CN112834019A - Vehicle driving shaft sheath abnormal sound testing device and testing method - Google Patents
Vehicle driving shaft sheath abnormal sound testing device and testing method Download PDFInfo
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- CN112834019A CN112834019A CN202011575336.2A CN202011575336A CN112834019A CN 112834019 A CN112834019 A CN 112834019A CN 202011575336 A CN202011575336 A CN 202011575336A CN 112834019 A CN112834019 A CN 112834019A
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- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H17/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves, not provided for in the preceding groups
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- G—PHYSICS
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
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Abstract
The application relates to the technical field of vehicles, in particular to a device and a method for testing abnormal sound of a vehicle driving shaft sheath. This vehicle drive shaft sheath abnormal sound testing arrangement is used for carrying out the abnormal sound test to the test piece, and this test piece includes first universal joint, second universal joint, drive shaft axostylus axostyle and sheath, and the device includes: the test device comprises a headstock, a tailstock and a motor, wherein the headstock is suitable for being in splined connection with a first universal joint of a test piece, the tailstock is suitable for being in splined connection with a second universal joint of the test piece, and the motor is suitable for driving the test piece to rotate axially. The vehicle driving shaft sheath abnormal sound testing device and the testing method can simulate the assembly state and the motion state of a driving shaft sheath in a whole vehicle, detect whether abnormal sound occurs to the sheath in the driving shaft motion process, realize abnormal sound testing and optimization of the driving shaft sheath before the whole vehicle is off-line, and are beneficial to shortening the development period of the driving shaft sheath.
Description
Technical Field
The invention relates to the technical field of vehicles, in particular to a device and a method for testing abnormal sound of a vehicle driving shaft sheath.
Background
In the driving process of the vehicle, gear shifting impact, sudden acceleration, sudden deceleration or the occurrence of severe working conditions such as concave-convex roads enables each drive axle suspension to jump up and down and steer, so that wave crests of a sheath of a drive shaft rub against each other, and abnormal sound is generated sometimes.
In the prior art, after the overall development of the vehicle is completed, the sheath structure or raw materials can be optimized according to actual conditions when the abnormal sound occurs in the sheath of the driving shaft in the road test process of the overall vehicle. However, the abnormal sound of the drive shaft sheath is generally obvious after the vehicle runs for a period of time, so that the development period of the drive shaft sheath is long at present, and the optimization of the sheath structure, raw materials and the like in a short time is difficult to realize. Meanwhile, at present, no equipment capable of accurately testing the influence factors of the abnormal sound of the sheath exists, the sheath can be optimized only according to the experience of research and development personnel, and the precise optimization of the sheath is difficult to realize.
Therefore, it is important to provide a device and a method for testing abnormal noise of a driving shaft sheath in a vehicle design stage.
Disclosure of Invention
In view of the above, the invention provides a device and a method for testing abnormal sound of a vehicle driving shaft sheath, so as to test the abnormal sound condition of the driving shaft sheath in a vehicle design stage. The technical scheme is as follows:
in a first aspect, the embodiment of the present application provides a vehicle drive shaft sheath abnormal sound testing device, the device is used for performing an abnormal sound test on a test piece, the test piece includes a first universal joint, a second universal joint, a drive shaft rod and a sheath, the sheath includes a large-diameter fixing portion, a small-diameter fixing portion and an intermediate portion, the first universal joint is connected to a first side of the drive shaft rod, the sheath is sleeved on a second side of the drive shaft rod, the second side of the drive shaft rod is further connected with the second universal joint, the large-diameter fixing portion of the sheath is fixedly connected with the second universal joint, the small-diameter fixing portion of the sheath is fixedly connected with the drive shaft rod, the device includes a headstock, a tailstock and a motor,
the headstock is suitable for being connected with the first universal joint through a spline, the tailstock is suitable for being connected with the second universal joint through a spline, and the motor is suitable for driving the test piece to rotate axially.
Optionally, the device further includes a carriage structure, the carriage structure is adapted to control a tilt angle of the second gimbal, the carriage structure includes a first sub carriage structure acting in a first direction and a second sub carriage structure acting in a second direction, and the first direction is perpendicular to the second direction.
Optionally, the device further comprises a muddy water spraying structure, and the muddy water spraying structure is suitable for spraying muddy water to the protective sleeve.
Optionally, the device further includes an angle sensor and a rotation speed sensor, the angle sensor is used for detecting the swing angles of the second universal joint and the sheath, and the rotation speed sensor is used for detecting the rotation speed of the test piece.
Optionally, the apparatus further comprises a computer controller for storing data measured by the angle sensor and the rotation speed sensor.
In a second aspect, an embodiment of the present invention provides a vehicle driveshaft sheath abnormal sound testing method, which is used for a vehicle driveshaft sheath abnormal sound testing device, where the device is used to perform an abnormal sound test on a test piece, the test piece includes a first universal joint, a second universal joint, a driveshaft shaft, and a sheath, the sheath includes a major diameter fixing portion, a minor diameter fixing portion, and a middle section, the first universal joint is connected to a first side of the driveshaft shaft, the sheath is sleeved on a second side of the driveshaft shaft, the second side of the driveshaft shaft is also connected to the second universal joint, the major diameter fixing portion of the sheath is fixedly connected to the second universal joint, the minor diameter fixing portion of the sheath is fixedly connected to the driveshaft shaft, the device includes a headstock, a tailstock, and a motor, where the headstock is adapted to be connected to the first universal joint through a spline, the tailstock is suitable for being connected with the second universal joint through a spline,
the method comprises the following steps:
driving the test piece to axially rotate at a first rotation speed by a first rotation number by using the motor;
and judging whether abnormal sound exists or not during the axial rotation of the test piece.
Optionally, the apparatus further comprises a carriage structure, the carriage structure comprises a first sub carriage structure acting in a first direction and a second sub carriage structure acting in a second direction, the first direction and the second direction are perpendicular to each other,
the method further comprises the following steps:
the second universal joint is controlled to swing in the radial direction within a preset angle range through the planker structure while the motor is used for driving the test piece to axially rotate at a first rotation speed by a first rotation speed;
and judging whether abnormal sound exists or not during the axial rotation of the test piece.
Optionally, the device also comprises a muddy water spraying structure,
the method further comprises the following steps: repeatedly and sequentially executing mileage accumulation and abnormal sound detection for preset times;
wherein the mileage accumulation includes: the motor is used for driving the test piece to axially rotate at a second rotating speed for a second number of revolutions, the second universal joint is controlled to radially swing within a preset angle range through the planker structure during the second number of revolutions, and muddy water is sprayed to the sheath through the muddy water spraying structure;
the abnormal sound detection comprises the following steps: and driving the test piece to axially rotate at a third rotation speed by using the motor for a third number of revolutions, controlling the test piece to radially swing within a preset angle range by using the planker structure during the third rotation speed, and simultaneously judging whether the sheath makes abnormal sound.
Optionally, the device further comprises an angle sensor and a rotation speed sensor,
the method further comprises the following steps:
and during the axial rotation of the test piece, detecting the swing angles of the second universal joint and the sheath by using the angle sensor, and detecting the rotating speed of the test piece by using the rotating speed sensor.
Optionally, the apparatus further comprises a computer controller,
the method further comprises the following steps:
and storing the data measured by the angle sensor and the rotating speed sensor in a computer controller.
The technical scheme provided by the embodiment of the invention has the following beneficial effects:
the device for testing the abnormal sound of the vehicle driving shaft sheath comprises a headstock, a tailstock and a motor, wherein the headstock and the tailstock are respectively suitable for being connected with universal joints at two ends of a test piece through splines. The motor drives the test piece to rotate axially, so that the assembly state and the running state of the driving shaft in the vehicle can be simulated. The technical staff judges whether abnormal sound appears during test piece axial rotation, can realize just can appearing the abnormal sound to the drive shaft sheath before the vehicle actually rolls off the production line and test, and then the technical staff can optimize the improvement to the sheath according to actual conditions, very big shortening the cycle of sheath optimal design.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a vehicle drive shaft sheath abnormal sound testing device according to an embodiment of the present invention;
FIG. 2 is a schematic logic diagram of a method for testing abnormal noise of a vehicle drive shaft sheath according to an embodiment of the present invention;
FIG. 3 is a flow chart of a method for testing abnormal noise of a vehicle drive shaft sheath according to an embodiment of the present invention;
FIG. 4 is a flow chart of another method for testing abnormal noise of a vehicle drive shaft sheath according to an embodiment of the present invention;
fig. 5 is a flowchart of another method for testing abnormal noise of a vehicle drive shaft sheath according to an embodiment of the present invention.
In fig. 1, the list of components represented by the various reference numbers is as follows:
the device comprises a head frame 1, a test piece 2, a drive shaft 2a, a first universal joint 2b, a drive shaft rod 2c, a sheath 2d, a second universal joint 3, an auxiliary supporting structure 4, a muddy water spraying structure 5, an angle sensor 6, a rotating speed sensor 7, a tail frame 8, a motor 9, a computer controller 10, a first sub-carriage structure 11 and a second sub-carriage structure.
Detailed Description
To make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.
In the description of the present invention, it is to be understood that the terms "inner", "upper", "both ends", "outer top", "side", "middle position", "inner bottom", etc. indicate orientations or positional relationships only for the convenience of describing the present invention and simplifying the description, but do not indicate or imply that the referenced components or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
In order to make the technical solution provided by the embodiment of the present invention easy to understand, an application scenario related to the embodiment of the present invention will be briefly described below.
The vehicle drive shaft, also called a half shaft, is a shaft connecting a differential with a drive wheel, and has a universal joint at each end, and the universal joints at both ends are connected with a half shaft gear of the differential and a hub of the drive wheel through splines, respectively. The primary function of the drive shaft is to transmit power between the differential and the drive wheels.
The driving shaft sheath is an important part on the driving shaft, is filled with lubricating grease, and mainly has the functions of providing a sealed environment for the universal joint at the end part of the driving shaft, preventing foreign matter from invading and storing lubricating grease. Meanwhile, the drive shaft sheath needs to be matched with the rotation of the universal joint, so that enough deformation capacity needs to be provided.
Since the drive shaft sheath generally presents the abnormal noise problem after the vehicle travels a certain distance, and a testing device for detecting the abnormal noise of the drive shaft sheath does not exist at present, the time required for improving and optimizing the drive shaft sheath is longer. Therefore, the embodiment of the invention provides a testing device and a testing method for testing the abnormal sound condition of the driving shaft sheath before the vehicle is off-line.
The following describes a device and a method for testing abnormal noise of a vehicle drive shaft sheath provided by the invention with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a vehicle drive shaft sheath abnormal sound testing device according to an embodiment of the present invention. As shown in fig. 1, the vehicle driving shaft sheath abnormal sound testing device comprises a head frame 1, a tail frame 7 and a motor 8. The test device is used for carrying out abnormal sound test on the test piece 2.
The test piece 2 includes a first universal joint 2a, a second universal joint 2d, a driveshaft shaft 2b, and a sheath 2c, and the sheath 2c includes a large-diameter fixing portion, a small-diameter fixing portion, and an intermediate portion. Wherein, first universal joint 2a is connected in the first side of driveshaft axostylus axostyle 2b, and the sheath 2c suit is in driveshaft axostylus axostyle 2 b's second side, and driveshaft axostylus axostyle 2 b's second side still is connected with second universal joint 2d, and the major diameter fixed part and the second universal joint 2d fixed connection of sheath 2c, minor diameter fixed part and driveshaft axostylus axostyle 2b fixed connection.
Optionally, the middle section of the sheath 2c includes a plurality of wave crests and wave troughs, the large-diameter fixing portion of the sheath 2c is fixedly connected with the second universal joint 2d through any one of the manners such as clamping, spinning or threaded connection, and the small-diameter fixing portion is fixedly connected with the driving shaft rod 2b through any one of the manners such as clamping, spinning or threaded connection.
In the embodiment of the invention, the elements contained in the test piece and the connection relation among the elements are similar to those of the actual vehicle assembly, so that the mounting state of the drive shaft sheath can be matched with the actual situation, and the correctness of the test result is ensured.
With continued reference to FIG. 1, the headstock 1 is adapted to be splined to the first gimbal 2a of the test piece 2, the tailstock 7 is adapted to be splined to the second gimbal 2d of the test piece 2, and the motor 8 is adapted to drive the test piece 2 in axial rotation.
In specific implementation, the headstock 1 and the tailstock 7 are respectively connected with the first universal joint 2a and the second universal joint 2d of the test piece 2 through splines, so that the axial rotation of the test piece 2 is not limited while the two ends of the test piece 2 are fixed. Further, utilize motor 8 drive test piece 2 to carry out axial rotation to can simulate the axial rotation of vehicle operation in-process drive shaft, through the abnormal sound condition during judging 2 axial rotations of test piece, can realize knowing before the vehicle is offline whether the abnormal sound can appear in normal work drive shaft sheath.
In summary, the abnormal sound testing device for the vehicle driving shaft sheath provided by the embodiment of the invention can simulate the rotating state of the driving shaft in the vehicle running process. Whether the sheath sends abnormal sound is detected or judged during axial rotation of the test piece, basic understanding can be provided for the performance of the drive shaft sheath in the research and development design stage of the vehicle, continuous optimization of the drive shaft sheath is further promoted, and the research and development design period of the drive shaft sheath is shortened.
Optionally, the device for testing the abnormal sound of the vehicle driving shaft sheath provided by the embodiment of the invention further comprises a carriage structure, and the carriage structure is suitable for controlling the swing angle of the second universal joint. Referring to fig. 1, the carriage structure includes a first sub carriage structure 10 acting in a first direction and a second sub carriage structure 11 acting in a second direction, wherein the first direction and the second direction are perpendicular to each other.
Because the vehicle operation in-process, different operating modes can often appear, like unsmooth road, sharp acceleration, sharp deceleration and sharp turn etc. lead to the change of the different degree can appear in the angle between vehicle drive shaft and the wheel, and then make the drive shaft sheath take place the deformation of different degrees. When the vehicle turns, the angle between the driving shaft and the wheel on the horizontal plane is generally changed greatly, and when the vehicle runs on an uneven road surface, the angle between the driving shaft and the wheel on the plane vertical to the ground is generally changed greatly.
In the embodiment of the invention, the drag plate structure is arranged to change the swing angle of the second universal joint of the test piece, and the second universal joint pulls the sheath to deform, so that the deformation of the sheath caused by the change of the angle between the driving shaft and the wheel in the actual operation of the vehicle is simulated. Further, the planker structure is including acting on the first sub planker structure of first direction and the second sub planker structure that acts on the second direction, this first sub planker structure can drive the second universal joint and take place the swing on this first direction, this second sub planker structure can drive the second universal joint and take place the swing on this second direction, first direction and second direction are mutually perpendicular, thereby can make the second universal joint take place the swing of different angle values on the different directions, can simulate the deformation of drive shaft sheath under different operating modes comprehensively, make the degree of accuracy that the drive shaft sheath abnormal sound detected higher.
Optionally, with continued reference to fig. 1, the vehicle drive shaft sheath abnormal noise testing apparatus may further include a muddy water spraying structure 4, the muddy water spraying structure 4 being adapted to spray muddy water to the sheath 2c of the test piece 2.
In actual operation of a vehicle, a rainy and snowy weather is often encountered, and when the vehicle runs in the rainy and snowy weather, the driving shaft sheath is splashed with muddy water, so that abnormal noise of the sheath can be caused. In the embodiment of the invention, the vehicle driving shaft abnormal sound testing device further comprises a muddy water spraying structure, the muddy water spraying structure can spray muddy water to the jacket of the test piece, the state of the driving shaft jacket in rainy and snowy weather is simulated, and the abnormal sound condition of the driving shaft jacket can be detected more comprehensively and accurately.
Optionally, the nominal size of the particles of the muddy water sprayed by the muddy water spraying structure is 0-80 μm, the size range can ensure that the muddy water can be attached to the surface of the sheath after the muddy water is sprayed on the sheath, and meanwhile, the surface friction coefficient of the sheath is not changed, so that the state of the sheath in the actual operation of the vehicle can be more accurately simulated, and the subsequent abnormal sound detection is more practical. The mixing ratio of the muddy water is shown in table 1, for example.
TABLE 1 mud-water ratio
Optionally, with continued reference to fig. 1, the vehicle drive shaft sheath abnormal sound testing apparatus may further include an angle sensor 5 and a rotation speed sensor 6, where the angle sensor 5 is configured to detect a swing angle of the second universal joint 2d and the sheath 2c, and the rotation speed sensor 6 is configured to detect a rotation speed of the test piece 2.
Optionally, with continued reference to fig. 1, the vehicle driveshaft jacket abnormal sound testing apparatus may further include a computer controller 9, wherein the computer controller 9 is configured to store data measured by the angle sensor 5 and the rotation speed sensor 6.
The device for testing the abnormal sound of the vehicle driving shaft sheath provided by the embodiment of the invention is also provided with the angle sensor, the rotating speed sensor and the computer controller, wherein the angle sensor is used for detecting the swing angle of the sheath, the rotating speed sensor is used for detecting the rotating speed of the test piece, and the data measured by the angle sensor and the rotating speed sensor are stored in the computer controller, so that technical developers can conveniently analyze the test data of the test piece in the subsequent process, for example, the device can analyze that the sheath does not generate the abnormal sound when the swing angle of the second universal joint is within a certain range, or the sheath does not generate the abnormal sound when the rotating speed of the test piece is within a certain range, and.
It should be noted that the embodiment of the present invention does not limit the specific implementation manner of detecting or determining whether the abnormal noise occurs in the sheath. Because the sound intensity is generally higher when the drive shaft sheath makes abnormal sound, a technician can directly determine whether the sheath makes abnormal sound in the axial rotating device of the test piece in a listening mode.
In some embodiments, an acoustic intensity sensor can also be arranged in the vehicle driving shaft sheath abnormal sound testing device, the acoustic intensity sensor is used for recording the sound intensity during the axial rotation of the test piece, and the measured data is stored in the computer controller. In this case, the technician can directly know the abnormal sound condition of the drive shaft sheath by analyzing the sound intensity signal, the swing angle signals of the second universal joint and the sheath and the rotating speed signal of the test piece.
Optionally, as shown in fig. 1, in order to guarantee the overall stability of the test piece 2 during axial rotation, an auxiliary support structure 3 may also be provided in the region of the shaft 2b between the first universal joint 2a and the jacket 2c of the test piece 2.
In summary, the abnormal sound testing device for the vehicle driving shaft sheath provided in the embodiment of the invention can simulate the deformation condition of the sheath of the vehicle under a stable working condition, in a rainy and snowy weather and under various working conditions such as a sharp turn and a rough road surface, and further can detect whether the abnormal sound exists in the sheath under various different working conditions, can be used for analyzing the influence factors of the abnormal sound of the driving shaft sheath, realizes the detection of the abnormal sound condition of the driving shaft sheath at the vehicle design stage, is convenient for technical personnel to accurately optimize the structure or material of the sheath, and shortens the development cycle of the driving shaft sheath.
Fig. 2 is a schematic general logic diagram of a method for testing abnormal noise of a vehicle drive shaft sheath according to an embodiment of the present invention. The method for testing the abnormal sound of the vehicle driving shaft sheath is used for the device for testing the abnormal sound of the vehicle driving shaft sheath provided by the embodiment.
As shown in fig. 2, the method for testing abnormal noise of the vehicle drive shaft sheath according to the embodiment of the present invention can be generally divided into two stages. The stage 1 is initial abnormal sound verification, and can correspond to initial abnormal sound detection of a driving shaft sheath when a whole vehicle is off-line after vehicle development in the current industry is finished. And a stage 2 is abnormal sound verification for simulating a 3-kilometre comprehensive road test of the whole vehicle, and is corresponding to abnormal sound detection of a driving shaft sheath after the 3-kilometre comprehensive road test of the vehicle in the current industry.
After the vehicle is subjected to a comprehensive road test of 3 kilometres, the abnormal sound problem of each element of the vehicle is generally obvious, so that the embodiment of the invention can carry out a targeted abnormal sound test on the driving shaft sheath, further helps research personnel to quickly detect the abnormal sound problem of the sheath, and shortens the research and development period of the sheath.
It should be noted that, the embodiment of the present invention discloses only an example of the general logic of a test method, and those skilled in the art may set the stage division of the test method according to actual requirements, for example, the stage 2 may be abnormal sound verification for simulating a 10 kilometer comprehensive road test of the entire vehicle.
Fig. 3 shows a flowchart of a method for testing abnormal noise of a vehicle drive shaft sheath according to an embodiment of the invention.
Referring to fig. 3, the method for testing the abnormal noise of the vehicle drive shaft sheath comprises the following steps:
and 101, driving the test piece to axially rotate at a first rotation speed by a first rotation speed through a motor.
In the implementation, the technical staff can set up the rotational speed and the revolution of test piece according to actual demand to adapt to different motorcycle types and operating mode. Optionally, the first rotating speed and the first rotating number may be obtained by converting parameters such as vehicle speed and engine rotating speed when abnormal sound occurs in the vehicle drive shaft sheath in actual measurement, or may be empirical values obtained by technicians according to experience, so that accuracy of detecting the abnormal sound of the vehicle drive shaft sheath is ensured to the greatest extent.
Alternatively, the first rotation speed may be 30rpm (reduced Per Minute, rpm is used for short), and the first rotation number may be 286 rpm.
And 102, judging whether abnormal sound exists or not during the axial rotation of the test piece.
Optionally, whether the sheath emits abnormal sound or not can be judged in a mode that a tester directly listens, the sound intensity around the sheath in the test process can be recorded by arranging a sound intensity sensor in the vehicle driving shaft sheath abnormal sound testing device, and the abnormal sound is considered to exist when the sound intensity is larger than a preset threshold value.
In summary, the vehicle drive shaft sheath testing method provided by the embodiment of the invention can simulate the motion state of the sheath when the vehicle drive shaft rotates in the axial direction, and can evaluate the abnormal sound condition of the sheath before the vehicle goes off the line by detecting the abnormal sound condition of the test piece during the axial rotation, so as to accelerate the development speed of the drive shaft sheath.
Fig. 4 shows a flowchart of another method for testing abnormal noise of a vehicle drive shaft sheath according to an embodiment of the invention.
Referring to fig. 4, the method for testing the abnormal noise of the vehicle drive shaft sheath comprises the following steps:
and step 111, controlling a second universal joint of the test piece to swing in the radial direction within a preset angle range through a planker structure while driving the test piece to axially rotate at a first rotation speed by using a motor at the first rotation speed.
In an implementation, the carriage structure comprises a first sub-carriage structure acting in a first direction and a second sub-carriage structure acting in a second direction, the first direction and the second direction being perpendicular to each other. Therefore, the dragging plate structure can control the second universal joint of the test piece to swing in multiple directions, further the traction sheath deforms in multiple directions to different degrees, the actual working condition of the vehicle is simulated more accurately, and abnormal sound detection of the vehicle driving shaft sheath is more accurate.
It should be noted that, in step 111, controlling the test piece to swing in the radial direction within the preset angle range means that the swing angle ranges of the test piece in the first direction and the second direction are both the preset angle ranges.
Optionally, the preset angle range may be 0 ° to 45 °, and the carriage structure may control the second gimbal to swing at a random angle within the preset angle range in the first direction and the second direction, respectively, so as to simulate that the vehicle encounters different working conditions.
Optionally, the carriage structure may also control the swing angle of the second universal joint of the test piece to change within the preset angle range according to a certain rule, so as to analyze the influence manner of the swing angle of the second universal joint on the abnormal sound of the sheath.
And 112, judging whether abnormal sound exists during the axial rotation of the test piece.
Optionally, whether the sheath emits abnormal sound or not can be judged in a mode that a tester directly listens, and the sound intensity around the sheath in the test process can be recorded by arranging a sound intensity sensor in the vehicle driving shaft sheath abnormal sound testing device.
In summary, the method for testing the abnormal sound of the vehicle driving shaft sheath provided by the embodiment of the invention can simulate the motion state and deformation condition of the driving shaft sheath under various working conditions such as concave-convex roads and turning, on the basis, whether the abnormal sound exists or not is judged during the axial rotation of the test piece, and the abnormal sound condition of the driving shaft sheath can be more comprehensively evaluated.
It should be noted that the embodiment of the method for testing abnormal noise of the vehicle driving shaft sheath shown in fig. 3 and 4 can be executed in stage 1, and is used for simulating the preliminary abnormal noise detection of the driving shaft sheath when the vehicle is integrally off line.
Fig. 5 shows a flowchart of another method for testing abnormal noise of a vehicle drive shaft sheath according to an embodiment of the invention.
Referring to fig. 5, the method for testing the abnormal noise of the vehicle drive shaft sheath comprises the following steps:
step 201 and step 202 of repeatedly and sequentially executing preset times;
the preset times are N, N is an integer greater than or equal to 1, the step 201 is mileage accumulation, the step 202 is abnormal sound detection, and the current execution times are N.
In specific implementation, a technician may set the second rotation speed, the second rotation number, and the preset number N according to an actual vehicle type and an application scenario.
Alternatively, the second rotation speed may be 1000rpm, the second rotation speed may be 5730 revolutions, and the preset number N may be 4.
Optionally, the preset angle range is 0 ° to 45 °, and the radial swing of the test piece within the preset angle range by the planker structure means that the test piece is radially swung at random angles within the preset angle range in the first direction and the second direction, respectively.
In the implementation, during the test piece is rotatory, the planker structure control test piece is at the radial swing in presetting the angle scope to spray muddy water to the sheath of test piece through muddy water spraying structure, and then can simulate the deformation of vehicle actual operation and meet with the drive shaft sheath behind the various complicated operating modes.
In the implementation, the technician can set the third rotating speed and the third rotating speed of the test piece according to the actual requirement so as to adapt to different vehicle types and working conditions. Optionally, the third rotating speed and the third number of revolutions may be obtained by converting parameters such as a vehicle speed and an engine rotating speed when the abnormal sound of the vehicle driving shaft sheath is actually measured, or may be obtained by a technician according to experience, so as to ensure the accuracy of detecting the abnormal sound of the vehicle driving shaft sheath to the maximum extent.
Alternatively, the third rotation speed is 30rpm and the third rotation speed is 286 rpm.
Optionally, the preset angle range is 0 ° to 45 °, and the radial swing of the test piece within the preset angle range by the planker structure means that the test piece is radially swung at random angles within the preset angle range in the first direction and the second direction, respectively.
Optionally, the following two ways of judging whether the sheath makes abnormal sound are available: one method is to judge whether the sheath makes abnormal sound by the way that the tester listens directly; the other is that the sound intensity around the sheath is recorded by arranging a sound intensity sensor in the abnormal sound testing device of the vehicle driving shaft sheath, and abnormal sound is determined to occur when the recorded sound intensity is greater than a preset threshold value.
It should be noted that the method for testing the abnormal noise of the vehicle drive shaft sheath shown in fig. 5 may be performed at stage 2 in the general logic diagram of the method for testing the abnormal noise of the vehicle drive shaft sheath shown in fig. 2. In one embodiment, when a technician wishes to simulate the abnormal sound condition of a drive shaft sheath in a 3-kilometre comprehensive road test process of a whole vehicle, a second rotating speed required by a drive shaft corresponding to vehicle operation can be calculated according to a vehicle type, an operation scene and the like, and a second rotating speed and a preset number of times N are set according to actual conditions such as a time node where the abnormal sound generally occurs. For example, if the vehicle generally has abnormal noise when the vehicle runs at 2000km, the second number of revolutions is determined by calculating the number of revolutions of the driving shaft corresponding to the 2000km running time of the vehicle, the preset number N is obtained by calculating the ratio of 3 kilometres to 2000km, and the abnormal noise detection of step 202 is performed every time the test piece runs at the second number of revolutions.
In the same way, the method for acquiring the second rotating speed, the second rotating speed and the preset times N can be obtained when a technician hopes to simulate the abnormal sound condition of the driving shaft sheath after the vehicle passes through the comprehensive road test of any kilometer.
Optionally, on the basis of the embodiment of the method for testing the abnormal sound of the vehicle driving shaft sheath, during the axial rotation of the test piece, the swing angle of the second universal joint and the swing angle of the sheath can be detected by using the angle sensor, and the rotation speed of the test piece can be detected by using the rotation speed sensor.
Optionally, the method for testing the abnormal sound of the vehicle driving shaft sheath may further include: the data measured by the angle sensor and the rotational speed sensor are stored in the computer controller.
In implementation, during the axial rotation of the test piece, the swing angle of the second universal joint and the sheath and the rotation speed of the test piece are respectively detected by the angle sensor and the rotation speed sensor, the detected data are stored in the computer controller, and then a technician can analyze factors influencing the abnormal sound of the sheath of the driving shaft through subsequent data processing, so that the structure or the material of the sheath is pertinently improved, and the development time of the sheath is shortened.
In summary, the method for testing the abnormal sound of the vehicle driving shaft sheath provided by the embodiment of the invention can simulate the motion state and deformation condition of the driving shaft sheath after the vehicle runs for a long distance, and further accurately judge whether the abnormal sound occurs in the driving shaft sheath after the vehicle runs for a long distance. Meanwhile, the node for detecting the abnormal sound can be set according to the node where the abnormal sound of the sheath occurs, so that the change of the abnormal sound condition of the sheath in a long running time can be accurately recorded. In addition, the rotating speed of the test piece and the swing angle of the second universal joint and the sheath during the rotation of the test piece can be recorded, so that technical personnel can accurately analyze influence factors of abnormal sound of the sheath, and the development period of the drive shaft sheath is further shortened.
It should be noted that the above only provides the preferred embodiments of the vehicle driving axle sheath abnormal sound testing device and the testing method provided by the present application, and the present application is not limited thereto. The component composition of the device for testing the abnormal noise of the vehicle driving shaft sheath provided by the embodiment of the invention can be adjusted according to actual requirements, the sequence of the steps in the testing method can be properly adjusted, and the steps can be correspondingly increased or decreased according to the situation.
Claims (10)
1. The vehicle driving shaft sheath abnormal sound testing device is characterized in that the device is used for testing abnormal sound of a test piece, the test piece comprises a first universal joint, a second universal joint, a driving shaft rod and a sheath, the sheath comprises a large-diameter fixing part, a small-diameter fixing part and a middle part, the first universal joint is connected to a first side of the driving shaft rod, the sheath is sleeved on a second side of the driving shaft rod, the second side of the driving shaft rod is also connected with the second universal joint, the large-diameter fixing part of the sheath is fixedly connected with the second universal joint, the small-diameter fixing part of the sheath is fixedly connected with the driving shaft rod, the device comprises a headstock, a tailstock and a motor,
the headstock is suitable for being connected with the first universal joint through a spline, the tailstock is suitable for being connected with the second universal joint through a spline, and the motor is suitable for driving the test piece to rotate axially.
2. The vehicle driveshaft jacket abnormal sound testing apparatus of claim 1, further comprising a carriage structure, wherein the carriage structure is adapted to control a pivot angle of the second universal joint, wherein the carriage structure comprises a first sub carriage structure acting in a first direction and a second sub carriage structure acting in a second direction, and wherein the first direction and the second direction are perpendicular to each other.
3. The vehicle driveshaft jacket abnormal sound testing device according to claim 1, wherein the device further comprises a muddy water spraying structure adapted to spray muddy water to the jacket.
4. The vehicle drive shaft sheath abnormal sound testing device according to claim 1, wherein the device further comprises an angle sensor and a rotation speed sensor, the angle sensor is used for detecting the swing angle of the second universal joint and the sheath, and the rotation speed sensor is used for detecting the rotation speed of the test piece.
5. The vehicle driveshaft jacket abnormal sound testing device according to claim 4, further comprising a computer controller for storing data measured by the angle sensor and the rotational speed sensor.
6. A vehicle drive shaft sheath abnormal sound testing method is characterized by being used for a vehicle drive shaft sheath abnormal sound testing device, wherein the device is used for testing abnormal sound of a test piece, the test piece comprises a first universal joint, a second universal joint, a drive shaft rod and a sheath, the sheath comprises a large-diameter fixing part, a small-diameter fixing part and a middle section, the first universal joint is connected to a first side of the drive shaft rod, the sheath is sleeved on a second side of the drive shaft rod, the second side of the drive shaft rod is also connected with the second universal joint, the large-diameter fixing part of the sheath is fixedly connected with the second universal joint, the small-diameter fixing part of the sheath is fixedly connected with the drive shaft rod, the device comprises a headstock, a tailstock and a motor, the headstock is suitable for being connected with the first universal joint through splines, the tailstock is suitable for being connected with the second universal joint through splines,
the method comprises the following steps:
driving the test piece to axially rotate at a first rotation speed by a first rotation number by using the motor;
and judging whether abnormal sound exists or not during the axial rotation of the test piece.
7. The method of claim 6, wherein the device further comprises a carriage structure, the carriage structure comprises a first sub carriage structure acting in a first direction and a second sub carriage structure acting in a second direction, the first direction and the second direction are perpendicular to each other,
the method further comprises the following steps:
the second universal joint is controlled to swing in the radial direction within a preset angle range through the planker structure while the motor is used for driving the test piece to axially rotate at a first rotation speed by a first rotation speed;
and judging whether abnormal sound exists or not during the axial rotation of the test piece.
8. The method for testing the abnormal noise of a vehicle drive shaft sheath according to claim 7, wherein the device further comprises a muddy water spraying structure,
the method further comprises the following steps: repeatedly and sequentially executing mileage accumulation and abnormal sound detection for preset times;
wherein the mileage accumulation includes: the motor is used for driving the test piece to axially rotate at a second rotating speed for a second number of revolutions, the second universal joint is controlled to radially swing within a preset angle range through the planker structure during the second number of revolutions, and muddy water is sprayed to the sheath through the muddy water spraying structure;
the abnormal sound detection comprises the following steps: and driving the test piece to axially rotate at a third rotation speed by using the motor for a third number of revolutions, controlling the test piece to radially swing within a preset angle range by using the planker structure during the third rotation speed, and simultaneously judging whether the sheath makes abnormal sound.
9. The method for testing the abnormal noise of the sheath of the driving shaft of the vehicle according to any one of claims 6 to 8, wherein the device further comprises an angle sensor and a rotation speed sensor,
the method further comprises the following steps:
and during the axial rotation of the test piece, detecting the swing angles of the second universal joint and the sheath by using the angle sensor, and detecting the rotating speed of the test piece by using the rotating speed sensor.
10. The vehicle driveshaft jacket abnormal sound testing method according to claim 9, wherein the apparatus further comprises a computer controller,
the method further comprises the following steps: and storing the data measured by the angle sensor and the rotating speed sensor in a computer controller.
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Application publication date: 20210525 |