CN209992191U - Load testing device for piston rod of automobile shock absorber - Google Patents
Load testing device for piston rod of automobile shock absorber Download PDFInfo
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- CN209992191U CN209992191U CN201920972297.6U CN201920972297U CN209992191U CN 209992191 U CN209992191 U CN 209992191U CN 201920972297 U CN201920972297 U CN 201920972297U CN 209992191 U CN209992191 U CN 209992191U
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- piston rod
- shock absorber
- blind hole
- testing device
- load testing
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Abstract
The utility model discloses a load testing arrangement for automobile shock absorber ware piston rod belongs to car test technical field. The load testing device comprises two strain gauges arranged on the side wall of a piston rod of the shock absorber, wherein the two strain gauges are connected to form a Wheatstone full bridge; each strain gauge comprises a longitudinal sensitive grid and a transverse sensitive grid, the longitudinal sensitive grid is parallel to the central axis of the piston rod of the shock absorber, and the transverse sensitive grid is perpendicular to the central axis of the piston rod of the shock absorber; the longitudinal sensitive grid and the transverse sensitive grid are arranged on adjacent bridge arms of the Wheatstone full bridge. The utility model discloses a will paste and locate the foil gage constitution Wheatstone full-bridge on the bumper shock absorber piston rod, obtain the dependent variable of bumper shock absorber piston rod, this dependent variable multiplies the load of bumper shock absorber piston rod and the calibration coefficient of meeting an emergency can obtain the load spectrum of bumper shock absorber piston rod.
Description
Technical Field
The utility model relates to an automotive test technical field especially relates to a load testing arrangement for automobile shock absorber piston rod.
Background
With the increasing competition of the domestic automobile industry, the challenge is faced by the need of better performance, more reliable and safer quality assurance of automobile products. The vehicle is greatly excited and impacted by the road surface in the process of running on the road surface, and the loads are transmitted to the shock absorber and are transmitted to the vehicle body suspension through the shock absorber piston rod, so that the load spectrum of the shock absorber piston rod on the real road surface is obtained, and the load spectrum is necessary for the examination of the strength and the durability of the shock absorber and the vehicle body suspension and the verification of a load decomposition model of the whole vehicle.
Therefore, a load testing device for a piston rod of a shock absorber of an automobile is needed to solve the above problems.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a load testing arrangement for automobile shock absorber ware piston rod to obtain the load spectrum of shock absorber ware piston rod, provide the reference for the intensity of automobile parts and the examination of durable life-span.
In order to realize the purpose, the following technical scheme is provided:
a load testing device for an automobile shock absorber piston rod comprises two strain gauges arranged on the side wall of the shock absorber piston rod, wherein the two strain gauges are connected to form a Wheatstone full bridge;
each strain gauge comprises a longitudinal sensitive grid and a transverse sensitive grid, the longitudinal sensitive grid is parallel to the central axis of the piston rod of the shock absorber, and the transverse sensitive grid is perpendicular to the central axis of the piston rod of the shock absorber; the longitudinal sensitive grid and the transverse sensitive grid are arranged on adjacent bridge arms of the Wheatstone full bridge.
Preferably, the piston rod of the shock absorber is of a cylindrical structure, and the two strain gauges are distributed in central symmetry relative to the central axis of the piston rod of the shock absorber.
Preferably, two mounting surfaces are arranged on the side wall of the piston rod of the shock absorber, the mounting surfaces are planes parallel to the central axis of the piston rod of the shock absorber, and each mounting surface is correspondingly attached with one strain gauge.
Preferably, the mounting surface is a rectangular surface, and the strain gauge is attached to the center of the rectangular surface.
Preferably, the length direction of the rectangular surface is perpendicular to the central axis of the piston rod of the shock absorber, and the width direction of the rectangular surface is parallel to the central axis of the piston rod of the shock absorber.
Preferably, a first blind hole is formed in the end face of the piston rod of the shock absorber, a second blind hole is formed in the side wall of the piston rod of the shock absorber, and the first blind hole is communicated with the second blind hole; and the lead-out wires of the strain gauge extend out of the piston rod of the shock absorber after sequentially passing through the first blind hole and the second blind hole.
Preferably, the central axis of the first blind hole coincides with the central axis of the piston rod of the shock absorber.
Preferably, the central axis of the second blind hole is perpendicular to the central axis of the piston rod of the shock absorber.
Preferably, a central axis of the second blind hole is perpendicular to a normal of the mounting surface.
Preferably, the first blind hole is formed in one end, connected with a vehicle body in a suspension mode, of the shock absorber piston rod.
Compared with the prior art, the beneficial effects of the utility model are that:
the utility model provides a load testing arrangement constitutes wheatstone full-bridge through pasting the foil gage of locating on the bumper shock absorber piston rod, obtains the dependent variable of bumper shock absorber piston rod, and the dependent variable multiplies the load of bumper shock absorber piston rod and the calibration coefficient that meets an emergency, can obtain the load register of automobile bumper shock absorber piston rod when true road surface goes, provides the reference for automobile parts intensity and durable life's examination.
Drawings
Fig. 1 is a front view of a piston rod of a shock absorber according to an embodiment of the present invention;
fig. 2 is a rear view of a piston rod of a shock absorber according to an embodiment of the present invention;
fig. 3 is a cross-sectional view of a piston rod of a shock absorber according to an embodiment of the present invention;
FIG. 4 is a side view of a piston rod of a shock absorber according to an embodiment of the present invention;
FIG. 5 is an elevation view of a piston rod of another shock absorber according to an embodiment of the present invention;
FIG. 6 is a rear view of another damper piston rod in accordance with an embodiment of the present invention;
FIG. 7 is a cross-sectional view of another embodiment of a piston rod for a shock absorber according to the present invention;
fig. 8 is a side view of another shock absorber piston rod in accordance with an embodiment of the present invention.
Reference numerals:
100-a damper piston rod;
1-strain gauge; 11-longitudinal sensitive grid; 12-lateral sensitive gate;
2-mounting surface; 3-a first blind hole; 4-second blind hole.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the product of the present invention is used, and are only for convenience of description of the present invention and simplification of description, but do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; either mechanically or electrically. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.
Referring to fig. 1-4, the present embodiment discloses a load testing apparatus for a piston rod 100 of an automobile shock absorber, which includes two strain gauges 1 disposed on the side walls of the piston rod 100 of the shock absorber, specifically, the strain gauges 1 are resistance type strain gauges; each strain gauge 1 comprises a longitudinal sensitive grid 11 and a transverse sensitive grid 12, and the two strain gauges 1 are connected to form a Wheatstone full bridge and then connected with data acquisition equipment through lead-out wires. The data acquisition equipment is configured to be capable of acquiring the strain amount of the strain gauge 1, and the strain amount is multiplied by the calibration coefficient of the load and the strain of the piston rod 100 of the shock absorber to obtain the load of the piston rod 100 of the shock absorber. Further, since the strain gauge 1 in this embodiment is used for measuring the strain amount generated by the shock absorber piston rod 100 under the axial load, when forming a wheatstone full bridge, it is required to ensure that the longitudinal sensitive grid 11 of the strain gauge 1 is parallel to the central axis of the shock absorber piston rod 100, the transverse sensitive grid 12 of the strain gauge 1 is perpendicular to the central axis of the shock absorber piston rod 100, and the longitudinal sensitive grid 11 and the transverse sensitive grid 12 of the strain gauge 1 are disposed on adjacent bridge arms, so as to eliminate the influence of the bending load and the torsion load of the shock absorber piston rod 100, and to facilitate obtaining the accurate strain amount of the strain gauge 1 under the axial load. Further, the piston rod 100 of the shock absorber adopts a cylindrical structure, and the two strain gauges 1 are distributed in a central symmetry manner relative to the central axis of the piston rod 100 of the shock absorber, so that the strain amount acquired by the data acquisition equipment is more accurate. According to the load testing device, the strain gauge 1 attached to the shock absorber piston rod 100 forms a Wheatstone full bridge, the strain quantity of the shock absorber piston rod 100 is obtained, and the strain quantity is multiplied by the calibration coefficient of the load and the strain of the shock absorber piston rod 100, so that the load spectrum of the shock absorber piston rod 100 when an automobile runs on a real road surface can be obtained, and reference is provided for the examination of the strength and the durability of automobile parts.
Because the side wall of the shock absorber piston rod 100 is a cylindrical surface, the strain gauge 1 inevitably bends when being attached to the side wall, so that the test precision is reduced; moreover, when the automobile runs, other parts (such as the shock absorber limiting block) of the automobile body inevitably rub and rub against the outer wall of the shock absorber piston rod 100, so that the strain gauge 1 attached to the outer wall of the shock absorber piston rod 100 is damaged, and the load test is influenced. Therefore, two mounting surfaces 2 are machined on the side walls of the shock absorber piston rod 100, and the mounting surfaces 2 are flat and parallel to the central axis of the shock absorber piston rod 100. Each mounting surface 2 is correspondingly provided with a strain gauge 1. The outer wall of the damper piston rod 100 is provided with the planar mounting surface 2, so that the strain gauge 1 can be smoothly attached to a plane, a certain yielding space is provided, other parts of an automobile are prevented from rubbing the strain gauge 1, and the service life of the strain gauge 1 is prolonged. Further, because the load of the shock absorber piston rod 100 is transmitted to the vehicle body suspension when the vehicle runs, the mounting surface 2 is arranged at one end of the shock absorber piston rod 100 connected with the vehicle body suspension, so that the finally obtained load spectrum of the shock absorber piston rod 100 has a reference value for the assessment of the vehicle body suspension strength and the endurance life.
Further, the mounting surface 2 is a rectangular surface, the central line of the rectangular surface intersects with the central axis of the damper piston rod 100, and the strain gauge 1 is attached to the center of the rectangular surface. Further, the two mounting surfaces 2 are the same in size, so that the strain amounts measured by the two strain gauges 1 are consistent. Optionally, in this embodiment, the length direction of the rectangular surface is perpendicular to the central axis of the damper piston rod 100, and the width direction of the rectangular surface is parallel to the central axis of the damper piston rod 100. In order to avoid the influence of the processing of the mounting surface 2 on the shock absorber piston rod 100 on the strength of the shock absorber piston rod 100, the size of the mounting surface 2 should be as small as possible on the premise that the whole strain gauge 1 can be attached.
Because the strain gauge 1 needs to be connected with a data acquisition unit by adopting a lead-out wire, but the parts of the automobile are various, the phenomenon that other parts of the automobile interfere with the lead-out wire can easily occur, and the load testing process is damaged. Therefore, a first blind hole 3 is formed in the end face of one end of the shock absorber piston rod 100, a second blind hole 4 is formed in the side wall between the two mounting surfaces 2 of the shock absorber piston rod 100, and the first blind hole 3 is communicated with the second blind hole 4. The lead-out wire of the strain gauge 1 can be inserted into the shock absorber piston rod 100 from the first blind hole 3, and further extends out from the second blind hole 4, and then is connected with data acquisition equipment. So set up, the lead-out wire directly stretches out by the one end of bumper shock absorber piston rod 100, avoids scattering the distribution in the periphery of bumper shock absorber piston rod 100, takes place to interfere with other spare parts of car. Optionally, the first blind hole 3 and the second blind hole 4 are cylindrical holes. Optionally, the first blind hole 3 in this embodiment is opened at one end of the shock absorber piston rod 100 connected with the vehicle body suspension, so that the length of the lead-out wire is as short as possible. Further, in order to reduce the influence of the blind holes on the strength or other mechanical properties of the body of the piston rod 100 of the shock absorber as much as possible, the central axis of the first blind hole 3 and the central axis of the piston rod 100 of the shock absorber are overlapped; secondly, the central axis of the second blind hole 4 is vertically intersected with the central axis of the shock absorber piston rod 100; referring to fig. 4, the central axis of the second blind hole 4 is perpendicular to the normal of the mounting surface 2, i.e. the second blind hole 4 is located at the middle position between the two mounting surfaces 2. Meanwhile, the opening size of the blind hole is required to be as small as possible under the condition that the lead-out wire is required to penetrate through the blind hole. For two strain gages 1 forming a wheatstone full bridge, four lead-out wires are required to be connected with a data acquisition unit, so the size of the blind hole is as small as possible on the premise that the size of the blind hole is enough to accommodate the four lead-out wires.
For the shock absorber piston rod 100, the calibration coefficients of the load and the strain of the shock absorber piston rod 100 with different materials, sizes and structures are different, so when a load spectrum is obtained by performing a load test on a real road surface on the shock absorber piston rod 100 of a certain vehicle, the calibration coefficients of the load and the strain of the shock absorber piston rod 100 need to be obtained by using a bench test. Specifically, the shock absorber piston rod 100 provided with the load testing device is erected on a rack, and a certain axial load F is output to the shock absorber piston rod 100 by using load output equipment, and the strain measured by the strain gauge 1 on the shock absorber piston rod 100 is δ, so that the ratio of the axial load F to the strain δ is the calibration coefficient of the load and the strain of the shock absorber piston rod 100. After the calibration coefficients of load and strain are obtained, the vehicle is driven on a real road surface, the data acquisition unit acquires the strain quantity of the shock absorber piston rod 100 under the impact of the load on the road surface, and the load data of the vehicle on the real road surface can be obtained by multiplying the acquired strain quantity by the calibration coefficients of the load and the strain, and a load spectrum is formed. At present, for component development, various large automobile companies use the actual load spectrum of the component to perform strength verification so as to ensure the strength, durability and the like of the product, and also ensure light weight. Therefore, almost strict requirements are provided for load input, and the accuracy of verifying the strength and durability of the parts can be ensured only when the load input is accurate. The load measuring device provided by the embodiment can accurately obtain the load spectrum of the shock absorber piston rod 100 on a real road surface, and provides accurate load value input for the verification of the suspension strength of the vehicle body. Optionally, the strength verification of the part in the early development stage mainly depends on CAE simulation analysis and bench test. Therefore, the load spectrum of the real road surface can be obtained to serve as reference for load input provided by a bench test, and also can serve as reference data for verification of a load decomposition model of the whole vehicle in CAE simulation analysis.
Taking a passenger car as an example, the specific design of the mounting surface 2 and the blind hole on the piston rod 100 of the shock absorber is described, for the passenger car, the size of the piston rod of the front shock absorber is different from that of the piston rod of the rear shock absorber, fig. 1-4 are schematic structural diagrams of the piston rod of the front shock absorber, and fig. 5-8 are schematic structural diagrams of the piston rod of the rear shock absorber. Specifically, in the present embodiment, the front shock absorber piston rod diameter is 25mm, and the rear shock absorber piston rod diameter is 18 mm. The depth of the first blind hole 3 of the front shock absorber piston rod is 43mm, and the distance from the central axis of the second blind hole 4 to the end face of the shock absorber piston rod 100 connected with the vehicle body in a suspension mode is 36 mm. The depth of the first blind hole 3 of the rear shock absorber piston rod is 56mm, and the distance from the central axis of the second blind hole 4 to the end face of the shock absorber piston rod 100 connected with the vehicle body suspension is 50 mm. The diameters of the first blind hole 3 and the second blind hole 4 are both 5 mm. Optionally, the dimensions of the two mounting faces 2 of the front shock absorber piston rod are 17mm x 12 mm. The two mounting surfaces 2 of the piston rod of the rear shock absorber have the size of 13mm multiplied by 12 mm. Alternatively, the size of the strain gauge 1 is 6mm × 4mm, and the diameter of the lead-out wire connecting the strain gauge 1 is 1 mm. Certainly, the above size design is only suitable for a certain shock absorber piston rod 100 on a passenger vehicle, and in the specific implementation, the size design of the mounting surface 2 and the blind hole can be adjusted according to the shock absorber piston rod 100 with different materials, sizes and structures, so that the mechanical performance of the shock absorber piston rod 100 is not affected as much as possible on the premise of meeting the mounting requirements of the strain gauge 1 and the lead-out wire.
It should be noted that the foregoing is only a preferred embodiment of the present invention and the technical principles applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail with reference to the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the scope of the present invention.
Claims (10)
1. A load testing device for an automobile shock absorber piston rod is characterized by comprising two strain gauges (1) arranged on the side wall of a shock absorber piston rod (100), wherein the two strain gauges (1) are connected to form a Wheatstone full bridge;
each strain gauge (1) comprises a longitudinal sensitive grid (11) and a transverse sensitive grid (12), the longitudinal sensitive grid (11) is parallel to the central axis of the shock absorber piston rod (100), and the transverse sensitive grid (12) is perpendicular to the central axis of the shock absorber piston rod (100); the longitudinal sensitive grid (11) and the transverse sensitive grid (12) are arranged on adjacent bridge arms of the Wheatstone full bridge.
2. The load testing device according to claim 1, wherein the damper piston rod (100) is of a cylindrical structure, and the two strain gauges (1) are arranged in a central symmetry manner relative to a central axis of the damper piston rod (100).
3. The load testing device according to claim 2, wherein two mounting surfaces (2) are arranged on the side wall of the shock absorber piston rod (100), the mounting surfaces (2) are planes parallel to the central axis of the shock absorber piston rod (100), and each mounting surface (2) is correspondingly attached with one strain gauge (1).
4. A load testing device according to claim 3, wherein the mounting surface (2) is a rectangular surface, and the strain gauge (1) is attached to the center of the rectangular surface.
5. The load testing device according to claim 4, wherein the length direction of the rectangular surface is perpendicular to the central axis of the damper piston rod (100), and the width direction of the rectangular surface is parallel to the central axis of the damper piston rod (100).
6. The load testing device according to claim 3, wherein a first blind hole (3) is formed in the end face of the shock absorber piston rod (100), a second blind hole (4) is formed in the side wall of the shock absorber piston rod (100), and the first blind hole (3) is communicated with the second blind hole (4); and lead-out wires of the strain gauge (1) sequentially pass through the first blind hole (3) and the second blind hole (4) and then extend out of the shock absorber piston rod (100).
7. Load testing device according to claim 6, characterized in that the centre axis of the first blind hole (3) and the centre axis of the shock absorber piston rod (100) coincide with each other.
8. Load testing device according to claim 6, characterized in that the centre axis of the second blind hole (4) perpendicularly intersects the centre axis of the shock absorber piston rod (100).
9. A load testing device according to claim 8, characterized in that the centre axis of the second blind hole (4) is perpendicular to the normal of the mounting surface (2).
10. Load testing device according to claim 6, characterized in that the first blind hole (3) opens at the end where the shock absorber piston rod (100) is connected to the vehicle body suspension.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920972297.6U CN209992191U (en) | 2019-06-26 | 2019-06-26 | Load testing device for piston rod of automobile shock absorber |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920972297.6U CN209992191U (en) | 2019-06-26 | 2019-06-26 | Load testing device for piston rod of automobile shock absorber |
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| CN209992191U true CN209992191U (en) | 2020-01-24 |
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| CN201920972297.6U Active CN209992191U (en) | 2019-06-26 | 2019-06-26 | Load testing device for piston rod of automobile shock absorber |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112525463A (en) * | 2020-11-10 | 2021-03-19 | 东风汽车集团有限公司 | Method for testing strength of support on shock absorber and shock absorber |
| CN113218680A (en) * | 2021-05-17 | 2021-08-06 | 中国第一汽车股份有限公司 | Method for testing working load of shock absorber fork of suspension system of passenger vehicle |
| CN113358464A (en) * | 2021-05-23 | 2021-09-07 | 北京工业大学 | Force measuring device under reinforced concrete slab column structure column and calibration kit |
-
2019
- 2019-06-26 CN CN201920972297.6U patent/CN209992191U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112525463A (en) * | 2020-11-10 | 2021-03-19 | 东风汽车集团有限公司 | Method for testing strength of support on shock absorber and shock absorber |
| CN113218680A (en) * | 2021-05-17 | 2021-08-06 | 中国第一汽车股份有限公司 | Method for testing working load of shock absorber fork of suspension system of passenger vehicle |
| CN113358464A (en) * | 2021-05-23 | 2021-09-07 | 北京工业大学 | Force measuring device under reinforced concrete slab column structure column and calibration kit |
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