
3. Dots are formed at hard dot positions such as F, G, H, J, K, M on the CATIA three-dimensional data, and dots F and G are connected to form a straight line, dots G and J are connected to form a straight line, and dots K and M are connected to form a straight line. And manufacturing a rear axle output axis. And (3) making a straight line by taking the point H as a starting point, wherein the straight line is vertical to a mounting plane supported on the frame in the middle of the transmission shaft to form a straight line HR. Wherein the rear axle output axis and the straight line KM are taken as a whole.
4. In the CATIA assembly module, an assembly command is used for moving the output axis of the rear axle to the position of a lower jump limit point of a rear wheel, a straight line KM is moved along with the output axis of the rear axle, and connection points J and K form a straight line JK1. Then the output axis of the rear axle is moved to the position of the empty wheel core point of the rear wheel, the straight line KM moves along with the empty wheel core point of the rear wheel, and the points J and K are connected again to form a straight line JK2. Then the output axis of the rear axle is moved to the position of the full-load wheel center point of the rear wheel, the straight line KM moves along with the output axis of the rear axle, and the point J is connected againAnd K, form a straight line JK3. Then the output axis of the rear axle is moved to the position of the wheel core point of the upper jump limit of the rear wheel, the straight line KM is moved along with the output axis of the rear axle, and the points J and K are connected again to form a straight line JK4. As shown in fig. 3
5. Measuring the included angle of a transmission shaft by using a CATIA measuring tool (1); (2) measuring the length of each section of the transmission shaft, and calculating the slippage of the spline of the transmission shaft; (3) and measuring the angle of the transmission shaft and the vertical line of the middle support mounting surface. And the records are arranged into the following table.
Phase angle: positive and negative
6. According to the data in the above table, α1、α2、α3The angle is less than 4 degrees when the engine is empty and fully loaded, the angle is less than 7 degrees when the engine is at the upper limit position, and the included angles of other working conditions are less than 15 degrees. And the equivalent included angle alpha is equal when the engine is empty and full loadeLess than 3. Theta.theta.3Less than 91 deg.. The structural design of the transmission shaft can be determined to meet the requirements, and the design of all peripheral boundary data is reasonable.
By adopting the method, the complex transmission system can be simplified into points and straight lines, so that the included angles of the transmission shaft can be checked conveniently in CATIA software, the checking work efficiency is effectively improved, and the design is more stable.
Although the preferred embodiments of the present patent have been described in detail, the present patent is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present patent within the knowledge of those skilled in the art.
Claims (3)
1. The light truck transmission shaft arrangement checking method based on the CATIA is characterized by comprising the following steps: the method comprises the following steps:
(1) inputting related hard point data of a transmission shaft, wherein the hard point data comprises an intersection point E of a joint surface of a gearbox and a parking brake and a central line of a crankshaft, an intersection point F of the joint surface of the parking brake and a universal joint fork and the central line of the crankshaft, and a front universal joint fork and a transmission shaftA joint point G of the moving shaft, a middle support characteristic point H, a first transmission shaft intersection point J, a joint point K of the rear universal joint fork and the transmission shaft, a joint point M of the universal joint fork and the rear axle, a lower offset characteristic point N of the rear axle, and a rear downward inclination angle theta of the central line of the crankshaft of the engine1And rear axle elevation angle theta2；
(2) Drawing a jumping curve of each working condition of the rear wheel, wherein the jumping curve of each working condition of the rear wheel comprises data of a down-jump limit wheel core point, a no-load wheel core point, a full-load wheel core point and an up-jump limit wheel core point;
(3) forming a connecting straight line by taking hard points on the CATIA three-dimensional data as position manufacturing points; manufacturing a rear bridge output line; connecting points F and G into a straight line, connecting points G and J into a straight line, and connecting points K and M into a straight line KM; manufacturing a rear axle output axis, manufacturing a straight line by taking a point H as a starting point, wherein the straight line is perpendicular to a mounting plane of the middle support of the transmission shaft on the frame to form a bridge output axis HR, and constructing the bridge output axis HR and the straight line KM into a whole;
(4) in the CATIA assembly module, moving the straight line formed in the step (3) according to the working condition jumping curve in the step (2) by using an assembly command and connecting the straight line into a check line, wherein the method specifically comprises the following steps: the rear axle output axis HR moves to the position of the rear wheel down-jump limit wheel core point, the straight line KM also moves along with the rear axle output axis HR, the connection points J and K are connected, and a straight line JK is formed1(ii) a The output axis of the rear axle moves HR to the position of the empty wheel core point of the rear wheel, the straight line KM moves along with the movement of the output axis of the rear axle, and the point J and the point K are connected again to form a straight line JK2(ii) a The rear axle output axis HR moves to the position of the rear wheel full load wheel center point, the straight line KM moves along with the rear axle output axis HR, the point J and the point K are connected again, and a straight line JK is formed3(ii) a The rear axle output axis HR moves to the position of the wheel core point of the upper jump limit of the rear wheel, the straight line KM moves along with the movement, the points J and K are connected again to form a straight line JK4；
(5) Measuring and calculating transmission shaft checking data according to the checking line formed in the step (4), wherein the transmission shaft checking data comprises a transmission shaft included angle; measuring the length of each section of the transmission shaft, and calculating the slippage of the spline of the transmission shaft; measuring angle theta of perpendicular lines of transmission shaft and intermediate support mounting surface3；
(6) And comparing and judging whether the design requirements are met.
2. The CATIA-based light truck transmission shaft arrangement checking method as claimed in claim 1, wherein: the included angle of the transmission shaft including the universal joint at the input end of the transmission shaft is set as alpha1The angle of the middle end universal joint is set as alpha2The included angle of the universal joint at the output end of the transmission shaft is set to be alpha3The equivalent included angle of the transmission shaft is set as alphae；
The calculation formula of the equivalent included angle is as follows:
in the first joint, when the active fork is located in the plane of the axes of the shafts, the remaining joints are negative if the plane of the active fork coincides with the plane and is positive, and the plane is perpendicular to the plane.
3. The CATIA-based light truck transmission shaft arrangement checking method as claimed in claim 2, wherein: the design requirement of the step (6) is as follows: alpha is alpha1、α2、α3The angle is less than 4 degrees when the vehicle is empty and fully loaded, the angle is less than 7 degrees when the vehicle is at the upper limit position, and the limit included angles of other working conditions are less than 15 degrees; and the equivalent included angle alpha is equal when the engine is empty and full loadeLess than 3 DEG theta3Less than 91.
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| CN113525560B (en) * | 2021-09-07 | 2022-09-20 | 奇瑞商用车（安徽）有限公司 | Automobile power transmission route arrangement method |
| CN114254433A (en) * | 2021-11-30 | 2022-03-29 | 江铃汽车股份有限公司 | Arrangement checking method, system and equipment of power transmission system based on CATIA |
| 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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