Novel electric automobile rear axle assembly noise testing device

Abstract

The invention discloses a novel noise testing device for a rear axle assembly of an electric vehicle. The novel noise testing device comprises a base, the mechanical arm is mounted on the base; a fixing plate; the mounting plate is fixed at the moving end of the mechanical arm, and the mounting plate is fixedly connected with the fixed plate; the floating plate is arranged on the fixed plate in a sliding manner; the industrial microphone sensor is mounted on the floating plate; the sound insulation structure is arranged on the floating plate; and the floating plate is connected with the fixed plate through the sliding structure. The sound insulation cotton is accurately controlled to be attached to the position to be tested of the electric automobile rear axle assembly through the mechanical arm, a closed space is formed, the surrounding environment noise is effectively isolated, the noise detection precision is remarkably improved, the sound insulation effect is further enhanced through combined use of the sound insulation cotton and the sealing ring, and the accuracy of the test result is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of electric vehicle rear axle assembly noise testing, and in particular to a novel electric vehicle rear axle assembly noise testing device. Background Art

[0002] NVH is the abbreviation of noise, vibration and harshness, which is a comprehensive issue to measure the quality of automobile manufacturing. It gives the most direct and superficial experience to automobile users. The NVH problem of vehicles is one of the issues that all major vehicle manufacturers and parts companies in the international automobile industry are concerned about. Statistics show that about 1 / 3 of the failure problems of vehicles are related to the NVH problems of vehicles, and nearly 20% of the research and development expenses of major companies are spent on solving the NVH problems of vehicles.

[0003] In the prior art, workers usually use a handheld noise meter to detect noise on the rear axle assembly of an electric vehicle. The solution of using a handheld noise meter to detect noise on the rear axle of a new energy vehicle has significant disadvantages: it is mainly limited to measuring the sound range audible to the human ear, and its detection capability for high-frequency noise and abnormal noise is seriously insufficient. Since the noise that may be generated by the rear axle of a new energy vehicle often contains high-frequency components, these high-frequency noise and abnormal noise are crucial for evaluating the vehicle's operating status and diagnosing potential faults. However, the handheld noise meter was not originally designed for such professional applications, and its measurement range and accuracy cannot meet the needs of accurate detection of high-frequency noise, which may lead to the omission or misjudgment of key noise signals, affecting the accurate assessment and timely maintenance of the health status of the rear axle of new energy vehicles. Summary of the invention

[0004] In order to overcome the above technical problems, the purpose of the present invention is to provide a novel electric vehicle rear axle assembly noise testing device.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] A novel electric vehicle rear axle assembly noise test device, comprising:

[0007] Base;

[0008] A mechanical arm, mounted on the base;

[0009] Fixed plate;

[0010] A mounting plate, fixed to the moving end of the robotic arm, the mounting plate being fixedly connected to the fixed plate;

[0011] A floating plate, slidably disposed on the fixed plate;

[0012] an industrial microphone sensor mounted on the floating plate;

[0013] a sound insulation structure, arranged on the floating plate;

[0014] Sliding structure, the floating plate is connected to the fixed plate through the sliding structure.

[0015] As a further solution of the present invention: the sound insulation structure comprises:

[0016] Sound insulation cotton, fixed on the side of the fixing plate, the sound insulation cotton is in a ring structure;

[0017] A sealing ring is fixed on the side of the fixing plate, the sealing ring is located inside the sound insulation cotton, and the industrial microphone sensor is located inside the sealing ring.

[0018] As a further solution of the present invention: the sliding structure comprises:

[0019] Two sliding sleeves are both fixed on the fixed plate;

[0020] Two sliding rods are respectively slidably assembled on the two sliding sleeves, and one end of the two sliding rods is fixedly connected to the floating plate;

[0021] One end of the two springs is connected to the fixed plate, and the other end is connected to the floating plate.

[0022] As a further solution of the present invention: the sound insulation cotton and the fixed plate are jointly provided with a sealing structure, and the sealing structure comprises:

[0023] A sealing ring, fixed on the bottom surface of the sound insulation cotton, the sealing ring is a hollow structure;

[0024] A fixing seat, fixed on the fixing plate;

[0025] A movable plate is slidably arranged inside the fixed seat;

[0026] An air bag, one end of which is connected to the inner surface of the fixing seat, and the other end of which is connected to the movable plate;

[0027] A push rod is fixed on the movable plate, one end of the push rod away from the movable plate passes through a fixing seat and is slidably connected with the fixing seat, and the push rod is located directly above the industrial microphone sensor.

[0028] As a further solution of the present invention: the floating plate is provided with a mounting structure for fixing the industrial microphone sensor, and the mounting structure comprises:

[0029] A mounting cylinder fixed to the floating plate;

[0030] A plurality of openings are provided on the mounting tube;

[0031] A plurality of card blocks are slidably disposed in the plurality of openings, and each of the card blocks is provided with an inclined surface;

[0032] A movable sleeve is placed above the installation tube, and the bottom opening of the movable sleeve is larger than the top opening;

[0033] Two connecting pieces, the movable sleeve and the fixed seat are connected through the two connecting pieces.

[0034] As a further solution of the present invention: the connecting piece includes:

[0035] An outer cylinder, fixed on the fixing seat;

[0036] An inner rod is slidably disposed in the outer cylinder, one end of the inner rod extends to the outside of the outer cylinder and is fixedly connected to the movable sleeve;

[0037] Spring 2 is arranged between the outer tube and the inner rod.

[0038] As a further solution of the present invention: the side surface of the movable plate and the inner surface of the fixed seat are in contact with each other.

[0039] As a further solution of the present invention: a plurality of the card blocks are distributed in a circumferential array.

[0040] Beneficial effects of the present invention:

[0041] 1. The mechanical arm precisely controls the sound insulation cotton to fit the position to be tested of the rear axle assembly of the electric vehicle, forming a closed space, effectively isolating the surrounding noise and significantly improving the accuracy of noise detection. The combination of the sound insulation cotton and the sealing ring further enhances the sound insulation effect and ensures the accuracy of the test results;

[0042] 2. The design of the floating plate allows it to move relative to the fixed plate, effectively isolating the vibration generated by the robot arm itself and the ground, further improving the accuracy of noise detection. At the same time, the guiding effect of the sliding sleeve and the sliding rod and the setting of the spring ensure that the sound insulation cotton is always close to the rear axle assembly of the electric vehicle, maintaining stability during the test;

[0043] 3. The installation structure enables the staff to easily and quickly disassemble and assemble the test equipment, improving work efficiency. The coordinated design of the moving sleeve and the clamping block realizes rapid fixation and release. At the same time, the limiting function of the inner rod and the outer cylinder ensures the stability of the moving sleeve during movement, making the entire operation process more convenient and efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] The present invention will be further described below in conjunction with the accompanying drawings.

[0045] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0046] Figure 2 It is a structural schematic diagram of a fixed plate, a mounting plate and a floating plate;

[0047] Figure 3 It is a structural diagram of the installation structure;

[0048] Figure 4 yes Figure 2 A schematic cross-sectional structure diagram of ;

[0049] Figure 5 It is a structural diagram of the sound insulation structure.

[0050] In the figure: 1. base; 2. robotic arm; 3. fixed plate; 4. mounting plate; 5. floating plate; 6. industrial microphone sensor; 71. sound insulation cotton; 72. sealing ring; 81. sliding sleeve; 82. sliding rod; 83. spring 1; 91. sealing ring; 92. fixing seat; 93. moving plate; 94. airbag; 95. push rod; 101. mounting tube; 102. opening; 103. block; 104. moving sleeve; 105. connecting piece. DETAILED DESCRIPTION

[0051] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0052] like Figure 1-5 As shown, a novel electric vehicle rear axle assembly noise test device includes a base 1; a mechanical arm 2, mounted on the base 1; a fixed plate 3; a mounting plate 4, fixed to the moving end of the mechanical arm 2, and the mounting plate 4 is fixedly connected to the fixed plate 3; a floating plate 5, slidably arranged on the fixed plate 3; an industrial microphone sensor 6, mounted on the floating plate 5;

[0053] The electric vehicle rear axle assembly noise test device also includes a sound insulation structure, which is arranged on the floating plate 5. The sound insulation structure includes: a sound insulation cotton 71, which is fixed to the side of the fixed plate 3, and the sound insulation cotton 71 is an annular structure; a sealing ring 72, which is fixed to the side of the fixed plate 3, and the sealing ring 72 is located inside the sound insulation cotton 71, and the industrial microphone sensor 6 is located inside the sealing ring 72. The sound insulation cotton 71 and the sealing ring 72 are used to isolate the noise of the surrounding environment. A closed space is formed between the sound insulation cotton 71 and the electric vehicle rear axle assembly, and the industrial microphone sensor 6 is located in the closed space. The closed space basically isolates the surrounding environmental noise, greatly improving the detection accuracy;

[0054] The electric vehicle rear axle assembly noise testing device also includes a sliding structure, and the floating plate 5 is connected to the fixed plate 3 through the sliding structure. The sliding structure includes: two sliding sleeves 81, both fixed on the fixed plate 3; two sliding rods 82, respectively slidably assembled on the two sliding sleeves 81, and one end of the two sliding rods 82 is fixedly connected to the floating plate 5; two springs 83, one end of which is connected to the fixed plate 3, and the other end is connected to the floating plate 5. For the floating plate 5, the floating plate 5 can move relative to the fixed plate 3. The movable characteristic of the floating plate 5 can isolate the vibration generated by the mechanical arm 2 itself and the vibration of the ground, further improving the detection accuracy. When the floating plate 5 moves, the two sliding sleeves 81 and the two sliding rods 82 guide the movement of the floating plate 5, and the setting of the two springs 83 enables the sound insulation cotton 71 to always be close to the rear axle assembly of the electric vehicle, ensuring the sound insulation effect of the sound insulation cotton 71;

[0055] The sound insulation cotton 71 and the fixed plate 3 are jointly provided with a sealing structure, which includes: a sealing ring 91, which is fixed to the bottom surface of the sound insulation cotton 71, and the sealing ring 91 is a hollow structure; a fixed seat 92, which is fixed to the fixed plate 3; a movable plate 93, which is slidably arranged inside the fixed seat 92, and the side surface of the movable plate 93 and the inner surface of the fixed seat 92 fit each other; an airbag 94, one end of which is connected to the inner surface of the fixed seat 92, and the other end is connected to the movable plate 93; a push rod 95, which is fixed on the movable plate 93, and the end of the push rod 95 away from the movable plate 93 passes through the fixed seat 92 and is slidably connected to the fixed seat 92, and the push rod 95 is located at the industrial microphone sensor When the floating plate 5 moves toward the direction close to the fixed seat 92, the floating plate 5 will move away from the rear axle assembly of the electric vehicle. At this time, the industrial microphone sensor 6 will support the push rod 95 and push the push rod 95 to move. When the push rod 95 moves, it can drive the movable plate 93 to move, so that the movable plate 93 squeezes the airbag 94. When the airbag 94 is squeezed, the gas in the airbag 94 will be pressed into the sealing ring 91, which makes the sealing ring 91 inflated. When the sealing ring 91 expands, the sealing ring 91 can apply pressure to the rear axle assembly of the electric vehicle and the sound insulation cotton 71, so as to improve the sealing effect between the sound insulation cotton 71 and the rear axle assembly of the electric vehicle;

[0056] The floating plate 5 is provided with a mounting structure for fixing the industrial microphone sensor 6, and the mounting structure includes: a mounting tube 101, fixed on the floating plate 5; a plurality of openings 102, all of which are opened on the mounting tube 101; a plurality of blocks 103, respectively slidably arranged in the plurality of openings 102, each of which is provided with an inclined surface, and the plurality of blocks 103 are distributed in a circumferential array; a movable sleeve 104, placed above the mounting tube 101, the bottom opening 102 of the movable sleeve 104 being larger than the top opening 102; two connecting members 105, the movable sleeve 104 is connected to the fixed seat 92 through the two connecting members 105, and the connecting member 105 includes: an outer tube, fixed on the fixed seat 92; an inner rod, slidably arranged in the outer tube, one end of the inner rod extends to the outside of the outer tube and is fixedly connected to the movable sleeve 104; a spring second is provided Between the outer tube and the inner rod, for the installation structure, the staff first pulls the movable sleeve 104 to separate the movable sleeve 104 from the plurality of blocks 103, and then passes the industrial microphone sensor 6 through the installation tube 101, so that the industrial microphone sensor 6 is located between the plurality of blocks 103. Further, the staff loosens the movable sleeve 104, so that the movable sleeve 104 is reset under the action of the two connecting pieces 105. At this time, the movable sleeve 104 will approach the installation tube 101 and squeeze the inclined surfaces of the plurality of blocks 103. Since the end of the movable sleeve 104 close to the installation tube 101 is larger than the end away from the installation tube 101, when the movable sleeve 104 squeezes the inclined surfaces of the plurality of blocks 103, the plurality of blocks 103 can move synchronously and press the industrial microphone sensor 6 together, thereby fixing the industrial microphone sensor 6.

[0057] Working principle of the present invention:

[0058] When the electric vehicle rear axle assembly noise testing device proposed by the present invention is in use, the position of the industrial microphone sensor 6 is controlled by the mechanical arm 2. When the electric vehicle rear axle assembly is subjected to a noise test, the mechanical arm 2 controls the industrial microphone sensor 6 to move until the sound insulation cotton 71 fits with the position to be tested of the electric vehicle rear axle assembly. In this case, the sound insulation cotton 71 and the sealing ring 72 are used to isolate the noise of the surrounding environment. A closed space is formed between the sound insulation cotton 71 and the electric vehicle rear axle assembly. The industrial microphone sensor 6 is located in the closed space. The closed space basically isolates the surrounding environmental noise, greatly improving the detection accuracy. In addition, for the floating plate 5, the floating plate 5 can move relative to the fixed plate 3. The movable characteristic of the floating plate 5 can isolate the vibration generated by the mechanical arm 2 itself and the vibration of the ground, further improving the detection accuracy. When the floating plate 5 moves, the two sliding sleeves 81 and the two sliding rods 82 guide the movement of the floating plate 5, and the setting of the two springs 83 enables the sound insulation cotton 71 to always be close to the electric vehicle rear axle assembly, thereby ensuring the sound insulation effect of the sound insulation cotton 71.

[0059] In addition, a sealing ring 91 is also provided on the sound insulation cotton 71. When the floating plate 5 moves toward the direction close to the fixed seat 92, the floating plate 5 will move away from the rear axle assembly of the electric vehicle. At this time, the industrial microphone sensor 6 will support the push rod 95 and push the push rod 95 to move. When the push rod 95 moves, it can drive the moving plate 93 to move, so that the moving plate 93 squeezes the airbag 94. When the airbag 94 is squeezed, the gas in the airbag 94 will be pressed into the sealing ring 91, which makes the sealing ring 91 inflated. When the sealing ring 91 expands, the sealing ring 91 can apply pressure to the rear axle assembly of the electric vehicle and the sound insulation cotton 71, so as to improve the sealing effect between the sound insulation cotton 71 and the rear axle assembly of the electric vehicle;

[0060] The floating plate 5 is also provided with an installation structure for installing the industrial microphone sensor 6. For the installation structure, the staff first pulls the movable sleeve 104 to separate the movable sleeve 104 from the plurality of blocks 103, and then passes the industrial microphone sensor 6 through the installation cylinder 101 to place the industrial microphone sensor 6 between the plurality of blocks 103. Further, the staff loosens the movable sleeve 104 to reset the movable sleeve 104 under the action of the two connecting members 105. At this time, the movable sleeve 104 will approach the installation cylinder 101 and squeeze the inclined surfaces of the plurality of blocks 103. Since the end of the movable sleeve 104 close to the installation cylinder 101 is larger than the end away from the installation cylinder 10 1, so when the moving sleeve 104 squeezes the inclined surfaces of the plurality of blocks 103, the plurality of blocks 103 can move synchronously and jointly press the industrial microphone sensor 6, thereby fixing the industrial microphone sensor 6. When the industrial microphone sensor 6 needs to be disassembled, the staff only needs to pull the moving sleeve 104 to separate the moving sleeve 104 from the plurality of blocks 103. This quick disassembly and assembly mechanism is convenient for the staff to quickly disassemble and assemble the industrial microphone sensor 6. In addition, when the moving sleeve 104 is moving, the two inner rods and the two outer cylinders limit the movement of the moving sleeve 104, thereby ensuring the stability of the moving sleeve 104 during the movement.

[0061] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A new type of electric vehicle rear axle assembly noise test device, characterized in that: include: Base (1); A mechanical arm (2) mounted on the base (1); Fixed plate (3); A mounting plate (4) is fixed to the moving end of the mechanical arm (2), and the mounting plate (4) is fixedly connected to the fixing plate (3); A floating plate (5) slidably disposed on the fixed plate (3); An industrial microphone sensor (6) mounted on the floating plate (5); A sound insulation structure, arranged on the floating plate (5); A sliding structure, wherein the floating plate (5) is connected to the fixed plate (3) via the sliding structure.

2. A novel electric vehicle rear axle assembly noise testing device according to claim 1, characterized in that: The sound insulation structure comprises: Sound insulation cotton (71), fixed on the side of the fixing plate (3), the sound insulation cotton (71) is in a ring structure; The sealing ring (72) is fixed on the side of the fixing plate (3), the sealing ring (72) is located inside the sound insulation cotton (71), and the industrial microphone sensor (6) is located inside the sealing ring (72).

3. A novel electric vehicle rear axle assembly noise testing device according to claim 1, characterized in that: The sliding structure comprises: Two sliding sleeves (81) are both fixed on the fixing plate (3); Two sliding rods (82) are respectively slidably assembled on the two sliding sleeves (81), and one end of the two sliding rods (82) is fixedly connected to the floating plate (5); Two springs (83) are connected to the fixed plate (3) at one end and to the floating plate (5) at the other end.

4. A novel electric vehicle rear axle assembly noise testing device according to claim 2, characterized in that: The sound insulation cotton (71) and the fixing plate (3) are provided with a sealing structure, and the sealing structure comprises: A sealing ring (91) is fixed on the bottom surface of the sound insulation cotton (71), and the sealing ring (91) is a hollow structure; A fixing seat (92) fixed on the fixing plate (3); A movable plate (93) is slidably disposed inside the fixed seat (92); An air bag (94), one end of which is connected to the inner surface of the fixing seat (92), and the other end of which is connected to the movable plate (93); A push rod (95) is fixed on the movable plate (93), and one end of the push rod (95) away from the movable plate (93) passes through the fixed seat (92) and is slidably connected to the fixed seat (92). The push rod (95) is located directly above the industrial microphone sensor (6).

5. A novel electric vehicle rear axle assembly noise testing device according to claim 4, characterized in that: The floating plate (5) is provided with a mounting structure for fixing the industrial microphone sensor (6), and the mounting structure comprises: A mounting cylinder (101) fixed on the floating plate (5); A plurality of openings (102) are provided on the installation tube (101); A plurality of card blocks (103) are respectively slidably disposed in the plurality of openings (102), and each of the card blocks (103) is provided with an inclined surface; A movable sleeve (104) is placed above the installation tube (101), and a bottom opening (102) of the movable sleeve (104) is larger than a top opening (102); Two connecting pieces (105), the movable sleeve (104) and the fixed seat (92) are connected via the two connecting pieces (105).

6. A novel electric vehicle rear axle assembly noise testing device according to claim 5, characterized in that: The connecting member (105) comprises: An outer cylinder fixed on the fixing seat (92); An inner rod is slidably disposed in the outer cylinder, one end of the inner rod extends to the outside of the outer cylinder and is fixedly connected to the moving sleeve (104); Spring 2 is arranged between the outer tube and the inner rod.

7. A novel electric vehicle rear axle assembly noise testing device according to claim 4, characterized in that: The side surface of the movable plate (93) and the inner surface of the fixed seat (92) are in contact with each other.

8. The novel electric vehicle rear axle assembly noise testing device according to claim 5 is characterized in that: The plurality of blocks (103) are distributed in a circumferential array.

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