Torsional vibration testing apparatus for power transmission systems

Abstract

The present disclosure provides a torsional vibration testing device for a power transmission system, comprising: a gear disc device, comprising at least one detection gear disc, the detection gear disc comprising a wheel disc and a plurality of detection gears integrally arranged on the wheel disc along the periphery of the wheel disc and uniformly arranged in the circumferential direction of the wheel disc, the detection gear disc being configured to be connected in the power transmission system to replace a corresponding transmission component, the wheel disc comprising a connecting structure configured to connect a transmission component in the power transmission system connected to the corresponding transmission component to be replaced; a sensing device, comprising at least one sensor corresponding to the at least one detection gear disc, the sensor being configured to be used with the corresponding detection gear disc to obtain rotation information thereof; and a control device, in signal connection with the sensing device, configured to receive the rotation information and calculate and output torsional vibration information of the power transmission system according to the rotation information. The torsional vibration testing device is beneficial to improve testing accuracy and save testing time.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of power transmission system testing, in particular to a torsional vibration testing device. BACKGROUND

[0002] The power transmission system of an engineering vehicle is a multi-degree-of-freedom torsional vibration system. The torsional vibration generated by the power transmission system when the engineering vehicle is working makes the power performance of the power transmission system not fully developed, the economy deteriorates, and at the same time, the passability, steering stability and smoothness of the engineering vehicle are affected, and the passengers are prone to feel uncomfortable and tired.

[0003] The excitation sources of the torsional vibration of the power transmission system of the engineering vehicle are:

[0004] 1. The output torque imbalance caused by the change of the gas pressure in the cylinder and the change of the inertia force of the crankshaft connecting rod mechanism, and the change of the engine torque caused by the operation and the working process, are the main excitation sources of the torsional vibration of the power transmission system;

[0005] 2. When the power transmission system has an axial angle, even if the input speed is constant, the output speed will also have periodic fluctuations, and the excitation vibration generated thereby will possibly lead to the resonance of the power transmission system;

[0006] 3. The load fluctuation in the gear meshing process of the transmission is the main excitation source of the transmission itself;

[0007] 4. The unbalanced mass of the rotating parts such as tires, hubs and brake discs, and the excitation of uneven roads, can all cause the torsional vibration of the power transmission system.

[0008] When the excitation frequency of the torsional vibration is consistent with the natural frequency of the power transmission system, torsional resonance occurs, at this time, a larger torsional amplitude is often generated in some sections of the power transmission system, forming a large resonance load, the dynamic stress caused thereby is generally much higher than the static working stress, leading to a significant reduction in the fatigue life of the related parts, affecting the working reliability of the related parts, and even producing negative torque, causing knocking between the gear pairs and spline pairs, producing uncomfortable noise, and in severe cases, even causing damage to the power transmission system parts due to insufficient strength, affecting the working reliability and service life of the power transmission system. At the same time, the torsional vibration of the power transmission system and the whole vehicle vibration of the engineering vehicle not only have their own natural vibration characteristics, but also have vibration coupling (which is generally considered to exist in the drive axle), which can cause the whole vehicle vibration of the engineering vehicle.

[0009] Due to the complex and variable structure of the power transmission system of the engineering vehicle, the torsional vibration response under multiple excitations is accurately measured through torsional vibration testing when the engineering vehicle is designed and the parts are selected, and then the characteristics of the torsional vibration are studied and the matching mechanism is mastered.

[0010] The main test methods for torsional vibration test of power transmission system are road test method and bench test method (drum test bench). The sensors used for test and the measured shaft are generally installed in a non-contact manner and measured in a digital manner. The sensors used for test include magneto-electric sensor, photoelectric sensor and photoelectric encoder, etc. For example, the magneto-electric type measurement method using magneto-electric sensor can be used for non-contact measurement.

[0011] In the related technology of using magneto-electric type measurement method for digital measurement of torsional vibration of power transmission system, when testing the torsional vibration of power transmission system, a uniformly indexed signal tooth disc is generally installed at the test point of the transmission shaft of the power transmission system. The magneto-electric sensor is fixed outside the signal tooth disc. When the signal tooth disc rotates with the transmission shaft, the original magneto-electric pulse signal sensed by the magneto-electric sensor opposite to the signal tooth disc is shaped to form a square wave pulse signal. The duty cycle of the square wave pulse signal output by the magneto-electric sensor is counted by a high-frequency clock pulse, and the corresponding time of the square wave pulse interval of the square wave pulse signal is obtained through conversion. The host computer reads the time series from the single-chip microcomputer buffer area, and processes the time series to extract the torsional vibration signal.

[0012] When testing the torsional vibration of power transmission system, the signal tooth disc needs to be designed and processed according to the installation space of the measured point and the arrangement of the power transmission system. During test, the signal tooth disc is installed on the outer periphery of the corresponding transmission component, the installation gap between the signal tooth disc and the corresponding transmission component is adjusted to meet the coaxiality requirement of the outer circle of the signal tooth disc and the corresponding transmission component. The magneto-electric sensor is fixed on the vehicle frame through a bracket, and the perpendicularity and gap between the head of the magneto-electric sensor and the outer circle of the signal tooth disc are ensured to meet the test requirements. SUMMARY

[0013] The purpose of the present disclosure is to provide a torsional vibration test device for power transmission system, aiming to improve test accuracy and save test time.

[0014] The present disclosure provides a torsional vibration test device for power transmission system, comprising:

[0015] a tooth disc device, comprising at least one detection tooth disc, the detection tooth disc comprising a wheel disc and a plurality of detection teeth integrally arranged on the outer periphery of the wheel disc along the circumferential direction of the wheel disc, the detection tooth disc being configured to be connected in the power transmission system to replace the corresponding transmission component of the power transmission system, the wheel disc comprising a connecting structure, the connecting structure of the wheel disc being configured to connect the transmission component connected with the replaced corresponding transmission component in the power transmission system; and

[0016] The sensing device comprises at least one sensor corresponding to the at least one detection gear plate, and the sensor is configured to cooperate with the corresponding detection gear plate to obtain the rotation information of the corresponding detection gear plate.

[0017] The control device is in signal connection with the sensing device, configured to receive the rotation information and calculate and output the torsional vibration information of the power transmission system according to the rotation information.

[0018] In some embodiments of the torsional vibration testing device,

[0019] The at least one detection gear plate comprises a first detection gear plate and a second detection gear plate for replacing two transmission components at the axial two ends of the transmission component to be detected of the power transmission system, and the first detection gear plate and the second detection gear plate are configured to be connected to the axial two ends of the transmission component to be detected of the power transmission system respectively when detecting;

[0020] The sensing device comprises a first sensor corresponding to the first detection gear plate and a second sensor corresponding to the second detection gear plate, and the rotation information comprises first rotation information of the first detection gear plate obtained by the first sensor and second rotation information of the second detection gear plate obtained by the second sensor.

[0021] In some embodiments of the torsional vibration testing device,

[0022] The transmission component to be detected is an elastic coupling between an engine flywheel and a shaft joint flange of the power transmission system,

[0023] The first detection gear plate is configured to replace the engine flywheel when detecting, and the connecting structure of the first detection gear plate comprises an engine connecting part for connecting with an engine output shaft of the power transmission system and a first coupling connecting part for connecting with an axial first end of the elastic coupling;

[0024] The second detection gear plate is configured to replace the shaft joint flange when detecting, and the connecting structure of the second detection gear plate comprises a second coupling connecting part for connecting with an axial second end of the elastic coupling and a transmission shaft connecting part for connecting with a transmission shaft of the power transmission system.

[0025] In some embodiments of the torsional vibration testing device, the sensor is a magneto-electric sensor or a photoelectric sensor.

[0026] In some embodiments of the torsional vibration testing device, a mounting bracket is further included, and the mounting bracket is configured to support the sensor.

[0027] In some embodiments of the torsional vibration testing device, the mounting position of the sensor supported by the mounting bracket is adjustably arranged.

[0028] In some embodiments of the torsional vibration testing device,

[0029] The mounting position of the mounting bracket is adjustably arranged; and / or

[0030] The mounting bracket comprises two or more mounting assemblies, and the assembly position of at least two of the mounting assemblies is adjustably arranged; and / or

[0031] The mounting position of the sensor on the mounting bracket is adjustably arranged.

[0032] In some embodiments of the torsional vibration testing device, the mounting bracket comprises a mounting base, and the mounting base comprises a first long slot for fixing the mounting bracket, and the first long slot is configured to cooperate with a bolt to fix the mounting base.

[0033] In some embodiments of the torsional vibration testing device, the mounting bracket comprises two or more mounting assemblies, and the assembly position of at least two of the mounting assemblies is adjustably arranged, and the at least two mounting assemblies comprise:

[0034] A mounting base;

[0035] A sensor mounting seat comprising a sensor mounting portion, and the sensor mounting seat is adjustably arranged on the mounting base.

[0036] In some embodiments of the torsional vibration testing device, the mounting bracket comprises:

[0037] A screw rod passing through the mounting base and the sensor mounting seat, and the length direction of the screw rod is arranged at an angle with the extension direction of the first long slot; and

[0038] A plurality of lock nuts for locking the screw rod to the mounting base and the sensor mounting seat.

[0039] In some embodiments of the torsional vibration testing device,

[0040] The mounting base has a second long slot;

[0041] The sensor mounting seat has a third long slot arranged at an angle with the second long slot, and the sensor mounting seat is connected by a threaded connector passing through the second long slot and the third long slot.

[0042] In the torsional vibration testing device of some embodiments, the detection gear plate is configured to have the same rotational inertia as the corresponding transmission component in the power transmission system that is replaced.

[0043] In the torsional vibration testing device of some embodiments, the connecting structure of the wheel plate is configured to be the same as the connecting structure of the corresponding transmission component in the power transmission system that is replaced for connecting with the transmission component.

[0044] The torsional vibration testing device for the power transmission system provided based on the present disclosure, since the detection gear plate is directly used to replace the corresponding transmission component of the power transmission system under test during testing, and then the rotational information of the detection gear plate is acquired by the sensor as the rotational information of the corresponding transmission component in the power transmission system to acquire the torsional vibration information of the power transmission system, since the plurality of detection teeth of the detection gear plate are integrally arranged with the wheel plate, the machining error of the detection teeth can be effectively controlled, there is no installation error between the detection teeth and the wheel plate as in the related art between the signal gear plate and the corresponding transmission component, and the installation and debugging are convenient, which is conducive to improving the testing accuracy and saving testing time.

[0045] Other features of the present disclosure and its advantages will become apparent from the following detailed description of exemplary embodiments of the present disclosure with reference to the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0046] The drawings described herein are used to provide further understanding of the present disclosure, form a part of the present application, and the illustrative embodiments of the present disclosure and their descriptions are used to explain the present disclosure, and do not constitute improper limitations on the present disclosure. In the drawings:

[0047] Figure 1 A schematic structural diagram of a torsional vibration testing device for a power transmission system according to an embodiment of the present disclosure, wherein a detection gear plate of the torsional vibration testing device is installed in the power transmission system to replace a corresponding transmission component.

[0048] Figure 2 A schematic structural diagram of a torsional vibration testing device for a power transmission system according to an embodiment of the present disclosure, wherein an example of a control device is schematically shown. DETAILED DESCRIPTION

[0049] With reference to the drawings and the embodiments of the present disclosure, the technical solutions in the embodiments of the present disclosure will be described clearly and completely. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, rather than all the embodiments of the present disclosure. The description of the at least one example embodiment is merely illustrative in nature and not intended to be limiting on the present disclosure and its applications or uses. Based on the embodiments in the present disclosure, all other embodiments obtained by those of ordinary skill in the art without creative efforts are within the scope of the present disclosure.

[0050] The relative arrangement, numerical expressions, and numerical values of the components and steps set forth in the embodiments are not intended to limit the scope of the present disclosure unless otherwise specifically stated. Meanwhile, it should be understood that the sizes of the various parts shown in the drawings are not drawn in accordance with the actual proportional relationship for the convenience of description. The techniques, methods, and devices known to those of ordinary skill in the related art can not be discussed in detail, but should be considered as part of the authorized description where appropriate. In all examples shown and discussed herein, any specific values should be interpreted as merely exemplary and not as limiting. Therefore, other examples of the example embodiments can have different values. It should be noted that similar reference numbers and letters represent similar items in the following drawings, and therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0051] In the description of the present disclosure, it should be understood that the use of the words "first", "second", and the like to qualify components is merely for the convenience of distinguishing the corresponding components, and the above words have no special meaning unless otherwise stated, and therefore cannot be understood as limiting the scope of protection of the present disclosure.

[0052] In the description of the present disclosure, it should be understood that the orientation or position relationship indicated by the orientation words is generally based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present disclosure and simplifying the description, and in the absence of the opposite indication, these orientation words do not indicate and imply that the indicated device or element must have a particular orientation or be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the scope of protection of the present disclosure; the orientation words "inner, outer" refer to the inner and outer relative to the contour of each component.

[0053] In the process of implementing the present disclosure, the inventors found that the related art has the following deficiencies:

[0054] 1. The signal disc corresponding to the corresponding transmission components of the power transmission system needs to be designed, processed and installed, which is inconvenient to install and debug, and the test period is long.

[0055] 2. Manufacturing and installation errors of the signal gear plate can cause eccentric mass, affecting the dynamic balance of the power transmission system and easily leading to bending vibration or bending-torsional coupling resonance of the drive shaft. The changes in magnetic gap and relative motion between the magnetoelectric sensor and the measuring gear plate caused by bending vibration or bending-torsional coupling resonance will affect the voltage frequency modulation and amplitude modulation of the original magnetoelectric pulse signal, thus affecting the accuracy of torsional vibration analysis.

[0056] 3. Installing an independent signal gear is equivalent to installing a moment of inertia on the corresponding transmission component, which changes the vibration characteristics of the test target.

[0057] 4. Due to factors such as processing errors and installation errors, the precise installation position of the magnetoelectric sensor is not easy to guarantee, which will directly affect the quality of the torsional vibration test signal.

[0058] Based on this, the present disclosure provides a torsional vibration testing device 10 for a power transmission system. For example... Figure 1 As shown, the torsional vibration testing device 10 in this embodiment includes a toothed disc device, a sensing device, and a control device 15.

[0059] like Figure 1 As shown, the gear disk device includes at least one detection gear disk. The detection gear disk includes a wheel and a plurality of detection teeth integrally disposed on the outer periphery of the wheel and evenly arranged circumferentially along the wheel. The detection gear disk is configured to be connected to the power transmission system during detection to replace a corresponding transmission component of the power transmission system. The wheel includes a connecting structure, which is configured to connect a transmission component in the power transmission system that is connected to the corresponding transmission component being replaced.

[0060] The sensing device includes at least one sensor disposed corresponding to at least one detection tooth of the toothed disk assembly, the sensor being configured to cooperate with the corresponding detection tooth to obtain rotation information of the corresponding detection tooth.

[0061] The control device 15 is connected to the sensing device and is configured to receive rotation information and calculate and output torsional vibration information of the power transmission system based on the rotation information.

[0062] When performing torsional vibration testing on a power transmission system using the torsional vibration testing device of this embodiment, the detection toothed disc directly replaces the corresponding transmission component of the power transmission system under test. Then, the rotation information of the detection toothed disc is obtained by the sensor as the rotation information of the corresponding transmission component in the power transmission system to obtain the torsional vibration information of the power transmission system. Since the multiple detection toothed discs of the detection toothed disc are integrated with the wheel, the machining error of the detection teeth can be effectively controlled. There is no installation error between the detection teeth and the wheel as in the related technology between the signal toothed disc and the corresponding transmission component. Furthermore, the installation and debugging are convenient, thereby saving testing time.

[0063] Since the detection gear disc directly replaces the corresponding transmission components of the power transmission system for torsional vibration testing, compared with related technologies, there is no eccentric mass caused by the manufacturing and installation errors of the signal gear disc. The impact on the dynamic balance of the power transmission system can be reduced by improving the manufacturing and installation accuracy of the detection gear disc. This can alleviate the bending vibration or bending-torsional coupling resonance phenomenon of the transmission shaft caused by the signal gear disc, thereby reducing the change in magnetic gap and relative motion between the magnetoelectric sensor and the measuring gear disc caused by bending vibration or bending-torsional coupling resonance, improving the accuracy of torsional vibration analysis, and thus improving the accuracy of testing.

[0064] The size, structure, material, and machining precision of the detection gear disc can be set according to the size and structure of the corresponding transmission component being replaced. For example, the number of detection teeth on the detection gear disc determines the number of pulses detected by the sensor, and the number of pulses determines the detection precision. The structure and number of detection teeth can be set according to the detection requirements, and different detection parts correspond to different modules.

[0065] The test gear is configured to have the same moment of inertia as the corresponding transmission component that is being replaced in the powertrain system. This setup allows for a better simulation of the actual operation of the powertrain system during torsional vibration testing.

[0066] The wheel's connection structure is configured to be identical to the connection structure of the corresponding transmission component being replaced in the power transmission system, used for connecting to the connected transmission component. The connection between the test wheel and the connected transmission component is identical to the connection between the replaced transmission component and the adjacent component. This setup allows for better simulation of the actual operation of the power transmission system during torsional vibration testing.

[0067] like Figure 1 As shown, in some embodiments, at least one detection gear of the gear disk device includes a first detection gear disk 11 and a second detection gear disk 12. The first detection gear disk 11 and the second detection gear disk 12 replace two transmission components at both axial ends of the transmission component to be tested in the power transmission system. The first detection gear disk 11 and the second detection gear disk 12 are configured to be connected to the axial ends of the transmission component to be tested in the power transmission system, respectively, during testing. The sensing device includes a first sensor 13 corresponding to the first detection gear disk 11 and a second sensor 14 corresponding to the second detection gear disk 12. The rotation information includes first rotation information of the first detection gear disk 11 acquired by the first sensor 13 and second rotation information of the second detection gear disk 12 acquired by the second sensor 14.

[0068] The torsional vibration testing device 10 of this embodiment can test the overall torsional vibration performance of the power transmission system, and can also perform torsional tests on the transmission component under test simultaneously to obtain the torsional vibration performance of the transmission component under test.

[0069] For example, the transmission component to be tested is the flexible coupling 20 between the engine flywheel and the shaft flange of the power transmission system. A first testing gear 11 is configured to replace the engine flywheel of the power transmission system during testing. The connection structure of the first testing gear 11 includes an engine connection portion for connecting to the engine output shaft of the power transmission system and a first coupling connection portion for connecting to the first axial end of the flexible coupling 20. A second testing gear 12 is configured to replace the shaft flange of the power transmission system during testing. The connection structure of the second testing gear 12 includes a second coupling connection portion 123 for connecting to the second axial end of the flexible coupling 20 and a drive shaft connection portion 124 for connecting to the drive shaft 30 of the power transmission system.

[0070] The torsional vibration testing device 10 of this embodiment is suitable for testing the overall torsional vibration performance of a power transmission system including the elastic coupling 20, and can also test the torsional vibration performance of the elastic coupling 20 itself at the same time.

[0071] The sensors in the sensing device can be magnetoelectric sensors, such as Hall effect gear sensors, or photoelectric sensors. Magnetoelectric and photoelectric sensors can convert the acquired magnetic or electrical signals into electrical signals, which is beneficial for the control device 15 to calculate torsional vibration information.

[0072] like Figure 1 As shown, in some embodiments, the torsional vibration testing device 10 further includes a mounting bracket 16, which is configured to support the sensor. The mounting bracket 16 allows the sensor to be fixed in locations where installation is inconvenient, such as fixing the sensor to the vehicle frame, placing the sensor in a suitable working position and facilitating the acquisition of accurate rotational information of the corresponding detection gear.

[0073] like Figure 1 As shown, in some embodiments, the mounting position of the sensor supported by the mounting bracket 16 is adjustable. For example, the mounting position of the mounting bracket 16 is adjustable; and / or the mounting bracket 16 includes two or more mounting components, and the assembly position of at least two mounting components is adjustable; and / or the mounting position of the sensor on the mounting bracket 16 is adjustable. The purpose of all these settings is to ensure that the sensor is in the optimal working position, which facilitates the acquisition of more accurate rotation information of the corresponding detection gear.

[0074] Each sensor can be configured with a mounting bracket 16, or at least one sensor can be set on a corresponding fixed bracket, while the remaining sensors can be set on fixed components that are fixed relative to the power transmission system, such as the flywheel cover 40 of the engine in the power transmission system.

[0075] like Figure 1As shown, in some embodiments, the mounting bracket 16 comprises a mounting base 161, the mounting base 161 comprises a first long slot hole 1611 for fixing the mounting bracket 16, the first long slot hole 1611 is configured to cooperate with a bolt to fix the mounting base 161. In this arrangement, by changing the cooperation position between the bolt and the first long slot hole 1611, the mounting position of the mounting bracket 16 can be changed, thereby changing the position of the sensor on the mounting bracket 16.

[0076] As shown, in some embodiments, the mounting bracket 16 comprises two or more mounting components, the assembly position of at least two mounting components is adjustably arranged, the two or more mounting components comprise a mounting base 161 and a sensor mounting seat 162. The sensor mounting seat 162 comprises a sensor mounting portion, the sensor mounting seat 162 is adjustably mounted on the mounting base 161. As shown, the mounting bracket 16 comprises a screw rod 163 and a plurality of locking nuts 164. The screw rod 163 passes through the mounting base 161 and the sensor mounting seat 162, the length direction of the screw rod 163 is arranged at an angle with the extension direction of the first long slot hole 1611. The plurality of locking nuts 164 lock the screw rod 163 to the mounting base 161 and the sensor mounting seat 162. Figure 1 Figure 1 As shown, the mounting bracket 16 comprises a screw rod 163 and a plurality of locking nuts 164. The screw rod 163 passes through the mounting base 161 and the sensor mounting seat 162, the length direction of the screw rod 163 is arranged at an angle with the extension direction of the first long slot hole 1611. The plurality of locking nuts 164 lock the screw rod 163 to the mounting base 161 and the sensor mounting seat 162.

[0077] By locking the screw rod 163 to the mounting base 161 and the sensor mounting seat 162 with the nuts, the relative position between the mounting base 161 and the sensor mounting seat 162 can be adjusted, thereby the relative position of the sensor and the mounting base 161 can be adjusted to facilitate accurate positioning of the sensor.

[0078] The length direction of the screw rod 163 is arranged at an angle with the extension direction of the first long slot hole 1611, the sensor can be adjusted from two directions, which is more conducive to accurate positioning of the sensor to improve the accuracy of measurement. The screw rod 163 and the first long slot hole 1611 are preferably perpendicular to each other to facilitate quick adjustment of the mounting position of the sensor.

[0079] In some embodiments not shown, the mounting base has a second long slot hole; the sensor mounting seat has a third long slot hole arranged at an angle with the second long slot hole, the sensor mounting seat is connected by a threaded connector passing through the second long slot hole and the third long slot hole. When the mounting base and the sensor mounting seat are mounted, by changing the relative position of the threaded connector and the second long slot hole and the third long slot hole, the relative position of the mounting base and the sensor mounting seat can be adjusted, thereby the position of the sensor on the mounting bracket can be changed. The second long slot hole and the third long slot hole are preferably perpendicular to each other to facilitate quick adjustment of the mounting position of the sensor.

[0080] The following will be described in combination with Figure 1 and Figure 2 ​The torsional vibration testing device 10 for a power transmission system is further described in this embodiment of the present disclosure. Figure 1 In the test, the torsional vibration testing device 10 is installed in the power transmission system under test in such a way that the test gear plate replaces the corresponding transmission component of the power transmission system.

[0081] like Figure 1 As shown, the torsional vibration testing device 10 includes a gear plate device, a sensing device, a control device 15, and a mounting bracket 16.

[0082] The gear plate device includes two detection gear plates, namely a first detection gear plate 11 and a second detection gear plate 12. Each detection gear plate includes a wheel and a plurality of detection teeth integrally disposed on the outer periphery of the wheel and evenly arranged circumferentially along the wheel. Each detection gear plate is configured to be connected to the power transmission system during detection to replace the corresponding transmission component of the power transmission system.

[0083] The sensing device includes two sensors: a first sensor 13 and a second sensor 14. Both sensors are magnetoelectric sensors, specifically Hall effect gear sensors.

[0084] like Figure 1 In the embodiment shown, the flexible coupling 20 of the power transmission system, which is arranged between the engine flywheel and the shaft flange, is the transmission component to be tested, and the torsional vibration information of the control device 15 includes the torsional vibration information of the flexible coupling 20.

[0085] The first detection gear 11 includes a first disc 111 and a plurality of first detection teeth 112 integrally disposed on the outer periphery of the first disc 111 and evenly arranged circumferentially along the first disc 111. The first detection gear 11 is configured to replace the engine flywheel of the powertrain system during detection. The connection structure of the first detection gear 11 includes an engine connection portion for connection to the engine output shaft of the powertrain system and a first coupling connection portion for axial connection to the first end of the flexible coupling 20. The engine connection portion includes, for example, a connecting key; the first coupling connection portion includes, for example, a plurality of connecting holes. The connection structure and moment of inertia of the first detection gear 11 are the same as the corresponding connection structure and moment of inertia of the replaced engine flywheel.

[0086] The second detection gear disc 12 comprises a second wheel disc 121 and a plurality of second detection gears 122 integrally arranged on the outer periphery of the second wheel disc 121 and uniformly arranged along the circumferential direction of the second wheel disc 121. The second detection gear disc 12 is configured to detect the flange of the shaft joint of the power transmission system. The connecting structure of the second detection gear disc 12 comprises a second coupling connecting part 123 for connecting with the second axial end of the elastic coupling 20 and a transmission shaft connecting part 124 for connecting with the transmission shaft 30 of the power transmission system. The transmission shaft connecting part 124 comprises a hinged ear for example, and the second coupling connecting part 123 comprises a plurality of connecting holes for example. The connecting structure and the moment of inertia of the second detection gear disc 12 are the same as those of the flange of the shaft joint to be replaced.

[0087] The plurality of first detection gears 112 can be 127 involute gears with a module of 3.5 for example. The plurality of second detection gears 122 can be 60 involute gears with a module of 3.5 for example. The involute gears can be replaced by other tooth shapes such as rectangular teeth for example. The number of detection gears or the module can also be changed according to the test requirements.

[0088] The first sensor 13 of the sensing device is arranged correspondingly to the first detection gear disc 11. The first sensor 13 is configured to be used in cooperation with the first detection gear disc 11 to detect the first rotation information of the first detection gear disc 11. The first rotation information can represent the rotation information of the flywheel of the engine in the power transmission system. During detection, the first sensor 13 is fixedly installed on the flywheel cover 40 of the power transmission system.

[0089] The second sensor 14 is arranged correspondingly to the second detection gear disc 12. The second sensor 14 is configured to be used in cooperation with the second detection gear disc 12 to detect the second rotation information of the second detection gear disc 12. The second rotation information can represent the rotation information of the flange of the shaft joint in the power transmission system. During detection, the second sensor 14 is fixedly installed on the mounting bracket 16.

[0090] Figure 1 In the embodiment shown, the mounting position of the mounting bracket 16 is adjustably arranged. The mounting bracket 16 comprises a mounting base 161 and a sensor mounting seat 162. The mounting base 161 comprises a first long slot hole 1611 for fixedly mounting the mounting bracket 16, which is configured to cooperate with a bolt to fix the mounting base 161. The sensor mounting seat 162 comprises a sensor mounting part. The sensor mounting part is a mounting hole for mounting the sensor for example. When the outer periphery of the sensor comprises a mounting threaded segment, the mounting hole can be a threaded hole cooperating with the mounting threaded segment of the sensor.

[0091] The sensor mounting seat 162 is adjustably mounted on the mounting base 161. As shown in the figure, the sensor mounting seat 162 is adjustably mounted on the mounting base 161 by means of a plurality of mounting holes 1612 and a plurality of mounting holes 1621. Figure 1As shown, the mounting bracket 16 includes a screw rod 163 and a plurality of locking nuts 164. The length direction of the screw rod 163 is perpendicular to the extending direction of the first long hole 1611. The screw rod 163 passes through the mounting base 161 and the sensor mounting seat 162. The plurality of locking nuts 164 lock the screw rod 163 to the mounting base 161 and the sensor mounting seat 162.

[0092] The control device 15 is in signal connection with the sensing device, configured to receive the first rotation information and the second rotation information and calculate and output the torsional vibration information of the power transmission system according to the first rotation information and the second rotation information. The torsional vibration information includes the torsional vibration information of the power transmission system and the torsional vibration information of the elastic coupling 20 itself.

[0093] The control device 15 may, for example, be a torsional vibration test data acquisition instrument or other existing torsional vibration measuring device. As shown in FIG. 2, the control device 15 may, for example, include a preamplifier circuit 151, a monostable circuit 152, a low-pass filter circuit 153, a capacitor 154, an integral amplifier circuit 155, and a recorder 156 arranged in sequence. Figure 2

[0094] In embodiments not shown, the aforementioned control device 15 may also be implemented as a general-purpose processor, a programmable logic controller (PLC), a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic device, a discrete gate or transistor logic device, a discrete hardware component, or any appropriate combination thereof, for performing the functions described in the present disclosure.

[0095] When the torsional vibration test device 10 of the embodiments of the present disclosure is assembled with the relevant transmission components of the power transmission system, the flanges at both ends of the elastic coupling 20 are respectively bolted to the first detection flange 11 that replaces the engine flywheel and the second detection flange 12 that replaces the axle flange.

[0096] ​The first detection gear 11 is connected to the engine output shaft (not shown) via its engine connection portion, and the second detection gear 12 is connected to the drive shaft 30 via its drive shaft connection portion 124. The first sensor 13 is mounted on the flywheel cover 40. The detection ends of the first sensor 13 are spaced apart and aligned with the outer periphery of the first detection gear 11, ensuring perpendicularity. Multiple first detection teeth 112 serve as signal encoders for the first sensor 13. The distance between the detection ends of the first sensor 13 and the tip circles of the multiple first detection teeth 112 is, for example, approximately 1 mm.

[0097] The second sensor 14 is mounted and fixed to the sensor mounting part of the mounting bracket 16. The test position of the second sensor 14 can be adjusted and fixed by adjusting the relative position of the bolts connecting the mounting bracket 16 and the first elongated hole 1611 of the mounting base 161, and by adjusting the locking positions of the mounting base 161, sensor mounting seat 162, and screw 163 of the mounting bracket 16. The detection end of the second sensor 14 is spaced directly opposite the outer periphery of the second detection gear 12, ensuring perpendicularity. The multiple second detection teeth 122 of the second detection gear 12 serve as the signal encoder of the second sensor 14. The distance between the detection end of the second sensor 14 and the tooth tip circle of the multiple second detection teeth 122 is, for example, approximately 1 mm.

[0098] After connecting the signal lines of each sensor to the control device 15, the test can begin.

[0099] The first sensor 13 and the second sensor 14 form a test pair to measure the relative torsional vibration at both ends of the flexible coupling 20, providing support for the study of the torsional vibration characteristics of the flexible coupling 20 and monitoring the torsional vibration of the whole vehicle.

[0100] The principle of torsional vibration is as follows:

[0101] Theoretically, the average angular velocity of the detection gear disk (such as the first detection gear disk 111 or the second detection gear disk 121) that replaces the corresponding rotating component in the power transmission system While the instantaneous angular velocity ωi remains constant, it fluctuates, allowing the detection of any point on the gear disk within a minute time t. i Internal wave displacement θ i The magnitude of this value is the amplitude of the torsional vibration of the power transmission system, measured in deg.

[0102] When the sensor corresponding to the detection gear disk (such as the first sensor 13 or the second sensor 14) collects N pulses per revolution, due to the fluctuation of the instantaneous rotational speed, N pulse signals with different periods are output every 360° of revolution. The timing t for each pulse signal is recorded. i The average angular velocity can be obtained.

[0103]

[0104] The angular velocity obtained for each pulse interval can be regarded as the instantaneous angular velocity ω i :

[0105] ω i = (360° / N) / t i (deg / s).

[0106] The difference between the instantaneous angular velocity ω i and the average angular velocity can be regarded as the angular velocity fluctuation Δω i :

[0107]

[0108] The torsional vibration amplitude (i.e., the torsional vibration angle) θ i :

[0109] θ i = Δω i × t i (deg).

[0110] These torsional vibration angles can represent the torsional vibration information of the power transmission system.

[0111] When the torsional vibration of the power transmission system is measured by using the double sensors, the torsional vibration information of the detected transmission component, such as the elastic coupling, between the double sensors can be determined by calculating the angular velocity difference of the double sensors, so as to determine whether the torsional vibration performance of the elastic coupling meets the requirements.

[0112] Taking the power transmission system of an engineering vehicle as an example, after the components of the torsional vibration testing device 10 are installed in place, the torsional vibration test is started. During the test, first, the engine is started, and the rotating part of the power transmission system is rotated at a low speed, and the signals of the sensors are checked to see whether they are normal. Then, the transmission is adjusted to the test gear, the engine is increased from idle speed to the highest speed, and the no-load working condition test is performed, each test point is stabilized for a period of time, for example, about 1 minute. Then, the working performance and driving performance test is performed.

[0113] In addition, the torsional vibration testing device 10 of the embodiment of the present disclosure can be used to install different types of elastic couplings 20 in the power transmission system and perform torsional vibration tests, and according to the test results and the design requirements of the power transmission system, the elastic couplings 20 can be selected.

[0114] According to the above description, the torsional vibration testing device has at least one of the following advantages: rapid and effective processing and assembly, improved testing efficiency; the test can be completed without affecting the dynamic balance of the power transmission system; the torsional vibration can be accurately measured; the sensor installation position can be adjusted; it can be used for matching and verification of the elastic coupling and the power transmission system, and for selection of the elastic coupling.

[0115] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present disclosure, but not to limit them; although the present disclosure has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the specific embodiments of the present disclosure can be modified or some technical features can be replaced by equivalent ones, which should be covered in the technical solution range of the present disclosure.

Claims

1. A torsional vibration testing apparatus for a power transmission system, characterized by, Comprising: A gear disc device, comprising two detection gear discs, the detection gear discs comprising a wheel disc and a plurality of detection teeth integrally arranged on the wheel disc periphery along the circumferential direction of the wheel disc, the detection gear discs being configured to be connected to the power transmission system to replace corresponding transmission components of the power transmission system, the wheel disc comprising a connecting structure, the connecting structure of the wheel disc being configured to connect transmission components of the power transmission system connected to the corresponding transmission components to be replaced, the two detection gear discs comprising a first detection gear disc (11) and a second detection gear disc (12) for replacing two transmission components at the axial ends of the transmission components to be detected of the power transmission system, the first detection gear disc (11) and the second detection gear disc (12) being configured to be connected to the axial ends of the transmission components to be detected of the power transmission system respectively when detection is performed; And A sensing device, comprising two sensors corresponding to the two detection gear discs, the sensors being configured to be used in cooperation with the corresponding detection gear discs to obtain rotation information of the corresponding detection gear discs, the two sensors comprising a first sensor (13) corresponding to the first detection gear disc (11) and a second sensor (14) corresponding to the second detection gear disc (12), the rotation information comprising first rotation information of the first detection gear disc (11) obtained by the first sensor (13) and second rotation information of the second detection gear disc (12) obtained by the second sensor (14); A control device (15) in signal connection with the sensing device, configured to receive the rotation information and calculate and output torsional vibration information of the power transmission system according to the rotation information.

2. The torsional vibration test device of the power transmission system according to claim 1, wherein The transmission components to be detected are elastic shaft couplings (20) between an engine flywheel and a shaft joint flange of the power transmission system, The first detection gear disc (11) is configured to replace the engine flywheel when detection is performed, the connecting structure of the first detection gear disc (11) comprising an engine connecting portion for connecting with an engine output shaft of the power transmission system and a first shaft coupling connecting portion for connecting with an axial first end of the elastic shaft coupling (20); The second detection gear disc (12) is configured to replace the shaft joint flange when detection is performed, the connecting structure of the second detection gear disc (12) comprising a second shaft coupling connecting portion (123) for connecting with an axial second end of the elastic shaft coupling (20) and a transmission shaft connecting portion (124) for connecting with a transmission shaft (30) of the power transmission system.

3. The torsional vibration testing apparatus of claim 1, wherein The sensors are magneto-electric sensors or photoelectric sensors.

4. The torsional vibration testing apparatus of claim 1, wherein Further comprising a mounting bracket (16) configured to support the sensors.

5. The torsional vibration testing apparatus of claim 4, wherein, The mounting position of the sensors supported by the mounting bracket (16) is adjustably arranged.

6. The torsional vibration test device of the power transmission system according to claim 5, wherein The mounting position of the mounting bracket (16) is adjustably arranged; and / or The mounting bracket (16) comprises two or more mounting assemblies, and the assembly positions of at least two of the mounting assemblies are adjustably arranged; and / or The mounting position of the sensor on the mounting bracket (16) is adjustably arranged.

7. The torsional vibration testing apparatus of claim 6, wherein, The mounting bracket (16) comprises a mounting base (161), and the mounting base (161) comprises a first long slot (1611) for fixing the mounting bracket (16), and the first long slot (1611) is configured to cooperate with a bolt to fix the mounting base (161).

8. The torsional vibration testing apparatus of claim 6, wherein, The mounting bracket (16) comprises two or more mounting assemblies, and the assembly positions of at least two of the mounting assemblies are adjustably arranged, and the at least two mounting assemblies comprise: a mounting base (161); a sensor mounting seat (162) comprising a sensor mounting portion, and the sensor mounting seat (162) is adjustably arranged on the mounting base (161).

9. The torsional vibration testing apparatus of claim 8, wherein, The mounting bracket (16) comprises: a screw rod (163) passing through the mounting base (161) and the sensor mounting seat (162), and the length direction of the screw rod (163) is arranged at an angle with the extension direction of the first long slot (1611) of the mounting base (161); and a plurality of locking nuts (164) for locking the screw rod (163) to the mounting base (161) and the sensor mounting seat (162).

10. The torsional vibration testing device of the power transmission system according to claim 8, wherein the mounting base (161) has a second long slot; the sensor mounting seat (162) has a third long slot arranged at an angle with the second long slot, and the sensor mounting seat (162) is connected by a threaded connecting piece passing through the second long slot and the third long slot.

11. The torsional vibration testing apparatus of a power transmission system according to any one of claims 1 to 10, characterized by, The detection gear disc is configured to have the same rotational inertia as the corresponding transmission component replaced in the power transmission system.

12. The torsional vibration testing apparatus of a power transmission system according to any one of claims 1 to 10, characterized by, The connecting structure of the wheel disc is configured to be the same as the connecting structure of the corresponding transmission component replaced in the power transmission system for connecting the connected transmission component.

Images