JP2010085099A - Device and method for monitoring deterioration of antivibration rubber - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device for monitoring deterioration of antivibration rubber which can detect specific deterioration of the rubber quality of the vibration control rubber directly, promptly and accurately. <P>SOLUTION: The device includes sensors 4a and 4b which are provided respectively on the vibration source side and the vibration transmission side of the antivibration rubber 3 of a passive type, an operation means 5 which is provided for calculating the vibration transmissibility from the vibration source side to the vibration transmission side, from the results of detection of the individual sensors 4a and 4b, and a determination means 6 which is provided for monitoring a change with time of the vibration transmissibility and thereby determining the deterioration of the antivibration rubber. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an anti-vibration rubber for a passive die, that is, an anti-vibration rubber that does not perform active control, such as an active type vibration rubber, and particularly relates to a rubber deterioration monitoring apparatus and a monitoring method using the apparatus. In particular, it proposes a technology to prevent vibration troubles and damage of the device itself using vibration isolating rubber by detecting the occurrence of performance deterioration and failure of vibration isolating rubber quickly. It is.

  This type of anti-vibration rubber, which is applied to various devices and functions to prevent transmission of generated vibrations to other device components, is generally handled as a replacement part with a predetermined usage time. It was handled as having durability equivalent to the lifetime of the device body to which it was applied.

  However, anti-vibration rubber, which has rubber properties as an essential component, may be subject to unexpected and early deterioration due to environmental factors and physical factors that affect the rubber quality. There is also a risk that the device itself may be damaged and become unusable due to unintentional breakage of a specific anti-vibration rubber.

In relation to such rubber deterioration, Patent Documents 1 and 2 each describe that an anti-vibration rubber under the action of the driving means when the magnitude of a signal accompanying the rubber deterioration exceeds a threshold value. In addition, a so-called active mount is disclosed in which a function correction necessary for exhibiting a required vibration damping function is performed.
JP-A-8-270723 JP 2006-57753 A

  However, in these prior arts, sensors that can detect vibration displacement, speed, acceleration, force, etc. are not provided on the vibration source side, that is, the vibration source side and the vibration transmission side. Therefore, it is not possible to directly determine the specific vibration transmission rate transmitted from the vibration source side to the vibration transmission side, and thus the specific degree of deterioration of the rubber material, and therefore monitoring the change in vibration transmission rate over time. Therefore, there has been a problem that the deterioration of the rubber quality of the vibration-proof rubber cannot be detected quickly and accurately.

  An object of the present invention is to solve such problems of the prior art, and the object of the invention is to directly accelerate the specific deterioration of the rubber quality of the vibration-proof rubber. Furthermore, another object is to provide a vibration monitoring rubber deterioration monitoring device that can be accurately detected, and a monitoring method using the device.

  According to the present invention, the vibration damping rubber deterioration monitoring device is preferably provided on each of the vibration source side and the vibration transmission side of the passive type vibration damping rubber, preferably including the inside of the vibration damping rubber, sufficiently close to it, Sensors, for example, sensors for load, acceleration, speed, displacement, etc. are provided, calculation means for obtaining the vibration transmissibility from the vibration source side to the vibration transmission side from the detection results of each sensor, and the vibration transmission By monitoring the change in the rate over time, the deterioration of the rubber properties of the anti-vibration rubber, especially the anti-vibration rubber, according to the amount of change in the vibration transmissibility relative to the vibration transmissibility at the time of a new product or the allowable transmissibility The determination means for determining is provided.

  Here, “vibration transmission rate” means the percentage of the ratio of transmission-side acceleration to vibration-source-side acceleration when a vibration acceleration sensor is used as a sensor. , The ratio of the ratio to the vibration source side velocity, and when using a displacement sensor, the percentage of the ratio of the transmission side displacement to the vibration source side displacement, respectively, and when using a load sensor, It shall be the percentage of the ratio of the transmission side input to the vibration source side input.

  Also, the vibration acceleration sensor as a sensor here is advantageous for detecting an increase in vibration on the vibration transmission side accompanying an increase in the spring constant, and a displacement sensor is provided on the vibration source side as the spring constant decreases. The load sensor is advantageous for detecting an increase in the anti-vibration rubber reaction force transmitted to the vibration transmission side as the spring constant increases. It is.

  By the way, the anti-vibration rubber which is the object of the present invention is a rubber type of the total rubber type, liquid type, and a type incorporating a spring member such as a coil spring, except for the mounting portion. And so on.

Here, preferably, a notification means for issuing an alarm is provided based on the determination of abnormality by the determination means, that is, the determination that the rubber quality of the vibration-proof rubber has deteriorated beyond the allowable limit.
The alarm in this case can be sound, color, smell, etc. The alarm can be generated in real time or at the time of vehicle inspection. The location where the alarm is generated can be a vehicle body indicator, a vehicle body management company, a sales company, a manufacturer, or the like.

  Preferably, a plurality of anti-vibration rubbers are disposed between the vibration source side and the vibration transmission side, and are made to correspond to each anti-vibration rubber, more preferably as close as possible to each anti-vibration rubber. And at least a pair of sensors.

  Also preferably, in a liquid-filled type anti-vibration rubber comprising an inner cylinder and an outer cylinder, and a rubber elastic body connecting both of them, and containing the liquid therein, the inner cylinder A sensor is provided on each of the outer cylinders.

  The deterioration monitoring method of the vibration isolating rubber according to the present invention is based on the detection result of the sensors disposed on the vibration source side and the vibration transmission side of the passive type anti-vibration rubber, and the vibration from the vibration source side to the vibration transmission side. The transmissibility is calculated and the change with time of the vibration transmissibility is monitored to determine the degree of deterioration of the anti-vibration rubber based on whether or not the vibration transmissibility exceeds an allowable limit value.

In the device according to the present invention, for example, a vibration acceleration sensor is provided on each of the vibration source side and the vibration transmission side of the passive type anti-vibration rubber, and from the detection results of those sensors,
(Transmission side acceleration / vibration source side acceleration) x 100%
The vibration transmissibility that can be obtained by the above is calculated by the calculation means, and the vibration transmissibility is monitored over time, and whether or not the vibration transmissibility exceeds, for example, a predetermined allowable limit value. By determining by the determining means, whether or not the vibration isolating rubber is a liquid-filled type, the specific deterioration of the rubber vibration isolating rubber is detected directly, quickly and with high accuracy. And the life of the anti-vibration rubber can be predicted.
Accordingly, it is possible to prevent the occurrence of major troubles.

  By the way, the deterioration of rubber is caused by the use environment of the anti-vibration rubber, and also caused by the use condition. For example, depending on the oxidation deterioration of the rubber, thermosetting, sag, etc. On the other hand, the phenomenon that the spring constant increases and the amount of deformation decreases, on the other hand, depending on the swelling of the rubber due to oil, the peeling of the rubber due to the solvent, the occurrence of cracks in the rubber due to repeated input or excessive input, etc. Since the phenomenon that the constant decreases and the amount of deformation increases occurs, the above-described deterioration determination is performed on the increase side and the decrease side of the vibration transfer rate, respectively. It is necessary to set an allowable limit value on the side.

  In this case, when the main vibration direction of the vibration source is known, it is particularly preferable to obtain the vibration transmissibility in the vibration direction under the selection of the vibration-proof rubber installation posture, which is also a reference. The vibration transmissibility can be, for example, the transmissibility of the anti-vibration rubber when it is new, or it can be 100%, which is the boundary of the anti-vibration region, and the allowable limit value is the rubber quality In relation to the degree of deterioration of, for example, the range of ± 30% of the transmission rate of the vibration-proof rubber when new, or less than 100% of the boundary of the vibration-proof region can be set.

  Here, when determining the deterioration of the anti-vibration rubber as described above, if the object to be anti-vibration by the anti-vibration rubber is an engine, vibration transmission is performed under the idling vibration frequency when the vehicle is stopped. It is preferable to calculate the rate in order to remove the influence of running vibration, work vibration, and the like.

In the above description, when the notification means for issuing an alarm based on the determination of abnormality by the determination means when the rubber quality of the vibration-proof rubber has deteriorated beyond the allowable limit, the determination means always Without monitoring, it is possible to more reliably recognize the deterioration of the rubber quality with light, sound and other alarms generated by the notification means, and it is possible to more easily prevent the occurrence of major troubles.
Of course, the alarm in this case can be generated in real time, but it can also be generated at the time of inspection of the vehicle body under the storage of data. Contractors, sales companies, manufacturers, etc. are considered.
The data storage destination at this time can be a vehicle body, a relay server, a manufacturer's main server, or the like.

Further, here, a plurality of vibration isolating rubbers are disposed between the vibration source side and the vibration transmitting side, and at least a pair of sensors are more preferably associated with each anti-vibration rubber, more preferably each anti-vibration rubber. If it is placed as close to it as possible, the vibration on the vibration source side and the vibration on the vibration transmission side are detected with higher accuracy, and the vibration transmission rate is more accurate for each anti-vibration rubber. Can be performed.
This is more conspicuous when a plurality of pairs of sensors are provided corresponding to each anti-vibration rubber.

  Here, for example, when a sensor that can be an acceleration sensor on the vibration source side is disposed away from the vibration-proof rubber and corresponding to the center of rotation of the vibration source, the vibration of the vibration-proof rubber Even though vibration is generated at the connection point to the source side, the sensor itself may not be able to detect vibration, and if the sensor is installed on a thin plate, the inherent property of the thin plate Since inconveniences such as inability to accurately detect the actual vibration due to the influence of the frequency, etc. will occur, it is preferable that the sensor, including the inside of the anti-vibration rubber, be arranged sufficiently close to it, Moreover, it is preferable to arrange | position in the site | part which has sufficient rigidity also including the structural member of a vibration-proof rubber.

  In such a monitoring device, the anti-vibration rubber includes an inner cylinder and an outer cylinder, and a rubber elastic body that communicates both of them, and the internal liquid chamber enclosing the liquid is divided into two parts that are communicated via a restriction passage. When configured as a liquid chamber, it is possible to prevent the occurrence of the above-described problems caused by the sensor mounting locations, etc., by arranging the required sensors in each of the inner cylinder and the outer cylinder. Thus, the calculation accuracy of the vibration transmissibility can be sufficiently increased, so that the specific deterioration degree of the rubber quality of the anti-vibration rubber can be detected directly and accurately.

  And according to the monitoring method which concerns on this invention, determination of the rubber quality deterioration of a vibration-proof rubber can be performed sufficiently accurately.

FIG. 1 is a conceptual diagram showing an embodiment of an apparatus according to the present invention, in which 1 is a vibration source side member that can be an engine or the like, and 2 is a vibration that can be a body frame or the like. The transmission side member and 3 are passive type anti-vibration rubbers that are fixedly disposed between the members 1 and 2 via a bracket (not shown).
The anti-vibration rubber 3 here is arranged in a posture that can function sufficiently effectively for damping the vibration source side member 1 in the main vibration direction.

  As shown in this drawing, the high-rigidity attachment portions 3a and 3b of the anti-vibration rubber 3 to the members 1 and 2 are respectively provided with the required sensors 4a on the vibration source side and the vibration transmission side. 4b, for example, an acceleration sensor is fixed or fixed.

In addition, here, the sensors 4a and 4b on the vibration source side and the vibration transmission side are signal-connected to the calculation means 5, and the calculation means 5 calculates the vibration transmission rate from the vibration source side member 1 to the vibration transmission side portion 2. Ask.
Specifically, the vibration transmissibility using the acceleration sensors 4a and 4b is as follows:
(Transmission side acceleration / vibration source side acceleration) x 100%
When the vibration transmissibility is less than 100%, it is usually possible to use a total rubber type, a liquid-filled type, a built-in spring member type, etc. The rubber 3 exhibits a vibration damping function.

Then, the vibration transmissibility calculated in this way is input to the determination means 6 by the calculation means 5, and the determination means 6 monitors the change in vibration transmissibility over time.
This monitoring by the judging means 6 is based on whether the vibration transmissibility exceeds, for example, a predetermined upper limit side threshold value or a lower limit side threshold value. This is done by judging deterioration.

  In this case, the threshold values on the upper limit side and the lower limit side are, for example, 30% change allowable ranges on the upper side and the lower side of the reference value with reference to the transmission rate when the vibration-proof rubber is new. When the vibration transmissibility input to the determination means 6 exceeds the upper limit value of the threshold value, the increase in the spring constant due to the deterioration of the rubber quality is below the lower limit value of the threshold value. If it occurs, it can be determined that a decrease in the spring constant due to the deterioration of the rubber is occurring, and the cause of the deterioration of the rubber can be predicted.

  The result of such deterioration determination by the determining means 6 can be notified of the degree of deterioration of the anti-vibration rubber, for example, by transmitting it to a vehicle body indicator, a vehicle body management company, a manufacturer, or the like.

  By the way, when the determination means 6 as described above is further connected to the notification means 7 and the determination of the abnormality is performed by the determination means 6, that is, the vibration transmissibility exceeds the upper limit side or lower limit side threshold value. When the determination by the determination unit 6 is performed, the notification unit 7 is operated, and then an alarm that can be set to sound, light, smell, etc. is generated, which causes the deterioration of the anti-vibration rubber. It is preferable to make recognition wider and more reliable.

As shown in the figure, when a plurality of anti-vibration rubbers 3 are arranged between the vibration source side and the vibration transmission side, a pair of sensors 4a and 4b are arranged corresponding to each anti-vibration rubber 3. It is preferable to increase the deterioration determination accuracy for each vibration isolating rubber 3.
When each vibration isolating rubber 3 is provided with a pair of sensors 4a and 4b, and when calculating the vibration transmissibility, the average value of the detection results of the respective sensors is used, the anti-vibration rubber 3 is used. The vibration transmissibility can be calculated with higher accuracy while suppressing the influence of the sensor mounting position and the like sufficiently small.

  As shown in FIG. 1, high-rigidity mounting portions 3a and 3b fixed to the vibration source side member 1 and the vibration transmission side member 2 of the vibration isolating rubber 3, that is, the sensor 4a is attached to the vibration isolating rubber itself. , 4b has been described, but the sensors 4a, 4b can also be arranged on brackets (not shown) formed to project from the vibration source side member 1 and the vibration transmission side member 2, respectively. Further, only one of the sensors can be disposed on the bracket, and the other sensor can be disposed on the vibration isolating rubber itself.

FIG. 2 is a conceptual diagram showing another example of the arrangement of the sensor, which is interposed between the engine as the vibration source side member 1 and the vehicle body frame as the vibration transmission side member 2. An example in which a sensor is disposed on an engine mount as an anti-vibration rubber 3 is shown. Here, an acceleration sensor 4a on the engine side is disposed at a position in the vicinity of the engine mount of an engine foot 1a that supports the engine, and a vehicle body frame. The side acceleration sensor 4b is disposed in the vicinity of the engine mount of the vehicle body frame itself as the vibration transmission side member 2. In such an arrangement mode of the sensors 4a and 4b, the sensor 4a, Vibration transmissibility (transmission-side acceleration / vibration-side acceleration) x 100% on condition that both 4b arrangement members have sufficient rigidity
Can be obtained with sufficiently high accuracy.

FIG. 3 is a schematic vertical sectional view showing an example of the arrangement of the acceleration sensors 4a and 4b on the liquid-filled type vibration-proof rubber 3. As shown in FIG.
Here, while providing the inner cylinder 8, the outer cylinder 9 concentric with the inner cylinder 8, for example, and the rubber elastic body 10 that couples the inner and outer cylinders 8 and 9 in a liquid-tight manner, A partition which is partitioned below the inner cylinder 8 and the rubber elastic body 10, the lower end is closed with a flexible film body 11, and an internal liquid chamber 12 formed by enclosing a liquid inside is fixed to the inner cylinder 8. The member 13 is divided into two upper and lower divided liquid chambers 12a and 12b, and the two divided liquid chambers 12a and 12b are separated by a restriction passage 14 formed by a clearance between the partition member 13 and the outer cylinder 9. The anti-vibration rubber 3 is configured by communicating with each other, and the respective acceleration sensors 4a and 4b are disposed in the inner cylinder 8 and the outer cylinder 9 of the anti-vibration rubber 3, respectively.

  Each of the acceleration sensors 4a and 4b arranged in this way is attached, for example, by attaching the inner cylinder 8 to the vibration source side member and the outer cylinder 9 to the vibration transmission side member, or vice versa. Thus, the vibration acceleration of each member can be detected with high accuracy.

  By the way, this anti-vibration rubber 3 shown in FIG. 3 has a damping function by the downward deformation of the rubber elastic body 10 with respect to the outer cylinder 9 when the downward vibration input is applied to the inner cylinder 8. In conjunction with this deformation of the rubber elastic body 10 and the downward displacement of the inner cylinder 8, the partition member 13 is displaced downward to reduce the volume of the lower divided liquid chamber 12b. The vibration damping function can also be exhibited by increasing the volume of the upper divided liquid chamber 12a and allowing the liquid in the divided liquid chamber 12b to flow into the divided liquid chamber 12a via the restriction passage 14.

  FIG. 4 shows an application example of the anti-vibration rubber 3 with the acceleration sensors 4a and 4b arranged as described above, as a cabin mount, for civil engineering work vehicles, construction work vehicles, and the like. Here, for example, the inner cylinder 8 is attached to the cabin as the vibration source side member 1 as illustrated by the one-dot chain line in FIG. 3, and the vehicle body as the vibration transmission side member 2 is shown. By attaching the outer cylinder 9 to the frame as shown by a two-dot chain line in FIG. 3, the vibration acceleration of each part can be detected with high accuracy as described above.

  The calculation of the vibration transmissibility from the vibration acceleration on each side detected in this manner is the same as described above, but in any case, for example, the detection is performed by the acceleration sensor 4a on the vibration source side. FIG. 5 (a) illustrates the time change of the acceleration, and the detection result by the acceleration sensor 4b of the vibration transmission example is illustrated in FIG. 5 (b). If the frequency analysis of the detection result is as illustrated in FIGS. 5C and 5D, the frequency of the anti-vibration rubber 3 that is pre-tuned to control the vibration of the anti-vibration target frequency P (Hz). The vibration transmissibility of P (Hz) is as illustrated in FIG. 5 (e), and the vibration transmissibility at this time of frequency P (Hz) is both allowed on the upper limit side and the lower limit side with respect to the reference value. Fit in range When the rubber cushion 3, can be said that are sufficiently exhibit the required damping function, in which case, the determination unit 6, the deterioration determination of the rubber is not performed.

  On the other hand, when the vibration transmissibility of the frequency P (Hz) exceeds the allowable range on either the upper limit side or the lower limit side during the time-dependent monitoring of the vibration transmissibility by the determination unit 6, the determination unit 6 determines that the rubber has deteriorated to an abnormal level.

  In such a case, when the notification means 7 is connected to the determination means 6, an alarm such as sound, light, smell, etc. is issued from the notification means 7.

  3 and 4, the case where the acceleration sensors 4a and 4b are respectively disposed in the inner cylinder 8 and the outer cylinder 9 of the vibration isolating rubber 3 has been described. 4a can be disposed in the cabin as the vibration source side member 1 in the vicinity of the vibration isolating rubber 3, and the other acceleration sensor 4b is also in the vicinity of the vibration isolating rubber 3 at the vibration transmitting side member. It can also be arranged on the body frame as 2.

As described above, the case where the acceleration sensor is provided as the sensor has been described. However, instead of the acceleration sensor, a load sensor, a speed sensor, a displacement sensor, or the like can be used.
(Transmission side detection value / vibration side detection value) x 100%
Can be calculated as

It is a conceptual diagram which shows embodiment of the apparatus which concerns on this invention. It is a conceptual diagram which shows the other example of arrangement | positioning of a sensor about the part. It is a longitudinal cross-sectional view which shows the example of arrangement | positioning of the sensor to the inner and outer cylinders of a liquid-filled type vibration-proof rubber. It is a basic diagram which shows the example of application of the vibration isolator shown in FIG. It is explanatory drawing about the damping function of vibration-proof rubber.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vibration source side member 2 Vibration transmission side member 3 Anti-vibration rubber | gum 3a, 3b Attachment part 4a, 4b Sensor 5 Calculation means 6 Determination means 7 Notification means 8 Inner cylinder 9 Outer cylinder 10 Rubber elastic body 11 Flexible film body 12 Internal liquid Chambers 12a, 12b Divided liquid chamber 13 Partition member 14 Restricted passage

Claims (5)

  Sensors are provided on each of the vibration source side and vibration transmission side of the passive type anti-vibration rubber, and calculation means for obtaining the vibration transmissibility from the vibration source side to the vibration transmission side is provided from the detection result of each sensor, An anti-vibration rubber deterioration monitoring device provided with a determination means for monitoring the vibration transmissibility change with time and determining deterioration of the anti-vibration rubber.   The anti-vibration rubber deterioration monitoring device according to claim 1, further comprising a notification unit that issues an alarm based on determination of abnormality by the determination unit.   3. The anti-vibration system according to claim 1, wherein a plurality of anti-vibration rubbers are disposed between the vibration source side and the vibration transmission side, and at least a pair of sensors are disposed corresponding to the anti-vibration rubbers. Vibration rubber deterioration monitoring device.   An inner cylinder and an outer cylinder, and a rubber elastic body for connecting both of them, and a sensor is provided in each of the inner cylinder and the outer cylinder of a vibration-proof rubber in which a liquid is sealed. 4. The vibration monitoring apparatus for vibration proof rubber according to any one of 3 above.   The vibration transmissibility from the vibration source side to the vibration transmission side is calculated from the detection results of the sensors installed on the vibration isolation source side and vibration transmission side of the passive type anti-vibration rubber. A method of monitoring the deterioration of the anti-vibration rubber by monitoring the change over time and determining the degree of deterioration of the anti-vibration rubber based on whether or not the vibration transmissibility exceeds an allowable value.

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