Abnormal sound test bench for steering pull rod

Abstract

The invention provides an abnormal sound test bed for a steering pull rod. The abnormal sound test bed comprises a base, a positioning table and an excitation mechanism, the positioning table and the shock excitation mechanism are fixedly connected with the upper side of the base, and the shock excitation mechanism is arranged on the x-direction side edge of the base; the vibration excitation mechanism comprises a fixing frame, a vibration frame, a driving assembly and a plurality of elastic connecting pieces, the driving assembly comprises a transmission end capable of vibrating in the x direction, the transmission end is fixedly connected with the vibration frame, and each elastic connecting piece comprises an elastic piece, a first connecting part and a second connecting part. The first connecting part and the second connecting part are connected with the fixing frame and the vibrating frame respectively and enable the elastic piece to be arranged perpendicular to the x direction, the vibrating frame is provided with an installation base face arranged perpendicular to the x direction, and a butt joint is fixedly connected to the installation base face. According to the invention, the elastic connecting piece is arranged to limit the vibration frame, so that the vibration frame can only vibrate in the x direction, and the accuracy of abnormal sound test is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of automobile detection, in particular to an abnormal noise test bench for a steering rod. Background Art

[0002] Chassis noise performance is an important indicator of the superior quality of automobile products, and directly affects the comfort and reliability of the vehicle. During vehicle operation, the steering noise caused by the operation of the steering gear is an important component of chassis noise. As one of the main components of the steering gear, the steering rod is one of the objects of chassis noise performance research.

[0003] In the prior art, the steering tie rod is located at both ends of the steering gear. Therefore, when detecting the abnormal noise of the steering tie rod, taking the patent document with application number CN202320126636.5 as an example, a fixed frame is usually set up to connect the middle part of the steering gear with the fixed frame, and an exciter is set at both ends of the fixed frame, so that the steering tie rod at each end is connected to an exciter, and the two exciters apply axial excitation force to the steering tie rod, thereby realizing the abnormal noise detection of the steering tie rod at both ends. Although the above test method can detect the abnormal noise of the tie rods at both ends of the steering gear at one time, the transmission end of the exciter in the technical solution is directly connected to the steering tie rod. To make the vibration direction of the output end correspond to the axial direction of the tie rod, extremely high installation accuracy is required, which is often difficult to achieve in actual operation, resulting in certain defects in the excitation effect, and because the tie rods at both ends are simultaneously affected by the exciter, the superposition of the deviations of the two exciters will further reduce the accuracy of the test results. Summary of the invention

[0004] In order to solve the above problems, the present invention provides an abnormal noise test bench for a steering rod, which solves the problem in the prior art that the direction of the exciting force and the axial direction of the steering rod are prone to deviation, thereby improving the test accuracy.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: A noise test bench for a steering tie rod comprises a base, a positioning platform and a vibration excitation mechanism; the positioning platform and the vibration excitation mechanism are both fixedly connected to the upper side of the base, and the vibration excitation mechanism is arranged on the side of the base in the x-direction; the vibration excitation mechanism comprises a fixed frame, a vibration frame, a driving assembly and a plurality of elastic connecting parts, the driving assembly comprises a vibration exciter and a transmission end head which can vibrate in the x-direction under the action of the vibration exciter, the transmission end head is fixedly connected to the vibration frame, the elastic connecting part comprises a spring piece and a first connecting part and a second connecting part respectively arranged at both ends of the spring piece, the first connecting part and the second connecting part are respectively connected to the fixed frame and the vibration frame and make the spring piece perpendicular to the x-direction, the vibration frame has a mounting base surface arranged perpendicular to the x-direction, and a butt joint is fixedly connected to the mounting base surface.

[0006] It should be noted that in the present application, "the shrapnel is perpendicular to the vibration direction of the transmission end" means that the minimum thickness direction of the shrapnel is parallel to the vibration direction of the transmission end. For example, in an ideal state, the size of a shrapnel of a rectangular structure is 50mm*30mm*1mm, and the normal direction of its 50mm*30mm plane is the minimum thickness direction. When an external force is applied in this direction, the shrapnel will undergo elastic deformation in the direction of the external force. Based on the geometric structure and setting method of the shrapnel, the shrapnel mainly undergoes deformation in the x direction after being subjected to the force. In the case of a small amplitude, its deformation in the y and z directions can be ignored, and when multiple elastic connectors are centrally symmetrically arranged around the vibration frame, the deformation effects of the shrapnel in the y and z directions will offset each other, so that the vibration frame can usually only vibrate in the x direction, thereby limiting and guiding the vibration frame. Due to the limiting and guiding effects of the elastic connector, when the transmission end of the driving mechanism cannot completely vibrate in the x direction due to technical conditions, the vibration frame still maintains a relatively ideal vibration state.

[0007] In an embodiment of the present invention, a vibration excitation mechanism is provided on both sides of the positioning platform in the x-direction. During the abnormal sound test, each vibration excitation mechanism is connected to a steering rod at the end of the steering gear, and the test of two steering rods is completed in one test. In some other implementations, the number of vibration excitation mechanisms may also be one, and each abnormal sound test tests a special rod at the end of the steering gear.

[0008] Furthermore, the drive assembly also includes a transmission member, which includes a first force arm and a second force arm that are connected to each other and extend at an angle, and a hinged base is formed at the junction of the first force arm and the second force arm. The hinged base is movably hinged to the base and limited in the y direction. The first force arm extends toward the exciter and is connected to the exciter in transmission, and the second force arm extends in the z direction and forms the transmission end at the end.

[0009] When the output part of the exciter is directly connected to the vibration frame, it is necessary to ensure that the action direction of the exciter is as perpendicular to the installation base as possible, the installation accuracy of the exciter is high, and the assembly difficulty of the test bench is high. When connected through the above-mentioned transmission member, the exciter can drive the transmission member to rotate on the xz plane with the hinged base as the center after applying the exciting force to the first force arm. During the rotation, the second force arm applies the exciting force to the vibration frame to achieve the transmission effect. To ensure that the second force arm applies the exciting force in the x direction to the vibration frame, it is only necessary to satisfy that the upper end of the second force arm corresponds to the hinged base in the z upward position. The connection between the exciter and the first force arm is relatively simple, so the assembly of the test bench is easier.

[0010] Furthermore, the length of the first lever arm is greater than that of the second lever arm.

[0011] When the first force arm is greater than the second force arm, through the amplifying effect of the lever, the force exerted by the second force arm on the vibration frame is greater than the force exerted by the vibrator on the first force arm, so that the thrust requirement of the vibrator is reduced, the implementation cost is reduced, and the vibration amplitude of the second force arm will be smaller than the vibration amplitude of the first force arm. When the vibration amplitude of the vibrator is adjusted, the vibration amplitude change of the vibration frame is reduced according to a certain proportion, which is conducive to high-precision adjustment of the vibration frame.

[0012] Furthermore, the vibration frame includes a mounting frame, a mounting channel is formed in the middle of the mounting frame, and the vibration frame is arranged in the middle of the mounting frame and connected to the mounting frame through an elastic connecting piece.

[0013] Furthermore, the vibration frame includes a first mounting portion relatively close to the positioning platform and a second mounting portion relatively far away from the positioning platform, the first mounting portion and the second mounting portion are fixedly connected via an intermediate connecting portion, and the mounting base surface is formed on the second mounting portion; the fixed frame also includes a mounting frame body, the first mounting portion is connected to the mounting frame body via a plurality of elastic connecting members, and the second mounting portion is connected to the mounting frame body via a plurality of elastic connecting members.

[0014] Furthermore, the transmission end head is connected to the second mounting portion.

[0015] When the transmission end is connected to the vibration frame and an exciting force is applied to the vibration frame, elastic deformation may occur locally on the vibration frame. In particular, in order to facilitate the installation of the docking joint, the vibration frame usually sets the first mounting part as a flat plate structure perpendicular to the x-direction. The flat plate structure is prone to deformation when subjected to x-direction thrust, which in turn causes the docking joint connected to the first mounting part to tilt in direction, affecting the force stability of the steering rod. After the second mounting part and the intermediate connecting part are set and the transmission end is connected to the second mounting part, the main deformation area of ​​the vibration frame is at the location of the second mounting part. The deformation will not affect the first connecting part due to the isolation of the intermediate connecting part, thereby ensuring the morphological stability of the first connecting part.

[0016] Furthermore, the transmission end is connected to the vibration frame via a connecting rod arranged in the x direction.

[0017] Furthermore, the mounting surface is provided with a plurality of dispersed positioning holes, the docking joint comprises a mounting base and a docking portion, the mounting base is provided with docking holes corresponding to the positioning holes, and the mounting base is detachably connected to the mounting surface.

[0018] Furthermore, the docking portion includes a tie rod docking joint located at a first end and a mounting screw located at a second end, and the docking portion is provided with a mounting screw hole corresponding to the mounting screw.

[0019] Furthermore, the driving assembly also includes a buffer component, which includes a first airbag and a second airbag. The end of the first force arm forms a buffer fitting part, and the first airbag and the second airbag are respectively abutted against two sides of the vibration direction of the buffer fitting part.

[0020] In summary, the application of the present invention can achieve the following beneficial effects: 1. The present invention connects the vibration frame with the fixed frame by arranging an elastic connecting member. The spring piece of the elastic connecting member is arranged perpendicular to the x-direction. After the spring piece is subjected to the force, it mainly deforms in the x-direction. When the amplitude is small, the deformation in the y-direction and the z-direction can be ignored, so that the vibration frame usually vibrates along the x-direction under the limiting and guiding action of the elastic connecting member. Under the action of the elastic limiting member, even if the transmission end of the vibration frame is restricted by technical conditions and cannot vibrate completely along the x-direction, the vibration frame still maintains a relatively ideal vibration state, thereby ensuring the accuracy of the abnormal sound test.

[0021] 2. In the present invention, the mounting base surface of the vibration frame vibrates along the x-direction as a whole, so that the mounting position of the joint on the mounting base surface has no effect on the abnormal noise test. The mounting position of the joint can be flexibly adjusted according to the model of the steering rod to meet the testing of different types of products.

[0022] 3. In some embodiments of the present invention, the exciter is connected to the vibration frame through a transmission member. After the exciter applies an exciting force to the first force arm of the transmission member, the transmission member can be driven to rotate on the xz plane with the hinged base as the center. During the rotation, the second force arm applies an exciting force to the vibration frame to achieve a transmission effect. To ensure that the second force arm applies an exciting force in the x direction to the vibration frame, it is only necessary to ensure that the upper end of the second force arm corresponds to the hinged base in the z upward position. The connection between the exciter and the first force arm is relatively simple, so the assembly of the test bench is easier.

[0023] 4. In some embodiments of the present invention, the vibration frame is connected to the first base of the fixed frame through a first mounting portion through a plurality of elastic connectors, and the second mounting portion is connected to the second base of the fixed frame through a plurality of elastic connectors, and the limiting and guiding effects of the vibration frame are further enhanced through the two connection structures.

[0024] 5. In some embodiments of the present invention, the transmission end is connected to the second mounting portion of the vibration frame, and the vibration end applies an exciting force so that the deformation of the vibration frame is limited to the area where the second mounting portion is located, avoiding affecting the docking joint fixed on the first mounting portion, thereby ensuring the force stability of the steering rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A front view of an abnormal noise test bench in one embodiment; Figure 2 for Figure 1Front view of the middle vibration mechanism; Figure 3 for Figure 1 Side view of the middle fixed frame and the vibration frame; Figure 4 for Figure 1 Schematic diagram of the structure of the middle butt joint; Figure 5 is a front view of a vibration excitation mechanism in another embodiment; Figure 6 is a front view of a vibration excitation mechanism in another embodiment; Figure 7 is a front view of a vibration excitation mechanism in another embodiment; Figure 8 for Figure 7 Schematic diagram of the three-dimensional structure of the vibration frame; In the figure: 1-base; 2-positioning platform; 3-excitation mechanism; 31-fixed frame, 311-installation frame, 312-installation frame, 313-installation channel, 32-vibration frame, 321-installation base, 3211-positioning hole, 322-docking joint, 3221-installation base, 3222-docking part, 323-first installation part, 324-second installation part, 325-middle connecting part, 33-elastic connecting part, 331-first connecting part, 332-second connecting part, 333-spring, 33a-first elastic connecting part, 33b-second elastic connecting part, 34-exciter, 35-transmission end, 36-transmission part, 361-first force arm, 3611-buffer matching part, 362-second force arm, 363-hinge base, 37-connecting rod, 38-buffer, 381-first airbag, 382-second airbag. DETAILED DESCRIPTION

[0026] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Example

[0027] Reference Figures 1 to 4 The embodiment of the first aspect of the present invention provides an abnormal noise test bench for a steering tie rod, which includes a base 1, a positioning platform 2 and two excitation mechanisms 3, wherein the positioning platform and the excitation mechanism are connected to the top of the base, and the two excitation mechanisms are symmetrically arranged on both sides of the positioning platform in the x direction, and the excitation mechanism includes a fixing frame 31, a vibration frame 32, an elastic connecting member 33 and a driving assembly, specifically: The fixing frame 31 includes a mounting frame 311, and a mounting channel 313 is formed in the middle of the mounting frame; The vibration frame 32 has a mounting base surface 321, and the mounting base surface is provided with a plurality of positioning holes 3211 distributed in a dispersed manner. A docking joint 322 is fixedly connected to the mounting base surface, and the docking joint includes a mounting base 3221 and a docking portion 3222. The mounting base is provided with a docking hole corresponding to the positioning hole. The mounting base and the mounting base surface can be fixedly connected by passing a connecting piece through the positioning hole and the docking hole. According to the position of the steering tie rod during the abnormal sound test, the docking joint 322 can be fixed at a corresponding position of the mounting base surface to adapt to different types of steering gears and special tie rods. The two ends of the docking portion respectively form a tie rod docking joint and a mounting screw. The mounting base is provided with a mounting screw mouth corresponding to the mounting screw. The docking portion can change the position of the tie rod docking joint in the x direction by relative rotation of the mounting screw and the mounting screw mouth, so as to facilitate the connection and fixation of the tie rod docking joint with the steering tie rod; The elastic connector 33 includes a spring sheet 333 and a first connecting portion 331 and a second connecting portion 332 arranged at both ends of the spring sheet. The first connecting portion and the second connecting portion can be fixedly connected to corresponding positions of the vibration frame and the mounting frame respectively, and the spring sheet is arranged perpendicular to the x direction, that is, the thickness direction of the spring sheet is consistent with the x direction. The length and width of the spring sheet are much larger than its thickness, so that when the spring sheet is bent to a small extent, the bending direction is basically consistent with its thickness direction. In this embodiment, a plurality of elastic connectors are symmetrically arranged around the center of the vibration frame, so that the deformation effects in the y direction and the z direction offset each other. When the two ends of the elastic connector are fixed respectively, under the restriction of the elastic connector, the vibration frame can only vibrate along the x direction but cannot move along the yz plane, thereby realizing the limiting and guiding effects on the vibration frame. The driving assembly includes an exciter 34, which is arranged horizontally and has a transmission end 35 that can output an exciting force in the x-direction. The transmission end is fixedly connected to the back side of the vibration frame 32 via a connecting rod 37 arranged in the x-direction, and the connecting rod passes through the installation channel 313.

[0028] The working principle of this embodiment is as follows: the exciter applies an x-direction exciting force to the vibration frame 32 through the transmission end head 35 and the connecting rod 37. Under the limiting and guiding action of the elastic limiting member, the vibration frame drives the entire mounting base 321 to vibrate along the x-direction, so that the docking joint 322 fixed on the mounting base generates x-direction vibration. The steering rod can be tested for abnormal noise by connecting and fixing the docking joint to the steering rod. Since the motion states of various parts of the mounting base are consistent, the installation position of the docking joint will not affect the accuracy of the abnormal noise test. Therefore, the present invention can adapt to steering gears and special rods of various specifications by adjusting the installation position of the docking joint.

[0029] Figure 5A structural schematic diagram of an excitation mechanism in another embodiment of the present invention is provided. In this embodiment, the driving assembly of the excitation mechanism also includes a transmission member 36, which includes a first force arm 361 and a second force arm 362 that are connected to each other and extend at an angle, and a hinge base 363 is formed at the junction of the first force arm and the second force arm. The hinge base is movably hinged to the base and limited in the y direction, so that the transmission member can only rotate along the xz plane with the hinge base as the center. The first force arm extends toward the exciter and is connected to the exciter in transmission. The second force arm extends in the z direction and forms the transmission end 35 at the end. The transmission end is fixedly connected to the back side of the vibration frame through a connecting rod 37 arranged in the x direction.

[0030] In this embodiment, the exciter changes the excitation direction through the transmission member and indirectly drives the vibration frame. The exciter itself is arranged along the z direction and outputs the z-direction excitation force. The first force arm extends approximately along the x direction. After the first force arm receives the z-direction excitation force, the transmission member rotates and vibrates around the hinge base as the center. During the rotation, the end of the second force arm extending in the z direction vibrates in the x direction, so that the transmission end head 35 applies the x-direction excitation force to the vibration frame through the connecting rod. Compared with Figure 1 In the solution in which the middle vibrator is directly connected to the vibration frame, the installation of the vibrator in this embodiment is simpler and more feasible. In addition, when the length of the first force arm is greater than the second force arm, the thrust required by the vibrator is reduced, which is beneficial to reducing equipment costs. In addition, the amplitude change of the vibration frame is reduced by a certain proportion relative to the vibrator, which is beneficial to fine-tune the amplitude of the vibration frame.

[0031] Figure 6 FIG. 3 shows a schematic diagram of the structure of the excitation mechanism in another embodiment of the present invention. In this embodiment, the driving assembly of the excitation mechanism further includes a buffer 38, which includes a first airbag 381 and a second airbag 382. The end of the first force arm 361 is provided with a buffer matching portion 3611, which is inserted between the first airbag and the second airbag, so that the first airbag and the second airbag abut against the buffer matching portion from both sides of the vibration direction. Figure 6 For example, the first force arm vibrates in the z direction, and the first airbag and the second airbag are respectively arranged above and below the buffer matching part in the z direction.

[0032] Figure 7 and Figure 8A schematic diagram of the structure of the excitation mechanism in another embodiment of the present invention is shown. In this embodiment, the fixing frame 31 includes a mounting frame 311 relatively close to the positioning platform and a mounting frame 312 relatively far away from the positioning platform. The vibration frame 32 includes a first mounting portion 323 relatively close to the positioning platform and a second mounting portion 324 relatively far away from the positioning platform. The first mounting portion and the second mounting portion are fixedly connected by an intermediate connecting portion 325. The first mounting portion 323 is connected to the mounting frame 311 through a first elastic connecting member 33a, and the second mounting portion 324 is connected to the mounting frame 311 through a second elastic connecting member 33a. Component 33b is connected to the mounting frame body 312, and through the limiting and guiding effects of the two elastic connecting components at the front and rear, the vibration frame is further limited to vibrate in the x-direction, and in a further embodiment, the transmission end at the upper end of the second force arm is fixedly connected to the second mounting portion 324 through a connecting rod arranged in the x-direction, so that the vibration frame is subjected to force through the second mounting portion to vibrate in the x-direction. Under this scheme, even if the second mounting portion is deformed by the exciting force, the first mounting portion will not be affected by it due to the separating effect of the intermediate connecting component, thereby ensuring the directional stability of the docking joint fixedly installed on the first mounting portion.

[0033] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A noise test bench for a steering rod, characterized by: It includes a base, a positioning platform and an exciting mechanism; the positioning platform and the exciting mechanism are both fixedly connected to the upper side of the base, and the exciting mechanism is arranged on the side of the base in the x direction; the exciting mechanism includes a fixed frame, a vibration frame, a driving assembly and a plurality of elastic connecting parts, the driving assembly includes an exciter and a transmission end head which can vibrate in the x direction under the action of the exciter, the transmission end head is fixedly connected to the vibration frame, the elastic connecting part includes a spring piece and a first connecting part and a second connecting part respectively arranged at both ends of the spring piece, the first connecting part and the second connecting part are respectively connected to the fixed frame and the vibration frame and make the spring piece perpendicular to the x direction, the vibration frame has a mounting base surface arranged perpendicular to the x direction, and a docking joint is fixedly connected to the mounting base surface.

2. The abnormal noise test bench for steering tie rod according to claim 1, characterized in that: The driving assembly also includes a transmission member, which includes a first force arm and a second force arm that are connected to each other and extend at an angle, and a hinged base is formed at the junction of the first force arm and the second force arm. The hinged base is movably hinged to the base and limited in the y direction. The first force arm extends toward the exciter and is connected to the exciter in transmission, and the second force arm extends in the z direction and forms the transmission terminal at the end.

3. The abnormal noise test bench for steering tie rod according to claim 2, characterized in that: The length of the first lever arm is greater than the length of the second lever arm.

4. The abnormal noise test bench for steering tie rod according to claim 1, characterized in that: The vibration frame comprises a mounting frame, a mounting channel is formed in the middle of the mounting frame, and the vibration frame is arranged in the middle of the mounting frame and connected to the mounting frame through an elastic connecting piece.

5. The abnormal noise test bench for steering tie rod according to claim 4, characterized in that: The vibration frame includes a first mounting portion relatively close to the positioning platform and a second mounting portion relatively far away from the positioning platform, the first mounting portion and the second mounting portion are fixedly connected via an intermediate connecting portion, and the mounting base surface is formed on the second mounting portion; the fixed frame also includes a mounting frame body, the first mounting portion is connected to the mounting frame body via a plurality of elastic connecting members, and the second mounting portion is connected to the mounting frame body via a plurality of elastic connecting members.

6. The abnormal noise test bench for steering tie rod according to claim 5, characterized in that: The transmission end head is connected to the second mounting portion.

7. The abnormal noise test bench for steering tie rod according to claim 1, characterized in that: The transmission end is connected to the vibration frame through a connecting rod arranged in the x direction.

8. The abnormal noise test bench for steering tie rod according to claim 1, characterized in that: The mounting surface is provided with a plurality of dispersed positioning holes, the docking joint comprises a mounting base and a docking portion, the mounting base is provided with docking holes corresponding to the positioning holes, and the mounting base is detachably connected to the mounting surface.

9. The abnormal noise test bench for steering tie rod according to claim 1, characterized in that: The docking portion comprises a tie rod docking joint located at a first end and a mounting screw located at a second end, and the docking portion is provided with a mounting screw hole corresponding to the mounting screw.

10. The abnormal noise test bench for steering tie rod according to claim 1, characterized in that: The driving assembly further includes a buffer component, which includes a first airbag and a second airbag. The end of the first force arm forms a buffer fitting portion, and the first airbag and the second airbag are respectively abutted against two sides of the buffer fitting portion in a vibration direction.

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