Noise test device for automobile steering wheels

Abstract

The invention discloses a noise testing device for a steering wheel of an automobile, which is used for noise detection of the steering wheel. The steering wheel includes an inner sleeve and an outer shell sleeved outside the inner sleeve. The noise testing device includes a rotating shaft, which includes a rotating shaft body and a locking assembly fixed to the end of the rotating shaft body. The rotating shaft body can rotate along its own axis, and the locking assembly is engaged with the inner sleeve and can drive the inner sleeve to rotate. A positioning mechanism is sleeved outside the rotating shaft body and is rotationally connected with the rotating shaft body. The positioning mechanism can reciprocate along the axial direction of the rotating shaft body under the drive of a linear drive assembly to approach or move away from the locking assembly. The positioning mechanism can abut against the end face of the outer shell to limit the steering wheel between the positioning mechanism and the locking assembly. The testing mechanism includes an acceleration sensor arranged on the positioning mechanism, and the acceleration sensor is used to collect the acceleration of the movement of the outer shell when it vibrates. The device can position the steering wheel, simulate the actual use of the steering wheel, and improve the efficiency of noise testing.

Description

Technical Field

[0001] The invention relates to the technical field of automobile parts detection, in particular to a noise testing device for an automobile steering wheel. Background Art

[0002] The steering wheel is an important component of the car. It plays an important role in the normal driving of the car. It controls the direction of the car and is closely related to our traffic safety. The car steering wheel usually includes an inner sleeve and an outer sleeve connected to the inner sleeve. The inner sleeve and the outer sleeve can produce relative rotation for steering. The steering wheel will generate noise when turning. The steering noise contributes greatly to the noise inside the car, especially the idling noise. Therefore, it is necessary to conduct noise testing on the car steering wheel. The existing test device has a complex structure and cannot quickly and conveniently simulate the actual use of the steering wheel. In addition, the existing test device usually uses a sound sensor to collect sound, which has high requirements for the test environment. Summary of the invention

[0003] To overcome the above shortcomings, the purpose of the present invention is to provide a noise testing device for a car steering wheel, which can quickly locate the steering wheel, simulate the actual use of the steering wheel, improve the testing efficiency, and adapt to relatively harsh testing environments.

[0004] In order to achieve the above purpose, the technical solution adopted by the present invention is: a noise testing device for a steering wheel of an automobile, used for noise detection of the steering wheel, the steering wheel comprises an inner sleeve and an outer shell sleeved outside the inner sleeve, and the noise testing device comprises:

[0005] The rotating shaft comprises a rotating shaft body and a locking assembly fixed to the end of the rotating shaft body, the rotating shaft body can rotate along its own axis, and the locking assembly is engaged with the inner sleeve and can drive the inner sleeve to rotate;

[0006] A positioning mechanism, the positioning mechanism is sleeved outside the rotating shaft body and is rotatably connected to the rotating shaft body. The positioning mechanism can reciprocate along the axial direction of the rotating shaft body under the drive of the linear drive assembly to approach or move away from the locking assembly. The positioning mechanism can abut against the end surface of the housing to limit the steering wheel between the positioning mechanism and the locking assembly.

[0007] The testing mechanism includes an acceleration sensor arranged on the positioning mechanism, and the acceleration sensor is used to collect the acceleration of the movement when the housing vibrates.

[0008] The beneficial effects of the present invention are:

[0009] The rotating shaft and the positioning mechanism form a fixing device, which can fix the position of the steering wheel and drive the inner sleeve of the steering wheel to rotate. The locking assembly fixes the position of the inner sleeve, and the positioning mechanism is sleeved outside the rotating shaft body and can slide relative to the rear body of the rotating shaft to approach the locking assembly and cooperate with the locking assembly to clamp the steering wheel and realize the positioning of the steering wheel. The locking assembly and the positioning mechanism realize the rapid fixing of the steering wheel, eliminate the axial gap between the outer shell and the inner sleeve, and facilitate operation. At the same time, the acceleration sensor is used to collect the acceleration when the outer shell vibrates to realize the noise test, and the noise test of the steering wheel can be quickly carried out, which greatly improves the test efficiency and test convenience.

[0010] Furthermore, the testing mechanism also includes a shell, the acceleration sensor is located inside the shell, an abutment piece passing through the shell is fixed to the end of the acceleration sensor, and a spring is arranged inside the shell to push the abutment piece to always abut against the shell. The abutment piece and the acceleration sensor can move synchronously along the axial direction of the shell toward the side away from the shell under the push of the shell.

[0011] When the housing vibrates, the abutment and the acceleration sensor can be pushed by the housing to move synchronously along the axial direction of the housing toward the side away from the housing, and can be quickly reset under the action of the spring. During this process, the acceleration sensor collects its own acceleration in real time, that is, the acceleration of the housing when it vibrates. When the vibration is large, the corresponding noise will be large, so the acceleration data can be converted into noise data.

[0012] Furthermore, the testing mechanism also includes a first flexible part and a second flexible part made of non-metallic material. The first flexible part is located between the shell and the abutment part and is fixedly connected to the abutment part. The second flexible part is located inside the shell. The two ends of the spring are respectively abutted against the first flexible part and the second flexible part, and the spring is always in a compressed state.

[0013] The shell and the spring are both metal parts. In order to transmit the vibration of the shell, the abutment must also be in rigid contact with the shell, so the abutment is also a metal part. However, when the metal abutment slides in the metal shell, it will cause the abutment to vibrate, affecting the accuracy of the data collected by the acceleration sensor and affecting the test results. Therefore, the first flexible part and the second flexible part are added to prevent vibration between the spring and the shell when the abutment moves, which will not affect the data collection of the acceleration sensor.

[0014] Further, the positioning mechanism includes a top plate and a positioning sleeve that are fixedly connected, the positioning sleeve is provided with a contoured straight key that matches the keyway on the shell, the contoured straight key can be inserted into the keyway, the top plate is located on the side of the positioning sleeve away from the locking assembly, the top plate abuts against the end face of the shell, and the linear drive assembly is fixedly connected to the top plate. The shell can be quickly positioned through the positioning mechanism and can drive the shell to move synchronously.

[0015] Furthermore, two groups of linear drive components are provided, and the two groups of linear drive components are symmetrically arranged on both sides of the rotating shaft body;

[0016] Each set of linear drive components includes a first cylinder and a second cylinder arranged at intervals along the moving direction of the positioning mechanism. The first cylinder and the second cylinder are coaxial and the telescopic shaft of the first cylinder is fixedly connected to the positioning mechanism. The second cylinder is located on the side of the first cylinder away from the positioning mechanism. The telescopic shaft of the second cylinder can extend into the first cylinder and press against the telescopic shaft of the first cylinder.

[0017] The linear drive assembly is coordinated with two cylinders, and the second cylinder supports the telescopic shaft of the first cylinder, which can increase the supporting force on the positioning mechanism, that is, the supporting force on the outer shell to meet the testing requirements of tightening the outer shell and the inner sleeve.

[0018] Further, the locking assembly includes a fixing member fixedly connected to the end of the rotating shaft body, a rotating cavity is formed in the fixing member, a rotating disk is arranged in the rotating cavity, the rotating disk rotates along the axis under the action of an external force, the rotating disk is provided with a plurality of constant velocity helical grooves symmetrical with respect to the center of the rotating disk, each constant velocity helical groove is slidably connected with a claw that can extend radially out of the fixing member, and the claw is clamped into the inner sleeve. The constant velocity helical groove guides the movement of the claw, and can be used for the production of small-sized locking assemblies.

[0019] Furthermore, the noise testing device also includes a fixed frame, a fixed sleeve is fixed on the fixed frame, the rotating shaft body is inserted into the fixed sleeve and is rotatably connected to the fixed sleeve, and a sliding sleeve is fixed on the positioning mechanism, the sliding sleeve is sleeved outside the fixed sleeve and is slidably connected to the fixed sleeve.

[0020] The setting of the fixed sleeve provides a transition for the rotational connection between the rotating shaft and the fixed frame. The fixed sleeve is fixed and does not rotate, so the positioning mechanism sleeved outside it does not rotate either, thus realizing the rotational connection between the rotating shaft and the positioning mechanism. The sliding sleeve reduces the wear of the positioning mechanism and increases the service life of the positioning mechanism.

[0021] Furthermore, the noise testing device also includes a clamping mechanism, which can limit the rotation of the rotating shaft to avoid the rotation of the rotating shaft when no test is performed, thereby facilitating the installation of the steering wheel.

[0022] The clamping mechanism comprises a clamping cylinder and a clamping block. The clamping block can move along the direction perpendicular to the axial direction of the rotating shaft under the push of the clamping cylinder. A plane that can abut against the clamping block is arranged on the rotating shaft body.

[0023] Furthermore, the noise testing device also includes a workbench, on which a plurality of supporting airbags are fixed, and a fixing frame is fixed on the supporting airbags, and the supporting airbags can be inflated to separate the fixing frame from the workbench.

[0024] During the test, air is inflated into the support airbag, which props up the fixed frame to separate it from the workbench, so as to avoid vibration between the workbench and the fixed frame, which may affect the test results.

[0025] Furthermore, a toggle mechanism is also provided on one side of the fixing frame, and the toggle mechanism is used to toggle a lever on the steering wheel, and the noise test is performed when the steering wheel lever is toggled through the lever mechanism.

[0026] The toggle mechanism comprises a rotating plate which can rotate in a vertical plane, and two abutment rods are fixed on the rotating plate. When the rotating plate rotates, the two abutment rods respectively abut against the toggle rods to push the toggle rods to swing up and down. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A schematic diagram of the structure of a steering wheel in one embodiment of the present invention;

[0028] Figure 2 It is a schematic diagram of the connection between the rotating shaft and the positioning mechanism in one embodiment of the present invention;

[0029] Figure 3 A schematic diagram of another angle of connection between the rotating shaft and the positioning mechanism in one embodiment of the present invention;

[0030] Figure 4 A cross-sectional view of a testing device along the axial direction of the rotating shaft in one embodiment of the present invention;

[0031] Figure 5 It is a schematic diagram of the three-dimensional structure of a testing mechanism in one embodiment of the present invention;

[0032] Figure 6 is a cross-sectional view of a testing mechanism in one embodiment of the present invention;

[0033] Figure 7 It is a schematic diagram of the connection between the positioning mechanism and the connecting shaft body in one embodiment of the present invention;

[0034] Figure 8 A cross-sectional view of a connection state between a positioning mechanism and a connecting shaft body in one embodiment of the present invention;

[0035] Fig. 9 It is a structural schematic diagram of a locking assembly in one embodiment of the present invention;

[0036] Fig.10 It is a schematic diagram of the matching state of the rotating disk and the clamping claws in one embodiment of the present invention;

[0037] Fig.11 It is a schematic diagram of the three-dimensional structure of a testing device in one embodiment of the present invention;

[0038] Fig.12 It is a schematic diagram of the three-dimensional structure of the toggle mechanism in one embodiment of the present invention.

[0039] In the figure:

[0040] 100, steering wheel; 1a, inner sleeve; 1b, outer sleeve; 1c, lever;

[0041] 1. Rotation axis;

[0042] 11. rotating shaft body; 111. plane; 112. positioning groove;

[0043] 12. locking assembly; 121. fixing member; 122. rotating disk; 1221. constant velocity spiral groove; 123. claw; 1231. clamping part; 1232. guide pin; 124. force rod; 125. positioning pin; 126. light shielding rod;

[0044] 13. Rotating drive member;

[0045] 2. Positioning mechanism; 21. Top plate; 22. Positioning sleeve; 221. Profile straight key;

[0046] 3. Testing mechanism; 31. Acceleration sensor; 32. Housing; 321. First convex edge; 33. Abutment member; 34. Spring; 35. First flexible member; 351. Second convex edge; 36. Second flexible member; 37. Connecting frame; 371. Waist-shaped hole;

[0047] 4. Linear drive assembly; 41. First cylinder; 42. Second cylinder;

[0048] 5. Fixed frame; 51. Fixed sleeve; 52. Sliding sleeve; 53. Bearing;

[0049] 6. Clamping mechanism; 61. Clamping cylinder; 62. Clamping block;

[0050] 7. Workbench; 71. Support airbag; 72. Support frame; 73. Counterweight;

[0051] 8. toggle mechanism; 81. abutment rod; 82. rotating plate; 83. rotating cylinder;

[0052] 9. Marking organization. DETAILED DESCRIPTION

[0053] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0054] The noise testing device for a steering wheel of an automobile of the present invention is used for noise detection of a steering wheel 100, see the attached Figure 1As shown, the steering wheel 100 includes an inner sleeve 1a and an outer shell 1b sleeved outside the inner sleeve 1a, and the outer shell 1b and the inner shell can rotate relative to each other. The steering wheel 100 also includes a lever 1c, and the lever 1c can swing up and down relative to the outer shell 1b. During the test, the noise test needs to be performed in two situations: the inner sleeve 1a and the outer shell 1b rotate relative to each other and the lever 1c is moved.

[0055] See attached Figure 2 , Attachment Figure 3 and attached Figure 4 As shown, the noise testing device includes a rotating shaft 1, a positioning mechanism 2 and a testing mechanism 3. The rotating shaft 1 is used to drive the inner sleeve 1a to rotate, the positioning mechanism 2 is used to fix the outer sleeve 1b, and the testing mechanism 3 is used to collect test data and perform noise analysis.

[0056] The rotating shaft 1 includes a rotating shaft body 11 and a locking assembly 12 fixed to the end of the rotating shaft body 11. The rotating shaft body 11 can rotate along its own axis. The rotation direction of the rotating shaft body 11 is shown in the attached Figure 8 As shown in the hollow arrow in the figure, the locking assembly 12 is engaged with the inner sleeve 1a and can drive the inner sleeve 1a to rotate. After the locking assembly 12 is engaged with the inner sleeve 1a, on the one hand, the position of the inner sleeve 1a can be fixed, and on the other hand, the inner sleeve 1a can be driven to rotate.

[0057] The positioning mechanism 2 is sleeved outside the rotating shaft body 11 and is rotatably connected to the rotating shaft body 11. When the rotating shaft body 11 rotates, the positioning mechanism 2 does not rotate synchronously. The positioning mechanism 2 can reciprocate along the axial direction of the rotating shaft body 11 under the drive of the linear drive assembly 4 to approach or move away from the locking assembly 12. The moving direction of the positioning mechanism 2 is shown in the attached Figure 8 As shown by the arrow in , when the positioning mechanism 2 moves toward the locking assembly 12, the distance between the two becomes smaller, and the end faces of the positioning mechanism 2 and the outer shell 1b abut against each other to limit the steering wheel 100 between the positioning mechanism 2 and the locking assembly 12. At this time, the positioning mechanism 2 presses the outer shell 1b axially, because the locking assembly 12 defines the position of the inner sleeve 1a. At this time, the entire steering wheel is loaded, the steering wheel is fixed in the axial position as a whole, and the axial spacing between the outer shell 1b and the inner sleeve 1a is eliminated, and no offset occurs during the test, simulating the actual use of the steering wheel 100. The distance moved by the positioning mechanism 2 in the axial direction is small, and it only moves slightly, mainly to press the outer shell 1b tightly and provide support for the outer shell 1b.

[0058] The test mechanism 3 includes an acceleration sensor 31 fixed on the positioning mechanism 2, and the acceleration sensor 31 is used to collect the acceleration of the outer shell 1b when it vibrates. The test mechanism 3 and the positioning mechanism 2 move synchronously. When the outer shell 1b and the inner sleeve 1a rotate, the outer shell 1b will vibrate, and this vibration will be recorded by the acceleration sensor 31. When the vibration is large, the corresponding noise will be large, so the acceleration data can be converted into noise data.

[0059] In the prior art, the outer shell 1b and the rotating inner sleeve 1a of the steering wheel 100 are manually fixed, and the axial spacing between the outer shell 1b and the inner sleeve 1a is not easy to eliminate, which is easy to interfere with the test results. Because the sound sensor has high requirements for the environment, it has high requirements for the sound of the environment. It is impossible to use the rotating drive member 13 to drive the inner sleeve 1a to rotate, otherwise the sound of the rotating drive member 13 will be collected, affecting the test results. In this embodiment, the rotating shaft 1 and the positioning mechanism 2 form a fixing device, which can fix the position of the steering wheel 100 and drive the inner sleeve 1a of the steering wheel 100 to rotate. The locking assembly 12 fixes the position of the inner sleeve 1a, and the positioning mechanism 2 is sleeved on the outside of the rotating shaft body 11 and can slide relative to the rear body of the rotating shaft 1 to approach the locking assembly 12 and cooperate with the locking assembly 12 to clamp the steering wheel 100 and realize the positioning of the steering wheel 100. The locking assembly 12 and the positioning mechanism 2 in this embodiment realize the rapid fixing of the steering wheel 100, eliminate the axial gap between the outer shell 1b and the inner sleeve 1a, and facilitate operation. At the same time, the acceleration sensor is used to collect the acceleration of the housing 1b when it vibrates to implement noise testing, and the noise test of the steering wheel 100 can be quickly performed, which greatly improves the test efficiency and test convenience.

[0060] In one embodiment, see the attached Figure 5 and attached Figure 6 As shown, the test mechanism 3 also includes a housing 32, which is fixed to the positioning mechanism 2 through a connecting frame 37 so as to rotate synchronously with the positioning mechanism 2. The acceleration sensor 31 is located in the housing 32, and an abutment member 33 passing through the housing 32 is fixed at the end of the acceleration sensor 31, and a first opening for the abutment member 33 to pass through is provided at one end of the housing 32 close to the steering wheel 100. A spring 34 is arranged in the housing 32, and the spring 34 pushes the abutment member 33 to always abut against the housing 1b, that is, a force is applied to the abutment member 33 to move toward the housing 1b. When the housing 1b vibrates, the abutment member 33 and the acceleration sensor 31 can be pushed by the housing 1b to move synchronously along the axial direction of the housing 32 toward the side away from the housing 32, and can be quickly reset under the action of the spring 34. In this process, the acceleration sensor 31 collects the acceleration of its own movement in real time, that is, the acceleration of the housing 32 when it vibrates.

[0061] The axis of the shell 32 is parallel to the axis of the rotating shaft 1. At this time, the abutment member 33 and the shell 32 are perpendicular. All vibrations of the shell 1b can be transferred to the abutment member 33, and the detection result of the acceleration sensor 31 is more accurate.

[0062] The shell 32 and the spring 34 are both metal parts. In order to transmit the vibration of the shell 1b, the abutment 33 must also be in rigid contact with the shell 1b, so the abutment 33 is also a metal part. However, when the abutment 33 made of metal material slides in the shell 32 made of metal material, the abutment 33 will vibrate, affecting the accuracy of the data collected by the acceleration sensor 31 and affecting the test results. Therefore, in one embodiment, the test mechanism 3 also includes a first flexible member 35 and a second flexible member 36 made of non-metallic material. The first flexible member 35 is located between the shell 32 and the abutment 33 and is fixedly connected to the abutment 33. The end of the abutment 33 passes through the first flexible member 35 and abuts against the shell 1b, that is, the first flexible member 35 does not completely cover the abutment 33. The second flexible member 36 is located in the shell 32, and the two ends of the spring 34 abut against the first flexible member 35 and the second flexible member 36 respectively.

[0063] The added first flexible member 35 enables flexible contact between the abutting member 33 and the housing 32. At the same time, the first flexible member 35 and the second flexible member 36 abut against both ends of the spring 34, so that when the spring 34 is extended and retracted, it will not vibrate with the housing 32, and will not interfere with the data collected by the acceleration sensor 31. Exemplarily, the first flexible member 35 is a silicone member, and the second flexible member 36 is foam.

[0064] The spring 34 forms a cavity in which the acceleration sensor 31 is located. A second opening is provided at one end of the housing 32 away from the steering wheel 100. A cable connected to the acceleration sensor 31 passes through the second flexible member 36 and the second opening and extends outside the housing 32 to be connected to an external controller.

[0065] The housing 32 is provided with a first flange 321 extending inwardly thereof at the first opening along the circumferential direction, and the first flexible member 35 includes a second flange 351 extending outwardly along the circumferential direction. The first flange 321 can abut against the second flange 351 to limit the distance that the abutment member 33 extends out of the housing 32. Before the test, the spring 34 pushes the abutment member 33 toward the locking assembly 12, at which time the first flange 321 and the second flange abut against each other, and the spring 34 is in a compressed state. When the test mechanism 3 is ready for the test, a gap is left between the first flange 321 and the second flange 351, that is, the two are separated, and at this time, space is provided for the abutment member 33 to reciprocate in the axial direction.

[0066] The acceleration sensor 31 and the abutting member 33 are coaxial and threadedly connected, and the abutting member 33 is rotated to adjust the initial position of the abutting member 33. The abutting member 33 and the first flexible member 35 are interference-connected, and the two rotate and move synchronously.

[0067] The connecting frame 37 is connected to the positioning mechanism 2 through bolts. The connecting frame 37 and the shell 32 are formed as one piece. The connecting frame 37 is provided with a waist-shaped hole 371 for the bolt to pass through. The waist-shaped hole 371 is perpendicular to the axis of the rotating shaft 1. Through the cooperation of the waist-shaped hole 371 and the bolt, the position of the connecting frame 37 can be adjusted within a certain range, and then the acceleration sensor 31 can be adjusted to a suitable test position.

[0068] See attached Figure 7 As shown, the positioning mechanism 2 includes a top plate 21 and a positioning sleeve 22 that are fixedly connected, and the two are an integral part or a split structure. The rotating shaft 1 passes through the positioning sleeve 22 and the top plate 21. The positioning sleeve 22 is provided with a profile straight key 221 that matches the keyway on the shell 1b. The profile straight key 221 can be inserted into the keyway. When the shell 1b is fixed on the positioning mechanism 2, the profile straight key 221 is inserted into the keyway to achieve preliminary positioning of the two. The shape of the profile straight key 221 can be changed according to the keyway of different steering wheels 100. The top plate 21 is located on the side of the positioning sleeve 22 away from the locking assembly 12, and the top plate 21 abuts against the end face of the shell 1b, and the linear drive assembly 4 is fixedly connected to the top plate 21. The top plate 21 extends outward along the circumference of the positioning sleeve 22. The shape of the top plate 21 is not limited, and can be a circular ring or a square, as long as it can abut against the end face of the shell 1b, and the shell 1b can be pressed against in the axial direction. The housing 1b can be quickly positioned by the positioning mechanism 2, and can drive the housing 1b to move synchronously.

[0069] There are two groups of linear drive components 4 , which are symmetrically arranged on both sides of the rotating shaft body 11 , to push the positioning mechanism 2 from both sides, thereby improving the stability of the linear movement of the positioning mechanism 2 .

[0070] In one embodiment, see the attached Figure 3 As shown, each group of linear drive components 4 includes two first cylinders 41 and second cylinders 42 arranged at intervals along the moving direction of the positioning mechanism 2. The first cylinder 41 and the second cylinder 42 are coaxial and the telescopic shaft of the first cylinder 41 is fixedly connected to the positioning mechanism 2. The second cylinder 42 is located on the side of the first cylinder 41 away from the positioning mechanism 2. The telescopic shaft of the second cylinder 42 can extend into the first cylinder 41 and press against the telescopic shaft of the first cylinder 41. The second cylinder 42 provides support for the telescopic shaft of the first cylinder 41, because the top plate 21 requires a large force to support the outer shell 1b. Therefore, two cylinders are used in this example. The second cylinder 42 supports the telescopic shaft of the first cylinder 41, which can increase the support force on the positioning mechanism 2, that is, the support force on the outer shell 1b. At this time, the test requirements of pressing against the outer shell 1b and the inner sleeve 1a can be met.

[0071] The first cylinder 41 is a bidirectional cylinder. Although the second cylinder 42 is separated from the first cylinder 41, the telescopic axes of the two are coaxial. The telescopic axis of the second cylinder 42 can be separated from or abutted against the telescopic axis of the first cylinder 41 during movement. When the telescopic axis of the second cylinder 42 abuts against the telescopic axis of the first cylinder 41, the second cylinder 42 supports the telescopic axis of the first cylinder 41.

[0072] In one embodiment, each set of linear drive components 4 may also include only the first cylinder 41. One cylinder can also push the positioning mechanism 2 to move and provide supporting force, but a larger first cylinder 41 is required to meet the supporting force requirement.

[0073] See attached Figure 3 and attached Figure 5 As shown, the noise test device also includes a fixing frame 5, and the linear drive assembly 4 is fixed on the fixing frame 5. A fixing sleeve 51 is fixed on the fixing frame 5, and the rotating shaft body 11 is inserted into the fixing sleeve 51 and is rotatably connected to the fixing sleeve 51, see the attached Figure 8 As shown, at least one bearing 53 is provided between the fixed sleeve 51 and the rotating shaft body 11, and the bearing 53 provides support and guidance for the rotation of the rotating shaft body 11. A sliding sleeve 52 is fixed to the positioning mechanism 2, and the sliding sleeve 52 is sleeved outside the fixed sleeve 51 and is slidably connected to the fixed sleeve 51.

[0074] In the embodiment, the setting of the fixed sleeve 51 provides a transition for the rotational connection between the rotating shaft 1 and the fixed frame 5. The fixed sleeve 51 is fixed and does not rotate, so the positioning mechanism 2 sleeved outside it does not rotate either, thereby realizing the rotational connection between the rotating shaft 1 and the positioning mechanism 2.

[0075] In one embodiment, the sliding sleeve 52 and the fixed sleeve 51 are both copper sleeves, which are wear-resistant and have a long service life.

[0076] A rotating drive member 13 is fixed on the fixed frame 5. The rotating drive member 13 is a rotating motor, which is connected to the rotating shaft body 11 through a coupling. When the rotating drive member 13 is working, it can drive the rotating shaft 1 and the inner sleeve 1a on the rotating shaft 1 to rotate.

[0077] In one embodiment, because the rotary drive member 13 does not have a braking function, the noise testing device further includes a positioning mechanism 2, which can limit the rotation of the rotating shaft 1. Before the test, that is, when the testing device is not testing, the positioning mechanism 2 always locks the rotating shaft 1, and the rotating shaft 1 will not rotate at this time, so that the position of the locking assembly 12 will not move, which is convenient for fixing the steering wheel 100. During the test, the positioning mechanism 2 releases the lock on the rotating shaft 1, and the rotating shaft 1 can rotate for testing.

[0078] See attached Figure 4As shown, the clamping mechanism 6 includes a clamping cylinder 61 and a clamping block 62. The clamping block 62 can move in a direction perpendicular to the axial direction of the rotating shaft 1 under the push of the clamping cylinder 61. The rotating shaft body 11 is provided with a plane 111 that can abut against the clamping block 62. When the clamping block 62 is pressed against the plane 111, the rotating shaft body 11 is in a locked state, and the rotating shaft body 11 cannot rotate at this time. When the clamping block 62 and the plane 111 are separated, the rotating shaft body 11 is in a rotatable state.

[0079] The plane 111 is arranged on the side of the rotating shaft body 11 passing through the fixing sleeve 51 and close to the rotating driving member 13 . The clamping mechanism 6 is located above the rotating shaft body 11 , which facilitates the clamping mechanism 6 to apply force. The clamping cylinder 61 is fixed on the fixing frame 5 .

[0080] In one embodiment, when the rotary drive member 13 has a braking function, the noise testing device may not be provided with the clamping mechanism 6 .

[0081] See attached Fig. 9 and attached Fig.10 As shown, the locking assembly 12 includes a fixing member 121 fixedly connected to the end of the rotating shaft body 11, and the fixing member 121 is fixed to the rotating shaft body 11 by bolts. A rotating cavity is formed in the fixing member 121, and a rotating disk 122 is arranged in the rotating cavity. The rotating disk 122 rotates along the axis under the action of an external force. The rotating disk 122 is provided with three constant velocity spiral grooves 1221 that are symmetrical relative to the center of the rotating disk 122. A claw 123 that can extend radially out of the fixing member 121 is slidably connected in each constant velocity spiral groove 1221. The claw 123 can be clamped into the inner sleeve 1a, and a clamping groove corresponding to the claw 123 is arranged on the inner sleeve 1a. When the claw 123 moves to the two ends of the constant velocity spiral groove 1221, it is respectively in the state of extending the fixing member 121 and retracting the fixing member 121. The constant velocity spiral groove 1221 can not only drive the claw 123 to move, but also limit the moving distance of the claw 123.

[0082] The shape and number of the claws 123 are set according to the slot on the inner sleeve 1a, and two or four claws 123 may be set. The claws 123 are contoured parts that match the slots, but can extend or retract the claws 123 when the rotating disk 122 rotates. Referring to the accompanying drawings, when the rotating disk 122 is rotated clockwise or counterclockwise, the claws 123 will extend or retract the fixing member 121.

[0083] The clamping claw 123 includes a clamping portion 1231 and a guide pin 1232 which are fixedly connected. The clamping portion 1231 can extend out of the fixing member 121 and be clamped into the clamping slot. The guide pin 1232 is inserted into the constant velocity spiral groove 1221 and slides along the constant velocity spiral groove 1221. In this embodiment, the shape of the clamping portion 1231 is different because the shape of the clamping slot on the inner sleeve 1a is different. The part of the clamping portion 1231 that is clamped into the clamping slot needs to match the collision of the clamping slot. In order to improve the stability of the movement of the clamping claw 123, a guide groove corresponding to the clamping portion 1231 is also provided on the fixing member 121. The guide groove is connected to the rotating cavity, and the clamping portion 1231 moves back and forth in the guide groove.

[0084] In this embodiment, the guide pin 1232 and the constant velocity spiral groove 1221 are used in combination to achieve the extension and retraction of the claw 123, which can be used for the production of a small-sized locking assembly 12.

[0085] In one embodiment, the fixing member 121 is a split member formed by splicing a plurality of blocks, including a bottom cover and an upper cover that are detachably connected. The fixing member 121 adopts a split structure to facilitate processing and assembly.

[0086] See attached Fig. 9 As shown, the fixing member 121 is also rotatably connected with a force rod 124, which is coaxial with the fixing member 121 and the rotating disk 122. The force rod 124 is fixed to the rotating disk 122 and passes through the fixing member 121. The force rod 124 passing through the fixing member 121 is located on a side of the fixing member 121 away from the rotating shaft body 11. The operator holds the force rod 124 or rotates the rotating disk 122 with a screwdriver, thereby extending or retracting the claw 123.

[0087] Of course, in one embodiment, the force application rod 124 can also be driven to rotate by an electric drive member.

[0088] The rotating shaft body 11 and the locking assembly 12 need to maintain a certain degree of coaxiality, so that the rotating shaft body 11 can drive the inner sleeve 1a to rotate. Because the locking assembly 12 also includes a positioning pin 125, a slot for the end of the rotating shaft body 11 to be inserted is provided on the side of the fixing member 121 close to the rotating shaft body 11, and the positioning pin 125 is located in the slot and the axes of the two are parallel. The positioning pin 125 is partially embedded in the side wall of the slot and partially located in the slot. See the attached Figure 7 As shown, the rotating shaft body 11 inserted into the slot is provided with a positioning groove 112 for partially inserting the positioning pin 125 in the slot. The coaxiality of the rotating shaft body 11 and the locking assembly 12 is ensured by the cooperation between the positioning pin 125 and the positioning groove 112.

[0089] In one embodiment, the locking assembly 12 further includes a detection unit, which is used to detect the state of the locking assembly 12, that is, to detect whether the claw 123 of the locking assembly 12 is in an extended state or a retracted state. The detection unit includes a light shielding rod 126 and a detection sensor. The light shielding rod 126 is fixed on the force rod 124 and protrudes from the force rod 124. The detection sensor is used to detect the position of the force rod 124. When the force rod 124 rotates to the extended state of the claw 123, the detection sensor generates a signal. Exemplarily, the detection sensor is a reflective photoelectric sensor. Only when the detection sensor detects that the claw 123 is in an extended state, it means that the inner sleeve 1a has been fixed. At this time, the positioning mechanism 2 will move to press against the outer shell 1b.

[0090] See attached Figure 2 As shown, the testing device also includes a marking mechanism 9, which is fixed on the top plate 21 of the positioning mechanism 2. The marking mechanism 9 is located below the rotating shaft 1 and the steering wheel 100. The marking mechanism 9 is used to mark the steering gear that has completed the test, so as to distinguish the steering wheels 100 that have completed the test and those that have not been tested.

[0091] The marking mechanism 9 includes a marking drive and a marking pen. The marking drive workpiece is fixed on the top plate 21. The marking pen is connected to the marking drive and is driven by the marking drive to move closer to or farther from the steering wheel 100. The marking drive is a linear module, such as a cylinder.

[0092] In one embodiment, the rotating shaft body 11 is tilted upward relative to the horizontal plane, and the tilt angle is related to the installation condition of the steering wheel 100 when it is actually used. For example, when the steering wheel 100 is in use, the angle with the plane is 30°, and the angle between the rotating shaft body 11 and the plane is 30°. The locking assembly 12 is located at the high end of the rotating shaft body 11, and the rotating drive member 13 is located at the low end of the rotating shaft body 11. At the same time, it can provide more placement space for the testing mechanism 3 and the marking mechanism 9, and the space utilization rate is high.

[0093] See attached Fig.11 As shown, the noise testing device further includes a workbench 7 , on which a plurality of supporting airbags 71 are fixed, and the fixing frame 5 is fixed on the supporting airbags 71 , and the supporting airbags 71 can be inflated to separate the fixing frame 5 from the workbench 7 .

[0094] Because the fixing frame 5 is directly placed on the workbench 7, the two may produce relative vibration and affect the test results. Therefore, it is necessary to set a supporting airbag 71 to support the fixing frame 5. When testing, the supporting airbag 71 is inflated, and the supporting airbag 71 props up the fixing frame 5 to separate it from the workbench 7. The supporting airbag 71 isolates the workbench from the fixing frame and eliminates the interference of background noise. When the test is completed, the supporting airbag 71 is deflated to allow the fixing frame 5 to be carried on the workbench 7.

[0095] See attached Fig.11 As shown, the workbench 7 is fixed on a support frame 72, which is placed on the ground, and a counterweight 73 is also fixed on the support frame 72. The weight of the support frame 72 is increased to be much greater than the overall weight of the fixed frame 5 on which the steering wheel 100 is placed, so as to reduce the possibility of resonance between the workbench 7 and the steering wheel 100. The vibration frequency during the test is kept away from the natural frequency of the equipment and the workshop environment to prevent the formation of resonance, eliminate interference, and improve the accuracy of the test.

[0096] See attached Fig.11 As shown, a toggle mechanism 8 is also provided on one side of the fixing frame 5 for toggling the lever 1c on the steering wheel 100. When the toggle mechanism 8 toggles the lever 1c, the acceleration of the housing 1b during vibration is synchronously collected to perform a noise test when the lever 1c is toggled.

[0097] In one embodiment, see the attached Fig.12 As shown, the toggle mechanism 8 includes a bracket fixed on the workbench 7, on which a rotating cylinder 83 is fixed. The rotating cylinder 83 drives a rotating plate 82 to rotate in a vertical plane. Two abutment rods 81 are fixed on the rotating plate 82. When the rotating plate 82 rotates, the two abutment rods 81 respectively abut against the toggle rod 1c to push the toggle rod 1c to swing up and down.

[0098] In one embodiment, the toggle mechanism 8 may be a robot arm fixed on the workbench 7 , and the robot arm is used to toggle the toggle rod 1 c to swing up and down.

[0099] The present invention also discloses a noise testing method, which is based on the above-mentioned noise testing device, that is, the working process of the above-mentioned noise testing device, specifically comprising:

[0100] The steering wheel 100 is mounted on the locking assembly 12 , and the slot on the inner sleeve 1 a is aligned with the locking assembly 12 , and the keyway on the outer sleeve 1 b is aligned with the contoured straight key 221 .

[0101] The force-applying rod 124 is rotated to allow the claw 123 to engage in the slot of the inner sleeve 1 a.

[0102] The linear drive assembly 4 drives the positioning mechanism 2 to move toward the steering wheel 100 until the top plate 21 of the positioning mechanism 2 abuts against the end surface of the housing 1b of the steering wheel 100, and the positioning mechanism 2 axially presses against the steering wheel 100. At this time, the abutment member 33 of the testing mechanism 3 abuts against the end surface of the housing 1b, and a gap is left between the first flange 321 and the second flange.

[0103] The rotary drive member 13 drives the rotary shaft 1 to rotate, thereby driving the inner sleeve 1 a of the steering wheel 100 to rotate, and the acceleration sensor 31 of the testing mechanism 3 collects the acceleration speed value in real time.

[0104] The shifting mechanism 8 shifts the lever 1c on the steering wheel 100, and the acceleration sensor 31 of the testing mechanism 3 collects the acceleration speed value in real time.

[0105] The above implementation modes are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with this technology to understand the content of the present invention and implement it, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A noise testing device for a steering wheel of an automobile, used for noise detection of a steering wheel, wherein the steering wheel comprises an inner sleeve and an outer sleeve sleeved outside the inner sleeve, and is characterized in that: The noise testing device comprises: A rotating shaft, the rotating shaft comprising a rotating shaft body and a locking assembly fixed to the end of the rotating shaft body, the rotating shaft body can rotate along its own axis, the locking assembly is engaged with the inner sleeve and can drive the inner sleeve to rotate; A positioning mechanism, the positioning mechanism is sleeved outside the rotating shaft body and is rotatably connected to the rotating shaft body, the positioning mechanism can reciprocate along the axial direction of the rotating shaft body under the drive of the linear drive assembly to approach or move away from the locking assembly, and the positioning mechanism can abut against the end surface of the housing to confine the steering wheel between the positioning mechanism and the locking assembly; The testing mechanism comprises an acceleration sensor arranged on the positioning mechanism, and the acceleration sensor is used to collect the acceleration of the movement of the housing when it vibrates.

2. The noise testing device for a vehicle steering wheel according to claim 1, characterized in that: The testing mechanism also includes a shell, the acceleration sensor is located in the shell, an abutment piece passing through the shell is fixed to the end of the acceleration sensor, a spring is arranged in the shell to push the abutment piece to always abut against the outer shell, and the abutment piece and the acceleration sensor can move synchronously along the axial direction of the shell toward a side away from the shell under the push of the shell.

3. The noise testing device for automobile steering wheel according to claim 2, characterized in that: The testing mechanism also includes a first flexible part and a second flexible part made of non-metallic material. The first flexible part is located between the shell and the abutment part and is fixedly connected to the abutment part. The second flexible part is located inside the shell. The two ends of the spring are respectively against the first flexible part and the second flexible part, and the spring is always in a compressed state.

4. The noise testing device for a vehicle steering wheel according to claim 1, characterized in that: The positioning mechanism includes a top plate and a positioning sleeve that are fixedly connected. The positioning sleeve is provided with a contoured straight key that matches the keyway on the shell, and the contoured straight key can be inserted into the keyway. The top plate is located on the side of the positioning sleeve away from the locking assembly. The top plate abuts against the end face of the shell, and the linear drive assembly is fixedly connected to the top plate.

5. The noise testing device for automobile steering wheel according to claim 1, characterized in that: The linear drive components are provided in two groups, and the two groups of linear drive components are symmetrically arranged on both sides of the rotating shaft body; Each group of the linear drive components includes two first cylinders and a second cylinder arranged at intervals along the moving direction of the positioning mechanism. The first cylinder and the second cylinder are coaxial and the telescopic shaft of the first cylinder is fixedly connected to the positioning mechanism. The second cylinder is located on the side of the first cylinder away from the positioning mechanism, and the telescopic shaft of the second cylinder can extend into the first cylinder and press against the telescopic shaft of the first cylinder.

6. The noise testing device for automobile steering wheel according to claim 1, characterized in that: The locking assembly includes a fixing part fixedly connected to the end of the rotating shaft body, a rotating cavity is formed in the fixing part, a rotating disk is arranged in the rotating cavity, the rotating disk rotates around the axis under the action of external force, the rotating disk is provided with a plurality of constant velocity spiral grooves symmetrical with respect to the center of the rotating disk, each of the constant velocity spiral grooves is slidably connected with a claw that can extend radially from the fixing part, and the claw is clamped in the inner sleeve.

7. The noise testing device for a vehicle steering wheel according to any one of claims 1 to 6, characterized in that: The noise testing device also includes a fixing frame, a fixing sleeve is fixed on the fixing frame, the rotating shaft body is inserted into the fixing sleeve and is rotatably connected to the fixing sleeve, and a sliding sleeve is fixed on the positioning mechanism, the sliding sleeve is sleeved outside the fixing sleeve and is slidably connected to the fixing sleeve.

8. The noise testing device for a vehicle steering wheel according to claim 1, characterized in that: The noise testing device further comprises a clamping mechanism, and the clamping mechanism can limit the rotation of the rotating shaft; The clamping mechanism comprises a clamping cylinder and a clamping block. The clamping block can move in a direction perpendicular to the axial direction of the rotating shaft under the push of the clamping cylinder. A plane that can abut against the clamping block is arranged on the rotating shaft body.

9. The noise testing device for a vehicle steering wheel according to claim 7, characterized in that: The noise testing device also includes a workbench, on which a plurality of supporting airbags are fixed, and the fixing frame is fixed on the supporting airbags, and the supporting airbags can be inflated to separate the fixing frame from the workbench.

10. The noise testing device for automobile steering wheel according to claim 7, characterized in that: A toggle mechanism is also provided on one side of the fixing frame, and the toggle mechanism is used to toggle the toggle lever on the steering wheel; The toggle mechanism comprises a rotating plate that can rotate in a vertical plane, and two abutment rods are fixed on the rotating plate. When the rotating plate rotates, the two abutment rods respectively abut against the toggle rods to push the toggle rods to swing up and down.

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