Fixtures, systems and methods for testing high-temperature abnormal noise in automotive connecting rods

Abstract

This application provides a testing fixture, system, and method for high-temperature abnormal noise of automotive connecting rods, belonging to the field of automotive chassis technology. The testing fixture for high-temperature abnormal noise of automotive connecting rods includes: a torque testing device, fixedly connected to a connecting bracket, used to provide the test torque required for testing the automotive connecting rod, and to collect the critical state torque and post-motion torque of the automotive connecting rod, generating a torque curve; a connecting bracket, used to fix a first ball joint assembly at one end of the automotive connecting rod to the torque testing device; and a counterweight assembly, detachably mounted on the automotive connecting rod, used to provide counterweight so that the automotive connecting rod can swing vertically under the drive of the test torque. Through the above technical means, the automotive connecting rod can be connected to the torque testing device that provides torque during the testing process, and a counterweight can be added to the automotive connecting rod to make it swing vertically under the drive of the test torque, thus simulating the movement of the automotive connecting rod during vehicle operation.

Description

Technical Field

[0001] This application relates to the field of automotive chassis technology, specifically to a high-temperature abnormal noise testing fixture for automotive connecting rods, a high-temperature abnormal noise testing system for automotive connecting rods, and a high-temperature abnormal noise testing method for automotive connecting rods. Background Technology

[0002] The front connecting rod assembly of an automobile typically uses ball joints at both ends. One end of the ball joint connects to the strut, and the other end connects to the stabilizer bar. As a two-force member, its main function is to transmit force and torque. Because the component is located in the engine compartment, the temperature of the connecting rod ball joint can reach about 80°C when the engine is running and dissipating heat. If the ambient temperature of the car is around 35°C, the ball joint cannot cool down quickly enough, causing it to "stick" under prolonged high-temperature conditions. This "sticking" generates vibration, which is transmitted through the lower body to the interior of the vehicle, making a "clattering" or drumming sound audible to the occupants, leading to customer complaints.

[0003] In traditional methods, the "clunking" or drumming noise caused by the connecting rod needs to be detected through a whole vehicle NVH evaluation. However, a whole vehicle NVH evaluation requires assembling a complete prototype vehicle. The cycle from designing the connecting rod to verifying the noise is long, and the whole vehicle NVH evaluation is greatly affected by environmental factors. The ambient temperature is also not easy to reach during the evaluation process. Summary of the Invention

[0004] One objective of this application is to provide a testing fixture for high-temperature abnormal noise in automotive connecting rods. This fixture can drive the automotive connecting rod to swing vertically to simulate the movement of the connecting rod during vehicle operation. A second objective is to provide a testing system for high-temperature abnormal noise in automotive connecting rods. This system can drive a high-temperature automotive connecting rod to simulate vibration acceleration during movement. Furthermore, by measuring the vibration acceleration and torque curve of the connecting rod, the presence of high-temperature abnormal noise in the connecting rod can be identified, solving the problems of long verification cycles and complex verification processes in traditional methods. A third objective is to provide a testing method for high-temperature abnormal noise in automotive connecting rods. This method is simple and effective for testing high-temperature abnormal noise in automotive connecting rods.

[0005] To achieve the above objectives, the technical solution adopted in this application is as follows:

[0006] A high-temperature abnormal noise testing fixture for automotive connecting rods, the automotive connecting rod high-temperature abnormal noise testing fixture comprising:

[0007] The torque testing equipment is fixedly connected to the connecting bracket and is used to provide the test torque required for testing automotive connecting rods. It also collects the critical state torque and the torque after movement of the automotive connecting rods and generates a torque curve.

[0008] A connecting bracket is used to fix the first ball joint assembly at one end of the automotive connecting rod to the torque testing equipment.

[0009] A counterweight assembly, detachably mounted on the vehicle connecting rod, is used to provide counterweight so that the vehicle connecting rod can swing vertically under the drive of the test torque.

[0010] Using the above-mentioned technical means, the car connecting rod can be connected to the torque testing equipment that provides torque during the test. At the same time, a counterweight can be added to the car connecting rod so that the car connecting rod can swing vertically under the drive of the test torque, thereby simulating the movement of the car connecting rod during vehicle movement.

[0011] In this embodiment of the application, the torque testing device includes: a torque testing device body and a rotating shaft, the torque testing device body is connected to the rotating shaft, and the rotating shaft is fixedly connected to the connecting bracket.

[0012] According to the above technical means, the main body of the torque testing equipment provides the test torque, the rotating shaft transmits the test torque to the connecting bracket, and then the test torque is transmitted to the first ball joint assembly of the car connecting rod through the connecting bracket.

[0013] In this embodiment of the application, the torque testing device further includes: a connecting plate; a third through hole is provided in the middle of the connecting plate, the third through hole being used for interference fit and fixation with the rotating shaft; a plurality of connecting through holes are provided around the third through hole on the connecting plate.

[0014] According to the above technical means, the rotating shaft of the torque testing equipment is fixed to the connecting plate by interference fit, and multiple connecting through holes are opened on the connecting plate for fixing the connecting bracket.

[0015] In this embodiment of the application, the connecting bracket includes: a closed first plate and a second plate, wherein the second plate has a second through hole for fixing a ball joint pin of the first ball joint assembly, and the center line of the second through hole coincides with the center line of the third through hole;

[0016] The first plate has multiple threaded holes corresponding to the multiple connecting through holes, and the connecting bracket is fixedly connected to the connecting plate by bolts through the connecting through holes and the connecting threaded holes.

[0017] Using the aforementioned technical means, the ball head pin of the first ball joint assembly passes through the second through hole and is then fixed with a nut. Since the center lines of the second and third through holes coincide, the rotation center of the ball head pin connected by the connecting bracket is consistent with the rotation center of the torque testing equipment's rotating shaft, ensuring that the torque applied to the ball head pin of the first ball joint assembly during the testing process is the same as the test torque provided by the torque testing equipment. The first plate is fixedly connected to the connecting plate through a connecting threaded hole.

[0018] In this embodiment of the application, the first plate is further provided with a first through hole, and the center line of the first through hole coincides with the center line of the third through hole.

[0019] According to the above technical means, the first through hole on the first plate can be used to pass through the part of the rotating shaft that extends beyond the third through hole, so as to ensure the fixing effect between the connecting bracket and the connecting plate.

[0020] In this embodiment of the application, the connecting bracket includes: a double-ended connecting rod, the first end of which has a fourth through hole for interference fit with the rotating shaft; the second end of which has a fifth through hole for fixing the ball pin of the first ball joint assembly; and the second end of which also has a plurality of fixed threaded holes extending to communicate with the fifth through hole.

[0021] According to the above technical means, one end of the double-ended connecting rod is fixed to the rotating shaft, and the other end is fixed to the ball head pin of the first ball joint assembly by a fixing bolt, so as to realize the transmission of test torque.

[0022] In this embodiment of the application, the counterweight assembly includes: a counterweight block; the counterweight block has a central hole and an assembly opening, and the assembly opening extends to communicate with the central hole so that the counterweight block is formed as an open ring.

[0023] According to the above technical means, the counterweight can be assembled onto the connecting rod of the automobile connecting rod through the assembly opening, with the center hole fitting into the connecting rod.

[0024] In this embodiment of the application, the counterweight assembly further includes: a counterweight connecting bracket; the counterweight connecting bracket is a three-tiered frustum shape; the counterweight connecting bracket has an oblong slot for assembling with the connecting rod of the automobile connecting rod, and the counterweight connecting bracket includes a first counterweight step and a second counterweight step for placing the counterweight block.

[0025] Based on the above technical means, the counterweight connection bracket provides two counterweight steps, which facilitates the addition of counterweight weight as needed.

[0026] A second aspect of this application provides a high-temperature abnormal noise testing system for automotive connecting rods, the system comprising:

[0027] The aforementioned automotive connecting rod high-temperature abnormal noise testing fixture is used to drive the automotive connecting rod to swing vertically under the action of the test torque, while simultaneously collecting the critical state torque and the torque after movement of the automotive connecting rod, and generating a torque curve;

[0028] A vibration acceleration sensor is fixed to the first ball joint assembly, which is fixed on the high temperature abnormal noise test fixture of the automobile connecting rod. It is used to collect the acceleration of the first ball joint assembly during the test and transmit it to the host computer.

[0029] The host computer is connected to the vibration acceleration sensor and the torque testing equipment in the high-temperature abnormal noise test fixture of the automobile connecting rod, and is used to evaluate whether there is high-temperature abnormal noise in the automobile connecting rod based on the torque curve of the automobile connecting rod and the acceleration curve formed by the acceleration.

[0030] An operating table is used to place the torque testing equipment and to provide the space required for the swing of the vehicle connecting rod.

[0031] Based on the above technical means, it is possible to drive a car connecting rod in a high-temperature state to simulate the vibration acceleration during the movement process. Furthermore, by using the vibration acceleration and torque curve of the car connecting rod obtained through testing, it is possible to identify whether there is high-temperature abnormal noise in the car connecting rod, thus solving the problems of long verification cycle and complex verification process of high-temperature abnormal noise in car connecting rods in traditional methods.

[0032] A third aspect of this application provides a method for testing high-temperature abnormal noise in automotive connecting rods, the method being based on the aforementioned automotive connecting rod high-temperature abnormal noise testing system, the method comprising:

[0033] The vibration acceleration sensor is fixed to the first ball joint assembly of the connecting rod of the vehicle under test;

[0034] The automotive connecting rod to be tested is mounted on the automotive connecting rod high-temperature abnormal noise test fixture;

[0035] When the connecting rod of the vehicle under test meets the required temperature, the torque testing equipment is started to perform the test.

[0036] The acceleration of the first ball joint assembly during the test was collected by a vibration acceleration sensor;

[0037] The critical torque and post-motion torque of the automotive connecting rod are collected by torque testing equipment, and a torque curve is generated.

[0038] The host computer assesses whether there is high-temperature abnormal noise in the car connecting rod based on the torque curve and the acceleration curve formed by the acceleration.

[0039] The above method uses a vibration acceleration sensor to collect the acceleration of the first ball joint assembly under high temperature conditions during the test. The torque testing equipment collects the critical torque and the torque after movement of the automotive connecting rod and generates a torque curve. Based on the torque curve of the automotive connecting rod and the acceleration curve formed by the acceleration, the presence of high-temperature abnormal noise in the automotive connecting rod can be evaluated, shortening the verification cycle of high-temperature abnormal noise. The verification method is simple and easy to implement, and can quickly identify whether there is a risk of high-temperature abnormal noise in the automotive connecting rod. This allows for the avoidance of abnormal noise from the part design stage, reducing the resources and costs of vehicle abnormal noise verification, and shortening the vehicle verification cycle and the part development and rectification cycle.

[0040] In this embodiment of the application, the method further includes:

[0041] After fixing the vibration acceleration sensor to the first ball joint assembly of the connecting rod of the vehicle under test, the fixed vibration acceleration sensor and the connecting rod of the vehicle under test are heated at high temperature.

[0042] The process of assembling the automotive connecting rod under test onto the high-temperature abnormal noise testing fixture includes:

[0043] The first ball joint assembly of the automotive connecting rod to be tested, heated to the required temperature, is fixed onto the connecting bracket;

[0044] The counterweight assembly is mounted on the connecting rod of the car under test.

[0045] Using the above-mentioned technical means, the fixed vibration acceleration sensor and the connecting rod of the car under test can be heated separately. The heating cost is low and easy to implement. The test process is carried out in a normal temperature environment, which is friendly to the test personnel.

[0046] In this embodiment of the application, the method further includes: after assembling the vehicle connecting rod to be tested onto the high-temperature abnormal noise testing fixture for the vehicle connecting rod, heating the entire fixture to the required temperature.

[0047] By directly heating the assembled tooling using the aforementioned technical methods, it is possible to ensure that the temperature of the car connecting rod meets the testing requirements during the testing process.

[0048] The beneficial effects of this application are:

[0049] (1) The high temperature noise test fixture for automobile connecting rod provided in this application can drive the automobile connecting rod to swing in the vertical direction to simulate the movement of the automobile connecting rod during vehicle driving.

[0050] (2) The automotive connecting rod high temperature abnormal noise test system provided in this application can drive the automotive connecting rod in a high temperature state to simulate the vibration acceleration during the movement process, and the vibration acceleration and torque curve of the automotive connecting rod obtained by the test can identify whether there is high temperature abnormal noise in the automotive connecting rod, thus solving the problem of long verification cycle and complex verification process of automotive connecting rod high temperature abnormal noise in traditional methods.

[0051] (3) The high temperature noise test method for automotive connecting rods provided in this application can assess whether there is high temperature noise in automotive connecting rods based on the torque curve of automotive connecting rods and the acceleration curve formed by the acceleration, shorten the high temperature noise verification cycle, and the verification method is simple and easy to implement. It can quickly identify whether there is a risk of high temperature noise in automotive connecting rods, thereby avoiding noise from the part design stage, reducing the resources and costs of vehicle noise verification, and shortening the vehicle verification cycle and part development and rectification cycle. Attached Figure Description

[0052] Figure 1 This is a schematic diagram of the automotive connecting rod structure of this application;

[0053] Figure 2 This is a schematic cross-sectional view of the ball joint portion of the automotive connecting rod in this application;

[0054] Figure 3 An exploded schematic diagram of the high-temperature abnormal noise testing fixture for automotive connecting rods provided in the first embodiment of this application;

[0055] Figure 4 A schematic diagram of the torque testing device in the high-temperature abnormal noise testing fixture for automotive connecting rods provided in the first embodiment of this application;

[0056] Figure 5 A schematic diagram of the connecting bracket structure in the high-temperature abnormal noise testing fixture for automotive connecting rods provided in the first embodiment of this application;

[0057] Figure 6 A schematic diagram of the counterweight connection bracket structure in the high-temperature abnormal noise testing fixture for automotive connecting rods provided in the first embodiment of this application;

[0058] Figure 7 A schematic diagram of the counterweight structure in the high-temperature abnormal noise testing fixture for automotive connecting rods provided in the first embodiment of this application;

[0059] Figure 8 An exploded schematic diagram of the high-temperature abnormal noise testing system for automotive connecting rods provided in the first embodiment of this application;

[0060] Figure 9 A schematic diagram of the assembly of the high-temperature abnormal noise testing system for automotive connecting rods provided in the first embodiment of this application;

[0061] Figure 10 A top view of the automotive connecting rod high-temperature abnormal noise testing system provided in the first embodiment of this application;

[0062] Figure 11 A schematic diagram of the connecting bracket structure in the high-temperature abnormal noise testing fixture for automotive connecting rods provided in the second embodiment of this application;

[0063] Figure 12 A schematic diagram of the connecting bracket structure in the high-temperature abnormal noise testing fixture for automotive connecting rods provided in the third embodiment of this application;

[0064] Figure 13 Flowchart of a method for testing high-temperature abnormal noise of automotive connecting rods according to one embodiment of this application;

[0065] Figure 14 A schematic diagram of the movement of the test parts in the high-temperature abnormal noise test method for automobile connecting rods provided in the first embodiment of this application;

[0066] Figure 15 A flowchart of a method for testing high-temperature abnormal noise of an automotive connecting rod, provided as another embodiment of this application.

[0067] In the diagram, 1-Automotive connecting rod, 1-1-First ball joint assembly, 1-1-1-Ball head pin, 1-1-2-Dust cover, 1-1-3-Grease, 1-1-4-Ball head seat, 1-1-5-Ball cup gasket, 1-2-Connecting rod, 1-3-Second ball joint assembly, 2-Connecting bracket, 2-1-Second through hole, 2-2-Connecting threaded hole, 2-3-First through hole, 2-4-Fourth through hole, 2-5-Fifth through hole, 2-6-Fixing threaded hole, 3-Nut, 4-Bolt, 5-Torque testing equipment, 5-1-Connecting plate, 5-1 -1-Connecting through hole, 5-1-2-Third through hole, 5-2-Rotating shaft, 5-3-Main body of torque testing equipment, 6-Operating table, 7-Counterweight connecting bracket, 7-1-First counterweight step, 7-2-Second counterweight step, 7-3-Waist-shaped slot, 7-4-Straight section of first counterweight step, 7-5-Straight section of second counterweight step, 7-6-Upper straight section, 7-7-Second circular mating surface, 7-8-First circular mating surface, 8-Counterweight block, 8-1-Center hole, 8-2-Assembly opening, 9-Vibration acceleration sensor. Detailed Implementation

[0068] The embodiments of this application will be described below with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. This application can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this application. It should be understood that the preferred embodiments are only for illustrating this application and are not intended to limit the scope of protection of this application.

[0069] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of this application. Therefore, the illustrations only show the components related to this application and are not drawn according to the number, shape and size of the components in actual implementation. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0070] In the embodiments of this application, unless otherwise stated, directional terms such as "up," "down," "left," and "right" generally refer to the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product is usually placed when in use.

[0071] The terms “first,” “second,” “third,” etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0072] The terms "horizontal," "vertical," and "sag" do not imply that a component must be absolutely horizontal, vertical, or sagging, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," not that the structure must be completely horizontal, but can be slightly tilted.

[0073] Furthermore, terms like "roughly" and "basically" are used to indicate that the content does not require absolute precision, but rather allows for a certain degree of deviation. For example, "roughly equal" does not simply mean absolute equality; in actual production and operation, achieving absolute "equality" is difficult, and a certain degree of deviation is generally present. Therefore, besides absolute equality, "roughly equal to" also includes the aforementioned situation where a certain degree of deviation exists. Using this as an example, in other cases, unless otherwise specified, terms like "roughly" and "basically" have similar meanings.

[0074] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0075] In the embodiments of this application, the following are adopted: Figure 1 The illustrated automotive connecting rod is used to illustrate this application; however, the automotive connecting rod high-temperature abnormal noise testing fixture, system, and method provided in this application can test automotive connecting rods that are not limited to those described above. Figure 1 As shown. The automotive connecting rod structure is as follows. Figure 1 As shown, the automotive connecting rod 1 includes a first ball joint assembly 1-1, a connecting rod 1-2, and a second ball joint assembly 1-3. The first ball joint assembly 1-1 is hinged to the first end of the connecting rod 1-2, and the second ball joint assembly 1-3 is hinged to the second end of the connecting rod 1-2. The first ball joint assembly 1-1 and the second ball joint assembly 1-3 have identical parts. This application uses the first ball joint assembly 1-1 as an example for detailed description, such as... Figure 2 As shown, the first ball joint assembly 1-1 includes a ball joint pin 1-1-1, a dust cover 1-1-2, a ball joint seat 1-1-4, and a ball joint gasket 1-1-5. The ball joint seat 1-1-4 has a receiving cavity for accommodating the ball joint gasket 1-1-5 and the ball joint pin 1-1-1. The ball joint gasket 1-1-5 is located between the ball joint pin 1-1-1 and the ball joint seat 1-1-4. The ball joint pin 1-1-1 passes through the dust cover 1-1-2, and the dust cover 1-1-2 is fixed to the shaft of the ball joint pin 1-1-1. The dust cover 1-1-2 is filled with lubricating grease 1-1-3.

[0076] Example 1

[0077] This embodiment provides a high-temperature abnormal noise testing fixture for automotive connecting rods, such as... Figure 3 As shown, the high-temperature abnormal noise testing fixture for automotive connecting rods includes:

[0078] The torque testing device 5 is fixedly connected to the connecting bracket 2. It is used to provide the test torque required for testing the automobile connecting rod 1, and to collect the critical state torque and the torque after movement of the automobile connecting rod 1, and generate a torque curve, which includes the critical state torque and the torque after movement.

[0079] Connecting bracket 2 is used to fix the first ball joint assembly 1-1 at one end of the car connecting rod 1 to the torque testing equipment 5;

[0080] A counterweight assembly, detachably mounted on the vehicle connecting rod 1, is used to provide counterweight so that the vehicle connecting rod 1 can swing vertically under the drive of the test torque.

[0081] Using the above-mentioned technical means, the car connecting rod 1 can be connected to the torque testing device 5 that provides torque during the test. At the same time, a counterweight can be added to the car connecting rod 1 so that the car connecting rod 1 can swing vertically under the drive of the test torque to simulate the movement of the car connecting rod 1 during vehicle operation.

[0082] In the embodiments of this application, such as Figure 4 As shown, the torque testing device 5 includes: a torque testing device body 5-3 and a rotating shaft 5-2. The torque testing device body 5-3 is connected to the rotating shaft 5-2, and the rotating shaft 5-2 is fixedly connected to the connecting bracket 2.

[0083] According to the above technical means, the main body 5-3 of the torque testing equipment provides the test torque, the rotating shaft 5-2 transmits the test torque to the connecting bracket 2, and then transmits the test torque to the first ball joint assembly 1-1 of the car connecting rod 1 through the connecting bracket 2.

[0084] In the embodiments of this application, such as Figure 4 As shown, the torque testing device 5 further includes: a connecting plate 5-1; a third through hole 5-1-2 is provided in the middle of the connecting plate 5-1, the third through hole 5-1-2 is used to fix it with the rotating shaft 5-2 by interference fit; a plurality of connecting through holes 5-1-1 are provided on the connecting plate 5-1 around the third through hole 5-1-2.

[0085] According to the above technical means, the rotating shaft 5-2 of the torque testing device 5 is fixed to the connecting plate 5-1 by interference fit, and the multiple connecting through holes 5-1-1 opened on the connecting plate 5-1 are used to fix the connecting bracket 2.

[0086] In the embodiments of this application, such as Figure 5 As shown, the connecting bracket 2 includes: a closed first plate and a second plate, and after the first plate and the second plate are closed, a space is formed in the middle for installing the ball head pin 1-1-1. The second plate is provided with a second through hole 2-1 for fixing the ball head pin 1-1-1 of the first ball joint assembly 1-1. The center line of the second through hole 2-1 coincides with the center line of the third through hole 5-1-2.

[0087] The first plate has multiple threaded holes 2-2 corresponding to the multiple connecting through holes 5-1-1. The connecting bracket 2 is fixedly connected to the connecting plate 5-1 by bolts 4 through the connecting through holes 5-1-1 and the connecting threaded holes 2-2. In this embodiment, the first plate and the second plate form a rectangular frame when closed.

[0088] Through the aforementioned technical means, the ball head pin 1-1-1 of the first ball joint assembly 1-1 passes through the second through hole 2-1 and is then fixed with a nut 3. Since the center lines of the second through hole 2-1 and the third through hole 5-1-2 coincide, the rotation center of the ball head pin 1-1-1 connected by the connecting bracket 2 is consistent with the rotation center of the rotation axis 5-2 of the torque testing device 5, ensuring that the torque applied to the ball head pin 1-1-1 of the first ball joint assembly 1-1 during the test is the same as the test torque provided by the torque testing device 5. The first plate is fixedly connected to the connecting plate 5-1 through the connecting threaded hole 2-2. In this embodiment, there are four connecting through holes 5-1-1 and four connecting threaded holes 2-2.

[0089] In this embodiment of the application, the counterweight assembly includes: a counterweight block 8 and a counterweight connecting bracket 7; as shown Figure 7 As shown, the counterweight 8 has a central hole 8-1 and an assembly opening 8-2, the assembly opening 8-2 extending to communicate with the central hole 8-1 so that the counterweight 8 forms an open ring; as Figure 6 As shown, the counterweight connecting bracket 7 is a three-tiered frustum shape; the counterweight connecting bracket 7 has an oblong slot 7-3 for assembling with the connecting rod 1-2 of the automobile connecting rod 1; the counterweight connecting bracket 7 includes a first counterweight step 7-1 and a second counterweight step 7-2 for placing the counterweight block 8, as shown. Figure 6As shown, in this embodiment, the first counterweight step 7-1 and the second counterweight step 7-2 of the counterweight connecting bracket 7 form a first circular mating surface 7-8, and the second counterweight step 7-2 and the top surface of the counterweight connecting bracket 7 form a second circular mating surface 7-7. The cut between the waist-shaped slot 7-3 and the first counterweight step 7-1 is the straight segment 7-4 of the first counterweight step, the cut between the waist-shaped slot 7-3 and the second counterweight step 7-2 is the straight segment 7-5 of the second counterweight step, and the cut between the waist-shaped slot 7-3 and the top surface of the counterweight connecting bracket 7 is the upper straight segment 7-6. The design of the waist-shaped slot and the straight segment allows the counterweight connecting bracket 2 to be stably assembled on the connecting rod 1-2.

[0090] According to the above technical means, the counterweight 8 can be assembled on the connecting rod 1-2 of the automobile connecting rod 1 through the assembly opening 8-2, the center hole 8-1 fits with the connecting rod 1-2, and the counterweight connecting bracket 7 provides two counterweight steps to facilitate the increase of counterweight weight as needed.

[0091] During assembly of the automotive connecting rod high-temperature abnormal noise testing fixture provided in the above embodiment, the rotating shaft 5-2 is first fixed to the third through hole 5-1-2 on the connecting plate 5-1 by interference fit. Then, the connecting bracket 2 is connected and fixed to the connecting plate 5-1 using bolts 4. The connection method is that the bolts 4 pass through the connecting through hole 5-1-1 and the connecting threaded hole 2-2 and are tightened with torque. The ball head pin 1-1-1 of the first ball joint assembly 1-1 of the automotive connecting rod 1 is inserted into the second through hole 2-1 of the connecting bracket 2 and fixed by the connecting nut 3. Then, the counterweight connecting bracket 7 is assembled on the connecting rod 1-2. The assembly method is that the waist-shaped slot 7-3 is clearance-fitted with the connecting rod 1-2. Finally, the counterweight block 8 is assembled on the counterweight connecting bracket 7. The assembly method is that the center hole 8-1 is clearance-fitted with the first circular mating surface 7-8 of the counterweight connecting bracket 7, and the plane of the counterweight block 8 is in contact with the first counterweight step 7-1. Due to the straight-line design of the first counterweight step 7-4 of the counterweight connecting bracket 7 and the assembly opening 8-2 of the counterweight block 8, the counterweight block 8 can be stably placed on the counterweight connecting bracket 7. The design of the second counterweight step 7-2 can accommodate more mass blocks to meet the testing counterweight requirements.

[0092] This application also provides a high-temperature abnormal noise testing system for automotive connecting rods, such as... Figure 8 The system includes:

[0093] The high-temperature abnormal noise test fixture for automotive connecting rods provided in Example 1 is used to drive automotive connecting rod 1 to swing vertically under the action of test torque, and at the same time collect the critical state torque and the torque after movement of automotive connecting rod 1, and generate torque curve;

[0094] Vibration acceleration sensor 9 is fixed to the first ball joint assembly 1-1, which is fixed on the high temperature abnormal noise test fixture of the automobile connecting rod. It is used to collect the acceleration of the first ball joint assembly 1-1 during the test and transmit it to the host computer.

[0095] The host computer is connected to the vibration acceleration sensor 9 and the torque testing device 5 in the high temperature abnormal noise test fixture of the automobile connecting rod, and is used to evaluate whether there is high temperature abnormal noise in the automobile connecting rod 1 based on the torque curve of the automobile connecting rod 1 and the acceleration curve formed by the acceleration.

[0096] The operating platform 6 is used to place the torque testing device 5 to provide the space required for the swing of the vehicle connecting rod 1. In this application, the operating platform 6 needs to be at a certain height to ensure that the vehicle connecting rod 1 is in a vertically suspended state after assembly.

[0097] Based on the above technical means, it is possible to drive the car connecting rod 1 in a high-temperature state to simulate the vibration acceleration during the movement process. Furthermore, by using the vibration acceleration obtained from the test and the torque curve of the car connecting rod 1, it is possible to identify whether the car connecting rod 1 has high-temperature abnormal noise. This solves the problem of long verification cycle and complex verification process of high-temperature abnormal noise of car connecting rod 1 in traditional methods.

[0098] When assembling the aforementioned high-temperature noise testing system for automotive connecting rods, firstly, place the torque testing device 5 on the operating table 6. The rotation axis 5-2 of the torque testing device 5 needs to extend beyond the boundary of the operating table 6 so that the automotive connecting rod 1 can swing vertically after assembly. Then, assemble the connecting bracket 2 with the torque testing device 5. After assembly, fix the vibration acceleration sensor 9 to the first ball joint assembly 1-1 of the automotive connecting rod 1. Next, insert the ball head pin 1-1-1 of the first ball joint assembly 1-1 into the second through hole 2-1 of the connecting bracket 2, and fix the ball head pin 1-1-1 with the nut 3. Finally, assemble the counterweight assembly. The assembled high-temperature noise testing system for automotive connecting rods is as follows: Figure 9 and Figure 10 As shown.

[0099] In this embodiment, a process powder is used to fix the vibration acceleration sensor 9 to the first ball joint assembly 1-1. The process powder is heat resistant and easy to remove, which can meet the high temperature requirements of the abnormal noise test of the car connecting rod 1. At the same time, it is easy to remove and disassemble the car connecting rod 1 after the test.

[0100] Example 2

[0101] This embodiment provides a high-temperature abnormal noise testing fixture for automotive connecting rods, the automotive connecting rod high-temperature abnormal noise testing fixture comprising:

[0102] The torque testing device 5 is fixedly connected to the connecting bracket 2. It is used to provide the test torque required for testing the automobile connecting rod 1, and to collect the critical state torque and the torque after movement of the automobile connecting rod 1, and generate a torque curve.

[0103] Connecting bracket 2 is used to fix the first ball joint assembly 1-1 at one end of the car connecting rod 1 to the torque testing equipment 5;

[0104] A counterweight assembly, detachably mounted on the vehicle connecting rod 1, is used to provide counterweight so that the vehicle connecting rod 1 can swing vertically under the drive of the test torque.

[0105] Using the above-mentioned technical means, the car connecting rod 1 can be connected to the torque testing device 5 that provides torque during the test. At the same time, a counterweight can be added to the car connecting rod 1 so that the car connecting rod 1 can swing vertically under the drive of the test torque to simulate the movement of the car connecting rod 1 during vehicle operation.

[0106] In this embodiment of the application, the torque testing device 5 includes: a torque testing device body 5-3 and a rotating shaft 5-2. The torque testing device body 5-3 is connected to the rotating shaft 5-2, and the rotating shaft 5-2 is fixedly connected to the connecting bracket 2.

[0107] According to the above technical means, the main body 5-3 of the torque testing equipment provides the test torque, the rotating shaft 5-2 transmits the test torque to the connecting bracket 2, and then transmits the test torque to the first ball joint assembly 1-1 of the car connecting rod 1 through the connecting bracket 2.

[0108] In this embodiment of the application, the torque testing device 5 further includes: a connecting plate 5-1; a third through hole 5-1-2 is provided in the middle of the connecting plate 5-1, the third through hole 5-1-2 is used to fix it with the rotating shaft 5-2 by interference fit; a plurality of connecting through holes 5-1-1 are provided on the connecting plate 5-1 around the third through hole 5-1-2.

[0109] According to the above technical means, the rotating shaft 5-2 of the torque testing device 5 is fixed to the connecting plate 5-1 by interference fit, and the multiple connecting through holes 5-1-1 opened on the connecting plate 5-1 are used to fix the connecting bracket 2.

[0110] In the embodiments of this application, such as Figure 11 As shown, the connecting bracket 2 includes: a closed first plate and a second plate, and after the first plate and the second plate are closed, a space is formed in the middle for installing the ball head pin 1-1-1. The second plate is provided with a second through hole 2-1 for fixing the ball head pin 1-1-1 of the first ball joint assembly 1-1.

[0111] The first plate has a first through hole 2-3 and multiple threaded holes 2-2 corresponding to the multiple connecting through holes 5-1-1. The connecting bracket 2 is fixedly connected to the connecting plate 5-1 via bolts 4 through the connecting through holes 5-1-1 and the threaded holes 2-2. The center line of the second through hole 2-1 coincides with the center line of the third through hole 5-1-2 and the center line of the first through hole 2-3. In this embodiment, the first plate and the second plate form a rectangular frame when closed.

[0112] Through the aforementioned technical means, the ball head pin 1-1-1 of the first ball joint assembly 1-1 passes through the second through hole 2-1 and is then fixed with a nut 3. Since the center lines of the second through hole 2-1 and the third through hole 5-1-2 coincide, the rotation center of the ball head pin 1-1-1 connected by the connecting bracket 2 is consistent with the rotation center of the rotation axis 5-2 of the torque testing device 5, ensuring that the torque applied to the ball head pin 1-1-1 of the first ball joint assembly 1-1 during the test is the same as the test torque provided by the torque testing device 5. The first plate is fixedly connected to the connecting plate 5-1 through the connecting threaded hole 2-2. The first through hole 2-3 on the first plate can be used to pass through the portion of the rotation axis 5-2 that extends beyond the third through hole 5-1-2, ensuring the fixing effect between the connecting bracket 2 and the connecting plate 5-1.

[0113] In this embodiment, the counterweight assembly includes: a counterweight block 8 and a counterweight connecting bracket 7; the counterweight block 8 has a central hole 8-1 and an assembly opening 8-2, the assembly opening 8-2 extending to communicate with the central hole 8-1 so that the counterweight block 8 forms an open ring; the counterweight connecting bracket 7 is a three-tiered stepped frustum shape; the counterweight connecting bracket 7 has an oblong slot 7-3 for assembling with the connecting rod 1-2 of the automobile connecting rod 1, and the counterweight connecting bracket 7 includes a first counterweight step 7-1 and a second counterweight step 7-2 for placing the counterweight block 8. In this embodiment, the counterweight connecting bracket... The first counterweight step 7-1 and the second counterweight step 7-2 of the frame 7 form a first circular mating surface 7-8. The second counterweight step 7-2 and the top surface of the counterweight connecting bracket 7 form a second circular mating surface 7-7. The cut between the waist-shaped slot 7-3 and the first counterweight step 7-1 is the straight segment 7-4 of the first counterweight step. The cut between the waist-shaped slot 7-3 and the second counterweight step 7-2 is the straight segment 7-5 of the second counterweight step. The cut between the waist-shaped slot 7-3 and the top surface of the counterweight connecting bracket 7 is the upper straight segment 7-6. The design of the waist-shaped slot and the straight segment allows the counterweight connecting bracket 2 to be stably mounted on the connecting rod 1-2.

[0114] According to the above technical means, the counterweight 8 can be assembled on the connecting rod 1-2 of the automobile connecting rod 1 through the assembly opening 8-2, the center hole 8-1 fits with the connecting rod 1-2, and the counterweight connecting bracket 7 provides two counterweight steps to facilitate the increase of counterweight weight as needed.

[0115] During assembly of the automotive connecting rod high-temperature abnormal noise testing fixture provided in Embodiment 2 above, the rotating shaft 5-2 is first fixed to the third through hole 5-1-2 on the connecting plate 5-1 with an interference fit. Then, the connecting bracket 2 is connected and fixed to the connecting plate 5-1 using bolts 4. The connection method is that the bolts 4 pass through the connecting through hole 5-1-1 and the connecting threaded hole 2-2 and are tightened with torque. The part of the rotating shaft 5-2 that extends beyond the connecting plate 5-1 is clearance-fitted with the first through hole 2-3 on the connecting bracket 2. The ball head pin 1-1-1 of the first ball joint assembly 1-1 of the automotive connecting rod 1 is inserted into the second through hole 2-1 of the connecting bracket 2 and fixed with the ball head pin 1-1-1 using the connecting nut 3. Then, the counterweight connecting bracket 7 is assembled on the connecting rod 1-2. The assembly method is that the waist-shaped slot 7-3 is clearance-fitted with the connecting rod 1-2. Finally, the counterweight 8 is assembled onto the counterweight connecting bracket 7. The assembly method involves a clearance fit between the center hole 8-1 and the first circular mating surface 7-8 of the counterweight connecting bracket 7, with the plane of the counterweight 8 fitting against the first counterweight step 7-1. Due to the straight design of the straight section 7-4 of the first counterweight step of the counterweight connecting bracket 7 and the straight design of the assembly opening 8-2 of the counterweight 8, the counterweight 8 can be stably placed on the counterweight connecting bracket 7. The design of the second counterweight step 7-2 allows for the placement of more mass blocks to meet the testing counterweight requirements.

[0116] This application also provides a high-temperature abnormal noise testing system for automotive connecting rods, the system comprising:

[0117] The high-temperature abnormal noise test fixture for automotive connecting rods provided in Example 2 is used to drive automotive connecting rod 1 to swing vertically under the action of test torque, and simultaneously collect the critical state torque and the torque after movement of automotive connecting rod 1, and generate torque curve;

[0118] Vibration acceleration sensor 9 is fixed to the first ball joint assembly 1-1, which is fixed on the high temperature abnormal noise test fixture of the automobile connecting rod. It is used to collect the acceleration of the first ball joint assembly 1-1 during the test and transmit it to the host computer.

[0119] The host computer is connected to the vibration acceleration sensor 9 and the torque testing device 5 in the high temperature abnormal noise test fixture of the automobile connecting rod, and is used to evaluate whether there is high temperature abnormal noise in the automobile connecting rod 1 based on the torque curve of the automobile connecting rod 1 and the acceleration curve formed by the acceleration.

[0120] The operating platform 6 is used to place the torque testing device 5 to provide the space required for the swing of the vehicle connecting rod 1. In this application, the operating platform 6 needs to be at a certain height to ensure that the vehicle connecting rod 1 is in a vertically suspended state after assembly.

[0121] Based on the above technical means, it is possible to drive the car connecting rod 1 in a high-temperature state to simulate the vibration acceleration during the movement process. Furthermore, by using the vibration acceleration obtained from the test and the torque curve of the car connecting rod 1, it is possible to identify whether the car connecting rod 1 has high-temperature abnormal noise. This solves the problem of long verification cycle and complex verification process of high-temperature abnormal noise of car connecting rod 1 in traditional methods.

[0122] When assembling the aforementioned high-temperature abnormal noise testing system for automotive connecting rods, firstly, the torque testing device 5 is placed on the operating table 6. The rotating shaft 5-2 of the torque testing device 5 needs to extend beyond the boundary of the operating table 6 so that the automotive connecting rod 1 can swing vertically after assembly. The connecting bracket 2 is then assembled with the torque testing device 5, with the portion of the rotating shaft 5-2 extending beyond the connecting plate 5-1 and clearance-fitted with the first through hole 2-3 on the connecting bracket 2. After assembly, the vibration acceleration sensor 9 is fixed to the first ball joint assembly 1-1 of the automotive connecting rod 1. Then, the ball head pin 1-1-1 of the first ball joint assembly 1-1 is inserted into the second through hole 2-1 of the connecting bracket 2, and the ball head pin 1-1-1 is fixed with the nut 3. Finally, the counterweight assembly is assembled.

[0123] Example 3

[0124] This embodiment provides a high-temperature abnormal noise testing fixture for automotive connecting rods, the automotive connecting rod high-temperature abnormal noise testing fixture comprising:

[0125] The torque testing device 5 is fixedly connected to the connecting bracket 2. It is used to provide the test torque required for testing the automobile connecting rod 1, and to collect the critical state torque and the torque after movement of the automobile connecting rod 1, and generate a torque curve.

[0126] Connecting bracket 2 is used to fix the first ball joint assembly 1-1 at one end of the car connecting rod 1 to the torque testing equipment 5;

[0127] A counterweight assembly, detachably mounted on the vehicle connecting rod 1, is used to provide counterweight so that the vehicle connecting rod 1 can swing vertically under the drive of the test torque.

[0128] Using the above-mentioned technical means, the car connecting rod 1 can be connected to the torque testing device 5 that provides torque during the test. At the same time, a counterweight can be added to the car connecting rod 1 so that the car connecting rod 1 can swing vertically under the drive of the test torque to simulate the movement of the car connecting rod 1 during vehicle operation.

[0129] In this embodiment of the application, the torque testing device 5 includes: a torque testing device body 5-3 and a rotating shaft 5-2. The torque testing device body 5-3 is connected to the rotating shaft 5-2, and the rotating shaft 5-2 is fixedly connected to the connecting bracket 2.

[0130] According to the above technical means, the main body 5-3 of the torque testing equipment provides the test torque, the rotating shaft 5-2 transmits the test torque to the connecting bracket 2, and then transmits the test torque to the first ball joint assembly 1-1 of the car connecting rod 1 through the connecting bracket 2.

[0131] In the embodiments of this application, such as Figure 12 As shown, the connecting bracket 2 includes: a double-ended connecting rod, the first end of which has a fourth through hole 2-4 for interference fit with the rotating shaft 5-2; the second end of which has a fifth through hole 2-5 for fixing the ball head pin 1-1-1 of the first ball joint assembly 1-1, and the second end of which also has a plurality of fixing threaded holes 2-6 extending to communicate with the fifth through hole 2-5. In this embodiment, there are four fixing threaded holes 2-6.

[0132] According to the above technical means, one end of the double-ended connecting rod is fixed to the rotating shaft 5-2, and the other end is fixed to the ball head pin 1-1-1 of the first ball joint assembly 1-1 by the fixing bolt 4, so as to realize the transmission of test torque.

[0133] In this embodiment, the counterweight assembly includes: a counterweight block 8 and a counterweight connecting bracket 7; the counterweight block 8 has a central hole 8-1 and an assembly opening 8-2, the assembly opening 8-2 extending to communicate with the central hole 8-1 so that the counterweight block 8 forms an open ring; the counterweight connecting bracket 7 is a three-tiered stepped frustum shape; the counterweight connecting bracket 7 has an oblong slot 7-3 for assembling with the connecting rod 1-2 of the automobile connecting rod 1, and the counterweight connecting bracket 7 includes a first counterweight step 7-1 and a second counterweight step 7-2 for placing the counterweight block 8. In this embodiment, the counterweight connecting bracket... The first counterweight step 7-1 and the second counterweight step 7-2 of the frame 7 form a first circular mating surface 7-8. The second counterweight step 7-2 and the top surface of the counterweight connecting bracket 7 form a second circular mating surface 7-7. The cut between the waist-shaped slot 7-3 and the first counterweight step 7-1 is the straight segment 7-4 of the first counterweight step. The cut between the waist-shaped slot 7-3 and the second counterweight step 7-2 is the straight segment 7-5 of the second counterweight step. The cut between the waist-shaped slot 7-3 and the top surface of the counterweight connecting bracket 7 is the upper straight segment 7-6. The design of the waist-shaped slot and the straight segment allows the counterweight connecting bracket 2 to be stably mounted on the connecting rod 1-2.

[0134] According to the above technical means, the counterweight 8 can be assembled on the connecting rod 1-2 of the automobile connecting rod 1 through the assembly opening 8-2, the center hole 8-1 fits with the connecting rod 1-2, and the counterweight connecting bracket 7 provides two counterweight steps to facilitate the increase of counterweight weight as needed.

[0135] During assembly of the automotive connecting rod high-temperature abnormal noise testing fixture provided in Embodiment 3 above, the rotating shaft 5-2 is first fixed to the fourth through hole 2-4 on the double-ended connecting rod via an interference fit. Then, the ball head pin 1-1-1 of the first ball joint assembly 1-1 of the automotive connecting rod 1 is inserted into the fifth through hole 2-5, and then a fixing bolt is tightened through the fixing threaded hole 2-6 to secure the ball head pin 1-1-1. Next, the counterweight connecting bracket 7 is assembled onto the connecting rod 1-2, with the waist-shaped slot 7-3 having a clearance fit with the connecting rod 1-2. Finally, the counterweight 8 is assembled onto the counterweight connecting bracket 7, with the center hole 8-1 having a clearance fit with the first circular mating surface 7-8 of the counterweight connecting bracket 7, and the plane of the counterweight 8 fitting against the first counterweight step 7-1. Due to the straight design of the straight section 7-4 of the first counterweight step of the counterweight connecting bracket 7 and the straight design of the assembly opening 8-2 of the counterweight 8, the counterweight 8 can be stably placed on the counterweight connecting bracket 7. The design of the second counterweight step 7-2 allows for the placement of more mass blocks to meet the testing counterweight requirements.

[0136] This application also provides a high-temperature abnormal noise testing system for automotive connecting rods, the system comprising:

[0137] The high-temperature abnormal noise test fixture for automotive connecting rods provided in Example 3 is used to drive automotive connecting rod 1 to swing vertically under the action of test torque, and at the same time collect the critical state torque and the torque after movement of automotive connecting rod 1, and generate torque curve;

[0138] Vibration acceleration sensor 9 is fixed to the first ball joint assembly 1-1, which is fixed on the high temperature abnormal noise test fixture of the automobile connecting rod. It is used to collect the acceleration of the first ball joint assembly 1-1 during the test and transmit it to the host computer.

[0139] The host computer is connected to the vibration acceleration sensor 9 and the torque testing device 5 in the high temperature abnormal noise test fixture of the automobile connecting rod, and is used to evaluate whether there is high temperature abnormal noise in the automobile connecting rod 1 based on the torque curve of the automobile connecting rod 1 and the acceleration curve formed by the acceleration.

[0140] The operating platform 6 is used to place the torque testing device 5 to provide the space required for the swing of the vehicle connecting rod 1. In this application, the operating platform 6 needs to be at a certain height to ensure that the vehicle connecting rod 1 is in a vertically suspended state after assembly.

[0141] Based on the above technical means, it is possible to drive the car connecting rod 1 in a high-temperature state to simulate the vibration acceleration during the movement process. Furthermore, by using the vibration acceleration obtained from the test and the torque curve of the car connecting rod 1, it is possible to identify whether the car connecting rod 1 has high-temperature abnormal noise. This solves the problem of long verification cycle and complex verification process of high-temperature abnormal noise of car connecting rod 1 in traditional methods.

[0142] When assembling the aforementioned high-temperature abnormal noise testing system for automotive connecting rods, the torque testing device 5 is first placed on the operating table 6. The rotation axis 5-2 of the torque testing device 5 needs to extend beyond the boundary of the operating table 6 so that the automotive connecting rod 1 can swing vertically after assembly, allowing the double-ended connecting rod to be assembled with the torque testing device 5. After assembly, the vibration acceleration sensor 9 is fixed to the first ball joint assembly 1-1 of the automotive connecting rod 1. Then, the ball head pin 1-1-1 of the first ball joint assembly 1-1 is inserted into the fifth through hole 2-5 of the double-ended connecting rod, and the ball head pin 1-1-1 is fixed by torque through the fixing bolt passing through the fixing threaded hole 2-6. Finally, the counterweight assembly is assembled.

[0143] This application also provides a method for testing high-temperature abnormal noise in automotive connecting rods, the method being based on the aforementioned automotive connecting rod high-temperature abnormal noise testing system, such as... Figure 13 As shown, the method includes:

[0144] S11: Fix the vibration acceleration sensor 9 to the first ball joint assembly 1-1 of the connecting rod 1 of the vehicle under test;

[0145] S12: The fixed vibration acceleration sensor 9 and the connecting rod 1 of the car under test are heated at high temperature;

[0146] S13: Assemble the automotive connecting rod 1 to be tested onto the automotive connecting rod high-temperature abnormal noise test fixture, specifically including:

[0147] S131: Fix the first ball joint assembly 1-1 of the automotive connecting rod 1 to be tested, which has been heated to the required temperature, onto the connecting bracket 2;

[0148] S132: Assemble the counterweight assembly onto the connecting rod 1 of the vehicle under test;

[0149] S14: When the vehicle connecting rod 1 under test meets the required temperature, start the torque testing equipment 5 to perform the test;

[0150] S15: The acceleration of the first ball joint assembly 1-1 during the test is collected by the vibration acceleration sensor 9;

[0151] S16: The torque testing equipment 5 collects the critical state torque and the torque after movement of the automobile connecting rod 1, and generates a torque curve;

[0152] S17: The host computer evaluates whether there is high-temperature abnormal noise in the car connecting rod 1 based on the torque curve of the car connecting rod 1 and the acceleration curve formed by the acceleration.

[0153] The car connecting rod 1 is a ball joint structure, which will swing or rotate under force during operation. The torque testing device 5 rotates the connecting bracket 2 via the rotating shaft 5-2, and the rotating connecting bracket 2 drives the car connecting rod 1 to rotate. The first ball joint assembly 1-1 receives a driving force FN because the car connecting rod 1 is equipped with a counterweight 8. The driving force FN changes repeatedly with the swing of the car connecting rod 1, and the motion state is as follows. Figure 14 As shown. When the first ball joint assembly 1-1 is in the critical state before movement, the static friction force Fs it experiences is less than FN, resulting in acceleration a1. When the first ball joint assembly 1-1 is in motion, the dynamic friction force Fd it experiences generates acceleration a2. At the moment of transition between static and dynamic states, if a2 is much greater than a1, the large change in acceleration causes a large impact vibration, which will generate vibration noise, and the first ball joint assembly 1-1 will exhibit a "sticking" phenomenon. If the difference between a2 and a1 is small, the change in acceleration is small, resulting in slight impact vibration or no impact vibration, and the first ball joint assembly 1-1 will not exhibit a "sticking" phenomenon. Because the driving force FN changes repeatedly with the swing of the car connecting rod 1, the vibration acceleration sensor 9 can identify its acceleration and form an acceleration curve; the torque testing device 5 can identify the critical state torque and the torque after movement to form a torque curve. Through the vibration acceleration value curve and the torque curve, it is possible to accurately assess whether the connecting rod has high-temperature abnormal noise.

[0154] When a counterweight is installed on the automotive connecting rod 1, it will be subjected to a driving force FN. This force is similar to that experienced by the connecting rod in a real vehicle. Therefore, this test evaluation can simulate the evaluation of NVH abnormal noises in the whole vehicle, thereby reducing the resources and costs of whole vehicle NVH verification. It also solves the problem that the whole vehicle NVH verification cannot identify abnormal noises because the ambient temperature cannot meet the requirements. This allows the high-temperature abnormal noise problem of the connecting rod to be avoided from the part design stage, and the whole vehicle verification cycle and part development and rectification cycle to be shortened.

[0155] During the above test, the first ball joint assembly 1-1 of the heated automotive connecting rod 1 is fixed on the connecting bracket 2, with an estimated assembly time of 20 seconds. The counterweight connecting bracket 7 is then assembled onto the automotive connecting rod 1, with an estimated assembly time of less than 20 seconds. The counterweight block 8 is then assembled onto the counterweight connecting bracket 7, with an estimated assembly time of 20 seconds. After starting the torque testing equipment 5, the test time is estimated to be 90 seconds, and the entire test takes approximately 150 seconds. If the automotive connecting rod 1 is heated to 100°C in the high-temperature chamber, the temperature of the automotive connecting rod 1 after testing with this fixture can reach around 80°C, which is comparable to the temperature at which the connecting rod exhibits high-temperature abnormal noise on a real vehicle. The rapid assembly and testing of the fixture can meet the temperature requirements.

[0156] The above method heats the fixed vibration acceleration sensor 9 and the connecting rod 1 of the car under test separately. The heating cost is low and easy to implement. The test process is conducted in a normal temperature environment, which is friendly to the testers.

[0157] This application also provides a method for testing high-temperature abnormal noise in automotive connecting rods, the method being based on the aforementioned automotive connecting rod high-temperature abnormal noise testing system, such as... Figure 15 As shown, the method includes:

[0158] S21: Fix the vibration acceleration sensor 9 to the first ball joint assembly 1-1 of the connecting rod 1 of the vehicle under test;

[0159] S22: Assemble the automotive connecting rod 1 to be tested onto the automotive connecting rod high-temperature abnormal noise test fixture;

[0160] S23: Heat the entire tooling to the required temperature;

[0161] S24: When the vehicle connecting rod 1 under test meets the required temperature, start the torque testing equipment 5 to perform the test;

[0162] S25: The acceleration of the first ball joint assembly 1-1 during the test is collected by the vibration acceleration sensor 9;

[0163] S26: The torque testing equipment 5 collects the critical state torque and the torque after movement of the automobile connecting rod 1, and generates a torque curve;

[0164] S27: The host computer evaluates whether there is high-temperature abnormal noise in the car connecting rod 1 based on the torque curve of the car connecting rod 1 and the acceleration curve formed by the acceleration.

[0165] The above method uses vibration acceleration sensor 9 to collect the acceleration of the first ball joint assembly 1-1 under high temperature conditions during the test. Torque testing equipment 5 collects the critical torque and post-motion torque of the automotive connecting rod 1 and generates a torque curve. Based on the torque curve of the automotive connecting rod 1 and the acceleration curve formed by the acceleration, the presence of high-temperature abnormal noise in the automotive connecting rod 1 can be evaluated, shortening the high-temperature abnormal noise verification cycle. The verification method is simple and easy to implement, quickly identifying the risk of high-temperature abnormal noise in the automotive connecting rod, thereby avoiding abnormal noise from the part design stage, reducing the resources and costs of vehicle abnormal noise verification, and shortening the vehicle verification cycle and part development and rectification cycle. Directly heating the assembled entire tooling further ensures that the temperature of the automotive connecting rod 1 meets the test requirements during the test.

[0166] The above embodiments are merely preferred embodiments provided to fully illustrate this application, and the scope of protection of this application is not limited thereto. Equivalent substitutions or modifications made by those skilled in the art based on this application are all within the scope of protection of this application.

Claims

1. A high temperature abnormal sound test system for an automobile connecting rod, characterized by, The system comprises: The automobile connecting rod high-temperature abnormal sound test tool includes: The torque test device is fixedly connected with the connecting support, is used for providing the test torque required by the automobile connecting rod test under the required temperature, collecting the critical state torque and the post-movement torque of the automobile connecting rod, and generating a torque curve; The connecting support is used for fixing the first ball hinge assembly at one end of the automobile connecting rod and the torque test device; The counterweight assembly is detachably arranged on the automobile connecting rod, used for providing counterweight to make the automobile connecting rod swing in the vertical direction under the driving of the test torque; The vibration acceleration sensor is fixed with the first ball hinge assembly fixed on the automobile connecting rod high-temperature abnormal sound test tool, used for collecting the acceleration of the first ball hinge assembly in the test process and transmitting to the upper computer; The upper computer is connected with the vibration acceleration sensor and the torque test device in the automobile connecting rod high-temperature abnormal sound test tool, used for evaluating whether the automobile connecting rod has high-temperature abnormal sound according to the torque curve of the automobile connecting rod and the acceleration curve formed by the acceleration; when the first ball hinge assembly is in the critical state before movement, the acceleration a1 is generated; when the first ball hinge assembly is in the post-movement state, the acceleration a2 is generated, and when a2 is much larger than a1, the impact vibration caused by the change of acceleration is large, which will produce vibration noise, and the first ball hinge assembly internally shows "stuck" phenomenon; when the difference between a2 and a1 is small, the slight impact vibration or no impact vibration is caused by the small change of acceleration, and the first ball hinge assembly internally has no "stuck" phenomenon; The operation table is used for placing the torque test device in the automobile connecting rod high-temperature abnormal sound test tool to provide the space required by the automobile connecting rod swing.

2. The automotive connecting rod high temperature abnormal noise test system of claim 1, wherein, The torque test device comprises a torque test device main body and a rotating shaft, the torque test device main body is connected with the rotating shaft, and the rotating shaft is fixedly connected with the connecting support.

3. The automotive connecting rod high temperature abnormal noise test system of claim 2, wherein, The torque test device further comprises a connecting plate, a third through hole is formed in the middle of the connecting plate, the third through hole is used for interference fit fixing with the rotating shaft, and a plurality of connecting through holes are formed around the third through hole on the connecting plate.

4. The automotive connecting rod high temperature abnormal noise test system of claim 3, wherein, The connecting support comprises a closed first plate and a second plate, a second through hole for fixing a ball pin of the first ball hinge assembly is formed on the second plate, and the center line of the second through hole coincides with the center line of the third through hole; A plurality of connecting threaded holes corresponding to the plurality of connecting through holes are formed on the first plate, and the connecting support and the connecting plate are fixedly connected through bolts passing through the connecting through holes and the connecting threaded holes.

5. The automotive connecting rod high temperature abnormal noise test system of claim 4, wherein, The first plate is further provided with a first through hole, and the center line of the first through hole coincides with the center line of the third through hole.

6. The automotive connecting rod high temperature abnormal noise test system of claim 2, wherein, The connecting support comprises a double-headed connecting rod, a fourth through hole is formed at the first end of the double-headed connecting rod, the fourth through hole is used for interference fit fixing with the rotating shaft, a fifth through hole for fixing a ball pin of the first ball hinge assembly is formed at the second end of the double-headed connecting rod, and a plurality of fixing threaded holes extending to the fifth through hole are further formed on the side wall of the second end of the double-headed connecting rod.

7. The automotive connecting rod high temperature abnormal noise test system of claim 1, wherein, The counterweight assembly comprises a counterweight block, the counterweight block is provided with a center hole and an assembly opening, the assembly opening extends to communicate with the center hole to form an open ring shape.

8. The automotive connecting rod high temperature abnormal noise test system of claim 7, wherein, The counterweight assembly further comprises a counterweight connecting bracket, the counterweight connecting bracket is a three-step circular truncated cone, the counterweight connecting bracket is provided with a waist-shaped slot for connecting rod assembly of the automobile connecting rod, and the counterweight connecting bracket comprises a first counterweight step and a second counterweight step for placing the counterweight block.

9. A method for testing high-temperature abnormal sound of a connecting rod of an automobile, characterized by, The method is based on the automobile connecting rod high-temperature abnormal sound test system according to any one of claims 1-8, and the method comprises: Fixing the vibration acceleration sensor to the first ball hinge assembly of the automobile connecting rod to be tested; Assembling the automobile connecting rod to be tested on the automobile connecting rod high-temperature abnormal sound test tool; Starting the torque test device to test when the automobile connecting rod to be tested meets the required temperature; Collecting the acceleration of the first ball hinge assembly during the test by the vibration acceleration sensor; Collecting the critical state torque and the post-movement torque of the automobile connecting rod by the torque test device, and generating a torque curve; Evaluating whether the automobile connecting rod has high-temperature abnormal sound according to the torque curve of the automobile connecting rod and the acceleration curve formed by the acceleration.

10. The automotive connecting rod high temperature abnormal noise test method of claim 9, wherein, The method further comprises: After fixing the vibration acceleration sensor to the first ball hinge assembly of the automobile connecting rod to be tested, heating the fixed vibration acceleration sensor and the automobile connecting rod to be tested at high temperature; The automobile connecting rod high-temperature abnormal sound test tool comprises a connecting bracket, a counterweight assembly and a torque test device, the connecting bracket is provided with a first ball hinge assembly fixing hole and a counterweight assembly fixing hole, the first ball hinge assembly fixing hole is used for fixing the first ball hinge assembly of the automobile connecting rod to be tested, and the counterweight assembly fixing hole is used for fixing the counterweight assembly. The method further comprises: after assembling the automobile connecting rod to be tested on the automobile connecting rod high-temperature abnormal sound test tool, heating the entire tool to the required temperature. ​ 11. The automotive connecting rod high temperature abnormal noise test method of claim 9, wherein, ​

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