JP2009192023A - Vibration control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vibration control device for suppressing the vibration of a case by applying vibration to a vibrating gear to suppress the vibration of the gear. <P>SOLUTION: The vibration control device is provided for suppressing vibration which occurs due to torque transmission between a driving gear consisting of a helical gear 3a and a driven gear 3b meshing with the driving gear. It comprises a piezoelectric element 13 for repetitively thrusting the driving gear 3a or the driven gear 3b in the axial direction, a vibration sensor 18 for detecting the vibration which occurs due to torque transmission between the driving gear 3a and the driven gear 3b, and a controller 21 for controlling a current to be applied to the piezoelectric element 13 to reduce the vibration detected by the vibration sensor 18. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a vibration control device that suppresses vibration generated when power output from a power source is transmitted from an input gear to an output gear, and measures the state of the vibration control device using a sensor. The present invention relates to a vibration control device that controls generated vibrations.

  A gear is known as a general device related to power transmission. In the power transmission by the gear, the input side gear is rotated by the power output from the power source, and the input side gear meshes with the output side gear, so that the power output from the power source is transmitted to the output side gear. Communicated. However, in the power transmission by the gear, due to the gear manufacturing error, the meshing error due to the deflection, etc., the driven gear rotation is delayed with respect to the driving gear rotation, and vibration and noise are generated.

  Patent Document 1 discloses an invention that suppresses gear vibration by transmitting a vibration synchronized with the gear vibration to the gear in a control device that suppresses the gear vibration. In the apparatus described in Patent Document 1, the piezoelectric element piece is a part of the housing, and the piezoelectric element piece is attached to a site where resonance easily occurs. Therefore, when a current is applied to the piezoelectric element piece, the piezoelectric element is vibrated, and this vibration is transmitted to a site where resonance easily occurs. Therefore, the vibration of the resonating part is suppressed.

  Further, vibration to be suppressed is detected by a vibration sensor or the like, and this is electrically processed to generate a vibration voltage to be applied to the piezoelectric element piece. By applying this voltage to the piezoelectric element piece, vibration is generated. An anti-vibration device for suppression is described in Patent Document 2. In the apparatus described in Patent Document 2, the vibration level characteristic with respect to the excitation frequency is measured in advance using the voltage applied to the piezoelectric element as a parameter, the vibration level characteristic data is mapped, and this data is detected. The voltage applied to the piezoelectric element is controlled by comparing the vibration.

JP 2005-344836 A JP-A-5-133435

  In the invention described in Patent Document 1, a piezoelectric element is attached to a housing, and a voltage to be applied to the piezoelectric element is applied based on the detected vibration of the housing. However, the invention described in Patent Document 1 is an invention that focuses on suppressing vibrations of the housing, and is not an invention that focuses on suppressing the occurrence of vibrations in the meshing of gears. For this reason, noise and energy loss caused by the meshing of teeth cannot be sufficiently suppressed.

  In the invention described in Patent Document 2, the vibration level characteristic with respect to the excitation frequency of the structure that is the object to be controlled is measured in advance using the voltage applied to the piezoelectric element as a parameter, and the data of the vibration level characteristic is obtained. By mapping, the applied voltage that provides the lowest vibration level is searched, and the applied voltage to the piezoelectric element is controlled. However, in the invention described in Patent Document 2, since the piezoelectric element is embedded in the transmission case, it is not possible to sufficiently suppress the vibration of the gears and pulleys that are the vibration source.

  On the other hand, vibration occurs when the gears mesh with each other due to the advance or delay of the rotation angle due to the meshing error. Therefore, it is possible to suppress the occurrence of vibration by reducing the advance or delay of the rotation angle by the vibration of the piezoelectric element.

  The present invention has been made paying attention to the above technical problem, and provides a vibration control device that suppresses noise by reducing the advance and delay of the rotation angle due to gear meshing errors by the vibration of the piezoelectric element. It is intended to do.

  In order to achieve the above-mentioned object, the invention according to claim 1 is a vibration that suppresses vibrations caused by transmitting torque between a driving gear composed of a helical gear and a driven gear meshing with the driving gear. In the control device, a piezoelectric element that repeatedly presses the driving gear or the driven gear in the axial direction, a vibration sensor that detects vibration generated by transmitting torque between the driving gear and the driven gear, and the piezoelectric element And a controller for controlling the applied current so as to reduce the vibration detected by the vibration sensor.

  According to a second aspect of the invention, in addition to the configuration of the first aspect, the drive gear and the driven gear constitute a part of a transmission mounted on a vehicle, and the controller is detected by the vibration sensor. The driving state of the vehicle and the rotation angle of each gear when the current is controlled to reduce vibrations, and the driving state including the shift position set in the vehicle and the oil temperature of the transmission are stored. In the same operation state as the stored operation state, the current is controlled to be the same.

  According to the first aspect of the present invention, it is possible to detect vibration generated by transmitting torque between the drive gear and the driven gear. And the vibration which arises between a drive gear and a driven gear can be reduced by controlling the electric current applied to a piezoelectric element with a detection of a vibration with a controller. Therefore, noise due to gear meshing can be reduced.

  According to the second aspect of the present invention, it is possible to store an operation state including a drive torque, a gear rotation angle, a shift position, and an oil temperature when controlling the current applied to the piezoelectric element. Therefore, in the same operating state, the current applied to the piezoelectric element can be controlled to be the same, and the vibration generated between the drive gear and the driven gear can be more effectively reduced. Therefore, noise due to gear meshing can be reduced more effectively.

  Next, the present invention will be described more specifically. FIG. 2 is a schematic diagram of a transmission as an example of a power transmission mechanism that transmits power output from a power source from an input side helical gear to an output side helical gear.

  The external appearance of the transmission 1 includes a case 2a attached to a power source (not shown) and a case 2b attached to the opposite side of the case 2a and having helical gears 3a, 3b and spur gears 4a, 4b. Composed. In the case 2b, an input shaft 6 is connected to an output shaft 5 of an engine (not shown). In the case 2b, a helical gear 3a is formed around the input shaft 6.

  Since the input shaft 6 is supported with respect to the case 2b via the bearing 8, the rotational movement along the axis is possible. In the case 2b, helical gears 3a and 3b are meshed. A helical gear 3 b that meshes with a helical gear 3 a attached to the input shaft 6 is attached to the output shaft 9.

  A spur gear 4 a and a plurality of helical gears 3 a are attached to the input shaft 6. The helical gear 3a and the spur gear 4a attached to the input shaft 6 and the helical gear 3b and the spur gear 4b attached to the output shaft 9 are configured to be paired with each other. . The helical gears 3a and 3b and the spur gears 4a and 4b are configured such that any one of the gears transmits power and the other gears do not transmit power, or neither gear transmits power. It is configured.

  A plurality of gears are attached to the output shaft 9, and one of the gears meshes with the ring gear 11 of the differential case 10 (differential gear device). The output of the differential case 10 is output to the left and right drive shafts 12L and 12R.

  Next, FIG. 3 shows an enlarged sectional view of the gear when the helical gears 3a and 3b are engaged with each other. When the helical gears 3a and 3b mesh with each other, the helical gear 3a attached to the input shaft 6 rotates at a constant speed. On the other hand, when the helical gears 3a and 3b are meshed with each other, a gear meshing error occurs, so that the helical gear 3a attached to the input shaft 6 is attached to the output shaft 9 with respect to the rotation. The rotation of the helical gear 3b may advance or be delayed. This meshing error includes the manufacturing error of the helical gears 3a, 3b, the assembly error between the helical gears 3a, 3b and the shafts 6, 9, and the helical gears 3a, 3b or the shafts 6, 9 It occurs due to the deflection of the machine. And the angular velocity of the helical gear 3b fluctuates by the advance or delay of the rotation of the helical gear 3b. FIG. 4 shows the variation of the angular velocity with respect to the helical gears 3a and 3b.

  Since the meshing error of the helical gears 3a and 3b causes noise, control is performed to reduce the meshing error. Specifically, control is performed to reduce the amplitude of the angular velocity of the helical gear 3a and the helical gear 3b by transmitting vibration generated by applying a current to the piezoelectric element 13 to the helical gear 3a or 3b. Is done.

  As one means for forcibly applying vibration to the helical gears 3a and 3b, a piezoelectric element 13 is attached to a component attached around the gear, and a current is applied to the piezoelectric element 13 to thereby apply the piezoelectric element. There is means for vibrating 13 and transmitting this vibration to the toothed gears 3a and 3b. Specifically, a structure in which the piezoelectric element 13 is attached to the outer peripheral part of the bearing 8 with the input shaft 6 as an axis, or a structure in which the piezoelectric element 13 is attached to the outer peripheral part of the bearing 8 with the output shaft 9 as an axis. .

  In the following description, a structure in which the piezoelectric element 13 is attached to the outer peripheral portion of the bearing 8 with the input shaft 6 as an axis will be described with reference to FIG. Since the piezoelectric element 13 is attached to the outer peripheral portion of the bearing 8 with the input shaft 6 as an axis, when a current is applied to the piezoelectric element 13, the piezoelectric element 13 vibrates and this vibration is transmitted to the input shaft 6. The vibration transmitted to the input shaft 6 is transmitted to the teeth of the helical gear 3a via the helical gear 3a. At this time, since the tooth surface of the helical gear 3 a is oblique to the axial direction of the input shaft 6, the vibration generated from the piezoelectric element 13 and transmitted to the tooth surface is displaced in the rotational direction of the input shaft 6. Is also converted.

  Here, the control for suppressing the amplitude of the angular velocity of the helical gears 3a and 3b will be described below. The phase and amplitude of the angular velocity of the helical gear 3b caused by the meshing error can be estimated by measuring the driving torque generated from the power source and the rotation angle of the gear. The driving torque is measured by using the torque sensor 14 for torque transmitted to the input shaft 6 or by measuring the torque for the helical gears 3 a and 3 b using the torque sensor 14.

  Further, as a parameter for knowing the phase of the angular velocity of the helical gears 3a and 3b, there is an angle of the teeth when the helical gears 3a and 3b are rotationally moved. The tooth angle is measured with reference to a line connecting the pitch point and the center of the gear, and corresponds to the tooth angle of the helical gears 3a and 3b. The angle of the teeth of the helical gears 3 a and 3 b is measured by the angle sensor 15. The angle sensor 15 may be either a sensor that contacts the gear or a sensor that does not contact the gear.

  Further, as one of the parameters for knowing the frequency and amplitude of the angular velocity related to the vibrations of the helical gears 3a and 3b, the shift by the combination of the helical gears 3a and 3b attached to the input shaft 6 and the output shaft 9 is performed. There is a ratio. This gear ratio is determined by selecting the meshing helical gears 3a and 3b with a shift lever (not shown). The shift lever 16 can select a traveling position where the driving force generated from a power generation device such as an engine or a motor can be transmitted and a non-traveling position where the transmission of the driving force is not transmitted. . The gear ratio can be known by measuring the shift position of the shift lever 16 using the shift position sensor 17. In addition, the vibrations of the cases 2a and 2b are measured by the vibration sensor 18, so that the vibration states of the cases 2a and 2b can be known.

  As one of the physical quantities for knowing the amplitude of the angular velocity of the helical gears 3a and 3b, there is the temperature of the oil filled in the sliding surfaces of the helical gears 3a and 3b. Is measured by the temperature sensor 20. The temperature sensor 20 is a known sensor such as a thermistor.

  From the torque sensor 14, the angle sensor 15, the engine speed sensor 7, the shift position sensor 17, and the temperature sensor 20 described above, the frequency, amplitude, and phase of the angular speeds of the helical gears 3a and 3b can be obtained. Specifically, as shown in FIG. 5, the measured values of the sensors 14, 15, 17, and 20 are taken into the electronic control unit (ECU) 21 and the frequency of the angular speeds of the helical gears 3 a and 3 b. And phase and amplitude are required. The ECU 21 functions as the controller 21 and controls the current applied to the piezoelectric element 13 based on the measured values from the sensors 14, 15, 17, and 20. The frequency (Hz) of the angular velocity is calculated from the engine speed and the drive gear. The phase is obtained from a gear angle sensor. The vibration is measured by the vibration sensor 18 and obtained. Then, the ECU 21 determines the voltage to be applied to the piezoelectric element 13 from the calculated angular velocity, amplitude, phase, and vibration of the cases 2 a and 2 b measured by the vibration sensor 18. The vibration generated by the piezoelectric element 13 is transmitted to the helical gear 3a through the input shaft 6.

  Here, the teeth of the helical gears 3 a and 3 b are inclined with respect to the input shaft 6 and the output shaft 9. Therefore, by shifting the phase of the vibration caused by the tooth meshing error and the phase of the vibration transmitted from the piezoelectric element 13 to the helical gear 3a and converted to the rotation direction by 180 degrees, the mutual vibrations overlap each other, Amplitude decreases. Specifically, the vibration generated by the piezoelectric element 13 is transmitted to the helical gear 3a, so that the vibration generated by the piezoelectric element 13 overlaps with the vibration generated by the meshing error of the tooth surface. Vibration caused by tooth surface meshing errors is reduced. Therefore, the vibration transmitted from the helical gears 3a and 3b to the cases 2a and 2b is suppressed, and the vibrations of the cases 2a and 2b can be suppressed.

  At this time, the voltage applied to the piezoelectric element 13 and the measured values measured by the sensors 14, 15, 17, 18, and 20 are stored in the ECU 21. In the case of each measurement value that is the same as the stored measurement value, the same voltage is applied to the piezoelectric element 13.

  Next, as a second specific example, a vibration control device that suppresses vibrations of the helical gears 3a and 3b using torque estimation means instead of the torque sensor 14 will be described. Since the first specific example is common to points other than the torque sensor 14, the same reference numerals are given and description thereof is omitted.

  As described above, the frequency, amplitude, and phase of the angular speeds of the helical gears 3a and 3b can be obtained from the torque estimation means, the angle sensor 15, the engine speed sensor 7, the shift position sensor 17, and the temperature sensor 20. . Specifically, the measured values of the sensors 15, 17 and 20 and the torque estimated by the torque estimating means 22 are taken into the ECU 21, and the angular velocities and amplitudes of the helical gears 3a and 3b are estimated. The frequency (Hz) of the angular velocity is calculated from the engine speed and the drive gear. The phase is obtained from a gear angle sensor. The vibration is measured by the vibration sensor 18 and obtained. Then, the ECU 21 determines the voltage to be applied to the piezoelectric element 13 from the calculated angular velocity, amplitude, phase, and vibration of the cases 2 a and 2 b measured by the vibration sensor 18. Then, a voltage is applied to the piezoelectric element 13 based on the obtained voltage, and vibration generated by this application is transmitted to the helical gear 3a via the input shaft 6.

  At this time, the voltage applied to the piezoelectric element 13, the measured values measured by the sensors 15, 17, 18, and 20 and the torque estimated by the torque estimating means 22 are stored in the ECU 21. In the case of each measurement value that is the same as the stored measurement value, the same voltage is applied to the piezoelectric element 13.

  Next, another example is shown as a third specific example. This schematic diagram is shown in FIG. Since it is common to the first specific example except for the attachment of the piezoelectric element 13, the same reference numerals are given and the description thereof is omitted.

  FIG. 6 shows a structure in which the piezoelectric element 13 is attached to the helical gear 3a. At this time, the piezoelectric element 13 is attached to the toothless surface of the helical gear 3a. At this time, the piezoelectric element 13 may be attached to the gear on one side or both sides. By directly attaching the piezoelectric element 13 to the helical gear 3a, the transmission efficiency of vibration transmitted to the tooth surface is improved. In addition, since the piezoelectric element 13 is directly attached to the helical gear 3a, a slip ring 23 is required for electrical connection with a fixed power source. The slip ring 23 is attached so as to be laminated with the piezoelectric element 13, and is attached so that the piezoelectric element 13 is sandwiched between the gear and the slip ring 23.

  In the third specific example, the driving torque used for the control of the controller uses either the driving torque detected by the torque sensor 14 or the estimated value of the driving torque by the torque estimating means. Also good.

  With respect to the first to third examples, the vibration generated by applying a current to the piezoelectric element 13 is transmitted to the helical gear 3a attached to the input shaft 6, whereby the helical gear 3a. , 3b and the case 2a, 2b are described to suppress vibration. In this specific example, vibration generated by applying a current to the piezoelectric element 13 is transmitted to the helical gear 3b attached to the output shaft 9, whereby the helical gears 3a, 3b and the cases 2a, 2b are connected. Similar effects can be obtained even when vibration is suppressed.

  At this time, since the vibration generated by the piezoelectric element 13 is transmitted to the helical gear 3b, the vibration generated by the piezoelectric element 13 and the vibration generated by the meshing error of the tooth surface overlap each other. The vibration caused by the meshing error is reduced. Therefore, the vibration transmitted from the helical gears 3a and 3b to the cases 2a and 2b is suppressed, and the vibrations of the cases 2a and 2b can be suppressed.

It is a figure which shows roughly the example which attached this vibration control apparatus. It is a figure which shows roughly an example which used this vibration control apparatus for the transmission. It is a figure showing the enlarged part at the time of the tooth surface of gears meshing | engaging. It is a figure which shows the relationship between the angular velocity of a tooth surface, and time. It is a block diagram which shows the relationship between an electronic controller, each sensor, and a piezoelectric element. It is a figure which shows roughly the other example which attached this vibration control apparatus.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Transmission, 2a, 2b ... Case, 3a, 3b ... Helical gear, 6 ... Input shaft, 7 ... Engine speed sensor, 8 ... Bearing, 9 ... Output shaft, 10 ... Differential case, 13 ... Piezoelectric element, DESCRIPTION OF SYMBOLS 14 ... Torque sensor, 15 ... Angle sensor, 17 ... Shift position sensor, 18 ... Vibration sensor, 20 ... Temperature sensor, 21 ... Electronic control unit (ECU), 23 ... Slip ring.

Claims (2)

In a vibration control device that suppresses vibration associated with transmitting torque between a drive gear formed of a helical gear and a driven gear meshing with the drive gear,
A piezoelectric element that repeatedly presses the drive gear or the driven gear in the axial direction;
A vibration sensor that detects vibration generated by transmitting torque between the drive gear and the driven gear;
A vibration control apparatus comprising: a controller that controls a current applied to the piezoelectric element so that vibration detected by the vibration sensor is reduced. The drive gear and the driven gear constitute a part of the transmission mounted on the vehicle,
The controller includes a driving torque of the vehicle and a rotation angle of each gear when the current is controlled so that vibration detected by the vibration sensor is reduced, a shift position set in the vehicle, and the transmission. The vibration control device according to claim 1, wherein the vibration control device is configured to store an operation state including the oil temperature of the oil and to control the current in the same operation state as the stored operation state.

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