Bearing roller with load measurement and bearing system

Abstract

The application relates to a bearing roller with load measurement and a bearing system, and belongs to the technical field of bearing roller load measurement. The roller comprises a through hole formed in an axle center, strain gauges are arranged on the inner wall circumferential surface of the through hole at four positions opposite to each other, each strain gauge is connected in series on a bridge arm to form an electric bridge, one end of a signal input end is arranged between the bridge arms of a pair of circumferentially adjacent two strain gauges, the other end of the signal input end is arranged between the bridge arms of another pair of circumferentially adjacent two strain gauges, and the two ends of a signal output end are respectively arranged between the two bridge arms of the remaining two groups of strain gauges which are not provided with the signal input end. The application solves the problems of large machining difficulty caused by the need of setting reference strain gauges in stress detection, and makes the bearing load detection more reliable, accurate and persistent.

Description

TECHNICAL FIELD

[0001] The application relates to a bearing roller with load measurement and a bearing system, and belongs to the technical field of bearing roller load measurement. BACKGROUND

[0002] In a bearing operated under large load and complex working conditions such as a wind power bearing, the internal roller is a core force supporting component. Direct detection and transmission of the force, temperature and attitude change of the roller have obvious guiding significance for designers to improve the bearing design and early warn possible bearing failure in the field.

[0003] A rolling element with a sensor for use in a rolling bearing is disclosed in the Chinese patent application file with the application publication number CN113039419A. The scheme sets two opposite measurement contacts on the hole wall of the bearing rolling element. The two measurement contacts are in mechanical contact with the hole wall, and a gap is formed between the measurement contacts. The size of the gap is determined by generating eddy current in the measurement contacts, and then the deformation of the rolling element is obtained according to the change of the size of the gap. Thus, the force or load of the roller can be obtained according to the deformation. However, the measurement circuit of the scheme is complex, and the generation of eddy current brings a large load, which requires a higher power supply and an additional energy storage. The relatively complex circuit board and measurement contacts need to be set in the hole of the roller, which requires high machining precision and is difficult to manufacture, resulting in high cost. Moreover, the scheme is prone to failure, which reduces the reliability. SUMMARY

[0004] The application aims to provide a bearing roller with load measurement and a bearing system to solve the problems of high cost, complex structure and difficult manufacturing of the existing bearing rolling element with load detection.

[0005] To achieve the above-mentioned purpose, the scheme of the application includes:

[0006] The first technical scheme of the bearing roller with load measurement of the application includes a through hole formed in the shaft center, strain gauges are arranged at four positions opposite to each other on the inner wall circumferential surface of the through hole, each strain gauge is connected in series with a bridge arm to form an electric bridge, one end of a signal input end is arranged between the bridge arms of a pair of circumferentially adjacent strain gauges, the other end of the signal input end is arranged between the bridge arms of another pair of circumferentially adjacent strain gauges, and the two ends of a signal output end are respectively arranged between the two bridge arms which are not provided with the signal input end.

[0007] The application utilizes strain gauges to collect the load of bearing rollers through the slight deformation under roller stress, and the deformation generated in the actual working process of the bearing is very small and difficult to be detected by traditional deformation measurement methods. The strain gauges are arranged at four equally divided positions on the circumferential surface of the bearing roller shaft hole, i.e. the strain gauges are arranged at positions every 90 degrees on the circumferential surface of the roller shaft hole, and the positions of the strain gauges are opposite to each other. In this way, in combination with the characteristics of the planetary motion of the roller between the inner and outer rings of the bearing, the radial directions of the two groups of opposite strain gauges coincide with the directions of supporting the inner and outer rings of the roller periodically, i.e. the same as the load stress direction. Since the roller with a hollow shaft is approximately annular in the radial direction, the resistance of the strain gauges in the same direction as the load direction is increased at this time. The resistances of the two groups of opposite strain gauges change alternately in the load direction. Furthermore, the four strain gauges arranged at the four positions are used as four bridge arms of an electric bridge, and the strain gauges in the same group are arranged on opposite bridge arms of the electric bridge. The change amounts of the strain gauges in the same direction are superimposed on each other, and the superimposed results in the opposite directions are further superimposed and subtracted, so that the resistance change caused by the deformation is further amplified, the deformation amount is further amplified, and the measurement result is more accurate. In addition, the resistance increase and decrease of the two groups of strain gauges are also periodically changed due to the periodic rotation of the roller, so that the output of the electric bridge also presents periodic changes with two continuous peaks. Therefore, the stress detection based on the strain gauges also does not need to set a reference strain gauge, and the output with periodic changes caused by the motion characteristics of the roller makes the two groups of strain gauges serve as the reference to each other, so that the load measurement based on the stress is realized, and the experimental data proves that the measurement result is accurate without the reference strain gauge.

[0008] The strain gauges arranged at the same position can be a plurality of strain gauges connected in series with each other, and the plurality of strain gauges arranged at the same position are connected in series on the same bridge arm of the electric bridge.

[0009] The strain gauges arranged at the four positions on the circumferential surface of the inner hole of the roller are easy to be pasted and arranged, the machining methods of the four positions are the same, the machining difficulty is reduced, and the four strain gauges serve as the reference to each other, so that the roller load detection of the application is more reliable, accurate and durable.

[0010] Further, the four strain gauges on the inner wall circumferential surface of the through hole are spaced 90 degrees apart in the circumferential direction.

[0011] The directions of the two groups of opposite strain gauges are perpendicular to each other, when the direction of one group of strain gauges is the same as the load direction, the direction of the other group of strain gauges is perpendicular to the load direction, the deformation strain on the arc surface is reduced, and the resistance is reduced. When the resistance of one group of strain gauges is the largest, the resistance of the other group of strain gauges is the smallest, the difference is maximized to ensure that the output amplitude of the electric bridge is the largest, and the detection accuracy is improved.

[0012] Further, in order to make the stress detection under the roller load more accurate and uniform, the four strain gauges are located on the circumferential wall of the through hole at the middle position of the inner wall, i.e. on the vertical section at the middle position of the roller axis.

[0013] The intelligent roller can measure at least one group of loads in the vertical section direction of the roller axis. In the case of measuring one group of loads, the measurement position is located on the circumferential wall of the through hole at the central position of the roller. Further, in the case of measuring two groups of loads, the two measurement positions are respectively located on the circumferential wall of the through hole at the position of 1 / 3 of the axis length from the end face. In the case of measuring three groups of loads, one group is located on the circumferential wall of the through hole at the central position, and one group is located on the circumferential wall of the through hole at the position close to each end face.

[0014] Further, the through hole is also provided with a temperature sensor and a posture sensor.

[0015] The roller with stress detection of the application can also detect the roller temperature and the current rotating posture at the same time, provide information cooperating with the load, improve the intelligent degree of the roller, and is more conducive to the research and monitoring of the working condition and the stable operation of the roller.

[0016] Further, the ratio of the diameter of the through hole to the diameter of the corresponding roller is less than 29%.

[0017] It is found through research that, in the case that the ratio of the diameter of the hollow of the roller axis to the diameter of the roller is less than 29%, the deformation of the hollow roller under the same pressure load as the solid roller does not exceed 1%, which does not affect the mixed use of the measured roller and other normal rollers, and the load condition of the roller can be normally reflected.

[0018] The technical scheme of the bearing roller with load measurement of the application is that strain gauges are arranged at any three positions of the four positions opposite to each other on the circumferential surface of the inner wall of the through hole, the strain gauges at the three positions and a resistor are respectively connected in series on the four first-and-last connected bridge arms of the electric bridge, one end of the signal input end is arranged between the bridge arms of the two positions adjacent to each other in the circumferential direction, the other end of the signal input end is arranged between the bridge arm of the strain gauge at the third position and the bridge arm of the resistor, and the two ends of the signal output end are respectively arranged between the two bridge arms which are not provided with the signal input end.

[0019] Further, the four positions on the circumferential surface of the inner wall of the through hole are respectively spaced by 90 degrees in the circumferential direction.

[0020] The bearing roller of the application can also cancel one strain gauge and only set three strain gauges on the basis of the first technical solution, replace the corresponding bridge arms on the electric bridge with fixed resistors of the same resistance level as the strain gauges, and achieve the same direction change of the resistance values of two strain gauges and the opposite direction change of the resistance value of the remaining strain gauge, so that the periodic change waveform is output through the electric bridge, and the measurement of the roller load is realized.

[0021] The bridge arms provided with resistors can be a plurality of resistors connected in series and in parallel with each other.

[0022] The technical solution of the bearing roller with load measurement of the application sets strain gauges at any two of the four positions opposite to each other on the circumferential surface of the inner wall of the through hole, and the strain gauges at the two positions and two groups of resistors are respectively connected in series on the four first and last connected bridge arms of the electric bridge.

[0023] If the two strain gauges are respectively arranged at the two opposite positions, one end of the signal input end is arranged between the bridge arm where the strain gauge is located and the bridge arm where one group of resistors is located, and the other end of the signal input end is arranged between the bridge arm where the other strain gauge is located and the bridge arm where the other group of resistors is located; the two ends of the signal output end are respectively arranged between the two bridge arms where the signal input end is not arranged.

[0024] If the two strain gauges are respectively arranged at the two adjacent positions, one end of the signal input end is arranged between the bridge arm where the strain gauges at the two adjacent positions are located and the bridge arm where one resistor is located, and the other end of the signal input end is arranged between the bridge arm where the other group of strain gauges is located and the bridge arm where the other resistor is located; the two ends of the signal output end are respectively arranged between the two bridge arms where the signal input end is not arranged.

[0025] Further, the four positions on the circumferential surface of the inner wall of the through hole are respectively spaced 90 degrees in the circumferential direction.

[0026] The bearing roller of the application can also cancel two strain gauges and only set two strain gauges on the basis of the first technical solution, and replace the corresponding two bridge arms on the electric bridge with fixed resistors of the same resistance level as the strain gauges.

[0027] When the two strain gauges are at opposite positions, the resistance value change conditions of the two strain gauges are the same, the resistance value changes of the strain gauges are superimposed through the electric bridge, the strain of the roller under load is amplified, and the periodic change waveform is output through the electric bridge, so that the measurement of the roller load is realized.

[0028] When the two strain gauges are at positions adjacent to each other by 90 degrees, the resistance value change conditions of the two strain gauges are opposite, the resistance value changes of the strain gauges on the corresponding bridge arms can still be superimposed through the electric bridge, the strain of the roller under load is amplified, and the periodic change waveform is output through the electric bridge, so that the measurement of the roller load is realized.

[0029] The same direction change of the resistance of the two strain gauges and the opposite direction change of the remaining strain gauge can realize the output of the periodic change waveform through the bridge, thereby realizing the measurement of the roller load.

[0030] The technical scheme of the bearing system with bearing load measurement of the application comprises at least one bearing roller with load measurement as described above.

[0031] The bearing of the application combines the rotation and load change characteristics of the bearing roller, and the strain gauges are arranged in the roller and the related detection circuit is arranged, so that the load monitoring based on the strain can be realized, and the reference strain value does not need to be collected, the processing difficulty is reduced, and the reliability, precision and durability of the bearing load measurement are improved.

[0032] Further, the bearing rollers with load measurement are multiple and uniformly distributed between the outer ring and the inner ring of the bearing.

[0033] For the bearing adopting the bearing roller with load measurement as described above, in order to improve the stability of the bearing operation, the positions of the same number of ordinary rollers are replaced by the bearing roller with load measurement, and the collected roller working conditions (posture, temperature, etc.) more comprehensively cover the operation process of the bearing. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 is a typical schematic diagram of a roller bearing;

[0035] Figure 2 is a typical schematic diagram of a roller bearing under stress;

[0036] Figure 3 is a schematic diagram of the through hole opening of the roller with load measurement of the application;

[0037] Figure 4 is a schematic diagram of the roller with load measurement of the application;

[0038] Fig. 5 (a) is a schematic diagram of the axial through hole of a 100mm diameter roller;

[0039] Fig. 5 (b) is an A-A sectional view of Fig. 5 (a);

[0040] Fig. 6 (a) is a B-B sectional view of Fig. 6 (b);

[0041] Fig. 6 (b) is a schematic diagram of the strain gauge installation of the roller with load measurement of the application;

[0042] Figure 7 is a schematic diagram of the load measurement circuit of the roller with load measurement of the application;

[0043] Figure 8This is a circuit diagram of the strain signal amplification and conditioning circuit with a load measuring roller of the present invention;

[0044] Figure 9 This is a circuit diagram of the AD acquisition and CPU encoding wireless transmission circuit with a load measuring roller of the present invention.

[0045] Wherein: 1: outer ring of bearing; 2: inner ring of bearing; 3: roller; 31: through hole; 32: blind hole for marking; 41: circuit board; 42: power supply unit; 43: strain gauge. Detailed Implementation

[0046] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0047] Bearing roller Example 1:

[0048] like Figure 1 The image shows a typical roller bearing, whose structure includes an outer ring 1, an inner ring 2, and rollers 3.

[0049] This invention addresses the problem of detecting changes in force, temperature, and attitude of bearing rollers by designing an intelligent bearing roller capable of real-time detection and transmission of roller load, temperature, and attitude. Based on the rotation of the rollers within the bearing, a single roller can traverse the working conditions of all rollers. Theoretically, one roller within the same raceway of the bearing can reflect all possible load conditions encountered within that raceway. Therefore, one roller within a raceway can be selected and modified into an intelligent roller with test transmission capabilities. To improve data reliability and sampling stability, two or more rollers with test transmission capabilities can also be symmetrically placed within the bearing system.

[0050] Figure 1 The roller bearing shown is designed to withstand primarily radial force, and the stress state of the rollers is as follows: Figure 2 As shown in the figure, the arrows indicate the direction of the external force acting on the roller.

[0051] Without affecting the strength of the roller structure, such as Figure 3 As shown, a through hole 31 is cut along the axis of the roller 3. A circuit board 41 for the testing system is placed inside the through hole. The circuit board 41 is equipped with temperature and attitude sensors, load measurement circuitry, data processing, and wireless transmission modules. A power supply unit 42 for power supply is also installed inside the through hole. A strain gauge 43 for load detection is installed on the inner circumference of the through hole. The load measurement circuit is connected to the strain gauge to detect the stress on the inner circumference of the through hole through resistance changes. The stress change on the inner circumference of the through hole reflects the load change of the roller. Figure 4The real-time measurement and data transmission in the rolling state are completed. Meanwhile, a mark hole 32 is punched on the end face of the roller corresponding to the position of one of the strain gauges, so as to facilitate the load calibration of the roller on the test bed.

[0052] Through measurement, when the ratio of the diameter of the hollow in the axis to the diameter of the roller is less than 29%, the deformation of the hollow roller is not more than 1% under the same pressure load as the solid roller, which does not affect the mixed use of the measured roller and other normal rollers, and the load condition of the roller can be normally reflected.

[0053] Taking a roller with a diameter of 100mm as an example, as shown in FIG. 5(a) and FIG. 5(b), the processing process is as follows: a through hole with a diameter of 29mm is first processed in the middle of the roller blank, then the roller is ground, heat treated and strengthened to reach the degree of preparing for assembling the bearing together with the normal solid roller, then the hollow roller is taken out, assembled into the test system and sealed at both ends of the through hole, and finally assembled into the bearing together with other normal solid rollers.

[0054] Generally, strain measurement is commonly used in load measurement, but a reference value is generally needed, and the corresponding proportional load value can be obtained by comparing the difference between the reference strain gauge and the stress change strain gauge, and the deformation of the bearing roller is extremely small, which is difficult to measure directly by the strain gauge. The strain test method is designed in combination with the unique stress condition of the bearing roller.

[0055] Specifically, as shown in FIG. 6(a) and FIG. 6(b), the strain measurement method of the test system of the present application includes uniformly pasting four strain gauges of the same specification every 90° along the circumferential direction of the inner hole in the center part of the roller, and the four strain gauges are divided into two groups, and the two strain gauges separated by 180° are one group (i.e. the opposite two are one group), and the two groups of strain gauges are marked as X1, X2 and Y1, Y2 respectively.

[0056] The method of the present application combines the different deformation conditions of the two groups of strain gauges when the roller is under pressure load, when the roller is pressed along the X direction, the strain at the positions of X1 and X2 is elongation, and the corresponding strain resistance is increased; at the same time, the deformation strain at the positions of Y1 and Y2 is reduced, and the corresponding strain resistance is reduced, and the bridge composed of X1, X2 and Y1, Y2 can measure the corresponding load size by using the unique load deformation condition of the roller itself. The method of the present application fully utilizes the opposite deformation in the orthogonal direction under the pressure condition of the roller, and maximally measures the corresponding load value.

[0057] The strain gauge measurement circuit (load measurement circuit) is as follows: Figure 7As shown, the strain gauges X1, X2, Y1 and Y2 constitute four bridge arms of the bridge, respectively, an input terminal Vin1 is led out from the middle of the bridge arm where X1 and Y1 are located, an input terminal Vin2 is led out between the bridge arms where X2 and Y2 are located, a signal output terminal Vout1 is led out between the bridge arms where X1 and Y2 are located, and a signal output terminal Vout2 is led out between the bridge arms where Y1 and X2 are located. A constant voltage excitation signal is applied to the input terminals Vin (Vin1 and Vin2) The output signal of the strain resistance corresponding to the load on the roller is obtained at the signal output terminals Vout (Vout1 and Vout2) .

[0058] Specifically, under the input of the reference voltage excitation Vin, the output signal Under the condition that the roller is pressed, the roller rolls one round, and the signal output by the bridge is two complete sinusoidal waves. Assuming that the signal is collected from the position of the roller as shown in Fig. 6 (b) and the vertical pressing condition, when the roller rotates by 90°, Y1 and Y2 change from the maximum resistance to the minimum resistance, and X1 and X2 change from the minimum resistance to the maximum resistance. At the same time, the bridge signal gradually decreases from the maximum peak value with the rotation of the roller, until the bridge signal becomes a negative peak value when the roller rotates by 90°, and the cycle is repeated. At the same time, it can be seen from the formula of the output signal that the two strain gauges with the same change direction have a superposition effect on the output signal, and the difference between the superposition result and the result of the other change direction further amplifies the output signal and increases the measurement accuracy. At the same time, the size of the load on the roller can be obtained from the positive and negative peak values of the output signal (generally, the load on the roller can be considered constant when the roller rotates one round).

[0059] As another embodiment, a plurality of strain gauges are arranged at positions every 90° apart in the circumferential direction of the inner hole, and the strain gauges at the same position are connected in series to serve as a bridge arm, so as to further amplify the resistance value change of the strain gauges in the same bridge arm due to deformation.

[0060] Alternatively, the angle between the four strain gauges in the circumferential direction of the inner hole is slightly greater than or less than 90°. In this case, when the deformation of one strain gauge is the largest, the deformation of the other strain gauges does not absolutely reach the maximum, but the resistance value change directions of the strain gauges are still opposite, for example, the resistance value of the strain gauge close to the contact position of the roller and the inner and outer rings increases, and the resistance value of the strain gauge close to the suspended position of the roller decreases. It should be understood by those skilled in the art that when the four strain gauges are connected to the four bridge arms of the bridge, the technical effects of the present application can also be achieved, so the relative direction is not absolutely opposite, and / or the angle between the straight lines where the other two opposite directions are located is not exactly 90°. Therefore, the scheme should also fall within the protection scope of the present application.

[0061] The output signals at both ends of the signal output terminal Vout are amplified and conditioned, and then sent to the CPU's AD acquisition unit in two paths (positive and negative) for digital processing. They are then combined with temperature and attitude signals, encoded, and wirelessly transmitted.

[0062] Strain signal amplification and conditioning circuit, such as Figure 8 As shown, two INA333AIDGKT operational amplifier chips are used. Power consumption .

[0063] AD acquisition and CPU encoding wireless transmission circuit, such as Figure 9 As shown, an nRF52832 chip is used.

[0064] Bearing roller Example 2:

[0065] The difference between the bearing roller in this embodiment and the bearing roller embodiment 1 is that any one of the four strain gauges 43 in Figures 6(a) and 6(b) is removed, and at the same time... Figure 7 The strain gauges in the bridge arm of the bridge have been removed, and a resistor with the same resistance rating as the strain gauge is connected in series.

[0066] The bearing rollers in this embodiment can also output a signal that amplifies the resistance of the strain gauge due to a certain degree of deformation, which changes periodically with the rotation of the rollers, thus achieving accurate load measurement.

[0067] Bearing roller Example 3:

[0068] The difference between the bearing roller in this embodiment and the bearing roller embodiment 1 is that any two of the four strain gauges 43 in Figures 6(a) and 6(b) are removed, and at the same time... Figure 7 The two bridge arms corresponding to the strain gauges in the bridge have been replaced with resistors of the same resistance rating as the strain gauges.

[0069] The bearing rollers in this embodiment can also output a signal that amplifies the resistance of the strain gauge due to a certain degree of deformation, which changes periodically with the rotation of the rollers, thus achieving accurate load measurement.

[0070] Bearing system example:

[0071] The present invention discloses a bearing system with roller load detection, wherein at least one roller of the bearing is a smart roller as described in the bearing roller embodiment, which has been described sufficiently in the bearing roller embodiment and will not be repeated here.

[0072] In other embodiments, the bearing system of the present invention may also have multiple smart rollers to increase the reliability and sampling density of data sampling; at the same time, multiple smart rollers with measuring devices are evenly distributed to ensure smooth bearing rotation.

Claims

1. A bearing roller with load measurement, characterized in that, The circuit includes a through hole at the axial center. Strain gauges are installed at four positions 90 degrees apart along the circumferential direction on the inner wall of the through hole. Each strain gauge is connected in series on a bridge arm, and the four bridge arms corresponding to the four positions form a bridge. Any two directly connected bridge arms are the two bridge arms containing the strain gauges at two adjacent positions along the inner wall. One end of a pair of bridge arms containing the strain gauges at two adjacent positions along the inner wall is provided with a signal input terminal, and the other end of another pair of bridge arms containing the strain gauges at two adjacent positions along the inner wall is provided with a signal input terminal. The two ends of the remaining two directly connected bridge arms without signal input terminals are respectively provided with signal output terminals.

2. The bearing roller with load measurement according to claim 1, characterized in that, A strain gauge of the same size is attached to each location.

3. The bearing roller with load measurement according to claim 1, characterized in that, Four strain gauges are located on the circumferential direction of the inner wall of the through hole at the middle position.

4. The bearing roller with load measurement according to claim 1, characterized in that, A temperature sensor and an attitude sensor are also installed in the through hole.

5. The bearing roller with load measurement according to claim 1, characterized in that, The ratio of the diameter of the through hole to the diameter of the corresponding roller is less than 29%.

6. A bearing roller with load measurement, characterized in that, Strain gauges are placed at any three of four positions on the circumferential surface of the through hole, spaced 90 degrees apart along the circumference. Each strain gauge is connected in series on a bridge arm. The three bridge arms corresponding to the three positions and a bridge arm with a resistor connected in series are connected end to end to form a bridge. Any two directly connected bridge arms with strain gauges connected in series are the two bridge arms containing strain gauges at two adjacent positions on the circumference of the inner wall. One end of a signal input terminal is set between the bridge arms containing strain gauges at two adjacent positions on the circumferential surface of the inner wall, and the other end of a signal input terminal is set between the bridge arm containing the strain gauge at the third position and the bridge arm containing the resistor. The two ends of a signal output terminal are set between the two directly connected bridge arms without a signal input terminal.

7. The bearing roller with load measurement according to claim 6, characterized in that, A strain gauge of the same size is attached to each location.

8. A bearing roller with load measurement, characterized in that, Strain gauges are placed at any two of the four pairs of opposite positions on the circumferential surface of the through hole, which are 90 degrees apart in the circumferential direction. Each strain gauge is connected in series on a bridge arm. The two bridge arms corresponding to the two positions and the two bridge arms connected in series with resistors are connected end to end to form a bridge. If strain gauges are installed at two opposite positions on the inner wall circumference, the two ends of the two bridge arms corresponding to the two positions are connected by a bridge arm with a resistor in series to form a bridge; and one end of the bridge arm where one strain gauge is located is set between the bridge arm with the resistor in series, and the other end of the bridge arm where the other strain gauge is located is set between the bridge arm with the resistor in series; the two ends of the two directly connected bridge arms without signal input terminals are respectively set between the two ends of the signal output terminals. If strain gauges are installed at two adjacent positions on the inner wall circumferentially, then the two bridge arms corresponding to the two positions are directly connected at one end and connected at the other end through two bridge arms with resistors in series to form a bridge. A signal input terminal is set between the bridge arms where the two strain gauges are located, and the other end of the signal input terminal is set between the two bridge arms with resistors in series. Alternatively, a signal input terminal is set between the bridge arm where one strain gauge is located and a bridge arm with resistors in series, and the other end of the signal input terminal is set between the bridge arm where another strain gauge is located and another bridge arm with resistors in series. The two directly connected bridge arms without signal input terminals are respectively set between the two ends of the signal output terminal.

9. The bearing roller with load measurement according to claim 8, characterized in that, A strain gauge of the same size is attached to each location.

10. A bearing system with bearing load measurement, characterized in that, It includes at least one bearing roller as described in any one of claims 1 to 9.

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