A test bench for abnormal sound of steering tie rod

Abstract

The application provides a bench for abnormal sound test of a steering drag link, comprising a base, a positioning table and a vibration excitation mechanism; the positioning table and the vibration excitation mechanism are fixedly connected with 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 fixing frame, a vibrating frame, a driving assembly and a plurality of elastic connecting pieces; the driving assembly comprises a transmission end head capable of vibrating in the x direction; the transmission end head is fixedly connected with the vibrating frame; the elastic connecting piece comprises a spring 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 make the spring piece arranged perpendicularly to the x direction; the vibrating frame has a mounting base surface arranged perpendicularly to the x direction; and a butt joint is fixedly connected on the mounting base surface. The elastic connecting piece is arranged to limit the vibrating frame, so that the vibrating frame can only vibrate in the x direction, and the accuracy of the abnormal sound test is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of automobile detection, in particular to a abnormal sound test bench for steering tie rod. BACKGROUND

[0002] The chassis abnormal sound performance is an important symbol of the superior quality of automobile products, and directly affects the comfort and reliability of the vehicle. During the operation of the vehicle, the steering abnormal sound caused by the operation of the steering gear is an important part of the chassis abnormal sound. The steering tie rod, as one of the main components of the steering gear, is one of the objects of the chassis abnormal sound performance research.

[0003] In the prior art, the steering tie rod is located at the two ends of the steering gear. Therefore, when detecting the abnormal sound of the steering tie rod, a fixed frame is usually provided, the middle part of the steering gear is connected with the fixed frame, and a vibration exciter is arranged at each end of the fixed frame, so that each end of the steering tie rod is connected with a vibration exciter. The two vibration exciters apply axial excitation force to the steering tie rod, thereby realizing the abnormal sound detection of the two ends of the steering tie rod. Although the above test method can detect the abnormal sound of the two ends of the steering tie rod at one time, the transmission end of the vibration exciter in the technical scheme is directly connected with the steering tie rod. In order to make the vibration direction of the output end correspond to the axial direction of the steering tie rod, a very high installation precision is required, which is difficult to realize in actual operation, so that the excitation effect has certain defects. Moreover, since the two ends of the steering tie rod are simultaneously affected by the vibration exciter, the deviation of the two vibration exciters is further superimposed, which reduces the accuracy of the test results. SUMMARY

[0004] In order to solve the above problems, the present application provides a abnormal sound test bench for steering tie rod, which solves the problem that the excitation force direction is easy to deviate from the axial direction of the steering tie rod in the prior art, and improves the test precision.

[0005] In order to achieve the above purpose, the present application adopts the following technical scheme:

[0006] A abnormal sound test bench for steering tie rod, comprising a base, a positioning table and a vibration excitation mechanism; the positioning table and the vibration excitation mechanism are fixedly connected with the upper side of the base, and the vibration excitation mechanism is arranged on the side of the base in x direction; the vibration excitation mechanism comprises a fixed frame, a vibration frame, a driving assembly and a plurality of elastic connecting pieces; the driving assembly comprises a vibration exciter and a transmission end capable of vibrating in x direction under the action of the vibration exciter; the transmission end is fixedly connected with the vibration frame; the elastic connecting piece comprises a spring piece and a first connecting part and a second connecting part arranged at both ends of the spring piece respectively; the first connecting part and the second connecting part are connected with the fixed frame and the vibration frame respectively, and the spring piece is arranged perpendicular to the x direction; the vibration frame has a mounting base surface arranged perpendicular to the x direction; and a connector is fixedly connected on the mounting base surface.

[0007] It should be noted that the "elastic sheet is perpendicular to the vibration direction of the transmission end head" in the present application refers to that the minimum thickness direction of the elastic sheet is parallel to the vibration direction of the transmission end head. For example, in an ideal state, the size of the elastic sheet of a certain cuboid structure is 50mm*30mm*1mm, the normal direction of the 50mm*30mm plane is the minimum thickness direction, and when an external force is applied in this direction, the elastic sheet will elastically deform in the direction of the external force. Based on the geometric structure and setting mode of the elastic sheet, the elastic sheet mainly deforms in the x direction after being subjected to the force, and in the case of small amplitude, the deformation in the y direction and the z direction can be ignored. When a plurality of elastic connecting pieces are symmetrically arranged around the vibration frame, the deformation of the elastic sheet in the y direction and the z direction will cancel each other out, so that the vibration frame can only vibrate in the x direction, thereby playing a limiting and guiding role on the vibration frame. Due to the limiting and guiding effect of the elastic connecting piece, when the transmission end head of the driving mechanism is limited by technical conditions and cannot vibrate completely in the x direction, the vibration frame still maintains a relatively ideal vibration state.

[0008] In the embodiment of the present application, one vibration excitation mechanism is arranged on each side of the positioning table in the x direction, and each vibration excitation mechanism is connected with a steering drag link at the end of the steering gear during the abnormal sound test. The test of two steering drag links is completed in one test. In some other embodiments, the number of vibration excitation mechanisms can be one, and each abnormal sound test is performed on a special drag link at the end of the steering gear.

[0009] Further, the driving assembly further comprises a transmission member, the transmission member comprises a first force arm and a second force arm connected with each other and extending at an included angle, a hinged base is formed at the joint of the first force arm and the second force arm, the hinged base is movably hinged with the base and limited in the y direction, the first force arm extends towards the vibration exciter and is in transmission connection with the vibration exciter, and the second force arm extends in the z direction and forms the transmission end head at the end.

[0010] When the output part of the vibration exciter is directly connected with the vibration frame, it is necessary to ensure that the action direction of the vibration exciter is perpendicular to the mounting base as much as possible, and the mounting precision of the vibration exciter is high, and the assembly difficulty of the test bench is high. When the transmission member is connected, the vibration exciter can drive the transmission member to rotate in the x-z plane with the hinged base as the center after the vibration exciter applies a vibration excitation force to the first force arm. In the process of rotation, the second force arm applies a vibration excitation force to the vibration frame, and the transmission effect is realized. In order to ensure that the second force arm applies an x direction vibration excitation force to the vibration frame, it is only necessary to ensure that the upper end of the second force arm corresponds to the position of the hinged base in the z direction. The connection between the vibration exciter and the first force arm is simple, and therefore the assembly of the test bench is easier.

[0011] Further, the length of the first force arm is greater than that of the second force arm.

[0012] When the first force arm is greater than the second force arm, the second force arm has a greater effect on the vibration frame than the first force arm through the amplification of the lever, so that the thrust requirement of the exciter is reduced, the implementation cost is reduced, and the vibration amplitude of the second force arm is smaller than the vibration amplitude of the first force arm. When the vibration amplitude of the exciter is adjusted, the vibration amplitude of the vibration frame changes in proportion to the vibration amplitude of the exciter, which is beneficial to the high-precision adjustment of the vibration frame.

[0013] Further, the vibration frame includes a mounting frame body, and a mounting channel is formed in the middle of the mounting frame body. The vibration frame is arranged in the middle of the mounting frame body and connected to the mounting frame body through elastic connecting members.

[0014] Further, the vibration frame includes a first mounting portion close to the positioning table and a second mounting portion away from the positioning table. The first mounting portion and the second mounting portion are fixedly connected through an intermediate connecting portion, and the mounting base surface is formed on the second mounting portion. The fixed frame further includes a mounting frame body. The first mounting portion is connected to the mounting frame body through a plurality of elastic connecting members, and the second mounting portion is connected to the mounting frame body through a plurality of elastic connecting members.

[0015] Further, the transmission end is connected to the second mounting portion.

[0016] When the transmission end is connected to the vibration frame and exerts an excitation force on the vibration frame, local elastic deformation of the vibration frame may occur, especially when the first mounting portion is arranged as a flat structure perpendicular to the x direction to facilitate the installation of the adapter. When the flat structure is subjected to an x-direction thrust, it is prone to deformation, which may cause the adapter connected to the first mounting portion to tilt in a certain direction, affecting the stress stability of the steering pull rod. After the second mounting portion and the intermediate connecting portion are arranged and the transmission end is connected to the second mounting portion, the main deformation area of the vibration frame is located at the position of the second mounting portion. The deformation is isolated by the intermediate connecting portion and does not affect the first connecting portion, thereby ensuring the stability of the first connecting portion.

[0017] Further, the transmission end is connected to the vibration frame through an x-direction connecting rod.

[0018] Further, the mounting surface is provided with a plurality of positioning holes distributed in a scattered manner. The adapter includes a mounting base and an adapter portion. The mounting base is provided with an adapter hole corresponding to the positioning hole, and the mounting base is detachably connected to the mounting surface.

[0019] Further, the adapter portion includes a pull rod adapter at a first end and a mounting screw at a second end. The adapter portion is provided with a mounting screw port corresponding to the mounting screw.

[0020] Further, the driving assembly further comprises a buffer member, the buffer member comprises a first air bag and a second air bag, an end of the first force arm forms a buffer fitting part, and the first air bag and the second air bag are respectively in abutment with both sides of the buffer fitting part in a vibration direction.

[0021] In summary, the application has the following advantages:

[0022] 1、The elastic connecting piece is arranged to connect the vibration frame and the fixed frame, the elastic sheet of the elastic connecting piece is arranged perpendicularly to the x direction, the elastic sheet mainly deforms in the x direction after being subjected to the force, and the deformation in the y direction and the z direction can be ignored in the case that the amplitude is small, so that the vibration frame generally vibrates in the x direction under the limiting and guiding actions of the elastic connecting piece, and even if the transmission end head of the vibration frame cannot completely vibrate in the x direction due to the technical conditions, the vibration frame still maintains a relatively ideal vibration state under the action of the elastic limiting piece, and the accuracy of the abnormal sound test is ensured.

[0023] 2、In the application, the mounting base surface of the vibration frame vibrates in the x direction as a whole, so that the installation position of the adapter on the mounting base surface does not affect the abnormal sound test, and the adapter can be flexibly adjusted in the installation position according to the type of the steering drag link to meet the test of different types of products.

[0024] 3、In some embodiments of the application, the exciter is connected with the vibration frame through the transmission member, the exciter can drive the transmission member to rotate in the x-z plane with the hinged base as the center after the exciter applies the exciting force to the first force arm of the transmission member, the second force arm applies the exciting force to the vibration frame in the process of rotation, the transmission effect is realized, the position of the upper end of the second force arm corresponds to the position of the hinged base in the z direction, so that the second force arm can apply the x direction exciting force to the vibration frame, the connection between the exciter and the first force arm is relatively simple, and therefore, the assembly of the test bench is easier.

[0025] 4、In some embodiments of the application, the vibration frame is connected with the first base of the fixed frame through the first mounting part through a plurality of elastic connecting pieces, and the second mounting part is connected with the second base of the fixed frame through a plurality of elastic connecting pieces, and the limiting and guiding actions on the vibration frame are further strengthened through the two connection structures.

[0026] 5、In some embodiments of the application, the transmission end head is connected with the second mounting part of the vibration frame, the deformation of the vibration frame caused by the exciting force applied by the vibration end head is limited in the area where the second mounting part is located, the adapter fixed on the first mounting part is avoided from being affected, and the stress stability of the steering drag link is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 It is a front view of the abnormal sound test bench in an embodiment;

[0028] Figure 2 Fig. 1 is a perspective view of a vibration mechanism in an embodiment of the present application; Figure 1 Fig. 2 is a front view of the vibration mechanism in the embodiment of the present application;

[0029] Figure 3 Fig. 3 is a side view of a fixed frame and a vibrating frame in the embodiment of the present application; Figure 1 Fig. 4 is a side view of the fixed frame and the vibrating frame in the embodiment of the present application;

[0030] Figure 4 Fig. 5 is a structural schematic view of a joint in the embodiment of the present application; Figure 1 Fig. 6 is a structural schematic view of the joint in the embodiment of the present application;

[0031] Figure 5 Fig. 7 is a front view of a vibration mechanism in another embodiment of the present application;

[0032] Figure 6 Fig. 8 is a front view of the vibration mechanism in another embodiment of the present application;

[0033] Figure 7 Fig. 9 is a front view of the vibration mechanism in another embodiment of the present application;

[0034] Figure 8 Fig. 10 is a perspective structural schematic view of a vibrating frame in the embodiment of the present application; Figure 7 Fig. 11 is a perspective structural schematic view of the vibrating frame in the embodiment of the present application;

[0035] Fig. 12 is a structural schematic view of a joint in the embodiment of the present application;

[0036] 1 - base; 2 - positioning table; 3 - vibration mechanism; 31 - fixed frame, 311 - mounting frame body, 312 - mounting frame body, 313 - mounting channel, 32 - vibrating frame, 321 - mounting base surface, 3211 - positioning hole, 322 - joint, 3221 - mounting base, 3222 - joint part, 323 - first mounting part, 324 - second mounting part, 325 - intermediate connecting part, 33 - elastic connecting piece, 331 - first connecting part, 332 - second connecting part, 333 - elastic sheet, 33a - first elastic connecting piece, 33b - second elastic connecting piece, 34 - vibrator, 35 - transmission end, 36 - transmission piece, 361 - first force arm, 3611 - buffer matching part, 362 - second force arm, 363 - hinged base, 37 - connecting rod, 38 - buffer piece, 381 - first air bag, 382 - second air bag. DETAILED DESCRIPTION

[0037] The technical solutions of the present application will be described clearly and completely below in conjunction with the embodiments. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application. EMBODIMENT

[0038] Referring to Figures 1-4The embodiment of the first aspect of the application provides an abnormal sound test bench for a steering pull rod, which comprises a base 1, a positioning table 2 and two vibration exciting mechanisms 3, the positioning table and the vibration exciting mechanisms are connected above the base, the two vibration exciting mechanisms are symmetrically arranged on the two sides of the positioning table in the x direction, the vibration exciting mechanism comprises a fixing frame 31, a vibrating frame 32, an elastic connecting piece 33 and a driving assembly, and specifically:

[0039] The fixing frame 31 comprises an installation frame body 311, and a mounting channel 313 is formed in the middle of the installation frame body;

[0040] The vibrating frame 32 has an installation base surface 321, the installation base surface is provided with a plurality of positioning holes 3211 which are distributed in a scattered manner, and a butt joint 322 is fixedly connected to the installation base surface, the butt joint comprises an installation base 3221 and a butt portion 3222, the installation base is provided with a butt hole corresponding to the positioning hole, the installation base and the installation base surface can be fixedly connected by penetrating the connecting piece through the positioning hole and the butt hole, according to the position of the steering pull rod in the abnormal sound test process, the butt joint 322 can be fixed at the corresponding position of the installation base surface, so as to adapt to different models of the steering gear and special pull rods, the two ends of the butt portion are formed into a pull rod butt joint and an installation screw rod respectively, the installation base is provided with an installation screw hole corresponding to the installation screw rod, and the butt portion can change the position of the pull rod butt joint in the x direction through relative rotation of the installation screw rod and the installation screw hole, so as to facilitate connection and fixation of the pull rod butt joint and the steering pull rod.

[0041] The elastic connecting piece 33 comprises a spring piece 333 and a first connecting portion 331 and a second connecting portion 332 arranged at the two ends of the spring piece, the first connecting portion and the second connecting portion can be fixedly connected to corresponding positions of the vibrating frame and the installation frame respectively, and the spring piece is arranged perpendicular to the x direction, that is, the thickness direction of the spring piece is consistent with the x direction, the length and the width of the spring piece are much larger than the thickness, so that when the spring piece is bent with a small amplitude, the bending direction is basically consistent with the thickness direction, and in the embodiment, a plurality of elastic connecting pieces are symmetrically arranged around the center of the vibrating frame, so that the deformation actions in the y direction and the z direction are offset to each other, when the two ends of the elastic connecting piece are fixed, the vibrating frame can only vibrate in the x direction and cannot move in the y-z plane under the limitation of the elastic connecting piece, so that the limiting and guiding effects on the vibrating frame are achieved.

[0042] The driving assembly comprises a vibration exciter 34, the vibration exciter is arranged transversely and has a transmission end head 35 which can output an x-direction exciting force, the transmission end head is fixedly connected to the back side of the vibrating frame 32 through a connecting rod 37 arranged in the x direction, and the connecting rod penetrates through the mounting channel 313.

[0043] The working principle of the embodiment is as follows: the exciter applies an x-direction excitation force to the vibration frame 32 through the transmission end head 35 and the connecting rod 37, and under the limiting and guiding of the elastic limit members, the vibration frame drives the entire installation base surface 321 to vibrate in the x direction, so that the butt joint 322 fixed on the installation base surface vibrates in the x direction, and the abnormal sound test of the steering drag link can be performed after the butt joint is connected and fixed with the steering drag link. Since the movement states of each part of the installation base surface are consistent, the installation position of the butt joint does not affect the accuracy of the abnormal sound test, so the present application can adapt to steering gears and special drag links of various specifications by adjusting the installation position of the butt joint.

[0044] Figure 5 A structural schematic diagram of an excitation mechanism in another embodiment of the present application is provided, and in the embodiment, the drive assembly of the excitation mechanism further comprises a transmission member 36, the transmission member comprises a first force arm 361 and a second force arm 362 connected with each other and extending at an included angle, a hinged base 363 is formed at the joint of the first force arm and the second force arm, the hinged base is movably hinged with the base and is limited in the y direction, so that the transmission member can only rotate in the x-z plane with the hinged base as the center, the first force arm extends towards the exciter and is in transmission connection with the exciter, the second force arm extends in the z direction and forms the transmission end head 35 at the end, and the transmission end head is fixedly connected with the back side of the vibration frame through the connecting rod 37 arranged in the x direction.

[0045] In the embodiment, the exciter changes the excitation direction through the transmission member and indirectly drives the vibration frame, the exciter is arranged in the z direction and outputs a z-direction excitation force, the first force arm extends substantially in the x direction, and after receiving the z-direction excitation force, the transmission member rotates and vibrates with the hinged 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 an x-direction excitation force to the vibration frame through the connecting rod. Compared with the scheme in which the exciter is directly connected with the vibration frame in the prior art, the installation of the exciter in the embodiment is simpler and more implementable, and when the length of the first force arm is greater than that of the second force arm, the required thrust of the exciter is reduced, which is conducive to reducing the cost of the equipment, and the amplitude change of the vibration frame is reduced by a certain proportion relative to the exciter, which is conducive to fine adjustment of the amplitude of the vibration frame. Figure 1

[0046] Figure 6 A structural schematic diagram of an excitation mechanism in another embodiment of the present application is provided, and in the embodiment, the drive assembly of the excitation mechanism further comprises a transmission member 36, the transmission member comprises a first force arm 361 and a second force arm 362 connected with each other and extending at an included angle, a hinged base 363 is formed at the joint of the first force arm and the second force arm, the hinged base is movably hinged with the base and is limited in the y direction, so that the transmission member can only rotate in the x-z plane with the hinged base as the center, the first force arm extends towards the exciter and is in transmission connection with the exciter, the second force arm extends in the z direction and forms the transmission end head 35 at the end, and the transmission end head is fixedly connected with the back side of the vibration frame through the connecting rod 37 arranged in the x direction. Figure 6 ​For example, the first force arm vibrates in the z direction, and the first air bag and the second air bag are arranged above and below the buffering cooperation part in the z direction.

[0047] Figure 7 And Figure 8 The structure of the vibration excitation mechanism in another embodiment of the present application is shown. In this embodiment, the fixed frame 31 includes a mounting frame body 311 close to the positioning table and a mounting frame body 312 far from the positioning table, the vibration frame 32 includes a first mounting part 323 close to the positioning table and a second mounting part 324 far from the positioning table, the first mounting part and the second mounting part are fixedly connected through an intermediate connecting part 325, the first mounting part 323 is connected with the mounting frame body 311 through a first elastic connecting part 33a, the second mounting part 324 is connected with the mounting frame body 312 through a second elastic connecting part 33b, through the limiting and guiding effects of the front and rear elastic connecting parts, the vibration frame is further limited to vibrate in the x direction, and in a further embodiment, the transmission end of the upper end of the second force arm is fixedly connected with the second mounting part 324 through an x-direction connecting rod, so that the vibration frame is forced to vibrate in the x direction through the second mounting part, and in this scheme, even if the second mounting part is deformed by the excitation force, because of the separation effect of the intermediate connecting part, the first mounting part will not be affected, thereby ensuring the stability of the orientation of the docking head fixedly installed on the first mounting part.

[0048] Finally, it should be noted that: the above only for the preferred embodiments of the present application, and not for limiting the present application, although the present application has been described in detail with reference to the foregoing embodiments, for those skilled in the art, it still can modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features, any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application, should be included in the protection scope of the present application.

Claims

1. A squeak test bench for a steering tie rod, characterized by: The utility model provides a kind of vibration excitation mechanism, including base, positioning platform and vibration excitation mechanism;The positioning platform and vibration excitation mechanism are fixedly connected with the upper side of base, and vibration excitation mechanism is arranged in the side of base x direction;The vibration excitation mechanism includes fixed frame, vibration frame, drive assembly and several elastic connecting pieces, and the drive assembly includes vibration exciter and the transmission end head that is acted by vibration exciter, the transmission end head is fixedly connected with the vibration frame, and the elastic connecting piece includes elastic sheet and the first connecting part and the second connecting part respectively arranged in the both ends of elastic sheet, the first connecting part and the second connecting part are connected with fixed frame and vibration frame respectively and make the elastic sheet be arranged perpendicularly to x direction, and the vibration frame has installation base surface arranged perpendicularly to x direction, and the installation base surface is fixedly connected with butt joint;The drive assembly further includes transmission member, and the transmission member includes first force arm and second force arm connected with each other and extending at an angle, and the first force arm and the second force arm form hinged base at the joint, the hinged base is movably hinged with base and is limited in y direction, the first force arm extends to the direction of vibration exciter and is transmissionally connected with vibration exciter, and the second force arm extends in z direction and forms the transmission end head at end portion;The vibration frame includes installation frame body, and installation channel is formed in the middle of installation frame body, and the vibration frame is arranged in the middle of installation frame body and is connected with installation frame body by elastic connecting piece;The vibration frame includes first installation part relatively close to positioning platform and second installation part relatively far away from positioning platform, and the first installation part and the second installation part are fixedly connected by intermediate connecting part, and the installation base surface is formed in the second installation part;The fixed frame further includes installation frame body, and the first installation part is connected with installation frame body by several elastic connecting pieces, and the second installation part is connected with installation frame body by several elastic connecting pieces.

2. A squeak test bench for a tie rod as defined in claim 1, characterized in that: The length of the first force arm is greater than that of the second force arm.

3. A squeak test bench for a tie rod as defined in claim 1, characterized in that: The transmission end head is connected with the second installation part.

4. The squeak test bench for a tie rod as set forth in claim 1, wherein: The transmission end head is connected with the vibration frame by a connection rod arranged in x direction.

5. A noise test bench for steering tie rods according to claim 1, characterized in that: The installation base surface is provided with a plurality of positioning holes distributed in a scattered manner, the butt joint includes a mounting base and a butt portion, the mounting base is provided with a butt hole corresponding to the positioning hole, and the mounting base is detachably connected with the installation base surface.

6. A noise test bench for steering tie rods according to claim 1, characterized in that: The butt portion includes a pull rod butt joint at a first end and a mounting screw at a second end, and the butt portion is provided with a mounting screw port corresponding to the mounting screw.

7. A noise test bench for steering tie rods according to claim 1, characterized in that: The drive assembly further includes a buffer member, the buffer member includes a first air bag and a second air bag, an end portion of the first force arm forms a buffer fitting portion, and the first air bag and the second air bag are respectively abutted with both sides of the vibration direction of the buffer fitting portion.

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