CN113753134A

CN113753134A - Engine timing cover, engine and automobile

Info

Publication number: CN113753134A
Application number: CN202111090441.1A
Authority: CN
Inventors: 郭林; 李云; 林伟雄; 胡锡挺; 冯驰; 陆韬
Original assignee: Dongfeng Liuzhou Motor Co Ltd
Current assignee: Dongfeng Liuzhou Motor Co Ltd
Priority date: 2021-09-16
Filing date: 2021-09-16
Publication date: 2021-12-07

Abstract

The invention discloses an engine timing cover cap, an engine and an automobile, wherein a noise reduction area is formed on the inner side surface of the engine timing cover cap, a plurality of noise reduction grooves are arranged at intervals in the noise reduction area, each noise reduction groove is arranged in a gradually reducing shape from the notch of the noise reduction groove to the bottom of the groove, because the noise reduction area is formed on the inner side surface of the engine timing cover, a plurality of noise reduction grooves are arranged at intervals in the noise reduction area, and each noise reduction groove is arranged in a gradually reducing shape from the notch of the noise reduction groove to the bottom of the groove, therefore, by utilizing the working principle of the acoustic black hole pit structure, namely utilizing the energy focusing principle of bending waves and designing the noise reduction groove, the propagation velocity of the bending wave transmitted into the structure can be gradually attenuated to zero, so that the suppression of the bending wave of the structure can be realized, therefore, the suppression of structural vibration and noise is realized, and the better isolation and suppression effects on the broadband noise source of the medium-low frequency band are realized in the working engineering of the engine.

Description

Engine timing cover, engine and automobile

Technical Field

The invention relates to the technical field of automobiles, in particular to an engine timing cover, an engine and an automobile.

Background

In the automobile pre-sale experience process, the most intuitive experience of a consumer is the automobile NVH (noise, vibration and harshness) performance. The timing cover is used as the largest thin-wall part of the engine, and the design process needs to consider multi-field performances such as light weight, reliability, NVH performance and the like. At present, a flat plate structure is mostly adopted for the timing cover of the engine, and the rigidity and the mode of the timing cover are improved by increasing the thickness or designing ribs, chamfers, shapes and the like. However, such a structure can only increase the rigidity of the timing cover while reducing the weight to a certain extent to achieve the noise reduction effect, but the noise reduction effect is limited.

Disclosure of Invention

The invention mainly aims to provide an engine timing cover, an engine and an automobile, and aims to improve the noise reduction effect while ensuring the strength of the timing cover.

In order to achieve the purpose, the engine timing cover cap provided by the invention is characterized in that a noise reduction area is formed on the inner side surface of the engine timing cover cap, the noise reduction area is provided with a plurality of noise reduction grooves which are arranged at intervals, and each noise reduction groove is arranged in a tapered shape from the notch of the noise reduction groove to the bottom of the groove.

Optionally, the plurality of noise reduction grooves includes a first groove disposed in a cone shape.

Optionally, the first grooves are provided in plurality, and the plurality of first grooves include a secondary groove with a smaller groove cross section and a primary groove with a larger groove cross section, and the secondary groove is arranged on the peripheral side of the primary groove; or the like, or, alternatively,

the first grooves comprise secondary grooves with smaller groove sections and main grooves with larger groove sections, and the secondary grooves and the main grooves are alternately distributed.

Optionally, the first groove is arranged as a conical groove, the notch radius of the main groove is R1, and the notch radius of the secondary groove is R2, wherein R2 is more than or equal to 0.5cm and less than or equal to R1 and less than or equal to 1 cm; and/or the presence of a gas in the gas,

the depth of the main groove is H1, the depth of the secondary groove is H2, H1 is not less than 1cm and not more than 2cm, and H2 is not less than 1cm and not more than 2 cm.

Optionally, the first groove is arranged as a conical groove, a generatrix length L1 of the side wall of the main groove and a generatrix length L2 of the side wall of the secondary groove are provided, wherein L1 is greater than or equal to 1cm and less than or equal to 2.5cm, and L2 is greater than or equal to 1cm and less than or equal to 2.5 cm.

Optionally, in two adjacent noise reduction grooves, a distance D between the two adjacent noise reduction grooves along the spacing direction of the two noise reduction grooves is S, and the distance between two opposite side walls of the noise reduction groove is greater than or equal to 2S.

Optionally, the engine timing cover is made of aluminum or PA66 GF 30.

Optionally, the inner side surface of the engine timing cover is formed with a mounting area outside the noise reduction area, and the mounting area is provided with a reinforcing rib.

In order to achieve the purpose, the engine provided by the invention comprises an engine timing cover cap, wherein a noise reduction area is formed on the inner side surface of the engine timing cover cap, the noise reduction area is provided with a plurality of noise reduction grooves which are arranged at intervals, and each noise reduction groove is arranged in a tapered shape from the notch of the noise reduction groove to the bottom of the groove.

In order to achieve the purpose, the automobile provided by the invention comprises an engine, wherein the engine comprises an engine timing cover cap, a noise reduction area is formed on the inner side surface of the engine timing cover cap, the noise reduction area is provided with a plurality of noise reduction grooves which are arranged at intervals, and each noise reduction groove is arranged in a tapered shape from the notch of the noise reduction groove to the bottom of the groove.

In the technical scheme provided by the invention, the noise reduction area is formed on the inner side surface of the engine timing cover, the noise reduction areas are provided with a plurality of noise reduction grooves which are arranged at intervals, and each noise reduction groove is arranged in a tapered shape from the notch of the noise reduction groove to the bottom of the groove, so that the propagation speed of bending waves transmitted into the structure can be gradually attenuated to zero by utilizing the working principle of an acoustic black hole pit structure, namely the energy focusing principle of the bending waves and designing the noise reduction grooves, thereby realizing the inhibition of the structural bending waves, realizing the inhibition of structural vibration and noise, further having better isolation and inhibition effects on broadband noise sources of medium and low frequency bands in the working engineering of the engine, and simultaneously lightening the weight of the engine timing cover.

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 described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

FIG. 1 is a schematic view of an embodiment of an engine timing cover provided by the present invention;

FIG. 2 is a schematic sectional view taken along line A-A of FIG. 1;

FIG. 3 is a schematic cross-sectional view taken at B-B in FIG. 1;

FIG. 4 is a schematic cross-sectional view at C-C of FIG. 1;

FIG. 5 is a schematic cross-sectional view taken at D-D in FIG. 1;

FIG. 6 is a schematic cross-sectional view taken at E-E of FIG. 1;

FIG. 7 is a schematic cross-sectional view taken at F-F in FIG. 1;

FIG. 8 is a schematic sectional view taken at G-G in FIG. 1;

FIG. 9 is a graph of energy transfer loss for the primary groove of FIG. 1 at a first depth;

FIG. 10 is a graph of energy transfer loss for the primary groove of FIG. 1 at a second depth;

FIG. 11 is a graph of energy transfer loss for the minor groove of FIG. 1 at a first depth;

FIG. 12 is a graph of energy transfer loss for the secondary groove of FIG. 1 at a second depth;

fig. 13 is a graph showing energy transfer loss of the noise reduction groove of fig. 1.

The reference numbers illustrate:

reference numerals	Name (R)	Reference numerals	Name (R)
				100	Engine timing cover	12	Main groove
1	Noise reduction groove	2	Reinforcing rib
				11	Minor groove

The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.

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.

It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.

In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.

Fig. 1 to 8 are schematic views of an embodiment of the engine timing cover provided by the present invention.

Referring to fig. 1, a noise reduction area is formed on the inner side surface of the engine timing cover 100, the noise reduction area is provided with a plurality of noise reduction grooves 1 arranged at intervals, and each noise reduction groove 1 is arranged in a tapered shape from the notch of the noise reduction groove 1 to the bottom of the groove.

In the technical scheme provided by the invention, as the noise reduction area is formed on the inner side surface of the engine timing cover cap 100, the noise reduction grooves 1 which are arranged at intervals are arranged in the noise reduction area, and each noise reduction groove 1 is arranged in a tapered shape from the notch of the noise reduction groove 1 to the bottom of the groove, so that the propagation speed of the bending wave transmitted into the structure can be gradually attenuated to zero by designing the noise reduction grooves 1 by utilizing the working principle of an acoustic black hole pit structure, namely utilizing the energy focusing principle of the bending wave, thereby realizing the inhibition of the structural bending wave, realizing the inhibition of structural vibration and noise, further having better isolation and inhibition effects on broadband noise sources of medium and low frequency bands in the engine working engineering, and simultaneously lightening the weight of the engine timing cover cap 100.

Specifically, referring to fig. 1 to 8, in the embodiment of the present application, the plurality of noise reduction grooves 1 include first grooves arranged in a cone shape, so that the structure is simple and the processing is convenient.

The mode of improving the noise reduction effect to different frequency noises has a plurality ofly, in an embodiment, refer to fig. 2, first recess sets up a plurality ofly, and is a plurality of including the minor recess 11 that the notch cross-section is less and the great main recess 12 of notch cross-section in the first recess, minor recess 11 is located the week side of main recess 12, so set up, has improved the noise reduction effect to different frequency noises.

The noise reduction effect for different frequencies can be improved in various ways, in another embodiment, the plurality of first grooves include secondary grooves 11 with smaller groove sections and main grooves 12 with larger groove sections, and the secondary grooves 11 and the main grooves 12 are alternately arranged, so that the noise reduction effect for different frequencies is improved.

The conical grooves comprise pyramid-shaped grooves and conical grooves, specifically, in the embodiment of the application, the first grooves are arranged to be conical grooves, the radius of the notch of the main groove is R1, the radius of the notch of the secondary groove is R2, wherein R2 is not less than 0.5cm and not more than R1 is not less than 1cm, and by arranging the first grooves with different radii, noise reduction of noise with different frequencies can be realized.

Specifically, the depth of the main groove is H1, the depth of the secondary groove is H2, H1 is not less than 1cm and not more than 2cm, H2 is not less than 1cm and not more than 2cm, and through the arrangement of the first grooves with different depths, noise reduction of noise with different frequencies is achieved.

It should be noted that, when the radii and depths of the primary groove 12 and the secondary groove 11 satisfy the above conditions at the same time, the noise cancellation effect is better.

Specifically, the first groove is a conical groove, the bus length L1 of the side wall of the main groove and the bus length L2 of the side wall of the secondary groove are equal to or greater than 1cm and equal to or less than 2.5cm, and the bus length L2 is equal to or greater than 1cm and equal to or less than 2.5 cm.

Specifically, referring to fig. 1 to 8, in a structural plan view, the first grooves are conical grooves, and when the structure is designed, based on the main grooves, the first grooves are uniformly distributed in the noise reduction area in a layout of 4 rows and 6 lines, and then the secondary grooves are uniformly distributed in a layout of 3 rows and 7 lines at the intersection of the circle center connecting line of the main grooves, so that acoustic black hole structures in 7 rows and 13 lines are formed in the noise reduction area on the inner side surface of the engine timing cover. The first noise reduction groove in the depth of each row of noise reduction grooves is Ha, the second noise reduction groove is Hb, Ha and Hb are sequentially and repeatedly arranged in an alternating mode (it needs to be noted that Ha and Hb indicate that the first noise reduction groove in the depth of each row of noise reduction grooves is different from the second noise reduction groove in the depth of each row of noise reduction grooves). The acoustic black hole structure can greatly attenuate the propagation speed of bending waves in the structure by utilizing the energy focusing mechanism of the bending waves and through the artificial structure size (the radius of the base circle of the conical groove, the height of the cone and the generatrix of the cone) and the periodic arrangement mode, so that the forbidden band of corresponding frequency is realized, and the inhibition of structural vibration and noise is realized.

In order to ensure the strength of the engine timing cover 100, referring to fig. 1 to 8, in two adjacent noise reduction grooves 1, along the spacing direction of the two noise reduction grooves 1, the distance D between the two adjacent noise reduction grooves 1 is S, and the distance between two opposite side walls of the noise reduction grooves 1 is S, wherein D is greater than or equal to 2S.

It should be noted that the engine timing cover 100 may be made of various materials, such as cast iron, alloy, stainless steel, etc., and specifically, in the embodiment of the present application, the material of the engine timing cover 100 is aluminum or PA66 GF30, so that sufficient strength of the engine timing cover 100 is ensured while noise is reduced.

Referring to fig. 1, an installation area outside the noise reduction area is formed on the inner side surface of the engine timing cover 100, and the installation area is used for installing a central electromagnet for supplying and exhausting air, so that the installation area has sufficient strength and good effect by arranging the reinforcing ribs 2 on the installation area.

It should be noted that, because the engine timing cover cap is only provided with the noise reduction groove in the noise reduction area, the overall rigidity of the engine timing cover cap can be effectively improved, and the timing cover cap has excellent structural strength while meeting the noise reduction function.

Referring to fig. 9 to 10, it can be seen from fig. 9 that the main groove has a good noise reduction effect between 805 and 830 for the noise frequency at the first depth, and it can be seen from fig. 10 that the main groove has a good noise reduction effect between 730 and 805 for the noise frequency at the second depth, wherein the second depth is greater than the first depth. As can be seen from fig. 11, the noise reduction effect of the secondary groove at the first depth is good for the noise frequency between 690 and 715, and as can be seen from fig. 12, the noise reduction effect of the primary groove at the second depth is good for the noise frequency between 620 and 670, wherein the second depth is greater than the first depth.

The invention further provides an engine, which comprises the engine timing cover 100, wherein the engine timing cover 100 adopts all the technical solutions of the embodiments, so that the technical effects brought by the technical solutions of the embodiments are also achieved, and detailed description is omitted.

The invention further provides an automobile which comprises the engine, wherein the engine comprises the engine timing cover 100 and adopts all the technical schemes of the embodiments, so that the technical effects brought by the technical schemes of the embodiments are also achieved, and the details are not repeated.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. The engine timing cover cap is characterized in that a noise reduction area is formed on the inner side face of the engine timing cover cap, a plurality of noise reduction grooves are arranged at intervals in the noise reduction area, and each noise reduction groove is gradually reduced in the direction from the groove opening of the noise reduction groove to the groove bottom.

2. The engine timing cover of claim 1, wherein said plurality of noise reduction grooves includes a first groove disposed in a conical shape.

3. The engine timing cover according to claim 2, wherein said first grooves are provided in plurality, and a plurality of said first grooves include a secondary groove having a smaller groove cross section and a primary groove having a larger groove cross section, said secondary groove being provided on a peripheral side of said primary groove; or the like, or, alternatively,

4. The engine timing cover as set forth in claim 3, wherein said first groove is provided as a conical groove, the notch radius of said primary groove is R1, and the notch radius of said secondary groove is R2, wherein 0.5cm R2R 1cm 1 cm; and/or the presence of a gas in the gas,

5. The engine timing cover as set forth in claim 3, wherein said first groove is provided as a conical groove, a generatrix length L1 of a side wall of said main groove and a generatrix length L2 of a side wall of said sub groove, wherein 1cm L1 is 2.5cm, and 1cm L2 is 2.5 cm.

6. The engine timing cover as set forth in claim 1, wherein a distance D between two noise reduction grooves of two adjacent noise reduction grooves in a direction of spacing between the two noise reduction grooves is S between opposite sidewalls of the noise reduction grooves, wherein D ≧ 2S.

7. The engine timing cover of claim 1, wherein said engine timing cover is made of aluminum or PA66 GF 30.

8. The engine timing cover according to claim 1, wherein an inner side surface of said engine timing cover is formed with a mounting area outside said noise reduction area, said mounting area being provided with a reinforcing rib.

9. An engine comprising an engine timing cover as claimed in any one of claims 1 to 8.

10. A vehicle comprising the engine of claim 9.