CN115791216A - Durability verification method for new energy Picard electric-driven rear axle abutment - Google Patents
Durability verification method for new energy Picard electric-driven rear axle abutment Download PDFInfo
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- CN115791216A CN115791216A CN202211570126.3A CN202211570126A CN115791216A CN 115791216 A CN115791216 A CN 115791216A CN 202211570126 A CN202211570126 A CN 202211570126A CN 115791216 A CN115791216 A CN 115791216A
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Abstract
The invention relates to a durability verification method for a new energy Picard electric-driven rear axle abutment, which comprises the following steps of: s101: preparing a sample piece; s102: designing a test; s103: building a test bench; s104: confirming the posture of the test bed; s105: judging; s106: road spectrum wheel core load; s107: and (4) testing.
Description
Technical Field
The invention relates to the technical field of automobiles, in particular to a durability verification method for a new energy Picard electric drive rear axle abutment.
Background
With the improvement of national requirements on energy conservation and emission reduction and the fierce competition of the automobile industry, how to use experiments to verify the design of an electric drive axle system and realize the light weight of the electric drive axle system reaches the increasingly strict national regulation and rule requirements becomes a key factor. The electric drive axle system is a core part of an electric automobile, and the strength and durability of the electric drive axle are foundation stones for ensuring the light weight of the drive axle. Therefore, a comprehensive and scientific bench durability test method is particularly important.
At present, in the process of project development of each host factory, three types of methods are mainly applied to carry out strength endurance experiments on electric drive bridges: 1. the durability evaluation method of the electrically-driven rear axle is based on three durability methods of a vertical bending fatigue test, a brake fatigue and a transverse fatigue specified by national standards (QC/T533-2020 commercial vehicle drive axle assembly), sinusoidal loads are loaded only at a leaf spring seat and a wheel center of the electrically-driven rear axle, the condition that the load of a shock absorber limiting block is not accordant with the actual stress is ignored, and the test period is one week. 2. Loading road spectrums on four wheel centers of a vehicle based on a complete vehicle four-upright-column bench experiment table, collecting endurance loads, namely 24-channel force and torque loads, iterating complete vehicle road test loads, and verifying the endurance performance of an electrically driven rear axle; the method has high precision, but has the biggest defects that a vehicle in a designed state and a real vehicle are required to collect the wheel center road spectrum load, the experimental period of three weeks and four weeks, the investment of tools and the higher cost of the test are required, and the whole vehicle is not produced in the early stage of the design of the electrically driven rear axle. 3. Based on the whole vehicle endurance test, the method is the most accurate test verification method, but the method has the greatest defects that a new vehicle needs to be completed, the cost is high, and the test period reaches four months to five months. In view of this, the present application is specifically proposed.
Disclosure of Invention
The invention provides a durability verification method for a new energy Picard electric drive rear axle abutment, which can accurately reflect all stresses of an electric drive rear axle; only the rear axle chassis part needs to be electrically driven, and the whole vehicle is not needed; the test period is shortened to two weeks while the precision is ensured.
The technical purpose of the invention is realized by the following technical scheme:
a durability verification method for a new energy Picard electric-driven rear axle abutment comprises the following steps:
s101: preparing a sample piece;
s102: designing a test;
s103: building a test bench;
s104: confirming the posture of the test bed;
s105: judging;
s106: road spectrum wheel core load;
s107: and (4) testing.
Further, in S101, the sample piece includes an electrically driven rear axle assembly, a leaf spring assembly, a damper assembly, and a leaf spring stopper.
Further, in S102, the test aims to replace the whole vehicle endurance test with a long period by a system rack and ensure that the test results are consistent; therefore, a test tool needs to be designed to equivalently replace the state of the whole vehicle, and the equivalence and the result consistency of the test tool and the state of the whole vehicle are ensured; namely, a leaf spring equivalent installation tool, a shock absorber and a leaf spring limiting block installation support tool are needed to be designed in the test, and supports for restraining a leaf spring, the shock absorber and a leaf spring limiting block are used; meanwhile, a tool convenient for loading is designed at the wheel center.
Further, in step S103, the electric drive rear axle assembly, the plate spring assembly, the shock absorber, the plate spring limiting block and the test tool are assembled together, and each bolt is driven to set a torque.
Further, in S104, based on the built electric drive rear axle system test bench, a vertical gap between the electric drive rear axle assembly and the plate spring limiting block is measured, and the system bench and the whole vehicle are confirmed to be consistent in posture, so that the same stress of the test and the whole vehicle is ensured.
Further, in S105: the vertical gap between the electric drive rear axle assembly and the plate spring limiting block is different from the gap of the whole vehicle state, the installation position of the plate spring limiting block of the system rack needs to be corrected, and the consistency of the gap is ensured.
Further, in S106, based on the wheel center road spectrum load of the whole vehicle endurance test field acquired by the earlier-stage project mule sample vehicle, the wheel center road spectrum time domain load is loaded to the rack wheel center tool.
Further, in S107, the working conditions of the bench test are respectively timed and tested according to the test specification of the whole vehicle endurance test field; and simultaneously monitoring a test result and making a test record.
The beneficial effects of the invention include:
the method accurately reflects the stress of all hard points of the electrically driven rear axle; .
Only the system rack of the electric drive rear axle assembly, the plate spring assembly, the shock absorber and the plate spring limiting block is required to be built, and the whole vehicle is not required.
The test period is shortened to two weeks while the test precision is ensured.
The number of times of endurance tests of the whole automobile is reduced, the expensive test site cost of the endurance tests of the whole automobile is saved, the huge investment of modifying a mould and redesigning due to the failure of an electrically-driven bridge system is reduced, the development cost is saved, the reliability of the electrically-driven bridge system is improved, and a new energy automobile with high reliability is provided.
Drawings
FIG. 1 is a flow chart of the steps of the authentication method of the present invention;
FIG. 2 is a block diagram of a test stand;
FIG. 3 is a schematic distribution diagram of a constraint tool and a loading tool in a test bench;
FIG. 4 is a schematic view of the distribution of the restraining tool and the loading tool at another angle in the test bed;
FIG. 5 is a schematic view of a vertical gap between an electrically driven rear axle and a plate spring limit block in a test bed;
fig. 6 is a wheel center road spectrum load of the whole vehicle endurance test field based on project early-stage mule sample vehicle collection.
In the figure: a plate spring assembly 1; a shock absorber 2; an electrically driven rear axle assembly 3; a leaf spring stopper 4.
Detailed Description
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings in conjunction with the following detailed description. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
As shown in fig. 1-6, the invention discloses a durability verification method for a new energy Picard electric drive rear axle abutment, which comprises the following steps: firstly, building a rack model of an electrically-driven rear axle system, wherein the rack model comprises an electrically-driven rear axle assembly 3, a plate spring assembly 1, a shock absorber 2 and a plate spring limiting block 4; then fixing a front lug and a rear lifting lug in the plate spring assembly 1 on an equal-rigidity tool according to the state of the whole vehicle, and measuring the gap between a plate spring limiting block 4 and the central point of a plate spring to ensure that the postures of a rack and the real vehicle are consistent; and finally, loading the wheel center load to the wheel center of the rack according to the cycle times of the working condition road in the whole vehicle endurance standard based on the wheel center time domain load acquired by the mule vehicle in the earlier stage of the project, and performing an endurance test.
The method comprises the following specific steps:
s101: sample pieces for testing are prepared, wherein the sample pieces comprise an electric drive rear axle assembly 3, a plate spring assembly 1, a shock absorber 2 assembly and a plate spring limiting block 4.
S102: the test design aims to replace the long-period whole vehicle endurance test with a system rack and ensure the test results to be consistent; therefore, a test tool needs to be designed to equivalently replace the state of the whole vehicle, and the equivalence and the result consistency of the test tool and the state of the whole vehicle are ensured; namely, a leaf spring equivalent installation tool, a shock absorber and a leaf spring limiting block installation support tool are needed to be designed in the test, and supports for restraining a leaf spring, the shock absorber and a leaf spring limiting block are used; meanwhile, a tool convenient for loading is designed at the wheel center. Fig. 3 and 4 are schematic distribution diagrams of a constraint tool and a loading tool.
S103: the electric drive rear axle assembly 3, the plate spring assembly 1, the shock absorber 2, the plate spring limiting block 4 and the test tool are assembled together, and the set torque of each bolt is well driven.
S104: based on the built test bench of the electrically driven rear axle system, the vertical gap between the electrically driven rear axle assembly 3 and the plate spring limiting block 4 is measured, and the attitude of the system bench is confirmed to be consistent with that of the whole vehicle, so that the test stress is ensured to be the same as that of the whole vehicle.
S105: the vertical gap between the electrically driven rear axle assembly 3 and the plate spring limiting block 4 is different from the gap of the whole vehicle state, the limiting block mounting position of the system rack needs to be corrected, and the consistency of the gap is ensured.
S106: based on the wheel center road spectrum load of the whole vehicle endurance test field acquired by the mule sample vehicle in the early stage of the project, loading the wheel center road spectrum time domain load on the rack wheel center tool.
S107: according to the test specification of the whole vehicle endurance test field, the working conditions of the bench test are respectively tested in a timing mode; and simultaneously monitoring a test result, and making a test record.
The method accurately reflects the stress of all hard points of the electrically driven rear axle; only a system rack of the electric drive rear axle assembly, the plate spring assembly, the shock absorber and the plate spring limiting block is required to be built, and a whole vehicle is not required; the test period is shortened to two weeks while the test precision is ensured.
It should be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modifications, equivalents, improvements and the like which are made without departing from the spirit and scope of the present invention shall be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.
Claims (8)
1. The durability verification method for the new energy Picard electric-driven rear axle abutment is characterized by comprising the following steps of:
s101: preparing a sample piece;
s102: designing a test;
s103: building a test bench;
s104: confirming the posture of the test bed;
s105: judging;
s106: road spectrum wheel core load;
s107: and (4) testing.
2. The durability verification method for the new energy Picard electric drive rear axle abutment according to claim 1, characterized in that:
s101, the sample piece comprises an electric drive rear axle assembly, a plate spring assembly, a shock absorber assembly and a plate spring limiting block.
3. The durability verification method for the new energy Picard electric-driven rear axle abutment according to claim 1, characterized in that:
in S102, the test aims to replace the long-period whole vehicle endurance test with a system rack and ensure that the test results are consistent; therefore, a test tool needs to be designed to equivalently replace the state of the whole vehicle, and the equivalence and the result consistency of the test tool and the state of the whole vehicle are ensured; namely, a leaf spring equivalent installation tool, a shock absorber and a leaf spring limiting block installation support tool are needed to be designed in the test, and supports for restraining a leaf spring, the shock absorber and a leaf spring limiting block are used; meanwhile, a tool convenient for loading is designed at the wheel center.
4. The durability verification method for the new energy Picard electric-driven rear axle abutment according to claim 1, characterized in that:
and S103, assembling the electric drive rear axle assembly, the plate spring assembly, the shock absorber, the plate spring limiting block and the test tool together, and well driving each bolt to set torque.
5. The durability verification method for the new energy Picard electric-driven rear axle abutment according to claim 1, characterized in that:
and S104, measuring a vertical gap between the electrically-driven rear axle assembly and the plate spring limiting block based on the built electrically-driven rear axle system test bench, and confirming that the posture of the system bench is consistent with that of the whole vehicle so as to ensure that the test stress is the same as that of the whole vehicle.
6. The durability verification method for the new energy Picard electric-driven rear axle abutment according to claim 1, characterized in that:
in S105: the vertical gap between the electric drive rear axle assembly and the plate spring limiting block is different from the gap of the whole vehicle state, and the installation position of the plate spring limiting block of the system rack needs to be corrected to ensure the consistent gap.
7. The durability verification method for the new energy Picard electric-driven rear axle abutment according to claim 1, characterized in that:
and S106, loading the wheel center road spectrum time domain load on a rack wheel center tool based on the wheel center road spectrum load of the whole vehicle endurance test field acquired by the early-stage mule sample vehicle of the project.
8. The durability verification method for the new energy Picard electric drive rear axle abutment according to claim 1, characterized in that:
in S107, the working conditions of the bench test are respectively timed and tested according to the test specification of the whole vehicle endurance test field; and simultaneously monitoring a test result, and making a test record.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211570126.3A CN115791216A (en) | 2022-12-08 | 2022-12-08 | Durability verification method for new energy Picard electric-driven rear axle abutment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211570126.3A CN115791216A (en) | 2022-12-08 | 2022-12-08 | Durability verification method for new energy Picard electric-driven rear axle abutment |
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| CN115791216A true CN115791216A (en) | 2023-03-14 |
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| CN202211570126.3A Pending CN115791216A (en) | 2022-12-08 | 2022-12-08 | Durability verification method for new energy Picard electric-driven rear axle abutment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116337484A (en) * | 2023-05-30 | 2023-06-27 | 麦格纳动力总成(江西)有限公司 | Drive axle endurance test method, system, computer and readable storage medium |
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- 2022-12-08 CN CN202211570126.3A patent/CN115791216A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116337484A (en) * | 2023-05-30 | 2023-06-27 | 麦格纳动力总成(江西)有限公司 | Drive axle endurance test method, system, computer and readable storage medium |
| CN116337484B (en) * | 2023-05-30 | 2023-09-26 | 麦格纳动力总成(江西)有限公司 | Drive axle endurance test method, system, computer and readable storage medium |
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