Method for eliminating abnormal sound of electrically-driven rear axle, electrically-driven rear axle and vehicle

Abstract

The invention discloses a method for eliminating abnormal sound of an electrically-driven rear axle, the electrically-driven rear axle and a vehicle, and relates to the technical field of vehicles, and the method comprises the steps of preparing a mixed lubricant, smearing the mixed lubricant and assembling a motor and the rear axle. In the step of preparing the mixed lubricant, the mixed lubricant comprises a lubricant and an additive, and the additive is one of graphite powder or metal powder; in the step of smearing the mixed lubricant, the mixed lubricant is uniformly smeared on the surface of an internal spline of a motor and the surface of an external spline of a rear axle; in the step of assembling the motor and the rear axle, the motor and the rear axle are in transmission connection through the internal spline and the external spline. The mixed lubricant formed by mixing the lubricant and the additive is evenly smeared on the surface of the internal spline of the motor and the surface of the external spline of the rear axle, the gap between the internal spline and the external spline in transmission connection can be filled, and therefore abnormal sound generated by the electrically-driven rear axle can be eliminated, the requirement for size precision of the internal spline and the external spline is lowered, and the service life of the motor is prolonged. And the assembling efficiency of the electrically-driven rear axle is improved.

Description

Technical Field

[0001] The present application relates to the field of vehicle technology, and more specifically, to a method for eliminating abnormal noise of an electric drive rear axle, an electric drive rear axle and a vehicle. Background Art

[0002] The electric drive rear axle of a vehicle is usually composed of a motor and a rear axle, and the motor and the rear axle are generally connected by an involute spline. When the machining dimensional accuracy of the inner and outer splines is low, the gap between the inner and outer splines will be large, which will cause the electric drive rear axle of the vehicle to produce abnormal noise. Therefore, the dimensional accuracy requirements for the inner and outer splines are relatively strict, resulting in low assembly efficiency of the electric drive rear axle.

[0003] Therefore, how to improve the assembly efficiency of the electric drive rear axle while eliminating the abnormal noise of the electric drive rear axle has become a technical problem that needs to be solved urgently by those skilled in the art. Summary of the invention

[0004] In view of this, the purpose of the present application is to provide a method for eliminating abnormal noise of an electric drive rear axle, so as to improve the assembly efficiency of the electric drive rear axle while eliminating the abnormal noise of the electric drive rear axle.

[0005] Another object of the present application is to provide an electric drive rear axle that adopts the above-mentioned method for eliminating abnormal noise of the electric drive rear axle.

[0006] Another object of the present application is to provide a vehicle having the above-mentioned electrically driven rear axle.

[0007] To achieve the above objectives, this application provides the following technical solutions:

[0008] A method for eliminating abnormal noise of an electric drive rear axle comprises the following steps:

[0009] preparing a mixed lubricant, wherein the mixed lubricant comprises a lubricant and an additive, wherein the additive is one of graphite powder or metal powder;

[0010] Applying the mixed lubricant, and evenly applying the mixed lubricant to the inner spline surface of the motor and the outer spline surface of the rear axle;

[0011] Assemble the motor and the rear axle, and connect the motor and the rear axle through the inner spline and the outer spline.

[0012] Optionally, in the above method for eliminating abnormal noise of an electric drive rear axle, the metal powder is one of copper powder or aluminum powder.

[0013] Optionally, in the above method for eliminating abnormal noise of an electrically driven rear axle, the lubricant is grease or high-strength glue.

[0014] Optionally, in the above method for eliminating abnormal noise of an electric drive rear axle, the step of preparing the mixed lubricant specifically includes:

[0015] Screening the additives: using a screen to screen the additives;

[0016] The additive and the lubricant are mixed, and the screened additive and the lubricant are stirred and mixed to form the mixed lubricant.

[0017] Optionally, in the above method for eliminating abnormal noise of an electrically driven rear axle, the specification of the sieve is 20 mesh to 200 mesh.

[0018] Optionally, in the above method for eliminating abnormal noise of an electric drive rear axle, the ratio between the weight of the lubricant and the weight of the additive is 1.5 to 2.5.

[0019] Optionally, in the above method for eliminating abnormal noise of an electrically driven rear axle, the inner spline and the outer spline are involute splines.

[0020] An electric drive rear axle adopts the method for eliminating abnormal noise of the electric drive rear axle as described in any one of the above items, comprising a motor and a rear axle, wherein the motor and the rear axle are connected by a spline transmission.

[0021] Optionally, in the above-mentioned electrically driven rear axle, a vibration reduction assembly for buffering and vibration reduction is arranged on the rear axle, and the vibration reduction assembly includes leaf springs and shock absorbers arranged on both sides of the rear axle.

[0022] A vehicle comprises the electric drive rear axle as described above.

[0023] The method for eliminating abnormal noise of the electric drive rear axle provided by the present application comprises the steps of preparing a mixed lubricant, applying the mixed lubricant and assembling the motor and the rear axle. Wherein, in the step of preparing the mixed lubricant, the mixed lubricant is mixed with a lubricant and an additive, and the additive is one of graphite powder or metal powder. Then, the prepared mixed lubricant is evenly applied to the inner spline surface of the motor and the outer spline surface of the rear axle, and then the motor and the rear axle are connected by the inner spline and the outer spline transmission, thereby completing the assembly of the electric drive rear axle. As can be seen from the above example, the method for eliminating abnormal noise of the electric drive rear axle provided by the present application, by evenly applying the mixed lubricant mixed with a lubricant and an additive to the inner spline surface of the motor and the outer spline surface of the rear axle, the gap between the inner spline and the outer spline transmission connection can be filled by the additive in the mixed lubricant, and the lubricant can play a role in lubrication and increasing the bonding force of the additive, thereby eliminating the abnormal noise caused by the large gap between the inner and outer splines of the electric drive rear axle, thereby reducing the dimensional accuracy requirements for the inner and outer splines, improving the assembly efficiency of the electric drive rear axle, and reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are merely embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0025] Figure 1 A flow chart of a method for eliminating abnormal noise of an electric drive rear axle provided in an embodiment of the present application;

[0026] Figure 2 A flow chart for preparing a mixed lubricant provided in an embodiment of the present application;

[0027] Figure 3 A schematic diagram of the structure of an electric drive rear axle provided in an embodiment of the present application;

[0028] Figure 4 The NVH equipment test results before applying the mixed lubricant provided in Example 1 of the present application;

[0029] Figure 5 The NVH equipment test results after applying the mixed lubricant provided in Example 1 of the present application;

[0030] Figure 6 The NVH equipment test results before applying the mixed lubricant provided in Example 2 of the present application;

[0031] Figure 7 The NVH equipment test results after applying the mixed lubricant provided in Example 2 of the present application;

[0032] Figure 8 This is a characteristic loudness curve of the abnormal sound in the driver's right ear provided in an embodiment of the present application.

[0033] Among them, 100 is the electric drive rear axle, and 10 is the rear axle;

[0034] 11 is a leaf spring, and 12 is a shock absorber. DETAILED DESCRIPTION

[0035] The core of the present application is to provide a method for eliminating abnormal noise of an electric drive rear axle, so as to improve the assembly efficiency of the electric drive rear axle while eliminating the abnormal noise of the electric drive rear axle.

[0036] Another core of the present application is to provide an electric drive rear axle that adopts the above-mentioned method for eliminating abnormal noise of the electric drive rear axle.

[0037] Another core of the present application is to provide a vehicle having the above-mentioned electric drive rear axle.

[0038] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0039] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. The terms used in the following embodiments are only for the purpose of describing specific embodiments and are not intended to be used as limitations on the present application. As used in the specification and the appended claims of the present application, the singular expressions "one", "a kind", "said", "above", "the" and "this" are intended to also include expressions such as "one or more", unless there is a clear contrary indication in the context. It should also be understood that in the embodiments of the present application, "one or more" refers to one, two or more; "and / or" describes the association relationship of the associated objects, indicating that three relationships may exist; for example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone, where A and B can be singular or plural. The character " / " generally indicates that the objects associated before and after are in an "or" relationship.

[0040] References to "one embodiment" or "some embodiments" etc. described in this specification mean that a particular feature, structure or characteristic described in conjunction with the embodiment is included in one or more embodiments of the present application. Thus, the phrases "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. that appear at different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "including", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized in other ways.

[0041] The multiple involved in the embodiments of the present application means greater than or equal to two. It should be noted that in the description of the embodiments of the present application, the words "first", "second", etc. are only used for the purpose of distinguishing the description, and cannot be understood as indicating or implying relative importance, nor can they be understood as indicating or implying an order.

[0042] The "parallel" and "perpendicular" involved in this application are "substantially parallel" and "substantially perpendicular" in actual operation. "Substantially parallel" can be understood as parallel with a certain error, and similarly, "substantially perpendicular" can be understood as perpendicular with a certain error.

[0043] The electric drive rear axle of new energy vehicles is usually composed of a motor and a rear axle, and the motor and the rear axle are generally connected by an involute spline. When the machining dimensional accuracy of the inner and outer splines is low, the gap between the inner and outer splines will be large, which will cause abnormal noise in the electric drive rear axle of the vehicle. Therefore, the dimensional accuracy requirements for the inner and outer splines are relatively strict, resulting in low assembly efficiency of the electric drive rear axle.

[0044] For this reason, Figure 1 As shown, the embodiment of the present application discloses a method for eliminating abnormal noise of an electric drive rear axle, including step S100 of preparing a mixed lubricant, step S200 of applying the mixed lubricant, and step S300 of assembling the motor and the rear axle. The mixed lubricant formed by mixing the lubricant and the additive is evenly applied to the inner spline surface of the motor and the outer spline surface of the rear axle 10, and the gap between the inner spline and the outer spline transmission connection can be filled by the additive in the mixed lubricant. At the same time, the lubricant can play a role in lubrication and increase the adhesion of the additive, thereby eliminating the abnormal noise generated by the electric drive rear axle 10 due to the large gap between the inner and outer splines, thereby reducing the dimensional accuracy requirements for the inner and outer splines, improving the assembly efficiency of the electric drive rear axle 10, and reducing costs.

[0045] The following will be combined Figures 1 to 8 The method for eliminating abnormal noise of the electric drive rear axle disclosed in the embodiment of the present application is specifically explained and illustrated.

[0046] Step S100, preparing a mixed lubricant;

[0047] The mixed lubricant may include a lubricant and an additive, and the mixed lubricant is formed by mixing the lubricant and the additive in a weight ratio of 1.5 to 2.5. Preferably, the lubricant and the additive are mixed in a weight ratio of 2:1, which can achieve a better lubrication effect while filling the gap between the inner and outer splines, thereby eliminating the abnormal noise of the electric drive rear axle.

[0048] For example, the additive can be one of graphite powder or metal powder, which can achieve better thermal conductivity while filling the gap between the inner and outer splines, improve the heat dissipation performance of the inner and outer splines, and ensure the stability of the electric drive rear axle transmission. Among them, the metal powder can be one of copper powder or aluminum powder, and the lubricant can be grease or high-strength glue, which can achieve better lubrication effect and increase the adhesion of the additive, ensuring that the additive can adhere to the gap between the inner and outer splines without scattering or flowing, which is conducive to filling the gap between the inner and outer splines and eliminating the abnormal noise of the electric drive rear axle.

[0049] like Figure 2 As shown, the step S100 of preparing the mixed lubricant may specifically include the step S101 of screening the additive and the step S102 of mixing the additive and the lubricant.

[0050] Step S101, screening additives;

[0051] The additive is screened by a screen, and the additive and lubricant after passing through the screen are mixed.

[0052] For example, since the gap between the inner and outer splines is small, the screen can be of a size of 20 to 200 mesh, thereby ensuring that the additive can better fill the gap between the inner and outer splines, eliminating the abnormal noise of the electric drive rear axle, and avoiding the situation where the additive particles are too large to fill the gap between the inner and outer splines or can fill the gap between the inner and outer splines, but there is still a small gap between the inner and outer splines, and the additive particles are too small, then the effect of filling the gap between the inner and outer splines is lost.

[0053] Step S102, mixing additives and lubricants;

[0054] After the additive is screened through the screen, the screened additive and the lubricant are uniformly stirred and mixed to form a final mixed lubricant.

[0055] Step S200, applying a mixed lubricant;

[0056] Apply the prepared mixed lubricant evenly to the surface of the inner and outer splines to fill the gap between the inner and outer splines when they are connected, thereby eliminating the abnormal noise of the motor-driven rear axle.

[0057] Exemplarily, the inner spline is located at the output end of the motor, and the outer spline is located at the input end of the rear axle 10. By evenly applying the mixed lubricant to the inner spline surface of the motor and the outer spline surface of the rear axle 10, when the motor and the rear axle 10 are connected by the inner spline and the outer spline, the gap between the inner and outer splines can be filled by the mixed lubricant, and the dimensional error caused by the inner and outer splines during processing can be compensated, so as to ensure the assembly accuracy between the motor and the rear axle 10 and eliminate the abnormal noise of the electric drive rear axle. Optionally, the inner spline and the outer spline can adopt involute splines, so that the center positioning of the inner spline and the outer spline is better when they are matched, and when the shaft is loaded, the effect of automatic adjustment can be achieved, thereby further ensuring a higher assembly accuracy.

[0058] Step S300, assembling the motor and the rear axle;

[0059] After the mixed lubricant is evenly applied to the inner spline surface of the motor and the outer spline surface of the rear axle 10, the motor and the rear axle 10 are connected by the inner spline and the outer spline transmission, thereby completing the assembly of the electric drive rear axle.

[0060] The method for eliminating abnormal noise of an electric drive rear axle provided in the present application includes step S100 of preparing a mixed lubricant, step S200 of applying the mixed lubricant, and step S300 of assembling a motor and a rear axle. Among them, in step S100 of preparing the mixed lubricant, the mixed lubricant is a mixture of a lubricant and an additive, and the additive is one of graphite powder or metal powder. Then, the prepared mixed lubricant is evenly applied to the inner spline surface of the motor and the outer spline surface of the rear axle 10, and then the motor and the rear axle 10 are connected by inner spline and outer spline transmission, thereby completing the assembly of the electric drive rear axle 10.

[0061] The method for eliminating abnormal noise of the electric drive rear axle 10 provided in the present application is to evenly apply a mixed lubricant formed by mixing a lubricant and an additive to the inner spline surface of the motor and the outer spline surface of the rear axle 10. The additive in the mixed lubricant can fill the gap between the inner spline and the outer spline transmission connection, and the lubricant can lubricate and increase the adhesion of the additive, thereby eliminating the abnormal noise generated by the electric drive rear axle 10 due to the large gap between the inner and outer splines, thereby reducing the dimensional accuracy requirements for the inner and outer splines, improving the assembly efficiency of the electric drive rear axle 10 and reducing costs.

[0062] like Figures 4 to 7 As shown in the figure, the present application tests the abnormal noise of the electric drive rear axle before and after applying the mixed lubricant under different working conditions through NVH equipment. Among them, when the vehicle speed is 45km / h to 50km / h, the abnormal noise of the electric drive rear axle before applying the mixed lubricant is as follows: Figure 4 As shown in the figure; the abnormal noise when the electric drive rear axle is released after applying the mixed lubricant, as shown in the figure Figure 5 When the vehicle speed is 50km / h to 55km / h, the electric drive rear axle makes abnormal noise when the pedal is released before applying the mixed lubricant, as shown in the figure below. Figure 6 As shown in the figure; the abnormal noise when the electric drive rear axle is released after applying the mixed lubricant, as shown in the figure Figure 7 As shown in the above example, under different vehicle speed conditions, the red area in the abnormal noise when the electric drive rear axle is released after the mixed lubricant is applied is significantly reduced, indicating that the abnormal noise when the electric drive rear axle is released after the mixed lubricant is applied is significantly improved compared with the abnormal noise when the electric drive rear axle is released before the mixed lubricant is applied.

[0063] At the same time, if Figure 8 As shown in the figure, the characteristic loudness of the abnormal sound in the driver's right ear has been reduced to varying degrees, with the maximum improvement being 18%. In the range of 800Hz to 1200Hz (6bark to 8bark), the maximum improvement in the characteristic loudness of the driver's right ear is 0.23sone / bark.

[0064] like Figure 3As shown, the embodiment of the present application also discloses an electric drive rear axle, which adopts the method for eliminating abnormal noise of the electric drive rear axle disclosed in the above embodiment, so the electric drive rear axle has all the technical effects produced by the above method for eliminating abnormal noise of the electric drive rear axle, which will not be described in detail herein. The electric drive rear axle may include a motor and a rear axle 10, and the motor and the rear axle 10 may be connected by a spline transmission.

[0065] like Figure 3 As shown, a vibration reduction assembly for buffering and vibration reduction may be provided on the rear axle 10. Exemplarily, the vibration reduction assembly may include leaf springs 11 and shock absorbers 12 provided on both sides of the rear axle 10, wherein three shock absorbers 12 may be provided, and two shock absorbers 12 may be provided on one side of the motor to ensure the stability of the electric drive rear axle and improve the buffering and vibration reduction performance of the electric drive rear axle. The specific assembly method of the shock absorber 12 may refer to the conventional assembly method of the electric drive rear axle, and will not be described in detail herein.

[0066] The embodiment of the present application further discloses a vehicle, including the electric drive rear axle 100 disclosed in the above embodiment, so the vehicle has all the technical effects of the above electric drive rear axle 100, which will not be described in detail herein.

[0067] The technical features mentioned above and the technical features shown individually in the drawings can be combined with each other arbitrarily, as long as the combined technical features are not contradictory. All feasible feature combinations are technical contents explicitly recorded in this article.

[0068] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for eliminating abnormal noise of an electric drive rear axle, characterized in that: Includes steps: preparing a mixed lubricant, wherein the mixed lubricant comprises a lubricant and an additive, wherein the additive is one of graphite powder or metal powder; Applying a mixed lubricant, and evenly applying the mixed lubricant to the inner spline surface of the motor and the outer spline surface of the rear axle (10); The motor and the rear axle are assembled, and the motor and the rear axle (10) are transmission-connected via the inner spline and the outer spline.

2. The method for eliminating abnormal noise of electric drive rear axle according to claim 1, characterized in that: The metal powder is copper powder or aluminum powder.

3. The method for eliminating abnormal noise of electric drive rear axle according to claim 1, characterized in that: The lubricant is grease or high-strength glue.

4. The method for eliminating abnormal noise of an electric drive rear axle according to claim 1, characterized in that: The step of preparing the mixed lubricant specifically includes: Screening the additives: using a screen to screen the additives; The additive and the lubricant are mixed, and the screened additive and the lubricant are stirred and mixed to form the mixed lubricant.

5. The method for eliminating abnormal noise of electric drive rear axle according to claim 4, characterized in that: The specification of the sieve is 20 meshes to 200 meshes.

6. The method for eliminating abnormal noise of an electric drive rear axle according to claim 1, characterized in that: The ratio between the weight of the lubricant and the weight of the additive is 1.5 to 2.

5.

7. The method for eliminating abnormal noise of an electric drive rear axle according to claim 1, characterized in that: The internal splines and the external splines are involute splines.

8. An electric drive rear axle, characterized in that: The method for eliminating abnormal noise of an electrically driven rear axle as claimed in any one of claims 1 to 7 comprises a motor and a rear axle (10), wherein the motor and the rear axle (10) are connected via a spline transmission.

9. The electric drive rear axle according to claim 8, characterized in that: The rear axle (10) is provided with a vibration reduction assembly for buffering and vibration reduction, and the vibration reduction assembly comprises a leaf spring (11) and a shock absorber (12) arranged on both sides of the rear axle (10).

10. A vehicle, characterized in that: Comprising the electric drive rear axle (100) as claimed in claim 8 or 9.

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