Engine noise test microphone fixing support

Abstract

The utility model provides a microphone fixing support for an engine noise test, which relates to the technical field of engine detection tools and comprises a base, a vertical rod is mounted in the center of the base, a cross rod is fixed at the top end of the vertical rod, a clamp is arranged at the front end of the cross rod, and a spline with a 45-degree tooth profile angle is arranged on the clamp. The cross rod is provided with a spline groove with a 45-degree tooth profile angle, the spline groove is matched with the spline with the 45-degree tooth profile angle, an auxiliary drop point rod is installed at the side end of the base, and scales are arranged on the auxiliary drop point rod. According to the bracket, the angle of the microphone can be adjusted through the spline with the 45-degree tooth profile angle, and the position of the microphone is mapped to the end part of the auxiliary drop point rod through the auxiliary drop point rod, so that the problem that the distance between microphones cannot be directly measured due to the limitation of the height of the bracket, and the precision of test data and the test efficiency are influenced is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of engine detection tooling, in particular to a fixing bracket for an engine noise test microphone. Background Technique

[0002] The noise (Noise), vibration (Vibration), and harshness (Harshness) of an automobile are collectively referred to as the NVH characteristics of the automobile, which is an important factor in measuring the design and manufacturing quality of the automobile. With the continuous improvement of people's environmental and health awareness, the comfort and quality of vehicles have received more and more attention. Vehicles with high noise and vibration not only cause sound pollution to the surrounding environment, but also harm the health of drivers and passengers. In the highly competitive automobile market, how to reduce the noise pollution of vehicles has become a new competition focus and technological development direction. At the same time, the increasingly strict automobile noise standards in the international market have set higher restrictions on vehicle access.

[0003] The NVH performance of a vehicle is becoming the most important performance index in the automobile R & D process. When testing the radiated noise of an engine, it is usually tested with a sound power meter at a distance of 1 m from the engine when the engine is running. Engine tests are generally carried out on a test bench in an engine anechoic chamber, and it is necessary to test the top, bottom, intake side, exhaust side, etc. of the engine. When arranging microphones using the nine-point method according to the engine test standard, it is necessary to arrange the microphones in the 45° direction of the test piece. If a conventional bracket is used to install the microphone for testing, it is necessary to use a turning ruler to measure the installation height of the microphone, and at the same time, a plumb bob is also needed to vertically position it, and the angle of the microphone cannot be accurately adjusted. This not only makes the engine noise test time-consuming and laborious, but also affects the accuracy of the test data. Content of the Utility Model

[0004] Aiming at the deficiencies of the prior art, the utility model provides a fixing bracket for an engine noise test microphone, which can solve the technical problem that the microphone fixing bracket in the prior art cannot accurately adjust the angle of the microphone.

[0005] To achieve the above object, the utility model provides the following technical solution: A fixing bracket for an engine noise test microphone, comprising a cross bar and a clamp. The connecting part of the clamp is provided with a spline with a 45° tooth profile angle. One end of the cross bar is installed on a vertical rod, and the other end is provided with a spline groove with a 45° tooth profile angle that is fitted with the spline with a 45° tooth profile angle. One end of the vertical rod is installed on a base.

[0006] Preferably, a hole is provided on the side of the base, and an auxiliary landing rod is inserted into the hole. Scale lines are provided on the auxiliary landing rod, and the outer diameter of the auxiliary landing rod is larger than the inner diameter of the hole.

[0007] Preferably, the spline with a 45° tooth profile angle is embedded in the spline groove with a 45° tooth profile angle and fastened by a first bolt and a nut.

[0008] Preferably, the vertical rod comprises two or more joint rods connected by a sleeve. The inner walls at both ends of the sleeve are provided with first threaded holes, and the end surfaces of the joint rods are machined with threads mating with the first threaded holes.

[0009] Preferably, a second threaded hole mating with the thread at the end of the joint rod is provided at the center of the top of the base.

[0010] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0011] (1) The present utility model provides a fixing bracket for an engine noise test microphone. The fixture is installed in the spline groove with a 45° tooth profile angle of the cross bar through the spline with a 45° tooth profile angle. When the microphone is installed in the fixture, the position of the spline with a 45° tooth profile angle in the spline groove with a 45° tooth profile angle can be adjusted in a way of rotating 45° each time according to the test requirements, so as to adjust the angle of the microphone.

[0012] (2) The present utility model provides a fixing bracket for an engine noise test microphone. The first scale line, the second scale line and the third scale line are respectively marked on the base auxiliary landing rod. The three scale lines on the auxiliary landing rod respectively correspond to the positions of the microphone when the fixture is adjusted clockwise by 0°, 45° and 90°. Thus, the position of the microphone clamped by the fixture is mapped to the end of the auxiliary landing rod. Then, only the distance between the auxiliary landing rods of the two brackets needs to be measured to obtain the distance between the microphones of the two brackets, thereby avoiding the situation that the distance between the microphones cannot be directly measured due to the height limitation of the brackets, resulting in low accuracy of the engine noise test data and affecting the whole test result and work efficiency.

[0013] (3) The present utility model provides a fixing bracket for an engine noise test microphone. The vertical rod is detachably assembled by the joint rods and sleeves with standard lengths, which can meet the requirements of different erection heights and is convenient for disassembly and storage. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a schematic diagram of the overall structure of the microphone fixing bracket of the present utility model;

[0015] Figure 2 is a schematic diagram of the structure of the fixture of the microphone cross bar of the present utility model when it is opened;

[0016] Figure 3 is a schematic diagram of the structure of the fixture of the microphone cross bar of the present utility model when it is closed.

[0017] In the figure: 1, base; 2, vertical rod; 21, sectional rod; 22, sleeve; 3, auxiliary landing rod; 31, first scale line; 32, second scale line; 33, third scale line; 4, cross bar; 5, clamp; 6, first bolt; 7, nut; 8, U-shaped sleeve; 9, second bolt. Specific implementation mode

[0018] In order to enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of this application.

[0019] Please refer to Figures 1-3 , an engine noise test microphone fixing bracket, including a cross bar 4 and a clamp 5. The connecting part of the clamp 5 is provided with a spline with a 45° tooth profile angle. One end of the cross bar 4 is fixed to the end of the vertical rod 2 through a U-shaped sleeve 8 and a second bolt 9, and the other end is provided with a spline groove with a 45° tooth profile angle that is fitted with the spline with a 45° tooth profile angle. The spline with a 45° tooth profile angle is embedded in the spline groove with a 45° tooth profile angle and fastened by a first bolt 6 and a nut 7. When the microphone is installed in the clamp 5, the position of the spline with a 45° tooth profile angle in the spline groove with a 45° tooth profile angle can be adjusted in a way of rotating 45° each time according to the test requirements, so as to adjust the angle of the microphone.

[0020] Specifically, please refer to Figure 1 , the vertical rod 2 includes two sectional rods 21 connected by a sleeve 22. The inner walls at both ends of the sleeve 22 are provided with first threaded holes, and the end surfaces of the sectional rods 21 are processed with threads that are fitted with the first threaded holes. The adjacent sectional rods 21 are respectively inserted into the sleeve 22 from both ends of the sleeve 22 for screw connection. The sectional rods 21 and the sleeve 22 are both standard parts with a length of 0.5 m. When the noise test requires the microphone to be installed at a height of 1 m, it is preferably equipped with two sectional rods 21 and one sleeve 22; when the noise test requires the microphone to be installed at a height of 2 m, it is preferably equipped with three sectional rods 21 and two sleeves 22; when the noise test requires the microphone to be installed at a height of 3 m, it is preferably equipped with five sectional rods 21 and seven sleeves 22.

[0021] Specifically, please refer to Figure 1, the vertical rod 2 is installed on the disc base 1. A second threaded hole matching the thread at the end of the joint rod 21 is provided at the center of the top of the base 1. The vertical rod 2 is installed in the second threaded hole through the thread at the end of the joint rod 21. A hole is provided on the side of the base 1, and an auxiliary landing rod 3 is inserted through the hole. The outer diameter of the auxiliary landing rod 3 is larger than the inner diameter of the hole. During use, the exposed length of the auxiliary landing rod 3 can be adjusted by dragging the auxiliary landing rod 3. The first scale line 31, the second scale line 32 and the third scale line 33 are respectively marked on the auxiliary landing rod 3. The above three scale lines respectively correspond one by one to the positions of the microphone when the clamp 5 is adjusted clockwise by 0°, 45°, and 90°. That is: when the microphone is in the 0° position, adjust the first scale line 31 to be tangent to the side of the base 1; when the microphone is in the 45° position, adjust the second scale line 32 to be tangent to the side of the base 1; when the microphone is in the 90° position, adjust the third scale line 33 to be tangent to the side of the base 1. During use, by adjusting the exposed length of the auxiliary landing rod 3, the corresponding scale line on it is tangent to the side of the base 1, so that the position of the microphone clamped by the clamp 5 is mapped to the end of the auxiliary landing rod 3. Then, only the distance between the auxiliary landing rods 3 of the two brackets needs to be measured to obtain the distance between the microphones of the two brackets, thus avoiding the inability to directly measure the distance between the microphones due to the height limitation of the brackets, resulting in low accuracy of the engine noise test data and affecting the entire test result and work efficiency.

[0022] The above content is a further detailed description of the present invention in combination with specific preferred embodiments. It cannot be determined that the specific implementation of the present invention is only limited to these descriptions. For those skilled in the technical field to which the present invention belongs, without departing from the concept of the present invention, several equivalent substitutions or obvious variations can still be made, and the performance or use is the same, and all should be regarded as belonging to the protection scope of the present invention.

Claims

1. A microphone fixing bracket for engine noise testing, characterized in that: It comprises a cross bar and a clamp, wherein the connecting part of the clamp is provided with a spline with a tooth angle of 45°, one end of the cross bar is mounted on the vertical pole, and the other end is provided with a spline groove with a tooth angle of 45° matched with the spline with a tooth angle of 45°, and one end of the vertical pole is mounted on the base.

2. The engine noise test microphone fixing bracket according to claim 1, characterized in that: A hole is opened on the side of the base, an auxiliary landing rod is passed through the inside of the hole, scale lines are arranged on the auxiliary landing rod, and the outer diameter of the auxiliary landing rod is greater than the inner diameter of the hole.

3. The engine noise test microphone fixing bracket according to claim 1, characterized in that: The spline with a tooth profile angle of 45° is embedded in a spline groove with a tooth profile angle of 45° and is fastened by a first bolt and a nut.

4. The engine noise test microphone fixing bracket according to claim 1, characterized in that: The vertical pole includes more than two segmented poles connected by sleeves, the inner walls at both ends of the sleeves are provided with first threaded holes, and the surface of the end of the segmented pole is processed with threads matched with the first threaded holes.

5. The engine noise test microphone fixing bracket according to claim 4, characterized in that: A second threaded hole matched with the thread of the end of the segment rod is provided at the center of the top of the base.

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