JP2010096278A - Vibration damping structure and vibration damping device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide vibration damping structure and a vibration damping device capable of surely damping vibration of a plurality of vibration mode in a wide range of frequency region. <P>SOLUTION: This vibration damping structure is connected to a power generating section 11 for generating power through a transmission shaft 13 and formed in a transmitted part 14, to which power generated from the power generating section 11 is transmitted through the transmission shaft 13. This vibration damping structure includes: a vibration detecting section 21 capable of detecting vibration, which is generated in at least the transmitted part 14 when the power generating section 11 generates power, by displacing with vibration; a vibration damping section 22 capable of damping vibration; and a control section 23 for controlling the vibration damping section 22 so as to damp the vibration detected by the vibration detecting section 21, based on a result of the detection by the vibration detecting section 21. The vibration detecting section 21 and the vibration damping section 22 are provided in the transmitted part 14, and displaced in position in the cross direction of the transmitted part 14. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a vibration damping structure and a vibration damping device for damping vibration caused by a power generation unit.

  Conventionally, as this type of vibration damping structure, a power generation unit 510 (for example, an engine) that generates power, a transmitted unit 520 (for example, a differential) to which the power generated from the power generation unit 510 is transmitted, A driving system (power train) 500 including a transmission shaft 530 (for example, a propeller shaft) that connects the power generation unit 510 and the transmitted unit 520 and transmits the power generated from the power generation unit 510 to the transmitted unit 520. In order to increase the rigidity of the drive system 500, a rigid frame (for example, a power plant frame) is provided over the power generation unit 510 and the transmitted part 520, and resonance of primary vibration of the entire drive system 500 is provided. A vibration damper is installed on the rigid frame so as to correspond to the antinode position at the resonance frequency. Concrete is known (see Patent Document 1).

  In such a vibration damping structure, it is said that elastic vibration (particularly, primary vibration) of the entire drive system 500 can be effectively damped by the vibration damping action of the dynamic damper.

  By the way, the vibration of the drive system 500 formed by connecting the power generation unit 510 and the transmitted portion 520 with the transmission shaft 530 has various vibration modes depending on, for example, frequency fluctuations of power generated from the power generation unit 510. is there. For example, as shown in FIG. 9, the transmission shaft 530 and the transmitted part 520 both vibrate in the height direction (vertical direction) of the transmitted part 520, or as shown in FIG. There is a second vibration mode in which only the portion 520 vibrates in the height direction. Further, as shown in FIG. 11, a third vibration mode in which the transmitted portion 520 swings in the height direction around the connection portion with the transmission shaft 530, or as shown in FIG. There is a fourth vibration mode in which the connecting portion with the transmission portion 520 is displaced in the height direction, and accordingly, the transmission shaft 530 and the transmitted portion 520 swing in the height direction. Furthermore, as shown in FIG. 13, there is a fifth vibration mode in which the transmitted portion 520 rotates and vibrates around the axis of the transmission shaft 530. 9 to 13 show the whole or a part of the drive system 500 for convenience of explanation.

  However, in the damping structure described in Patent Document 1, the dynamic damper for damping is configured to be able to damping only the vibration applied to the vibration mode of a specific frequency. Vibrations in multiple vibration modes cannot be controlled.

On the other hand, as a damping structure for damping vibrations in a plurality of vibration modes, a plurality of elastic materials such as anti-vibration rubber are disposed on both height direction surfaces (upper and lower surfaces) of the differential case as the transmitted portion 520. Therefore, a damping structure in which the differential case is mounted has been proposed. In such a vibration damping structure, vibrations in a plurality of vibration modes such as vibration (pitching) and rotational vibration (rolling) in the height direction of the differential case can be suppressed by the elastic action of the elastic material that supports the differential case. It is supposed to be possible (see Patent Document 2 below).
JP 2004-150511 A JP 2005-271749 A

  However, since the vibration damping structure described in Patent Document 2 is a so-called elastic mount structure using the elastic material, in a low frequency region, a force related to vibration (so-called excitation) generated in the transmitted portion 520 is obtained. Force) is transmitted to other members in the same size without being reduced, and there is also a problem that resonance is caused by configuring the resonance system in relation to the mass of the drive system 500. It is substantially difficult to suppress vibrations in a plurality of vibration modes in a wide frequency range.

  Therefore, the present invention has been made in view of the above circumstances, and an object thereof is to provide a vibration damping structure and a vibration damping device capable of reliably damping vibrations applied to a plurality of vibration modes in a wide frequency range. .

  The present invention has been made to solve the above-described problems, and a vibration damping structure according to the present invention is connected to a power generation unit that generates power via a transmission shaft and generates power via the transmission shaft. The vibration control structure is formed in the transmitted part to which the power generated from the part is transmitted, and at least the vibration generated in the transmitted part when the power generating part generates the power is displaced by the vibration. Based on the detection result of the vibration detection unit, the vibration control unit capable of suppressing the vibration, and the detection result of the vibration detection unit, the vibration control unit is configured to control the vibration detected by the vibration detection unit. The vibration detecting unit and the damping unit are provided in the transmitted part, and are displaced in the width direction of the transmitted part.

  In the vibration damping structure having such a configuration, since the vibration detection unit and the vibration damping unit are provided in the transmitted portion, for example, the above-described first occurrence caused by frequency fluctuations of power generated from the power generation unit, etc. The vibration detector is displaced even in vibrations in any of the first to fifth vibration modes. Therefore, the vibration state of each vibration applied to each vibration mode can be detected by the vibration detection unit. Then, since the control unit controls the damping unit based on the detection result detected by the vibration detecting unit, the damping unit accurately controls the detected vibration, that is, the vibration that is actually occurring. Can do.

  In addition, for example, in the case where vibration is applied to the fifth vibration mode in which the transmitted part rotates and vibrates around the axis of the transmission shaft, even if the vibration is suppressed by the vibration suppressing part, the vibration suppressing part Residual vibration may occur where the transmitted part oscillates around an axis parallel to the axis of the transmission shaft that passes near the installation position of the installation part. However, the vibration control part and the vibration detection part are located in the width direction of the transmitted part. In other words, since the vibration control unit and the vibration detection unit are provided apart from each other in the width direction, the transmission shaft passing through the vicinity of the installation position of the vibration control unit like the residual vibration is provided. Even when the vibration around the axis parallel to the axis is generated in the transmitted part, the vibration detection unit can be displaced by the vibration and detect the vibration state of the vibration. And since a control part controls a vibration suppression part based on the detection result which a vibration detection part detected, this vibration suppression part can control the detected vibration exactly. In addition, it is preferable that the vibration control unit and the vibration detection unit are provided as far apart as possible in the width direction. Moreover, the width direction of a to-be-transmitted part is a direction orthogonal to the axis line of a transmission shaft, for example.

  In particular, the vibration detection unit is provided on one side in the width direction of the transmitted part with respect to a plane passing through the axis of the transmission shaft and parallel to the height direction of the transmitted part. It is preferable to be provided on the other side in the width direction of the transmitted part rather than the plane.

  According to such a configuration, even when a vibration around the axis parallel to the axis of the transmission shaft passing through the vicinity of the installation position of the vibration control portion occurs in the transmitted portion, for example, the residual vibration, the vibration is reliably Can be detected and controlled.

  The vibration detection unit is provided so as to be able to detect the vibration displaced in the height direction of the transmitted portion, and the vibration suppression unit is a vibration suppression unit for suppressing the vibration. It is preferable to be configured to generate vibration and to be provided so that a vibration suppression direction that is a vibration direction of the vibration suppression vibration is a direction along the height direction of the transmitted portion.

  When the power generation unit generates power, at least the vibration generated in the transmitted part is mainly the vibration in the height direction of the transmitted part, so that the vibration is detected by displacing in the height direction. Provided with a vibration detection unit, and by providing the vibration suppression unit so that the vibration suppression direction, which is the vibration direction of the vibration suppression vibration, is a direction along the height direction, the vibration can be reliably detected and effectively Vibration can be suppressed.

  In addition, the vibration damping device according to the present invention is provided in a transmitted part that is coupled to a power generation unit that generates power via a transmission shaft and to which power generated from the power generation unit is transmitted via the transmission shaft. A vibration detection unit configured to be capable of detecting at least vibration generated in the transmitted unit when the power generation unit generates power, and detecting the displacement by the vibration; A vibration control unit capable of controlling the vibration, and a control unit that controls the vibration control unit to control the vibration detected by the vibration detection unit based on a detection result of the vibration detection unit. The vibration detection unit and the vibration control unit are configured to be provided in the transmitted unit in a state of being displaced in the width direction of the transmitted unit.

  As described above, in the vibration suppression structure according to the present invention, the vibration detection unit and the vibration suppression unit are provided in the transmitted part, and the position is shifted in the width direction of the transmitted part. For example, the vibration detection unit can detect the vibration state of each vibration applied to a plurality of vibration modes caused by frequency fluctuation of power generated from the power generation unit, and the control unit based on the detection result As a result of controlling the vibration control unit with the above to reliably control the detected vibration, it is possible to reliably control vibrations applied to a plurality of vibration modes in a wide frequency range. Play.

  Further, the vibration damping device according to the present invention is configured so that the vibration detection unit and the vibration damping unit can be provided in the transmitted part in a state of being displaced in the width direction of the transmitted part. The vibration state of each vibration applied to a plurality of vibration modes caused by frequency fluctuations of power generated from the power generation unit can be detected by the vibration detection unit, and the control unit based on the detection result As a result of reliably controlling the detected vibration by controlling the vibration control unit, it is possible to reliably control the vibration applied to a plurality of vibration modes in a wide frequency range.

Hereinafter, an embodiment of a vibration damping structure and a vibration damping device according to the present invention will be described in detail with reference to the drawings.
1A and 1B show a vibration damping structure 1 according to this embodiment. The vibration damping structure 1 is a structure for damping vibrations of a drive system 10 of an automobile that drives rear wheels such as an FR vehicle and a 4WD vehicle, for example. A device 20 is provided.

  The drive system 10 includes an engine 11 as a power generation unit that generates power, a transmission 12 attached to the engine 11, a propeller shaft 13 as a transmission shaft having one end connected to the transmission 12, and the propeller shaft. 13 is connected to the other end, and a differential part 14 as a transmitted part to which power generated from the engine 11 is transmitted; a pair of drive shafts 15 having one end 151 connected to the differential part 14; And a tire 16 as a pair of rear wheels respectively connected to the other end 152 of the shaft 15.

  The engine 11 is configured to generate power by burning liquid fuel such as gasoline. In the present embodiment, power generation of the engine 11 is controlled by the engine control unit (ECU 111). The ECU 111 controls the ignition system and fuel system of the engine 11 and can output an engine speed related signal related to the engine speed such as the engine 11 speed and the engine 11 ignition command. It is configured. The engine speed related signal is always output.

  The transmission 12 is a transmission, and appropriately converts the power generated from the engine 11 and transmits it to the propeller shaft 13. In the present embodiment, the transmission 12 is connected to the rear end portion of the engine 11.

  The propeller shaft 13 is configured to be able to transmit power generated from the engine 11 to the differential portion 14. Specifically, the propeller shaft 13 is an axis whose axis C <b> 1 is formed along the front-rear direction, and a front end 131 that is one end thereof is coupled to the transmission 12. The propeller shaft 13 receives the power generated from the engine 11 as a torsional load via the transmission 12 and rotates around the axis C <b> 1 to transmit the power to the differential portion 14.

  The differential section 14 includes a differential gear (not shown) for transmitting power to the drive shaft 15 and a differential case 140 in which the differential gear is accommodated. The differential case 140 includes a main body portion 141 and a connecting portion 142 formed integrally with the main body portion 141.

  The main body portion 141 includes a top wall portion 1411 and a bottom wall portion 1412 that face each other in the height direction, a front wall portion 1413 and a rear wall portion 1414 that face each other in the front-rear direction, and a left wall portion 1415 and a right wall that face each other in the width direction. A box-shaped body including a portion 1416. The connecting portion 142 is a cylindrical body that protrudes forward from the front wall portion 1413 of the main body portion 141. In the present embodiment, the connecting portion 142 has a cylindrical shape whose axis is formed along the front-rear direction, and the outer diameter thereof is smaller than any of the main body portion 141 in the height direction and the width direction. Yes. That is, the dimension of the connecting part 142 in the height direction is smaller than the dimension of the main body part 141 in the height direction, and the dimension of the connecting part 142 in the width direction is smaller than the dimension of the main body part 141 in the width direction. ing. In the present embodiment, the axis of the connecting portion 142 is the center line C1 of the differential portion 14. The connecting portion 142 is not limited to a cylindrical shape, and may be a conical shape having a smaller diameter toward the front side.

  The differential portion 14 is connected to the other end portion of the propeller shaft 13. Specifically, in the differential portion 14, the connecting portion 142 is connected to the rear end portion 132 which is the other end portion of the propeller shaft 13 in such a direction that the axis C 1 of the propeller shaft 13 and the center line C 1 of the differential portion 14 coincide. By doing so, it is connected to the propeller shaft 13. Therefore, the center line C1 of the differential part 14 is a line along the front-rear direction. By this connection, the differential gear housed in the differential case 140 is engaged with the propeller shaft 13. In this way, when the differential portion 14 is connected to the other end portion of the propeller shaft 13, the power generated from the engine 11 is transmitted to the differential portion 14 via the propeller shaft 13.

  The drive shaft 15 is an axis whose axis C2 is formed along the width direction of the differential portion 14, and is provided in a pair on both sides in the width direction of the differential portion 14, and one end portion 151 is connected to the differential portion 14 respectively. Has been. Specifically, one end portion 151 of the drive shaft 15 is connected to the right wall portion 1416 or the left wall portion 1415 of the main body portion 141 of the differential case 140 and is connected to a differential gear housed in the differential case 140. A tire 16 is attached to the other end 152 of the drive shaft 15.

  In the drive system 10 having such a configuration, the power generated from the engine 11 is decelerated by the transmission 12 and transmitted to the propeller shaft 13, whereby the propeller shaft 13 rotates around its axis C1. As the propeller shaft 13 rotates, the power is transmitted to the differential portion 14 and the differential gear housed in the differential case 140 is operated. Then, when the differential gear is operated, power is transmitted from the differential portion 14 to the drive shaft 15, and the tire 16 rotates as the drive shaft 15 rotates about its axis C <b> 2.

  The vibration damping device 20 can detect the vibration of the differential part 14 (or the differential part 14 and the propeller shaft 13) generated by transmitting the power generated from the engine 11 by displacing the vibration by the vibration. A vibration detecting unit 21 capable of controlling the vibration, the vibration suppressing unit 22 capable of suppressing the vibration, and the vibration detecting unit 21 based on the detection result of the vibration detecting unit 21 so as to control the vibration detected by the vibration detecting unit 21. And a control unit 23 for controlling the vibration unit 22.

  The vibration detection unit 21 is a sensor that can detect the vibration state of the vibration by reading the acceleration, speed, displacement amount, and the like of the vibration by displacing, and vibration related to vibration such as the acceleration, speed, displacement amount, and the like. The related signal can be output. The vibration related signal is always output. As the vibration detection unit 21, for example, various sensors such as a speed sensor, an acceleration sensor, and a vibration sensor can be employed. The vibration detection unit 21 is set with a detection direction X1 in which vibration can be detected, and the vibration detection unit 21 can detect vibration related to the displacement by being displaced in the detection direction X1. It can be done. That is, the vibration detection unit 21 can detect vibration at the installed position.

  The vibration detection unit 21 is attached to the differential unit 14. Specifically, the vibration detection unit 21 passes through the center line C1 of the differential unit 14 (the axis C1 of the propeller shaft 13) and is parallel to the height direction on one side in the width direction (in the present embodiment, the front direction). To the right). More specifically, the vibration detection unit 21 is attached to one end portion in the width direction of the differential portion 14, specifically, an end portion 1412 a on the right wall portion 1416 side of the bottom wall portion 1412 of the main body portion 141 of the differential case 140. ing.

  Further, the vibration detection unit 21 is provided such that the detection direction X1 coincides with the vibration direction of the vibration generated in the differential unit 14 (or the differential unit 14 and the propeller shaft 13). Specifically, the vibration detection unit 21 is attached to the differential unit 14 such that the detection direction X1 is oriented along the height direction of the differential unit 14.

  In the present embodiment, the vibration detection unit 21 is attached to the rear side of the axis C2 of the drive shaft 15, more specifically, to the rear end portion 14a of the differential portion 14, and further below the axis C2. Is attached to the side. Further, the vibration detection unit 21 is attached to the outer surface of the differential case 140.

  As shown in FIG. 2, the vibration damping unit 22 includes a flat plate-like base portion 221, an actuator 222 provided on the base, and a weight 223 supported by the actuator 222. The vibration damping unit 22 vibrates the weight 223 to generate vibration damping, thereby absorbing vibration energy of vibration generated in the differential part 14 (or the differential part 14 and the propeller shaft 13), and thereby the differential part 14 (Or, the vibration generated in the differential portion 14 and the propeller shaft 13) is suppressed. In other words, the damping unit 22 is configured to absorb the vibration energy of the vibration to be damped and to cancel the vibration by applying the damping vibration force to the installation position and applying the damping vibration. Has been. The vibration suppression unit 22 is set with a vibration suppression direction X2 that can suppress vibration, that is, a vibration direction of the vibration suppression vibration to be generated, and the vibration corresponding to the vibration suppression direction X2 is suppressed. Can be done.

  The actuator 222 includes a motor 2221 and a support portion 2222 that vibrates by the driving force of the motor 2221. The motor 2221 is a direct acting type, and is a linear motor in this embodiment. In this motor 2221, a stator 2221 a is provided on the base portion 221, a mover 2221 b is attached to the support portion 2222, and the drive direction X 21 is installed so as to be the thickness direction of the base portion 221. In the present embodiment, the motor 2221 is driven so that the mover 2221b vibrates along the drive direction X21.

  The support portion 2222 is configured to support the weight 223, and vibrates along the driving direction X21 as the mover 2221b of the motor 2221 moves. That is, the support portion 2222 is vibrated by the motor 2221 so as to contact and separate from the base portion 221 along the thickness direction of the base portion 221. Therefore, the weight 223 supported by the support portion 2222 vibrates so as to come in contact with and separate from the base portion 221, and the vibration becomes vibration suppression vibration. In other words, the vibration damping unit 22 is configured to generate vibration damping by causing the actuator 222 to vibrate the weight 223 by applying a vibration damping excitation force.

  The vibration control unit 22 is attached to the differential unit 14. Specifically, the vibration damping unit 22 is attached so as to be displaced in the width direction of the differential unit 14 with respect to the vibration detection unit 21. More specifically, the vibration damping portion 22 passes through the center line C1 of the differential portion 14 (the axis C1 of the propeller shaft 13) and is parallel to the height direction on the other side in the width direction (in this embodiment, the front side). It is mounted on the left side with respect to the direction.

  Further, the vibration damping portion 22 is attached to the front side of the axis C2 of the drive shaft 15, specifically, the front end portion 14b of the differential portion 14, and the position for applying the vibration damping is the same as that of the axis C2. It is attached to be at the same height position. In the present embodiment, the vibration damping portion 22 is attached so that the base portion 221 protrudes radially outward of the connecting portion 142 and on the other side in the width direction, and the actuator 222 and the weight 223 are more than the connecting portion 142. It is attached to the connecting portion 142 so as to be arranged on the other side in the width direction.

  Further, the vibration damping unit 22 is provided such that the vibration damping direction X2 coincides with the vibration direction of the vibration generated in the differential part 14 (or the differential part 14 and the propeller shaft 13). Specifically, the vibration damping part 22 is attached to the differential part 14 such that the vibration damping direction X2 is oriented along the height direction of the differential part 14.

  Therefore, the vibration detection unit 21 and the vibration damping unit 22 are disposed on one side and the other side in the width direction of the differential unit 14 with the axis C1 of the propeller shaft 13 as a boundary, and the axis C2 of the drive shaft 15 is It is arranged on the rear side and the front side as a boundary. In addition, the detection direction X1 of the vibration detection unit 21 and the vibration suppression direction X2 of the vibration suppression unit 22 are in the same direction.

  The control unit 23 calculates the vibration state of the vibration detected by the vibration detection unit 21 based on the detection result of the vibration detection unit 21, and controls the detected vibration based on the calculation result. It is configured to calculate a damping vibration that can be performed and to control the damping unit 22 so that the detected vibration can be controlled by the damping unit 22 based on the calculation result.

  Specifically, the control unit 23 is configured to be able to receive an engine speed related signal output from the ECU 111 and a vibration related signal output from the vibration detection unit 21. Then, when the engine speed-related signal and the vibration-related signal are input, the control unit 23 calculates the vibration state of the vibration that is actually generated based on the engine speed-related signal and the vibration-related signal. . That is, the vibration state of the vibration is calculated by calculating the frequency, amplitude, phase, etc. of the vibration generated in the differential section 14 (or the differential section 14 and the propeller shaft 13). Next, the control unit 23 calculates the frequency, amplitude, phase, etc. of the vibration suppression vibration that can absorb the vibration energy of the vibration, and indicates the calculated frequency, amplitude, phase, etc. of the vibration suppression vibration. The vibration signal is output to the vibration control unit 22. And if the damping part 22 receives the damping command containing a damping signal, it will drive the actuator 222 according to the content of this damping signal, will vibrate the weight 223, and will generate damping vibration. Note that the control unit 23 takes into account the transfer characteristic (phase characteristic) from the vibration damping excitation force for causing the vibration damping generated by the vibration damping unit 22 to the output of the vibration related signal by the vibration detection unit 21. It is also possible to provide phase correction means.

  Next, the damping action of the damping structure 1 and the damping device 20 configured as described above will be described with reference to FIGS. Note that the vibration of the drive system 10 described here has various vibration modes depending on the frequency fluctuation of the power generated from the engine 11. Here, the vibration control structure 1 and the vibration control device 20 control the vibration. The main vibration modes that can be vibrated will be described.

  FIG. 3 shows how the vibration applied to the first vibration mode is suppressed. This first vibration mode is a vibration mode in which both the propeller shaft 13 and the differential portion 14 vibrate in the height direction of the differential portion 14 (vertical direction in FIG. 3), specifically, the propeller shaft 13 and the differential portion 14 Are vibration modes that vibrate by being integrally translated in the height direction of the differential portion 14.

  In this case, since the vibration detection unit 21 is attached to the differential part 14, the vibration detection part 21 is displaced in the height direction of the differential part 14 (that is, the detection direction X <b> 1) in accordance with the vibration of the propeller shaft 13 and the differential part 14. . Thereby, the vibration detection unit 21 detects the vibration state of the vibration applied to the first vibration mode and outputs a vibration-related signal to the control unit 23.

  And the control part 23 to which the vibration related signal was input from the vibration detection part 21 grasps | ascertains the vibration state of the vibration which has generate | occur | produced based on the said vibration related signal and the engine speed related signal received from ECU111, A damping vibration for damping the vibration is calculated, and a damping signal related to the damping vibration is output to the damping unit 22.

  The vibration control unit 22 that has received the vibration control command including the vibration control signal from the control unit 23 is attached to the differential unit 14, and therefore the actuator 222 is driven according to the content of the vibration control signal to control the vibration. A vibration damping excitation force for causing vibration can be applied, whereby the weight 223 vibrates to generate vibration damping, and vibration in the first vibration mode can be suppressed.

  Next, FIG. 4 shows how the vibration applied to the second vibration mode is suppressed. This second vibration mode is a vibration mode in which only the differential part 14 vibrates in the height direction, and specifically, a vibration mode in which only the differential part 14 translates in the height direction of the differential part 14 and vibrates. .

  In this case, since the vibration detection unit 21 is attached to the differential unit 14, the vibration detection unit 21 is displaced in the height direction of the differential unit 14 (that is, the detection direction X <b> 1) with the vibration of the differential unit 14. Thereby, the vibration detection unit 21 detects the vibration state of the vibration applied to the second vibration mode and inputs the vibration related signal to the control unit 23.

  And the control part 23 which received the vibration related signal from the vibration detection part 21 grasps | ascertains the vibration state of the vibration currently generated based on the said vibration related signal and the engine speed related signal received from ECU111, A damping vibration for damping the vibration is calculated, and a damping signal related to the damping vibration is output to the damping unit 22.

  Since the damping unit 22 to which the damping command including the damping signal is input from the control unit 23 is attached to the differential unit 14, the actuator 222 is driven according to the content of the damping signal to control the damping unit. A vibration damping excitation force for causing vibration vibration can be applied, whereby the weight 223 vibrates to generate vibration damping, and vibration in the second vibration mode can be suppressed.

  Next, FIG. 5 shows how the vibration applied to the third vibration mode is suppressed. This third vibration mode is a vibration mode in which the differential portion 14 swings in the height direction of the differential portion 14 about the axis C3 that passes through the connecting portion with the propeller shaft 13 and is parallel to the axis C2 of the drive shaft 15. This is a vibration mode in which the differential portion 14 vibrates like a pendulum in the height direction around an axis C3 parallel to the axis C2 of the drive shaft 15 through the front end portion 14b.

  In this case, since the vibration detection unit 21 is attached to the differential unit 14, the vibration detection unit 21 is displaced in the height direction of the differential unit 14 (that is, the detection direction X <b> 1) as the differential unit 14 is shaken. Accordingly, the vibration detection unit 21 detects the vibration state of the vibration and inputs a vibration related signal to the control unit 23. Here, in this embodiment, since the vibration detection unit 21 is attached to the rear end portion 14a of the differential portion 14, an axis C3 passing through the front end portion 14b of the differential portion 14 and parallel to the axis C2 of the drive shaft 15 is detected. The amount of displacement due to the oscillation at the center increases, and accordingly, the oscillation can be reliably detected.

  And the control part 23 which received the vibration related signal from the vibration detection part 21 grasps | ascertains the vibration state of the vibration currently generated based on the said vibration related signal and the engine speed related signal received from ECU111, A damping vibration for damping the vibration is calculated, and a damping signal related to the damping vibration is output to the damping unit 22.

  The vibration control unit 22 that has received the vibration control command including the vibration control signal from the control unit 23 is attached to the differential unit 14, and therefore the actuator 222 is driven according to the content of the vibration control signal to control the vibration. A vibration damping excitation force for causing vibration can be applied, whereby the weight 223 vibrates to generate vibration damping, and the vibration in the third vibration mode can be suppressed.

  Next, FIG. 6 shows how the vibration applied to the fourth vibration mode is suppressed. In the fourth vibration mode, the connecting portion between the propeller shaft 13 and the differential portion 14 is displaced in the height direction of the differential portion 14, and accordingly, the propeller shaft 13 and the differential portion 14 swing in the height direction. More specifically, the differential portion 14 vibrates like a pendulum in the height direction around the axis C2 of the drive shaft 15, and at the same time, the propeller shaft 13 has the front end portion 131 as a center. This is a vibration mode that vibrates like a pendulum in the vertical direction.

  In this case, the vibration detection unit 21 is attached to the rear end portion 14a of the differential unit 14, that is, the vibration detection position of the vibration detection unit 21 is the center axis of the vibration of the differential unit 14 (that is, the drive shaft 15). Therefore, the displacement of the differential portion 14 in the height direction (that is, the detection direction X1) is caused by the vibration of the differential portion 14 about the axis C2 of the drive shaft 15. To do. Accordingly, the vibration detection unit 21 detects the vibration state of the vibration and inputs a vibration related signal to the control unit 23.

  And the control part 23 which received the vibration related signal from the vibration detection part 21 grasps | ascertains the vibration state of the vibration currently generated based on the said vibration related signal and the engine speed related signal received from ECU111, A damping vibration for damping the vibration is calculated, and a damping signal related to the damping vibration is output to the damping unit 22.

  The vibration control unit 22 that has received the vibration control command including the vibration control signal from the control unit 23 is attached to the differential unit 14, and therefore the actuator 222 is driven according to the content of the vibration control signal to control the vibration. A vibration damping excitation force for causing vibration can be applied, whereby the weight 223 vibrates to generate vibration damping, and the vibration in the fourth vibration mode can be suppressed.

  In the present embodiment, the vibration damping portion 22 is attached to the front end portion 14b of the differential portion 14 in the vicinity of the connecting portion 142 between the differential portion 14 and the propeller shaft 13, that is, the vibration damping portion 22 acts. The point of action of the vibration damping excitation force is arranged in front of the center axis of vibration of the differential portion 14 (that is, the axis C2 of the drive shaft 15), and the point of action is the vibration in the fourth vibration mode. Since it is arranged in a portion with a large amplitude, it can be effectively damped.

  Next, FIG. 7 shows how the vibration applied to the fifth vibration mode is suppressed. The fifth vibration mode is a vibration mode in which the differential portion 14 rotates and vibrates around the axis C <b> 1 of the propeller shaft 13.

  In this case, the vibration detection unit 21 is attached to the differential unit 14, that is, the position of the vibration detection of the vibration detection unit 21 is more differential than the central axis of the rotational vibration of the differential unit 14 (the axis C 1 of the propeller shaft 13). Since it is on one side in the width direction of the portion 14, it is displaced in the height direction of the differential portion 14 (that is, the detection direction X <b> 1) as the differential portion 14 rotates. Thereby, the vibration detection unit 21 detects the vibration state of the rotational vibration and inputs a vibration related signal to the control unit 23. Here, in the present embodiment, since the vibration detection unit 21 is attached to one end portion in the width direction of the differential portion 14, the vibration detection unit 21 is around the axis C <b> 1 of the propeller shaft 13 than in the case where it is attached to the center portion in the width direction. In the rotational vibration, the amount of displacement in the height direction (detection direction X1) becomes large, and therefore the rotational vibration can be reliably detected.

  Then, the control unit 23 to which the vibration related signal is input from the vibration detection unit 21 grasps the vibration state of the currently generated rotational vibration based on the vibration related signal and the engine speed related signal received from the ECU 111. Then, a vibration suppression vibration for suppressing the rotational vibration is calculated, and a vibration suppression signal related to the vibration suppression vibration is transmitted to the vibration suppression unit 22.

  The vibration control unit 22 that has received the vibration control command including the vibration control signal from the control unit 23 is attached to the differential unit 14, and therefore the actuator 222 is driven according to the content of the vibration control signal to control the vibration. A vibration damping excitation force for causing vibration can be applied, whereby the weight 223 vibrates to generate vibration damping, and vibration in the fifth vibration mode can be suppressed.

  In the present embodiment, the vibration damping portion 22 passes through the center line C1 of the differential portion 14 (the axis C1 of the propeller shaft 13) and is parallel to the height direction on the other side in the width direction (in this embodiment, The point of action of the vibration damping excitation force that is attached to the left side with respect to the front direction, that is, acting by the vibration damping part 22 is from the central axis of the rotational vibration of the differential part 14 (axis C1 of the propeller shaft 13). Is also disposed on the other side in the width direction of the differential portion 14 and the action point is disposed in a portion having a large amplitude in the vibration of the fifth vibration mode, so that vibration can be effectively suppressed.

  In addition, when the vibration concerning the said 5th vibration mode has generate | occur | produced, even if the damping part 22 generate | occur | produces the damping vibration and it dampens the said vibration, as shown in FIG. 22, residual vibration in which the differential portion 14 swings around an axis C4 parallel to the axis C1 of the propeller shaft 13 passing through the vicinity of the installation position of the propeller shaft 13, specifically, the differential portion 14 passes through the other end in the width direction and the propeller. There may be a residual vibration that vibrates like a pendulum in the height direction around an axis C4 parallel to the axis C1 of the shaft 13.

  Even in such a case, since the vibration detection unit 21 and the vibration suppression unit 22 are provided in a position shifted in the width direction of the differential unit 14, the vibration detection unit 21 is arranged in the vicinity of the vibration suppression unit 22. Along with the vibration of the differential part 14 around the axis C4, the differential part 14 is displaced in the height direction (that is, the detection direction X1). Thereby, the vibration detection unit 21 detects a vibration state of the vibration and transmits a vibration related signal to the control unit 23.

  Here, in the present embodiment, with the axis C1 of the propeller shaft 13 as a boundary, the vibration detection unit 21 is attached to one end side in the width direction of the differential portion 14, and the vibration suppression portion 22 is the other end side in the width direction of the differential portion 14. In other words, since the vibration detection unit 21 and the vibration suppression unit 22 are provided as far as possible in the width direction, the vibration detection unit 21 is installed at the position where the vibration control unit 22 is installed. In the vibration of the differential portion 14 around the axis C4 in the vicinity, the amount of displacement in the height direction (detection direction X1) becomes large, and therefore the vibration can be reliably detected.

  And the control part 23 which received the vibration related signal from the vibration detection part 21 grasps | ascertains the vibration state of the vibration currently generated based on the said vibration related signal and the engine speed related signal received from ECU111, A damping vibration for damping the vibration is calculated, and a damping signal related to the damping vibration is output to the damping unit 22.

  And since the damping part 22 which received the damping signal from the control part 23 is attached to the differential part 14, in order to drive the actuator 222 according to the content of the said damping signal and to cause damping vibration Therefore, the weight 223 vibrates to generate a vibration damping, and the residual vibration can be controlled.

  As described above, the vibration detection unit 21 and the vibration suppression unit 22 are arranged so as to be able to suppress vibrations and residual vibrations in the first to fifth vibration modes, respectively. Specifically, the arrangement of each of the vibration detection unit 21 and the vibration suppression unit 22 represents a transfer function from the vibration excitation force applied by the vibration suppression unit 22 to the output of the vibration-related signal by the vibration detection unit 21. The arrangement is such that the difference in peak gain between the vibration mode of vibration to be controlled (in the present embodiment, the first to fifth vibration modes) and the vibration mode related to the residual vibration is within 60 dB, preferably 40 dB. If so, the vibration detection unit 21 detects the vibration states of the first and fifth vibration modes and the residual vibration state, and based on the detection result, the control unit 23 controls the vibration control unit 22. As a result, vibrations in any of the vibration modes can be reliably controlled by generating vibration suppression vibrations to absorb vibration energy of the detected vibrations. Vibration according to a plurality of vibration modes of the number regions can be reliably damping.

  In the present embodiment, the case where the power generation unit is an engine that generates power by burning liquid fuel has been described. However, the present invention is not limited to this and may be an electric vehicle.

  Further, in the present embodiment, the case where the vibration generated in the differential portion 14 or the differential portion 14 and the propeller shaft 13 has been described. However, the present invention is not limited to this, and the vibration generated in the other drive system 10 is suppressed. It may be the case.

  Further, in the present embodiment, the case where the vibration detection unit 21 and the vibration suppression unit 22 are disposed on one side and the other side in the width direction of the differential unit 14 with the axis C1 of the propeller shaft 13 as a boundary has been described. However, the present invention is not limited thereto, and for example, either one of the vibration detection unit 21 or the vibration suppression unit 22 may be disposed at the center in the width direction of the differential unit 14. However, it is preferable to arrange the vibration detection unit 21 and the vibration control unit 22 so as to be separated as much as possible in the width direction of the differential unit 14.

  Incidentally, when the vibration detection unit 21 and the vibration suppression unit 22 are arranged so as to coincide with each other in the width direction of the differential unit 14, specifically, the vibration detection unit 21 and the vibration suppression unit 22 are arranged in the height direction. Thus, for example, when the vibration detection unit 21 is provided on the lower surface of the base unit 221 of the vibration suppression unit 22, it is difficult to suppress the residual vibration, but the vibrations in the first to fifth vibration modes are not detected. Each can be controlled. In addition, since the vibration detection unit 21 and the vibration control unit 22 can be integrally formed, the apparatus can be reduced in size.

  Furthermore, in the present embodiment, a case has been described in which power generation of the engine 11 is controlled by the engine control unit (ECU 111) and an engine speed related signal is obtained from the ECU 111. However, the present invention is not limited thereto, and the ECU 111 is not provided. Various signals such as an ignition pulse signal, an ignition current signal, and a crank angle signal can be obtained directly from the engine 11.

  Furthermore, in the present embodiment, the case where the vibration detection unit 21 is provided on the rear side of the axis C2 of the drive shaft 15 has been described. However, the present invention is not limited thereto, and is provided on the front side of the axis C2. It may be the case.

  Moreover, although this embodiment demonstrated the case where the damping part 22 was provided in the front side rather than the axis line C2 of the drive shaft 15, it is not restricted to this but is provided in the back side rather than the said axis line C2. It may be the case.

  Furthermore, in this embodiment, although the vibration detection part 21 and the vibration suppression part 22 demonstrated the case where it arrange | positions in the back side and the front side on the axis line C2 of the drive shaft 15, it is not restricted to this, Both may be arranged on the rear side or the front side of the axis C2.

  Furthermore, in the present embodiment, the case where the vibration detection unit 21 and the vibration suppression unit 22 are provided on the outer surface of the differential case 140 has been described. However, the present invention is not limited to this, and may be provided inside the differential case 140.

It is a figure which shows one Embodiment of the damping structure and damping device which concern on this invention, (A) is a schematic diagram of the front, (B) is a PP sectional view taken on the line (A). It is the schematic which shows the damping part of the damping device. Schematic which shows a mode that the 1st vibration mode of the damping structure is controlled. Schematic which shows a mode that the 2nd vibration mode of the damping structure is controlled. Schematic which shows a mode that the 3rd vibration mode of the damping structure is controlled. Schematic which shows a mode that the 4th vibration mode of the damping structure is controlled. Schematic which shows a mode that the 5th vibration mode of the damping structure is controlled. Schematic which shows a mode that the residual vibration of the damping structure is suppressed. Schematic which shows the conventional 1st vibration mode. Schematic which shows the conventional 2nd vibration mode. Schematic which shows the conventional 3rd vibration mode. Schematic which shows the conventional 4th vibration mode. Schematic which shows the conventional 5th vibration mode.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Vibration control structure, 10 ... Drive system, 11 ... Engine (power generation part), 12 ... Transmission, 13 ... Propeller shaft (transmission part), 14 ... Differential part (transmission part), 15 ... Drive shaft, 16 ... Tire 20, vibration control device 21, vibration detection unit 22, vibration control unit 23, control unit 140, differential case 141, main body unit 142, connection unit 221 base unit, 222 actuator, 223 Weight, 1411 ... Top wall, 1412 ... Bottom wall, 1413 ... Front wall, 1414 ... Rear wall, 1415 ... Left wall, 1416 ... Right wall, 2221 ... Motor, 2221a ... Stator, 2221b ... Movable Child, 2222, supporting portion, X1, detection direction, X2, vibration control direction, X21, driving direction, X22, vibration direction

Claims (4)

A vibration damping structure that is connected to a power generation unit that generates power via a transmission shaft and is formed in a transmitted portion to which power generated from the power generation unit is transmitted via the transmission shaft,
A vibration detection unit capable of detecting at least vibration generated in the transmitted unit when the power generation unit generates power by displacing the vibration by the vibration, a vibration suppression unit capable of damping the vibration, and the vibration detection A control unit that controls the vibration control unit to control the vibration detected by the vibration detection unit based on the detection result of the unit,
A vibration damping structure, wherein the vibration detection unit and the vibration damping unit are provided in the transmitted part, and are displaced in the width direction of the transmitted part.   The vibration detection unit is provided on one side in the width direction of the transmitted part from a plane passing through the axis of the transmission shaft and parallel to the height direction of the transmitted part. Is provided on the other side in the width direction of the transmitted portion.   The vibration detection unit is provided so as to be able to detect the vibration displaced in the height direction of the transmitted portion, and the vibration suppression unit performs vibration suppression vibration for suppressing the vibration. The vibration control direction, which is a vibration direction of the vibration suppression vibration, is configured to be a direction along the height direction of the transmitted portion. Or the vibration control structure of 2. A vibration damping device configured to be connected to a power generation unit that generates power via a transmission shaft and to be provided in a transmitted portion to which power generated from the power generation unit is transmitted via the transmission shaft Because
When the power generation unit generates power, at least vibration generated in the transmitted unit is detected by displacing the vibration by the vibration, a vibration control unit capable of damping the vibration, and the vibration A control unit that controls the vibration suppression unit to suppress the vibration detected by the vibration detection unit based on the detection result of the detection unit;
The vibration detection device, wherein the vibration detection unit and the vibration control unit are configured to be provided in the transmitted unit in a state of being displaced in the width direction of the transmitted unit.

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