CN220104285U - Test fixture - Google Patents

Abstract

The utility model relates to a test tool, and relates to the technical field of NVH (noise and harshness) test of a vehicle body. The test fixture includes test portion, a plurality of installation cantilevers, base and the connecting axle of range upon range of setting, and wherein, installation cantilever one end is equipped with first through-hole, and the arm body of installation cantilever is equipped with the second through-hole, and the shape of second through-hole is rectangular. One end of the connecting shaft penetrates through the first through holes of the plurality of mounting cantilevers and is connected with the base, and the other end of the connecting shaft is connected with the testing part. The plurality of mounting cantilevers are rotatable about the connection axis. Therefore, the rotation angle between the mounting cantilevers can be adjusted according to the positions of the mounting holes of the attachment points of the vehicle body, so that the mounting holes are covered by the second through holes, the test fixture is connected with the mounting holes of the attachment points of the vehicle body through the positions of the adjusting bolts on the second through holes, and the NVH test requirements of the mounting holes at different positions are met.

Description

Test fixture

Technical Field

The utility model relates to the field of automobile testing, in particular to the technical field of automobile body NVH testing, and particularly relates to a testing tool.

Background

The car NVH test refers to the noise, vibration and harshness (Noise, vibration, harshness) test. The NVH problem of automobiles is one of the concerns of various large-vehicle manufacturing enterprises and component enterprises. Statistics show that about 1/3 of the vehicle has a fault associated with NVH.

The car NVH test is typically performed using a test fixture. The frock is connected with the mounting hole of front overhang stand. Because the traditional two-carriage and three-carriage vehicles are changed, iterated and the like, the distances between the three mounting holes of the front suspension upright posts of different vehicle types are different, so that the on-site manufacturing tool is required after the distances between the mounting holes of the front suspension upright posts are measured, and each vehicle type corresponds to one test tool. After the test is finished, as the interval of the test part of the tool is not adjustable, the test tool corresponding to a certain vehicle type is basically in a long-term idle state, and only the mounting hole of the vehicle which is tested next time corresponds to the test tool can be started again, so that the idle and waste of resources can be caused.

Disclosure of Invention

The utility model provides a test fixture, which at least solves the technical problem that the test fixture in the related art is not adjustable. The technical scheme of the utility model is as follows:

the utility model provides a test fixture which comprises a test part, a plurality of mounting cantilevers, a base and a connecting shaft, wherein the mounting cantilevers are arranged in a stacked mode, a first through hole is formed in one end of each mounting cantilever, a second through hole is formed in an arm body of each mounting cantilever, and the second through holes are in a strip shape. One end of the connecting shaft penetrates through the first through holes of the plurality of mounting cantilevers and is connected with the base, and the other end of the connecting shaft is connected with the test part; the plurality of mounting cantilevers are rotatable about the connection axis.

According to the technical means, the plurality of mounting cantilevers rotate around the connecting shaft, and the angles among the mounting cantilevers are adjusted, so that the second through holes cover the mounting holes. The plurality of mounting cantilevers are connected with the mounting holes of the attachment points of the vehicle body through the second through holes, and then the positions of the test tools are fixed. The installation cantilever can be according to the position adjustment angle of automobile body attach point and the position of second through-hole, satisfies different motorcycle type mounted positions, and test fixture can utilize for a plurality of times like this, reduce cost.

In one possible embodiment, the mounting cantilever comprises a first portion and a second portion connected to each other, the first portion having a height smaller than a height of the second portion, the first through hole being provided in the first portion, the second through hole being provided in the second portion.

According to the technical means, the first parts of the plurality of mounting cantilevers are mutually stacked, and the height of the first parts is smaller than that of the second parts, so that the stacking height of the plurality of first parts is reduced, the height difference from the test part to the attachment point of the vehicle body is reduced, and the test data is more accurate. And the volume of the installation cantilever is reduced, so that the manufacturing material can be saved, and the cost is reduced.

In one possible embodiment, the second portions of the plurality of mounting cantilevers are the same in height, and the first portions of the plurality of mounting cantilevers are stacked in height with the second portion of any one mounting cantilever.

According to the technical means, the height of the first part of the plurality of mounting cantilevers is equal to the height of the second part of one mounting cantilever when the plurality of mounting cantilevers are stacked, and the second parts of the plurality of mounting cantilevers are located on the same plane, so that the height difference from the test part to the attachment point of the vehicle body is the same, and the accuracy of test data is further improved.

In one possible embodiment, the lengths of the plurality of mounting cantilevers are the same.

According to the technical means, the die can be used for producing and installing the cantilever, so that the cost is reduced. And the base is positioned at the center position corresponding to one ends of the plurality of installation cantilevers, the installation cantilever walls are identical in length, the position of the base is determined by the position of one end of the installation cantilever, and the base is prevented from deviating too much.

In one possible embodiment, the bottom of the test part covers the first through hole.

According to the technical means, after the position of the installation cantilever is determined, the installation cantilever is pressed on the base by the test part, so that the installation cantilever is prevented from shaking, and accurate test data can be acquired.

In one possible embodiment, the test part is provided with an extension table which extends outwardly from a lower part of the test part.

According to the technical means, the area of the test part is enlarged by the extension table, the contact area between the extension table and the installation cantilever is enlarged, the installation cantilever is further pressed on the base, the base provides a pressing force, the shaking gap of the installation cantilever is reduced, and the test data are more accurate.

In one possible embodiment, the extension table is hexagonal in shape.

According to the technical means, the tool using position is provided when the tool is convenient to install.

In one possible embodiment, the two ends of the mounting cantilever are circular arc-shaped.

According to the technical means, the arc-shaped end face can prevent the installation cantilever from rubbing the vehicle body.

In one possible embodiment, the material of the mounting cantilever is steel.

According to the technical means, the steel is not easy to deform, so that the mounting cantilever can bear larger pressure, the pressure between the test part and the base can be increased, the connection strength of the test tool is further improved, and the test tool is prevented from being scattered at each part.

Therefore, the technical characteristics of the utility model have the following beneficial effects: the rotation angle between the mounting brackets can be adjusted, and the connection position of the bolts and the mounting brackets can be adjusted according to the position of the attachment points of the vehicle body so as to correspond to the mounting holes of the attachment points. The utility model has simple structure and simple and convenient operation, and can be used for NHV tests of different vehicle types.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the utility model as claimed.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the utility model and together with the description, serve to explain the principles of the utility model and do not constitute a undue limitation on the utility model.

FIG. 1 is a block diagram of a test fixture according to an exemplary embodiment;

FIG. 2 is an exploded view of a test fixture, according to an exemplary embodiment;

FIG. 3 is a block diagram of a test fixture and a vehicle body, according to an example embodiment;

FIG. 4 is a block diagram of a mounting boom according to an exemplary embodiment;

FIG. 5 is a cross-sectional view of a mounting cantilever shown according to an exemplary embodiment.

Detailed Description

In order to enable a person skilled in the art to better understand the technical solutions of the present utility model, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings.

It should be noted that the terms "first," "second," and the like in the description and the claims of the present utility model and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the utility model described herein may be implemented in sequences other than those illustrated or otherwise described herein. The implementations described in the following exemplary examples do not represent all implementations consistent with the utility model. Rather, they are merely examples of apparatus and methods consistent with aspects of the utility model as detailed in the accompanying claims.

Fig. 1 is a block diagram of a test fixture according to an exemplary embodiment. Fig. 2 is an exploded view of a test fixture, according to an exemplary embodiment.

Referring to fig. 1 and 2, the utility model provides a test fixture, which comprises a test part 1, a plurality of mounting cantilevers 2 arranged in a stacked manner, a base 3 and a connecting shaft 4. The test section 1, the plurality of mounting cantilevers 2 and the base 3 are connected by a connecting shaft 4.

The test unit 1 is a test body, and the test unit 1 may be connected to a sensor, or the sensor may be provided on the surface of the test unit 1. During testing, the mechanical signals are collected by striking different positions of the test part 1 with a force hammer. The shape of the test part 1 may be cylindrical or polygonal, as long as a knockable position is left, and the shape of the test part 1 is not limited by the present utility model. In some examples, the bottom of the test part 1 is provided with a threaded hole for connecting the connecting shaft 4.

The mounting boom 2 is used to connect a vehicle body attachment point. One end of the mounting cantilever 2 is provided with a first through hole 21, the arm body is provided with a second through hole 22, the second through hole 22 is long-strip-shaped, and the second through hole 22 is connected with a mounting hole of a vehicle body attachment point.

The number of the mounting cantilevers 2 of the present utility model is plural, for example, two, and for example, three, and the mounting cantilevers 2 are stacked. Illustratively, with continued reference to fig. 2, the plurality of mounting cantilevers 2 includes a first mounting cantilever 2A, a second mounting cantilever 2B, and a third mounting cantilever 2C, the first mounting cantilever 2A, the second mounting cantilever 2B, and the third mounting cantilever 2C being stacked from bottom to top, the first through holes 21 of the mounting cantilevers 2 also being stacked to form a deeper hole. The present utility model is described with respect to three mounting cantilevers 2, and it is understood that other numbers of mounting cantilevers 2 are stacked from top to bottom, and the first through holes 21 are stacked to form holes.

The base 3 is used for providing the compaction force, sets up in the installation cantilever 2 below, and the shape of base 3 is the disc.

One end (e.g., lower end) of the connection shaft 4 passes through the first through holes 21 of the plurality of mounting cantilevers 2 to be connected with the base 3. Illustratively, a through hole 31 is arranged in the middle of the base 3, threads are arranged in the through hole 31, threads matched with the threads in the through hole 31 are arranged at one end, close to the base 3, of the connecting shaft 4, and the connecting shaft 4 is in threaded connection with the base 3. The other end (for example, the upper end) of the connecting shaft 4 extends into the screw hole of the test part 1 and is connected to the test part 1. That is, the connecting shaft 4 is detachably connected to the test part 1 and the base 3, respectively. Also illustratively, the upper end of the connecting shaft 4 is welded to the test portion 1, and the lower end of the connecting shaft 4 is fixedly connected to the base 3, such as by welding. It will be appreciated that the connecting shaft 4 may also be detachably connected at one end and fixedly connected at the other end.

The mounting boom 2 is rotatable about the connecting shaft 4, and illustratively, with continued reference to fig. 2, the first, second and third mounting booms 2A, 2B, 2C are each rotated about the connecting shaft 4 by an angle such that the second through-hole 22 of the mounting boom 2 covers the mounting hole of the vehicle body attachment point. The installation cantilevers 2 are movably connected with the connecting shaft 4, the installation cantilevers 2 are mutually independent, and when one installation cantilever 2 is damaged, only the damaged installation cantilever 2 needs to be replaced, so that the use cost is further reduced.

FIG. 3 is a block diagram of a test fixture and a vehicle body, according to an example embodiment.

Referring to fig. 3, the test fixture 100 is assembled when NVH testing is required. In the area surrounded by the mounting holes of the attachment points of the vehicle body 200, the test fixture 100 is placed so that the base 3 falls in the area. The mounting boom 2 is rotated to the position of the attachment point such that the mounting hole is located on the extension of the mounting boom 2. At this time, the second through holes 22 of each of the mounting cantilevers 2 cover the mounting holes, respectively, and the second through holes 22 are connected to the mounting holes by the bolts 6. The position of the bolt 6 on the second through hole 22 is moved, so that the bolt 6 is opposite to the mounting hole, the connection between the test fixture and the part to be tested is smoother, and the test fixture 100 is fixed. During testing, the test part 1 is knocked from different directions respectively, signals are collected, and the reliability of the test signals is improved.

The utility model has simple structure, the mounting cantilever 2 rotates around the connecting shaft 4 and corresponds to the mounting holes with different angles respectively, and the mounting holes are connected with the mounting cantilever 2 so as to fix the position of the test fixture. The angle of installation cantilever is adjustable, satisfies different motorcycle type mounted positions for the test fixture can cyclic utilization, reduce cost.

FIG. 4 is a block diagram illustrating a mounting cantilever according to an exemplary embodiment. FIG. 5 is a cross-sectional view of a mounting cantilever shown according to an exemplary embodiment.

In some embodiments, referring to fig. 4 and 5, the mounting cantilever 2 includes a first portion P1 and a second portion P2 connected to each other, and a height d1 of the first portion P1 is smaller than a height d2 of the second portion P2, it is understood that the first portion P1 and the second portion P2 are stepped, and a boundary L between the first portion P1 and the second portion P2 may be linear or circular arc. The first through hole 21 is provided in the first portion P1, and the second through hole 22 is provided in the second portion P2. After the plurality of mounting booms 2 are stacked, the stacking height of the plurality of first portions P1 is reduced, thereby reducing the height difference from the test portion to the vehicle body attachment point, and making the test data more accurate. And the volume of the mounting cantilever 2 is reduced, so that the manufacturing materials can be saved, and the cost is reduced.

In some embodiments, with continued reference to fig. 2 and 5, the height d2 of the second portions of the plurality of mounting booms 2 is the same, and the first portions P1 of the plurality of mounting booms 2 are stacked to be the height of any of the second portions P2. The first portions of the plurality of mounting booms 2 are offset machined. Specifically, the first portion of the first mounting cantilever 2A has a height d1a, and the lower surface of the first portion is flush with the bottom surface of the second portion. The first portion of the second mounting cantilever 2B has a height d1B, and the upper and lower surfaces of the first portion are located between the planes of the upper and lower surfaces of the second portion. The height d1C of the first portion of the third mounting cantilever 2C, the upper surface of the first portion and the top surface of the second portion are the same plane. When the three mounting cantilevers 2 are stacked, the first portion of the first mounting cantilever 2A, the first portion of the second mounting cantilever 2B, and the first portion of the third mounting cantilever 2C are stacked to have the same height as any of the second portions. At this time, the test part 1 is press-fitted to the three mounting cantilevers 2, and the height of the assembly of the mounting cantilevers 2 is as low as possible, reducing the thickness of the test fixture. The second parts of the plurality of mounting cantilevers are positioned on the same plane, so that the height difference from the test part to the attachment point of the vehicle body is the same, and the accuracy of test data is further improved.

In some embodiments, with continued reference to fig. 2, the lengths of the plurality of mounting booms 2 are the same. The three mounting cantilevers are the same length and, in some examples, the structure of the mounting cantilevers is the same. The mounting cantilevers can be produced by using one die, the cost is reduced, the lengths are the same, the base 3 is positioned at the center positions corresponding to one ends of the mounting cantilevers 2, the position of the base 3 is convenient to determine, and then the placement position of the test fixture 100 is determined.

In some embodiments, with continued reference to fig. 2, the bottom of the test portion 1 covers the first through hole 21. Specifically, the orthographic projection of the bottom of the test part 1 on the base 3 covers the orthographic projection of the first through hole 21 on the base 3. It will be appreciated that the bottom of the test part 1 may cover any of the first through holes 21, and the bottom of the test part 1 may also cover all of the first through holes 21, preventing the mounting cantilever 2 from being detached from the test part 1 via the first through holes 21. The test part 1 covers the first through hole 21, increases the contact area with the installation cantilever 2, so that the installation cantilever is pressed on the base, the installation cantilever is prevented from shaking, and accurate test data can be acquired.

In some embodiments, with continued reference to fig. 2, the test portion 1 is provided with an extension stand 5, the extension stand 5 extending outwardly from a lower portion of the test portion 1. The area of the test part 1 is enlarged by the extension table, the contact area between the extension table 5 and the installation cantilever 2 is enlarged, the installation cantilever 2 is further pressed on the base, at the moment, the base 3 provides a pressing force, the shaking gap of the installation cantilever 2 is reduced, and the test data are more accurate.

In some embodiments, the extension table 5 is hexagonal in shape, so that a tool use position is provided when the test tool is conveniently installed, and the tool is used for tightening the test part 1, and providing pressure for the test part 1 to press the base 3.

In some embodiments, the two ends of the mounting cantilever 2 are circular arc shaped. The installation cantilever can be prevented from rubbing the car body.

In some embodiments, the material of the mounting boom 2 is steel. The steel is not easy to deform, so that the mounting cantilever 2 can bear larger pressure, the pressure between the test part 1 and the base 3 can be increased, the connection strength of the test tool is further improved, and the test tool is prevented from being scattered at each part.

The utility model adopts a plurality of independent cantilever type mounting cantilevers, which can meet the size requirement of mounting points in most use scenes; the self weight of the part is reduced by installing the cantilever design while the functionality is ensured, so that the self weight which is relatively close to that of the original tool design can be kept, the material for installing the cantilever 2 is replaced by steel from the previous aluminum, and the service life of the tool is further prolonged; and when a certain part in the independent cantilever type installation cantilever is damaged, only one part needs to be replaced, so that the use cost is further reduced.

The present utility model is not limited to the above embodiments, and any changes or substitutions within the technical scope of the present utility model should be covered by the scope of the present utility model. Therefore, the protection scope of the utility model is subject to the protection scope of the claims.

Claims (9)

1. A test fixture, its characterized in that includes: a test part (1), a plurality of mounting cantilevers (2), a base (3) and a connecting shaft (4) which are arranged in a stacked manner; one end of the installation cantilever (2) is provided with a first through hole (21), the arm body of the installation cantilever (2) is provided with a second through hole (22), and the second through hole (22) is in a strip shape; one end of the connecting shaft (4) penetrates through the first through holes (21) of the plurality of mounting cantilevers and is connected with the base (3), and the other end of the connecting shaft (4) is connected with the test part (1); the plurality of mounting booms (2) are rotatable about the connection shaft (4).

2. The test fixture according to claim 1, characterized in that the mounting cantilever (2) comprises a first portion (P1) and a second portion (P2) connected to each other, the first portion (P1) having a height smaller than the second portion (P2); the first through hole (21) is formed in the first portion (P1), and the second through hole (22) is formed in the second portion (P2).

3. The test fixture according to claim 2, wherein the second portions (P2) of the plurality of mounting booms (2) are identical in height, and the first portions (P1) of the plurality of mounting booms (2) are stacked to be the height of the second portion (P2) of any one of the mounting booms (2).

4. A test fixture according to claim 1, characterized in that the lengths of a plurality of said mounting booms (2) are identical.

5. The test fixture according to claim 1, characterized in that the bottom of the test part (1) covers the first through hole (21).

6. A test fixture according to claim 1, characterized in that the test part (1) is provided with an extension table (5), the extension table (5) extending outwards from the lower part of the test part (1).

7. A test fixture according to claim 6, characterized in that the extension table (5) is hexagonal in shape.

8. The test fixture according to claim 1, characterized in that the two ends of the mounting cantilever (2) are arc-shaped.

9. A test fixture according to any one of claims 1-8, characterized in that the material of the mounting cantilever (2) is steel.