Tire load measuring device

Abstract

The utility model relates to the technical field of tire test equipment, and provides a tire load measuring device, which comprises a wheel drum, a wheel axle, a tire, a shell, an elastic body, a strain gauge, an acceleration sensor, a power supply exciter, an amplifier and a signal processor, the tire is fixedly arranged on the wheel axle, the wheel drum is arranged on one side of the tire, a gap is arranged between the wheel drum and the tire, and the shell is arranged on the shell. The elastic body is fixedly connected with the wheel shaft through the shell, the strain gauge and the acceleration sensor are arranged on the elastic body, the strain gauge is electrically connected with the power supply exciter, the amplifier and the signal processor, and the static and dynamic loading system multiplies the value obtained by the static and dynamic loading system and the value obtained by the acceleration sensor. The device can accurately reflect the force value between the tire and the rotary drum, and provides more accurate and timely load signals for closed-loop adjustment of the testing machine.

Description

Technical Field

[0001] The utility model relates to the technical field of tire test equipment, with the IPC classification number: G01M17 / 02, and particularly relates to a tire load measuring device. Background Art

[0002] The high-speed tire test is an important part of the indoor tire performance test, and the accuracy of the load borne by the tire is a very important index for the test.

[0003] In practice, the load sensor is installed behind the sliding table, and there are multiple components between it and the tire. Its load value cannot directly reflect the real force on the tire. In addition, in order to be closer to the actual use conditions of the tire, it is required that the testing machine has a high dynamic response ability, that is, it is hoped that the testing machine can reach the set load in an extremely short time. Affected by the frictional resistance of the guide rail and the inertial force of the components, the load value of the sensor behind the sliding table is different from the actual force on the tire. Without an accurate feedback value in the measurement and control system, the closed-loop adjustment process time will become longer, and thus high dynamic response cannot be achieved.

[0004] Therefore, a device that can accurately reflect the force value between the tire and the drum is needed to provide a more accurate and timely load signal for the closed-loop adjustment of the testing machine. Summary of the Utility Model

[0005] In order to solve the problem that the testing machine cannot achieve high dynamic response, the utility model provides a tire load measuring device to solve this problem.

[0006] To achieve the above purpose, the utility model provides the following technical solutions:

[0007] A tire load measuring device includes: a drum, a wheel axle, a tire, a housing, an elastomer, a strain gauge, an acceleration sensor, a power supply excitation, an amplifier, and a signal processor. The tire is fixedly installed on the wheel axle, the drum is arranged on one side of the tire, there is a gap between the drum and the tire, the elastomer is fixedly connected to the wheel axle through the housing, the strain gauge and the acceleration sensor are arranged on the elastomer, and the strain gauge is electrically connected to the power supply excitation, the amplifier, and the signal processor.

[0008] Preferably, it further includes: a static and dynamic loading system, and the value obtained by the static and dynamic loading system is multiplied by the acceleration sensor.

[0009] Preferably, the static and dynamic loading system includes: a backing plate, a standard dynamometer, and a calibration disc. The calibration disc is sleeved on the wheel axle, the backing plate is installed on one side of the drum, the standard dynamometer is installed on the backing plate, and the calibration disc is used in cooperation with the standard dynamometer.

[0010] Preferably, the elastomer includes: an upper beam, a lower beam, a two-layer plate, and an elastomer body. The upper beam, the lower beam, the two-layer plate, and the elastomer body are of an integral structure. The upper beam and the lower beam are arranged in parallel. The strain gauge is arranged on the upper beam, and the acceleration sensor is arranged on the two-layer plate.

[0011] Preferably, the elastomer body is cylindrical, and threaded holes are arranged on both sides of the elastomer body.

[0012] Preferably, the elastomer deforms under the action of a load. The strain gauge is pasted on the surface of the elastomer and generates an electrical signal due to the deformation. The electrical signal is amplified by an amplifier and superimposed by a signal processor, and finally converted into a load value by using calibration parameters.

[0013] Preferably, the installation position of the elastomer is close to the tire and there is an acceleration signal, so that a faster response output can be obtained, and thus high-frequency control of the tire loading force can be achieved.

[0014] The advantages of the present invention are as follows: In the tire load measurement device of the present invention, the elastomer of the main force-measuring structure adopts a parallel beam structure form, which is insensitive to forces and torques in other directions, avoiding the influence of the bending moment generated by the lateral force, tangential force of the tire, and rim offset on the signal. At the same time, the elastomer of the present invention is directly installed on the wheel axle without the participation of a guide rail pair, eliminating the influence of frictional resistance on the load value. In addition, an acceleration sensor is installed on the elastomer, and the inertial force generated by the mass of the tire rim is realized by multiplying the acceleration by a coefficient. The inertial force is superimposed on the basis of the force measured by the elastomer, making the measured force value of the tire more accurate. Through static and dynamic calibration, the accuracy of the load measured by the present invention can be verified. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0016] Figure 1 is a schematic structural diagram of the present invention;

[0017] Figure 2 is a schematic structural diagram of the static and dynamic loading system of the present invention;

[0018] Figure 3 is a schematic structural diagram of the elastomer of the present invention.

[0019] Description of the reference numerals:

[0020] 1. Drum; 2. Axle; 3. Tire; 4. Housing; 5. Elastomer; 6. Strain gauge; 7. Accelerometer; 8. Power supply excitation; 9. Amplifier; 10. Signal processor; 111. Pad; 112. Standard dynamometer; 113. Calibration plate; 51. Upper beam; 52. Lower beam; 53. Second-layer board; 54. Elastomer body. Detailed implementation manners

[0021] It should be noted that, without conflict, the embodiments and features in the embodiments of the present invention may be combined with each other.

[0022] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more.

[0023] In the description of the present invention, it should be noted that, unless otherwise clearly defined and limited, the terms "mounted", "connected", "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection, an electrical connection; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0024] Embodiment 1 will be described in combination with Figure 1 and Figure 3 as follows:

[0025] A tire load measuring device, comprising: a wheel drum 1, a wheel axle 2, a tire 3, a housing 4, an elastomer 5, a strain gauge 6, an acceleration sensor 7, a power supply excitation 8, an amplifier 9, and a signal processor 10. The tire 3 is fixedly mounted on the wheel axle 2. The wheel drum 1 is disposed on one side of the tire 3, and a gap is provided between the wheel drum 1 and the tire 3. The elastomer 5 is fixedly connected to the wheel axle 2 through the housing 4. The strain gauge 6 and the acceleration sensor 7 are disposed on the elastomer 5. The strain gauge 6 is electrically connected to the power supply excitation 8, the amplifier 9, and the signal processor 10.

[0026] There is a linear relationship between the deformation of the elastomer and the electrical signal of the strain gauge, and the conversion method between the signal and the load is simple. The elastomer 5 can measure the steady-state value of the tire force. At the same time, by adding the acceleration signal, the dynamic value of the tire force can be accurately measured.

[0027] The elastomer 5 deforms under the action of the load. The strain gauge 6 is pasted on the surface of the elastomer 5 and generates an electrical signal due to the deformation. The electrical signal is then amplified by the amplifier 9 and superimposed by the signal processor 10. Finally, it is converted into a load value by using the calibration parameters.

[0028] The acceleration sensor 7 is placed inside the elastomer 5 and can measure the vibration signal of the tire 3. The wave force value of the tire 3 under vibration can be calculated through the calibration coefficient.

[0029] Example 2, based on Example 1, is described in combination with Figure 2 as follows:

[0030] A tire load measuring device further comprises: a static and dynamic loading system, which multiplies the obtained value of the acceleration sensor 7.

[0031] The static and dynamic loading system comprises: a backing plate 111, a standard dynamometer 112, and a calibration disc 113. The calibration disc 113 is sleeved on the wheel axle 2. The backing plate 111 is installed on one side of the wheel drum. The standard dynamometer 112 is installed on the backing plate 111. The calibration disc 113 and the standard dynamometer 112 are used in cooperation.

[0032] Example 3, based on Example 2, is described in combination with Figure 3 as follows:

[0033] The elastomer 5 comprises: an upper beam 51, a lower beam 52, a two-layer plate 53, and an elastomer body 54. The upper beam 51, the lower beam 52, the two-layer plate 53, and the elastomer body 54 are of an integral structure. The upper beam 51 and the lower beam 52 are arranged in parallel. The strain gauge 6 is disposed on the upper beam 51. The acceleration sensor 7 is disposed on the two-layer plate 53. The structure of the elastomer 5 is a parallel beam structure, which is insensitive to the forces and torques in the non-loading direction, avoiding the influence of other factors on the measurement results.

[0034] The elastomer body 54 is cylindrical, and threaded holes are provided on both sides of the elastomer body 54.

[0035] The elastomer 5 deforms under the action of a load. The strain gauge 6 is pasted on the surface of the elastomer 5 and generates an electrical signal due to the deformation. The electrical signal is amplified by the amplifier 9 and superimposed by the signal processor 10, and finally converted into a load value by using the calibration parameters.

[0036] The installation position of the elastomer 5 is close to the tire 3, and there is an acceleration signal, so a faster response output can be obtained, and thus high-frequency control of the loading force on the tire 3 can be achieved.

[0037] The working principle of the present utility model: When the testing machine applies a load to the tire 3, the tire 3 contacts the drum 1, and the reaction force of the drum 1 on the tire 3 causes the elastomer 5 to deform. The power supply excitation 8 provides voltage for the strain gauge 6. The strain gauge 6 outputs different voltage signals according to the magnitude of the deformation of the elastomer 5, and then the signal is amplified by the amplifier 9 to obtain a voltage signal suitable for acquisition. During calibration, the loading machine applies static or dynamic loading to the wheel axle 2, and records the signals output by the amplifier 9 and the acceleration sensor 7. First, a constant load is applied to the wheel axle 2, and the standard force value of the standard force gauge 112 and the voltage signal output by the amplifier 9 are recorded. At this time, the voltage signal output by the amplifier 9 is also constant without a fluctuation value. Different magnitudes of loads are applied to the wheel axle 2 respectively, and the standard force value and the voltage signal are linearly fitted to obtain static calibration parameters. Then, high-frequency dynamic loading is applied to the wheel axle 2, and the standard force value curve of the standard force gauge 112, the voltage signal curve output by the amplifier 9, and the acceleration curve output by the acceleration sensor 7 are recorded. The voltage signal output by the amplifier 9 is multiplied by the static calibration parameters to obtain the elastomer load curve, and then the standard force value curve is subtracted from the elastomer 5 load curve to obtain the inertial force curve. Finally, the inertial force curve and the acceleration curve are linearly fitted to obtain dynamic calibration parameters. During actual use, the static calibration parameters and the dynamic calibration parameters are input into the signal processing system. In the system, the calibration parameters are multiplied by the voltage signal output by the amplifier 9 and the acceleration signal of the acceleration sensor 7 respectively, and then superimposed to obtain the final load value. The structure of the present utility model is reasonable and convenient to use, and it is a device that can accurately reflect the force value between the tire 3 and the drum 1, providing a more accurate and timely load signal for the closed-loop adjustment of the testing machine.

[0038] For those skilled in the art, the present utility model is not limited to the details of the above exemplary embodiments, and the present utility model can be implemented in other specific forms without departing from the spirit or basic characteristics of the present utility model. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present utility model. Any reference signs in the claims should not be construed as limiting the claims involved.

[0039] The above are only the preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any minor modifications, equivalent replacements, and improvements made to the above embodiments based on the technical essence of the present utility model shall be included within the protection scope of the technical solution of the present utility model.

Claims

1. A tire load measuring device, characterized in that, Comprising: A wheel drum (1), a wheel axle (2), a tire (3), a housing (4), an elastomer (5), a strain gauge (6), an acceleration sensor (7), a power supply excitation (8), an amplifier (9), and a signal processor (10). The tire (3) is fixedly mounted on the wheel axle (2). The wheel drum (1) is arranged on one side of the tire (3), and there is a gap between the wheel drum (1) and the tire (3). The elastomer (5) is fixedly connected to the wheel axle (2) through the housing (4). The strain gauge (6) and the acceleration sensor (7) are arranged on the elastomer (5). The strain gauge (6) is electrically connected to the power supply excitation (8), the amplifier (9), and the signal processor (10).

2. The tire load measuring device according to claim 1, wherein Also comprising: A static and dynamic loading system, which multiplies the obtained value of the acceleration sensor (7).

3. The tire load measuring device according to claim 2, characterized in that, The static and dynamic loading system comprises a backing plate (111), a standard dynamometer (112), and a calibration disc (113). The calibration disc (113) is sleeved on the wheel axle (2). The backing plate (111) is installed on one side of the wheel drum. The standard dynamometer (112) is installed on the backing plate (111). The calibration disc (113) is used in cooperation with the standard dynamometer (112).

4. A tire load measuring device according to claim 1, characterized in that, The elastomer (5) comprises an upper beam (51), a lower beam (52), a two-layer plate (53), and an elastomer body (54). The upper beam (51), the lower beam (52), the two-layer plate (53), and the elastomer body (54) are of an integral structure. The upper beam (51) and the lower beam (52) are arranged in parallel. The strain gauge (6) is arranged on the upper beam (51). The acceleration sensor (7) is arranged on the two-layer plate (53).

5. A tire load measuring device according to claim 4, characterized in that, The elastomer body (54) is cylindrical, and threaded holes are arranged on both sides of the elastomer body (54).

6. The tire load measuring device according to claim 1, wherein The elastomer (5) deforms under the action of a load. The strain gauge (6) is pasted on the surface of the elastomer (5) and generates an electrical signal due to the deformation. The electrical signal is amplified by the amplifier (9) and superimposed by the signal processor (10), and finally converted into a load value by using calibration parameters.

7. The tire load measuring device according to claim 1, characterized in that, The installation position of the elastomer (5) is close to the tire (3), and there is an acceleration signal, so a faster response output can be obtained, thereby enabling high-frequency control of the loading force on the tire (3).

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