A testing device for automobile shock absorbing pulley

Abstract

The utility model relates to the technical field of automobile belt pulley, specifically relates to a kind of automobile shock absorbing pulley testing device, including fixed base, still include: driving motor, set in the top of the fixed base, the shaft end of the driving motor is connected with pulley drive shaft;Connecting sleeve wheel, set in the opposite side of the pulley drive shaft, the connecting sleeve wheel and fixed base horizontal sliding connection, the outside of the connecting sleeve wheel is evenly surrounded with telescopic sleeve.The utility model has adopted the design of surrounding contact measurement, through multiple independent radial movement contact roller, telescopic connecting rod and electromagnetic detection unit, the radial vibration of multiple points on the circumference of the belt pulley to be measured can be synchronously detected, the overall vibration form of belt pulley under complex stress state can be more comprehensively reflected, and the shock-absorbing performance and dynamic response characteristics of the shock-absorbing belt pulley under simulated working condition are evaluated.

Description

Technical Field

[0001] This utility model relates to the field of automotive pulley technology, and in particular to a testing device for automotive shock absorber pulleys. Background Technology

[0002] The shock absorber pulley is a key component in the front-end accessory drive system of an automobile engine. Its main function is to absorb and attenuate the periodic torsional vibration transmitted from the engine crankshaft through built-in damping elements such as rubber, silicone oil, or springs. If this vibration is not treated, it will be directly transmitted to accessories such as alternators, air conditioning compressors, and water pumps, leading to abnormal wear of accessory belts, increased noise, and even premature failure of accessory assemblies. This seriously affects the reliability, performance, and service life of the entire drive system. Therefore, the dynamic performance of the shock absorber pulley is directly related to the overall working efficiency of the front-end accessory drive system of the engine.

[0003] Currently, the commonly used devices for testing and evaluating the performance of vibration damping pulleys rely on accelerometers to collect vibration signals. These devices typically mount the vibration damping pulley under test on a test bench, simulate its rotational state during operation by driving a motor, and use accelerometers fixed in specific positions, such as radial or axial, to detect its vibration response. However, accelerometers are usually only sensitive to linear vibrations in the direction of their sensitive axis, while the vibration mode exhibited by vibration damping pulleys in actual operation is a complex spatial motion. Measuring acceleration in only a single or limited direction cannot comprehensively and accurately capture and characterize the core vibration damping performance of the vibration damping pulley, and the test results deviate from the actual working conditions of the component. Utility Model Content

[0004] In view of this, the purpose of this utility model is to propose a test device for automotive shock absorber pulleys, so as to solve the problem that current automotive shock absorber pulley test equipment can only perform acceleration measurement in a single or limited direction.

[0005] To achieve the above objectives, this utility model provides a testing device for automotive shock absorber pulleys, including a fixed base, and further comprising: A drive motor is disposed above the fixed base, and a pulley drive shaft is connected to the shaft end of the drive motor; A connecting sleeve is located on the opposite side of the pulley drive shaft. The connecting sleeve is horizontally slidably connected to the fixed base. A telescopic sleeve is evenly arranged around the outer side of the connecting sleeve, and a detection coil is arranged in the middle of the telescopic sleeve. A telescopic connecting rod is nested and slidably disposed inside the telescopic sleeve. A detection magnet is disposed in the middle of the telescopic connecting rod, and a buffer spring is disposed on the outer side of the telescopic connecting rod. An adjusting connecting frame is provided at the inner end of the telescopic connecting rod. A contact roller is rotatably provided in the middle of the adjusting connecting frame. The contact roller is arranged parallel to the pulley drive shaft. A vibration generating mechanism is located on the outside of the drive motor, and an acceleration sensor is located in the middle of the drive motor.

[0006] Furthermore, a reset electromagnet is provided at the outer end of the telescopic sleeve, and a magnetic traction block is connected to the outer end of the telescopic connecting rod.

[0007] Furthermore, a flexible connecting seat is provided below the drive motor, and the drive motor is connected to the fixed base through the flexible connecting seat.

[0008] Furthermore, the vibration generating mechanism includes a vibration motor, the shaft end of which is connected to a vibration drive shaft, and the outer end of the vibration drive shaft is connected to an eccentric vibration wheel.

[0009] Furthermore, an adjusting groove is vertically arranged in the middle of the eccentric vibrating wheel, and a connecting slider is slidably fitted inside the adjusting groove, with the eccentric vibrating wheel and the connecting slider being connected to each other.

[0010] Furthermore, an adjusting sleeve is provided in the middle of the connecting slider, and an adjusting screw is provided in the middle of the adjusting groove. The connecting slider is connected to the adjusting sleeve and the adjusting screw.

[0011] The beneficial effects of this utility model are as follows: As can be seen from the above description, the automotive shock absorber pulley testing device provided by this utility model adopts a surround contact measurement design. Through multiple independently radially movable contact rollers, telescopic connecting rods, and electromagnetic detection units, it can simultaneously detect the radial vibration of multiple points on the circumference of the pulley under test. This overcomes the limitation of traditional single acceleration sensors that can only detect linear vibration in a single direction. It can more comprehensively reflect the overall vibration mode of the pulley under complex stress conditions and evaluate the shock absorption performance and dynamic response characteristics of the shock absorber pulley under simulated working conditions. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only for this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 This is a front structural diagram of an embodiment of the present utility model; Figure 2This is a schematic diagram of the connecting sleeve of an embodiment of the present utility model; Figure 3 This is a schematic diagram of the structure of the telescopic sleeve according to an embodiment of the present utility model; Figure 4 This is a schematic diagram of the eccentric vibrating wheel according to an embodiment of the present invention.

[0014] The diagram is marked as follows: 1. Fixed base; 2. Belt pulley drive shaft; 201. Drive motor; 202. Accelerometer sensor; 203. Flexible connecting seat; 3. Vibration motor; 301. Vibration drive shaft; 4. Eccentric vibration wheel; 401. Adjusting slide; 402. Connecting slider; 403. Adjusting sleeve; 404. Adjusting screw; 5. Connecting sleeve; 501. Telescopic sleeve; 502. Detection coil; 503. Reset electromagnet; 6. Contact roller; 601. Adjusting connecting frame; 602. Telescopic connecting rod; 603. Detection magnet; 604. Buffer spring; 605. Magnetic traction block. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments.

[0016] It should be noted that, unless otherwise defined, the technical or scientific terms used in this utility model should have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The terms "first," "second," and similar terms used in this utility model do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0017] like Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, a test device for automotive shock absorber pulleys includes a fixed base 1, and further includes: A drive motor 201 is mounted above the fixed base 1, and a pulley drive shaft 2 is connected to the shaft end of the drive motor 201. A connecting sleeve 5 is located on the opposite side of the belt pulley drive shaft 2. The connecting sleeve 5 is horizontally slidably connected to the fixed base 1. A telescopic sleeve 501 is evenly arranged around the outer side of the connecting sleeve 5, and a detection coil 502 is arranged in the middle of the telescopic sleeve 501. The telescopic connecting rod 602 is nested and slidably disposed inside the telescopic sleeve 501. A detection magnet 603 is disposed in the middle of the telescopic connecting rod 602, and a buffer spring 604 is disposed on the outer side of the telescopic connecting rod 602. An adjusting connecting frame 601 is located at the inner end of the telescopic connecting rod 602. A contact roller 6 is rotatably provided in the middle of the adjusting connecting frame 601. The contact roller 6 and the belt pulley drive shaft 2 are arranged parallel to each other. The vibration generating mechanism is located on the outside of the drive motor 201, and the acceleration sensor 202 is located in the middle of the drive motor 201.

[0018] In this embodiment, the device mounts the pulley to be tested via the pulley drive shaft 2, then moves the connecting sleeve 5 assembly horizontally so that it nests around the outside of the pulley to be tested. Next, multiple adjusting connecting brackets 601, evenly arranged around the connecting sleeve 5, are brought together towards the center until the contact rollers 6 at their ends are tightly pressed against the outer circumference of the pulley to be tested. This surrounding contact design ensures comprehensive and stable contact with the outer circumference of the pulley. Then, the drive motor 201 starts operating, driving the pulley to be tested to rotate at a set speed via the pulley drive shaft 2, simulating its actual working state. Simultaneously, the vibration generating mechanism located outside the drive motor 201 starts operating, generating mechanical vibrations of a specific frequency and amplitude. This vibration is transmitted to the pulley to be tested via the drive motor 201, forcing it to generate composite vibrations while rotating. When the pulley to be tested vibrates, its… A tiny radial displacement occurs on the outer circumference surface, which directly acts on each contact roller 6 in contact with it. The contact roller 6 transmits the radial force it receives to the telescopic connecting rod 602 through the adjusting connecting frame 601 behind it. The telescopic connecting rod 602 then slides back and forth nested inside the telescopic sleeve 501, thereby directly and accurately converting the radial vibration of the pulley in multiple directions into the linear reciprocating motion of the telescopic connecting rod 602. During the reciprocating motion of the telescopic connecting rod 602, the detection magnet 603 fixed inside it moves synchronously. The detection magnet 603 and the detection coil 502 fixed inside the telescopic sleeve 501 constitute a miniature electromagnetic induction system. According to the law of electromagnetic induction, the displacement of the detection magnet 603 relative to the detection coil 502 will change the magnetic flux passing through the coil, thereby generating an induced electromotive force in the coil. By analyzing the characteristics of the electrical signal, the instantaneous displacement and velocity of the telescopic connecting rod 602 can be accurately calculated. These data directly correspond to the radial vibration amplitude and velocity of the pulley under test at the corresponding contact point. Simultaneously, the accelerometer 202 installed in the middle of the drive motor 201 synchronously collects the vibration signal of the drive shaft system. Finally, by comprehensively analyzing and comparing the multi-point radial data obtained by multiple detection coils 502 with the data obtained by the accelerometer 202, the damping performance and dynamic response characteristics of the shock-absorbing pulley under simulated working conditions can be comprehensively and three-dimensionally evaluated. Thus, the device adopts a surround contact measurement design. Through multiple independently radially movable contact rollers 6, telescopic connecting rods 602, and electromagnetic detection units, it can synchronously detect the radial vibration of multiple points on the circumference of the pulley under test. This overcomes the limitation of the traditional single accelerometer 202, which can only detect linear vibration in a single direction. It can more comprehensively reflect the overall vibration mode of the pulley under complex stress conditions and evaluate the damping performance and dynamic response characteristics of the shock-absorbing pulley under simulated working conditions.

[0019] like Figure 1 , Figure 2 , Figure 3 , Figure 4As shown, preferably, when the device needs to install the pulley to be tested, the operator energizes the reset electromagnet 503 located at the outer end of the telescopic sleeve 501. The reset electromagnet 503 then generates a strong magnetic attraction force, attracting the magnetic traction block 605 fixed at the outer end of the telescopic connecting rod 602. This attraction force overcomes the preload of the buffer spring 604, driving the telescopic connecting rod 602 to slide inward along the telescopic sleeve 501. The inward movement of the telescopic connecting rod 602, through the adjustment of the connecting frame 601, drives the contact roller 6 at its end to move away from the central axis of the device, thereby creating sufficient installation space. At this time, the operator can easily place the pulley to be tested onto the pulley drive shaft 2 without overcoming the pressure of multiple buffer springs 604, and the operation is smooth. Once the pulley is in place, the reset electromagnet 503 is de-energized, and the magnetic attraction disappears instantly. At this time, the compressed buffer spring 604 releases its elastic potential energy, pushing the telescopic connecting rod 602 and its magnetic traction block 605 to move outward in the opposite direction. This movement ultimately drives all the surrounding contact rollers 6 to move smoothly and synchronously inward until they are tightly and evenly pressed against the outer circumference of the pulley under test, establishing a stable initial contact state for subsequent testing. When the pulley needs to be unloaded after the test, the process is similar. The reset electromagnet 503 is energized again, attracting the magnetic traction block 605 and causing the contact rollers 6 to retract and make room, so that the pulley can be easily removed from the drive shaft. The entire loading and unloading process is more efficient and convenient, which helps to improve testing efficiency.

[0020] like Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, preferably, the device has a flexible connecting seat 203 below the drive motor 201. The drive motor 201 is connected to the fixed base 1 below through this flexible connecting seat 203. The flexible connecting seat 203 is made of a material with good elasticity and damping properties, such as rubber, polyurethane or other polymer composite materials, or adopts a mechanical structure combining springs and dampers. Its core function is to act as a low-stiffness vibration isolator. When the vibration generating mechanism is working, the drive motor 201 and its shaft system will generate strong excitation vibration for testing. At this time, the flexible connecting seat 203 will undergo controllable elastic deformation, effectively absorbing and attenuating most of the vibration energy generated by the drive motor 201, thereby isolating the vibration near the motor unit and preventing it from being transmitted to the fixed base structure. This avoids the contamination of the measurement signal by external vibration and improves the accuracy and reliability of the test results.

[0021] like Figure 1 , Figure 2 , Figure 3 , Figure 4As shown, preferably, the core component of the vibration generating mechanism used to generate simulated vibration excitation includes a vibration motor 3. The output shaft of the vibration motor 3 is directly connected to a vibration drive shaft 301. An eccentric vibration wheel 4 is fixedly installed at the outer end of the vibration drive shaft 301. When it is necessary to simulate vibration conditions, the vibration motor 3 is started, and the rotational power generated is transmitted to the eccentric vibration wheel 4 at the end through the vibration drive shaft 301. Since the center of mass of the eccentric vibration wheel 4 does not coincide with its center of rotation, a continuous and regularly changing centrifugal force is generated when rotating at high speed. This centrifugal force serves as the excitation source and is transmitted through the vibration drive shaft 301 and the vibration motor 3 body to the drive motor 201, which is rigidly connected to the vibration motor 3. This drives the entire drive motor 201 unit to generate a mechanical vibration with stable amplitude and controllable frequency. By controlling the rotational speed of the vibration motor 3, the vibration frequency can be precisely and linearly adjusted.

[0022] like Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, preferably, the eccentric vibrating wheel 4 of the device is designed with adjustable eccentricity. Specifically, an adjusting groove 401 is vertically arranged in the middle of the eccentric vibrating wheel 4. A connecting slider 402 is slidably fitted inside the adjusting groove 401. This connecting slider 402 is connected to the outer end of the vibration drive shaft 301, thereby transmitting the rotational power of the vibration motor 3 to the eccentric vibrating wheel 4. To adjust the eccentricity, an adjusting sleeve 403 is fixedly installed in the middle of the connecting slider 402. Correspondingly, an adjusting screw 404 is arranged along the length of the adjusting groove 401. The adjusting screw 404 and the adjusting sleeve 403 form a helical pair. When it is necessary to change the vibration intensity, the adjusting screw 404 can be rotated with a tool. The rotation of the adjusting screw 404 will drive the adjusting sleeve 403 that meshes with it, thereby driving the entire connecting slider 402 to move vertically along the adjusting groove 401. The sliding displacement of the connecting slider 402 directly changes the center of mass distribution of the entire rotating system, that is, it changes the equivalent eccentricity between the center of rotation and the center of mass. When the connecting slider 402 slides to a position away from the center of rotation, the equivalent eccentricity increases, and the centrifugal force generated at the same rotation speed also increases, thus enhancing the vibration amplitude. Conversely, when the connecting slider 402 slides to a position closer to the center of rotation, the equivalent eccentricity decreases, and the excitation force and vibration amplitude generated also weaken. Through this mechanism, the operator can achieve stepless and precise adjustment of the vibration amplitude without replacing the entire eccentric wheel, so as to accurately match different test standards or simulate various severe road conditions and engine operating conditions, thus expanding the testing capabilities of the device.

[0023] The automotive shock absorber pulley testing device provided by this utility model adopts a surround contact measurement design. Through multiple independently radially movable contact rollers 6, telescopic connecting rods 602, and electromagnetic detection units, it can simultaneously detect the radial vibration of multiple points on the circumference of the pulley under test. This overcomes the limitation of the traditional single acceleration sensor 202, which can only detect linear vibration in a single direction. It can more comprehensively reflect the overall vibration mode of the pulley under complex stress conditions and evaluate the shock absorption performance and dynamic response characteristics of the shock absorber pulley under simulated working conditions.

[0024] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of this utility model is limited to these examples; within the framework of this utility model, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of this utility model as described above, which are not provided in the details for the sake of brevity. Any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A testing device for automotive shock absorber pulleys, comprising a fixed base (1), characterized in that, Also includes: A drive motor (201) is disposed above the fixed base (1), and a belt pulley drive shaft (2) is connected to the shaft end of the drive motor (201); A connecting sleeve (5) is located on the opposite side of the belt pulley drive shaft (2). The connecting sleeve (5) is horizontally slidably connected to the fixed base (1). A telescopic sleeve (501) is uniformly arranged around the outside of the connecting sleeve (5). A detection coil (502) is arranged in the middle of the telescopic sleeve (501). A telescopic connecting rod (602) is nested and slidably disposed inside the telescopic sleeve (501). A detection magnet (603) is disposed in the middle of the telescopic connecting rod (602), and a buffer spring (604) is disposed on the outer side of the telescopic connecting rod (602). An adjusting connecting frame (601) is provided at the inner end of the telescopic connecting rod (602). A contact roller (6) is rotatably provided in the middle of the adjusting connecting frame (601). The contact roller (6) is arranged parallel to the pulley drive shaft (2). A vibration generating mechanism is located on the outside of the drive motor (201), and an acceleration sensor (202) is located in the middle of the drive motor (201).

2. The automotive shock absorber pulley testing device according to claim 1, characterized in that, The outer end of the telescopic sleeve (501) is provided with a reset electromagnet (503), and the outer end of the telescopic connecting rod (602) is connected with a magnetic traction block (605).

3. The automotive shock absorber pulley testing device according to claim 1, characterized in that, A flexible connecting seat (203) is provided below the drive motor (201), and the drive motor (201) is connected to the fixed base (1) through the flexible connecting seat (203).

4. The automotive shock absorber pulley testing device according to claim 1, characterized in that, The vibration generating mechanism includes a vibration motor (3), the shaft end of which is connected to a vibration drive shaft (301), and the outer end of the vibration drive shaft (301) is connected to an eccentric vibration wheel (4).

5. The automotive shock absorber pulley testing device according to claim 4, characterized in that, An adjusting groove (401) is vertically arranged in the middle of the eccentric vibrating wheel (4), and a connecting slider (402) is slidably fitted inside the adjusting groove (401). The eccentric vibrating wheel (4) and the connecting slider (402) are connected to each other.

6. The automotive shock absorber pulley testing device according to claim 5, characterized in that, An adjusting sleeve (403) is provided in the middle of the connecting slider (402), and an adjusting screw (404) is provided in the middle of the adjusting groove (401). The connecting slider (402) is connected to the adjusting screw (404) through the adjusting sleeve (403).

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