JP5494026B2 - Pendulum dynamic damper - Google Patents

Description

  The present invention relates to a pendulum dynamic damper that is attached to a rotating member and absorbs or attenuates rotational fluctuation or torsional vibration.

  It is known that rotating members such as a crankshaft of a vehicle engine and an input shaft or a drive shaft of a transmission cause inherent torsional vibrations around the shaft center due to an excitation force from the engine. . In order to suppress the resonance between the torsional vibration and the cycle of the explosion rotation speed of the cylinder of the engine, a dynamic damper is known which is attached to a rotating member as described above and absorbs or attenuates the torsional vibration. An example of such a dynamic damper is described in Patent Document 1. The pendulum dynamic damper described in Patent Document 1 includes a disk attached to an end of a rotating shaft that rotates in proportion to the rotational speed of the engine, and a set of pendulum mechanisms housed in the disk. And a moving mechanism for moving the vibration fulcrum of the pendulum mechanism in the radial direction of the disk. The moving mechanism includes a cylinder, a piston, and a return spring, and a pendulum is rotatably supported by the piston. Then, hydraulic oil is supplied to the cylinder according to the engine speed, and the piston is moved in the radial direction of the disk against the urging force of the return spring, thereby changing the vibration fulcrum of the pendulum, that is, the pendulum It is configured to change the pendulum fulcrum radius. Therefore, by changing the vibration fulcrum of the pendulum according to the engine speed, an arbitrary torsional vibration order of the rotating shaft generated according to the engine speed can be reduced.

  Patent Document 2 discloses a first flywheel that is integrally connected to an output side end portion of an engine crankshaft and is rotatably supported via a bearing at the output end portion of the crankshaft. And a second flywheel having the other magnet part is described. And it describes that torsional rigidity and torsional damping characteristics between the first flywheel and the second flywheel are controlled by variably controlling the magnetic force between one magnet part and the other magnet part. Yes.

  Furthermore, in Patent Document 3, a main flywheel that is always driven to rotate by the output shaft of the engine, a sub flywheel that can be engaged with and disengaged from the output shaft, means for switching all-cylinder operation or reduced-cylinder operation of the engine, A device is described that includes means for engaging / disengaging the sub flywheel with respect to the output shaft in accordance with switching of the operating state of the engine. Then, according to switching of the operating state of the engine, that is, by engaging / disengaging the sub flywheel with respect to the output shaft according to the number of used cylinders, vibration that varies according to the number of used cylinders can be reduced. Have been described.

  In Patent Document 4, the main body of the rotating member is provided with a mass body that performs a pendulum motion about an axis that is separated from the rotation center axis of the rotation member by a predetermined interval and parallel to the rotation center axis. It is described that the torsional vibration order of the rotating member is absorbed or attenuated by making the reciprocating motion order of the mass body equal to the rotational fluctuation order of the rotating member.

JP 10-196732 A JP 2009-168074 A JP-A 61-149648 JP 2002-340097 A

  As described in Patent Document 1 above, if the pendulum fulcrum radius of the pendulum is changed according to the engine speed, a set of torsional vibration components of an arbitrary order of the rotating shaft generated according to the speed is set. It can be reduced by a pendulum mechanism. The technique described in Patent Document 1 is a technique for reducing a torsional vibration component of an arbitrary order by fixing the pendulum length and changing the pendulum fulcrum radius according to the engine speed. In other words, in the configuration described in Patent Document 1, when the number of cylinders used in the engine is constant, the pendulum fulcrum radius is changed in accordance with the increase or decrease of the engine speed, and thus the engine speed is changed. Any vibration order generated can be reduced. However, for example, when the number of cylinders used in the engine changes and a large vibration order occurs, in other words, the engine operating state is switched from full cylinder operation to reduced cylinder operation, resulting in a certain large vibration order. In some cases, since the moving distance of the pendulum is short, the changed vibration order may not be reduced. That is, in the configuration described in Patent Document 1, only the pendulum fulcrum radius, which is the distance between the center of rotation of the disk and the pendulum fulcrum, is changed, and the pendulum length is not adjusted. If this happens, there is a possibility that it cannot be handled, and there is still room for improvement.

  Moreover, the technique described in Patent Document 2 is a dual mass type flywheel in which the magnetic force of one magnet unit provided in the first flywheel and the magnetic force of the other magnet unit provided in the second flywheel are This is a technique for avoiding a resonance point by generating an appropriate torsional rigidity between these flywheels even when a sudden change in input rotation occurs by variably controlling. Furthermore, the technique described in Patent Document 3 is such that the sub flywheel is engaged with or disengaged from the output shaft in accordance with all-cylinder operation or reduced-cylinder operation of the engine. This is a technique for reducing the vibration order that changes in accordance with the number of cylinders used.

  In other words, the devices described in Patent Documents 2 and 3 described above correspond to a plurality of vibration orders of the object to be controlled by engaging or disengaging the second flywheel or the sub flywheel from the output shaft. It is configured to be able to. However, the devices described in Patent Documents 2 and 3 above can cope with a plurality of vibration orders of the object to be controlled, but require a second flywheel or a secondary flywheel, which increases the size of the device to some extent. There is a possibility of requiring a large installation space or increasing the mass of the apparatus, and there is still room for improvement.

  In the technique described in Patent Document 4, the reciprocal vibration order of the pendulum is matched with the vibration order of the vibration suppression object, so that the vibration order of the vibration suppression object, that is, the torsional vibration order is absorbed or attenuated. Technology.

  As described above, conventionally, there is no function for changing the vibration order of one pendulum to a certain extent, and there is still room for improvement in order to cope with a large change in vibration order of the object to be controlled by the pendulum dynamic damper. was there.

  The present invention has been made paying attention to the above technical problem, and by adjusting the pendulum length of the pendulum according to the rotational fluctuation order of the rotating member, a plurality of pendulum vibration orders are set for one pendulum. Thus, it is an object of the present invention to provide a pendulum dynamic damper that can cope with a change in the rotational fluctuation order of the rotating member to a certain extent.

In order to achieve the above object, the invention of claim 1 is directed to a pendulum type dynamic damper in which a rotating member rotated by an engine is provided with a pendulum that swings according to a rotational fluctuation of the rotating member. The position of the swing center of the pendulum is changed in accordance with the change in the rotational fluctuation order of the rotating member to adjust the distance from the rotation center of the rotating member to the swing center of the pendulum and the pendulum length of the pendulum. comprising a pendulum length adjusting mechanism, the pendulum is provided with a two shaft members and two links, the pendulum is swingably connected to the rotating member by one of the links provided on one of the shaft member , the other link, as the shaft member of the other side in a direction different direction in which the one shaft member said by one link is swung relative to the rotating member to swing relative to the shaft member of the one The are other side of the shaft member is connected to the shaft member of the one Te, the pendulum length adjusting mechanism is rotated about the axis of the shaft member in accordance with the pendulum rotational fluctuation order of change of the rotating member By adjusting the length of the pendulum, the pendulum swings in parallel with the rotation surface of the rotating member around any link as a swing center. is there.

According to a second aspect of the present invention, in the first aspect of the invention, the pendulum length adjusting mechanism includes a plurality of gears via a gear mechanism that is integrally rotatable with the rotating member and is provided on a rotation center axis of the rotating member. The pendulum length adjusting mechanism includes a mechanism to which the pendulum is connected, and the pendulum length adjusting mechanism moves any of the plurality of pendulums around the axis of the shaft member via the gear mechanism according to a change in the rotational fluctuation order of the rotating member. A pendulum type dynamic damper, wherein the pendulum length is adjusted so that any one of the plurality of pendulums swings in parallel with the rotation surface of the rotating member. is there.

The invention according to claim 3, in the invention of claim 1 or 2, wherein the pendulum length adjustment mechanism, in response to said rotational fluctuation orders of change in the rotational member, rotating the pendulum about the axis of said shaft member A pendulum type dynamic damper including an actuator to be operated.

According to a fourth aspect of the present invention, in the third aspect of the invention, the cylinder number switching detecting means for detecting that the operating state of the engine is switched from the full cylinder operation to the reduced cylinder operation or from the reduced cylinder operation to the full cylinder operation. And the cylinder number switching detection means detects that the operating state of the engine is switched from the all-cylinder operation to the reduced-cylinder operation or from the reduced-cylinder operation to the all-cylinder operation. After the number of the pendulums is rotated around the axis of the shaft member and the pendulum length of the plurality of pendulums is adjusted in the transient control state of the engine for switching the number, An actuator that controls the actuator so as to adjust the pendulum length of any one of the plurality of other pendulums by rotating the pendulum of the shaft member around an axis of the shaft member It is pendulum dynamic damper according to claim which comprises a control means.

  According to the first aspect of the present invention, the pendulum length of the pendulum is adjusted according to the rotational fluctuation order of the rotating member. In other words, the pendulum vibration order of the pendulum is changed according to the rotational fluctuation order of the rotating member. That is, a plurality of pendulum vibration orders can be set for one pendulum by adjusting the pendulum length of the pendulum. As a result, a plurality of rotational fluctuation orders of the rotating member can be absorbed or attenuated by one pendulum.

Further, the swinging direction of the pendulum by the other link is different from the swinging direction of the pendulum by the one link. Therefore, the pendulum length of the pendulum swinging in parallel with the rotation surface of the rotating member can be adjusted by rotating the pendulum around the axis of the shaft member according to the rotational fluctuation order of the rotating member. That is, a plurality of pendulum vibration orders can be set for one pendulum by adjusting the pendulum length of the pendulum according to the rotational fluctuation order of the rotating member. As a result, a plurality of rotational fluctuation orders of the rotating member can be absorbed or attenuated by one pendulum.

According to the invention of claim 2, in addition to the effect similar to the effect of the invention of claim 1 , the pendulum length adjusting mechanism includes a plurality of pendulums via a gear mechanism provided on the rotation center axis of the rotating member. Includes a mechanism connected to the. Therefore, when a change occurs in the rotational fluctuation order of the rotating member, the pendulum length of any of the plurality of pendulums can be adjusted by rotating any of the plurality of pendulums using the pendulum length adjusting mechanism. Yes. That is, the pendulum vibration orders of a plurality of pendulums can be changed simultaneously, or a plurality of pendulum vibration orders can be mixed as a whole. Therefore, for example, when a plurality of rotational fluctuation orders are mixed in the rotating member, the pendulum vibration order of the pendulum can be set for each of the mixed rotational fluctuation orders. That is, a plurality of different rotational fluctuation orders can be absorbed or attenuated. In addition, since the pendulum lengths of a plurality of pendulums can be adjusted simultaneously, the number of parts can be reduced. Furthermore, the reduction in the number of parts can suppress an increase in the size of the apparatus and an increase in mass. Further, the pendulum length adjusting mechanism is provided so as to be integrally rotatable with the rotating member and on the rotation center axis of the rotating member. Therefore, the moment of inertia generated in the pendulum length adjusting mechanism can be reduced as compared with the case where the pendulum length adjusting mechanism is provided on the outer peripheral edge side of the rotating member. Moreover, it can suppress that an excessive moment of inertia arises in a pendulum length adjustment mechanism.

According to the invention of claim 3, in addition to the same effect as that of the invention of claim 1 or 2 , the pendulum is rotated around the axis of the shaft member by the actuator. As the actuator, it is only necessary to rotate the pendulum around the axis of the shaft member. Therefore, an actuator having a simple configuration can be used.

According to the invention of claim 4, in addition to the same effect as that of the invention of claim 3 , it is possible to switch the engine operating state from all-cylinder operation to reduced-cylinder operation or from reduced-cylinder operation to all-cylinder operation. When detected, in the transient control state of switching the operating state of the engine whose number of used cylinders is changed, first, any of the plurality of pendulums is rotated to adjust the pendulum length of those pendulums . Next, the pendulum length of any other plurality of pendulums is adjusted. That is, by changing the vibration order of the pendulum in stages, a plurality of different pendulum vibration orders can be set and mixed. As a result, when the number of cylinders used in the engine is changed, the rotational fluctuation order of the rotating member changes, and when a plurality of rotational fluctuation orders coexist, the pendulum dynamic damper according to the present invention has its pendulum vibration. By changing the order stepwise, the plurality of rotational fluctuation orders can be absorbed or attenuated. In other words, by changing the pendulum vibration order stepwise as a whole, instantaneous torsional vibration and noise increase of the rotating member in the above transient control state are suppressed, and so-called smooth switching of the number of cylinders used is performed. be able to.

It is a case where the pendulum type dynamic damper concerning this invention is a case where it is applied to a rotation member, and is a figure showing typically the state where the pendulum vibration order was made to correspond to a relatively low rotation fluctuation order. It is a case where the pendulum type dynamic damper concerning this invention is a case where it is applied to a rotation member, and is a figure showing typically the state where the pendulum vibration order was made to correspond to a relatively high rotation fluctuation order. It is a figure which shows typically the example which improved the structure shown in FIG. 1 and FIG. 2 mentioned above. 4 is a flowchart showing an example of pendulum vibration order switching control in the apparatus shown in FIGS. 1, 2, and 3.

  Next, the present invention will be described more specifically. The present invention is a pendulum type that is attached to a rotating member and performs a pendulum motion with the rotational fluctuation of the rotating member, and absorbs or attenuates the rotational fluctuation order of the rotating member or the torsional vibration order caused by the pendulum vibration order. It relates to dynamic dampers. Therefore, the rotating member is a crankshaft of an engine mounted on a vehicle, an input shaft or a drive shaft of a transmission, or the like, and a member attached so as to rotate integrally therewith. In this invention, the pendulum is provided on the rotating member described above, and the pendulum length is adjusted according to the rotational fluctuation order of the rotating member input to the pendulum. Specifically, the pendulum includes at least two shaft members and at least two links, and is connected to the rotating member by one link provided on one shaft member. The other shaft member is connected to one shaft member by the other link. Accordingly, the pendulum moves in a pendulum manner with the rotational fluctuation of the rotating member or the torsional vibration caused by the rotation using one link or the other link as a vibration fulcrum.

  In the pendulum, the swinging direction of the pendulum using the one link as a vibration fulcrum is orthogonal to the swinging direction of the pendulum using the other link as a vibration fulcrum. Also, when one link is used as a vibration fulcrum and the pendulum vibration order is swung in parallel with the rotation surface of the rotating member, and when the other link is used as a vibration fulcrum and the link is swung in parallel with the rotation surface of the rotating member The pendulum vibration order is different. That is, the pendulum length of the pendulum with one link or the other link as a vibration fulcrum is different. The pendulum is intended to absorb or attenuate the rotational fluctuation order of the rotating member or the torsional vibration order resulting from the pendulum vibration order. Therefore, the pendulum vibration order that varies depending on the pendulum length is to be absorbed or attenuated. It is designed to be equal to a plurality of rotational fluctuation orders of the rotating member.

  In the present invention, a pendulum length adjusting mechanism is provided that adjusts the pendulum length of the pendulum according to the rotational fluctuation order of the rotating member. The pendulum length adjustment mechanism changes the vibration fulcrum at which the pendulum swings in parallel to the rotation surface of the rotating member by rotating the pendulum about the axis of the shaft member, that is, adjusts the pendulum length. It is configured as follows. Specifically, the pendulum length adjusting mechanism is configured to rotate the pendulum by a predetermined angle around the axis of the shaft member according to the rotational fluctuation order of the rotating member when the rotational variation occurs in the rotating member. Switching between the vibration of the pendulum swinging in parallel with the rotation surface of the rotating member using the other link as the vibration fulcrum and the vibration of the pendulum swinging in parallel with the rotation surface of the rotating member using the other link as the vibration fulcrum It is like that.

  In short, the pendulum length adjusting mechanism rotates the pendulum in parallel with the rotating surface of the rotating member by rotating the pendulum by a predetermined angle around the axis of the shaft member in accordance with the rotational fluctuation order of the rotating member. What is necessary is just to be comprised so that the vibration fulcrum to change may be changed and the pendulum length may be adjusted. In other words, the pendulum length adjusting mechanism responds to the rotational fluctuation order so that the swinging direction of the pendulum with the one link or the other link as a vibration fulcrum is parallel to the rotation surface of the rotating member. Thus, the pendulum may be configured to rotate a predetermined angle around the axis of the shaft member and thereby adjust the pendulum length. Therefore, in this invention, the pendulum length adjusting mechanism may be an actuator that rotates the pendulum by a predetermined angle around the axis of the shaft member.

  One actuator may be provided for each pendulum, or by connecting a plurality of pendulums to one actuator, the pendulum length of the plurality of pendulums may be adjusted simultaneously by one actuator. Good. More specifically, when adjusting the vibration fulcrum of a plurality of pendulums, that is, the pendulum length by one actuator, the actuator is provided on the rotation center axis of the rotating member, and the actuator and the plurality of pendulums are, for example, bulky. By connecting with a gear-shaped gear mechanism, a plurality of pendulums may be rotated simultaneously and their pendulum lengths may be adjusted simultaneously.

  The predetermined rotation angle by which the pendulum is rotated by the actuator described above is, for example, when the swinging direction of the pendulum swinging with one link as a vibration fulcrum is parallel to the rotation surface of the rotating member. The rotation angle may be a rotation angle at which the swinging direction of the pendulum swinging with the other link as a vibration fulcrum is parallel to the rotating surface of the rotating member. In other words, the actuator can rotate the pendulum around the axis of the shaft member so that the swinging direction of the pendulum with the one link or the other link as the vibration fulcrum is parallel to the rotation surface of the rotating member. That's fine. Therefore, the actuator may be configured to rotate the pendulum by 90 ° around the axis of the shaft member, for example.

  Furthermore, in the present invention, the cylinder number switching means for detecting the switching between the full cylinder operation and the reduced cylinder operation of the engine described above, and the transient state in which the switching of the number of used cylinders of the engine is detected and the number of used cylinders is switched. The actuator control means controls the adjustment of the pendulum lengths of the plurality of pendulums simultaneously by controlling the driving of the actuator described above. More specifically, when it is detected by the cylinder number switching detection means that the engine operating state is switched from all-cylinder operation to reduced-cylinder operation, or from reduced-cylinder operation to all-cylinder operation, a transition that switches the number of used cylinders is performed. In the control state, any one of a plurality of pendulums is first rotated by the actuator control means, and the pendulum length of the pendulum is adjusted. Then, after the pendulum length of any of the plurality of pendulums is adjusted, the pendulum length of any of the other plurality of pendulums is adjusted. That is, in a transient control state in which the number of cylinders used in the engine is switched, in other words, in a state where the rotational fluctuation order of the rotating member changes and a relatively high rotational fluctuation order and a relatively low rotational fluctuation order are mixed. The pendulum dynamic damper according to the present invention can mix a plurality of different pendulum vibration orders by changing the pendulum vibration order of the pendulum stepwise.

  Therefore, in the pendulum type dynamic damper having such a configuration, the pendulum is rotated around the axis of the shaft member in accordance with the rotational fluctuation order of the rotating member, thereby changing the vibration fulcrum of the pendulum, and changing the pendulum length. Can be adjusted. Specifically, by controlling the rotation of the pendulum about the axis of the pendulum by the actuator according to the rotational fluctuation order of the rotating member, the pendulum motion parallel to the rotating surface of the rotating member with one link as a vibration fulcrum The pendulum motion parallel to the rotation surface of the rotating member with the other link as a vibration fulcrum can be switched. As a result, a plurality of pendulum vibration orders can be set for one pendulum. The plurality of pendulum vibration orders are set to be equal to the plurality of rotational fluctuation orders to be absorbed or attenuated. Therefore, since a plurality of pendulum vibration orders can be set for one pendulum, a plurality of rotational fluctuation orders or torsional vibration orders can be absorbed or attenuated by one pendulum by adjusting the pendulum length of the pendulum.

  Furthermore, according to the present invention, in the above-described transient control state in which a relatively high rotational fluctuation order and a relatively low rotational fluctuation order are mixed, the rotational fluctuation orders are switched by stepwise switching the pendulum vibration order. Can be absorbed or attenuated. That is, by changing the pendulum vibration order stepwise, the instantaneous torsional vibration and noise increase of the rotating member in the transient control state described above can be suppressed. Also, by changing the pendulum vibration order in steps, for example, when switching the engine operating state from full cylinder operation to reduced cylinder operation, or from reduced cylinder operation to full cylinder operation, so-called smooth switching of the number of cylinders used Can be done.

  FIG. 1 schematically shows a state in which the pendulum dynamic damper according to the present invention is applied to a rotating member, and the pendulum vibration order corresponds to a relatively low rotational fluctuation order. FIG. 1 shows a state in which one pendulum dynamic damper 1 is viewed from a direction perpendicular to the rotation surface 2a of the rotating member 2 to which the pendulum dynamic damper 1 is attached. The pendulum type dynamic damper 1 includes, for example, a rotating member 2 that is attached to a crankshaft of an engine of a vehicle, an input shaft or a drive shaft of a transmission, and the like inside the rotating member 2. The main components are a pendulum housing chamber 3 formed in a hollow cylindrical shape, a pendulum 4 housed in the pendulum housing chamber 3 and held so as to be swingable, and an actuator 5 that holds the pendulum 4 and rotates it in a predetermined direction. It is configured as a simple component.

  The pendulum 4 includes at least two shaft members 6 and 7, at least two links 8 and 9, and a mass body 10 having a predetermined mass, and is connected to the actuator 5 by the link 8. Further, the pendulum 4 can swing about the link 8 as a vibration fulcrum, for example.

  Specifically, one end of the shaft member 6 is connected to the rotating shaft 5a of the actuator 5 so as to be swingable with the link 8 as a vibration fulcrum. One end of the shaft member 7 is connected to the other end of the shaft member 6 so as to be swingable with the link 9 as a vibration fulcrum. A mass body 10 having a predetermined mass is integrally provided at the other end of the shaft member 7. Further, the swinging direction of the pendulum 4 using the link 8 as a vibration fulcrum is perpendicular to the swinging direction of the pendulum 4 using the link 9 as a vibration fulcrum. That is, the phase of the link 8 and the phase of the link 9 are different. Further, the pendulum vibration orders of the pendulum with the link 8 or the link 9 as the vibration fulcrum are different from each other. That is, the pendulum length of the pendulum with the link 8 or the link 9 as a vibration fulcrum is different.

  The actuator 5 is provided on the rotation center 2 b side of the rotation member 2 in the pendulum accommodation chamber 3. The actuator 5 is a member that holds the pendulum 4 in a swingable manner and rotates the pendulum 4 by a predetermined angle around the axis of the shaft members 6 and 7, for example, a stepping motor (sometimes called a pulse motor). Can be used. The predetermined rotation angle is such that the swinging direction of the pendulum 4 with the link 8 or the link 9 as a vibration fulcrum is parallel to the rotating surface 2a of the rotating member 2, that is, the pendulum of the pendulum dynamic damper 1 This is the angle at which the pendulum 4 is rotated around the axis of the shaft members 6 and 7 so that the vibration order is switched from one order to another. Specifically, the actuator 5 rotates the pendulum 4 around the axis of the shaft members 6 and 7 by 90 °, for example, according to the rotational fluctuation order of the rotating member 2. Therefore, the actuator 5 corresponds to the pendulum length adjusting mechanism of the present invention.

In the above-described structure, by rotating the actuator 5 a pendulum 4 around the axis of the shaft member 6, 7 in response to the rotation fluctuation degree of the rotary member 2 to be absorbed or attenuated, against the rotating surface 2a of the rotary member 2 The vibration fulcrum at which the pendulum 4 vibrates in parallel is switched to the link 8 or the link 9, that is, the pendulum length is adjusted. In other words, the pendulum dynamic damper 1 according to the present invention absorbs or absorbs by controlling the rotation angle of the pendulum 4 by the actuator 5 according to the rotational fluctuation order, that is, by adjusting the pendulum length of the pendulum 4. A pendulum vibration order equal to the rotational fluctuation order of the rotating member 2 to be damped is set.

  In the state shown in FIG. 1, the pendulum dynamic damper 1 has the pendulum 4 rotated by the actuator 5 and the rotation angle thereof is controlled so that the swinging direction with the link 8 as the vibration fulcrum is the rotation member 2. It is in a state of being parallel or substantially parallel to the rotating surface 2a. In this state, the pendulum vibration order of the pendulum dynamic damper 1 is such that the pendulum length of the pendulum 4 is relatively long, so that the rotation speed of the rotating member is relatively high, or the engine is operated in a reduced cylinder. Is set so as to correspond to a so-called relatively low rotational fluctuation order.

  FIG. 2 schematically shows a state in which the pendulum dynamic damper according to the present invention is applied to a rotating member and the pendulum vibration order corresponds to a relatively high rotational fluctuation order. In FIG. 2, the pendulum type dynamic damper 1 is such that the pendulum 4 is rotated by the actuator 5 so that the swinging direction with the link 9 as a vibration fulcrum is parallel or substantially parallel to the rotating surface 2 a of the rotating member 2. It has become. In this state, the pendulum vibration order of the pendulum type dynamic damper 1 is such that the pendulum length of the pendulum 4 is relatively short, so that the rotation speed of the rotating member is relatively low, or the engine operates in all cylinders. Is set so as to correspond to a so-called relatively high rotational fluctuation order.

Thus, in the configuration described above, the pendulum dynamic damper 1 rotates the pendulum 4 around the axis of the shaft members 6 and 7 by the actuator 5 according to the rotational fluctuation order of the rotating member 2 to be absorbed or attenuated. Accordingly, in other words, by controlling the rotation angle of the pendulum 4, so as to switch the vibration fulcrum of the pendulum 4 oscillates parallel against the rotation surface 2a of the rotary member 2 to the link 8 or link 9. That is, the pendulum 4 can be set to a pendulum vibration order equal to the rotational fluctuation order of the rotating member 2 to be absorbed or damped by switching the vibration fulcrum to the link 8 or the link 9 to adjust the pendulum length. ing. Therefore, the pendulum length of the pendulum, that is, the pendulum vibration order can be changed by controlling the rotation angle around the axis of the pendulum according to the rotational fluctuation order of the rotating member. In other words, a plurality of pendulum vibration orders can be set for one pendulum. As a result, a plurality of rotational fluctuation orders or torsional vibration orders can be absorbed or attenuated by one pendulum.

  FIG. 3 schematically shows an example in which the configuration shown in FIGS. 1 and 2 is improved. In the example shown here, an actuator 5 is provided on the axis of the rotation center 2b of the rotating member 2, and a gear mechanism is interposed between the actuator 5 and the plurality of pendulums 4, so that the rotational fluctuation order of the rotating member 2 is increased. Accordingly, the pendulum length of the plurality of pendulums 4, that is, the pendulum vibration order can be changed simultaneously by rotating the actuator 5 accordingly. More specifically, a plurality of pendulum accommodation chambers 3 are formed inside the rotating member 2. Each pendulum storage chamber 3 stores a pendulum 4. The plurality of pendulums 4 are provided radially around the rotation center 2 b of the rotating member 2 such that the mass body 10 side is on the outer peripheral side of the rotating member 2.

  An actuator 5 is provided on the axis of the rotation center 2b of the rotating member 2. On the rotating shaft 5a of the actuator 5, for example, a driving gear 11 having a bevel gear shape is provided. A pendulum 4 is connected by a link 8 to a rotating shaft 12 a of a driven gear 12 that meshes with the driving gear 11. Further, between the rotary shaft 12a of the driven gear 12 and the rotary member 2, for example, a bearing or a clearance fitting member (not shown) is provided so that the pendulum 4 can rotate around the axis of the shaft members 6 and 7. ) Etc. are provided. Furthermore, as described above, the swinging direction of the pendulum 4 using the link 8 as a vibration fulcrum is orthogonal to the swinging direction of the pendulum 4 using the link 9 as a vibration fulcrum. The pendulum length of the pendulum with the link 8 or the link 9 as a vibration fulcrum is different. That is, the pendulum vibration order of the pendulum with the link 8 or the link 9 as a vibration fulcrum is different. The driving side gear 11 and the driven side gear 12 correspond to the gear mechanism in the present invention. The actuator 5 and the gear mechanism may be housed in a predetermined housing chamber 5b formed inside the rotating member 2 and on the axis of the rotation center 2b of the rotating member 2.

  In the configuration described above, the plurality of pendulums 4 may be configured to simultaneously rotate around the axis of the shaft members 6 and 7 by controlling the rotation angle of the actuator 5. Further, any of the plurality of pendulums 4 may be configured to rotate in conjunction with each other. For example, in FIG. 3, the pendulum vibration orders of any two of the four pendulum storage chambers 3 may be changed in conjunction with each other. Specifically, the other two pendulums 4 have the pendulum motion parallel to the rotating surface 2a of the rotating member 2 with the link 8 as the vibration fulcrum, and the other two pendulums 4 have the link 9 as the vibration fulcrum. You may comprise so that a pendulum motion parallel to the 2 rotation surface 2a may be carried out. That is, the pendulum length of the two pendulums 4 may be adjusted in conjunction, that is, the pendulum vibration order may be changed in conjunction.

  Therefore, in the configuration described above, the pendulum vibration orders of the plurality of pendulums 4 can be changed simultaneously, or a plurality of pendulum vibration orders can be mixed as a whole. Therefore, for example, when a plurality of rotational fluctuation orders are mixed in the rotating member 2, the pendulum vibration order of the pendulum 4 can be set for each of the mixed rotational fluctuation orders, and a plurality of different rotational fluctuation orders are absorbed or attenuated. be able to. Also, by adjusting the pendulum length of the plurality of pendulums 4, that is, the pendulum vibration order can be changed simultaneously by one actuator 5, the number of parts can be reduced. Therefore, the number of parts of the actuator 5 can be reduced as compared with the configuration shown in FIGS. Further, since the actuator 5 is provided on the rotation center 2b axis of the rotating member 2, the moment of inertia generated in the actuator 5 can be reduced as compared with the case where the actuator 5 is provided on the outer peripheral side of the rotating member 2.

  FIG. 4 is a flowchart showing an example of pendulum vibration order switching control in the apparatus 1 shown in FIGS. 1, 2, and 3. The routine shown in FIG. 4 is executed in a predetermined short time when, for example, the operation state of the engine of the vehicle is switched from all-cylinder operation to reduced-cylinder operation or from reduced-cylinder operation to all-cylinder operation. First, for example, control for switching the engine operating state from full cylinder operation to reduced cylinder operation, that is, whether or not so-called cylinder stop control is in an ON state, in other words, from a state where the excitation force from the engine is relatively small. It is determined whether or not the state is switched to a relatively large state (step S1). That is, this step S1 is for determining switching of the number of used cylinders of the engine. Therefore, if control for switching the engine operating state from all-cylinder operation to reduced-cylinder operation or from reduced-cylinder operation to all-cylinder operation is not performed, or if these controls have already been completed, a negative determination is made in step S1. This routine is temporarily terminated without performing any particular control.

  If the determination in step S1 is affirmative, rotation of any of the plurality of pendulums 4 is started by the actuator 5 (step S2). This step S2 is for adjusting the pendulum length of any of the plurality of pendulums 4, that is, for changing the pendulum vibration order of any of the plurality of pendulums 4. Therefore, in the example shown in FIGS. 1 and 2 described above, the number of actuators 5 whose rotation is controlled in step S2 and the number of pendulums 4 rotated by the actuator 5 can be arbitrarily set. In the example shown in FIG. 3, the number of pendulums 4 rotated by one actuator 5 can be arbitrarily set.

  Following the control in step S2, it is determined whether or not the pendulum 4 has been rotated by a predetermined angle by the actuator 5 (step S3). In other words, this step S3 is for determining whether or not the switching of the pendulum vibration order of the pendulum 4 rotated by the actuator 5 has been completed in step S2. The rotation angle of the pendulum 4 can be determined, for example, by detecting the phases of the links 8 and 9 using a gap sensor or the like. When a stepping motor is used for the actuator 5, the rotation angle of the pendulum 4 can be determined by detecting the electric pulse signal. Therefore, if the pendulum 4 is rotated by a predetermined angle, a positive determination is made in step S3. If the pendulum 4 is not rotated by a predetermined angle, a negative determination is made in step S3, the process returns to step S2, and the previous control is continued.

  If the determination in step S3 is affirmative, in step S2 and step S3 described above, the rotation control of the actuator 5 that has rotated any of the plurality of pendulums 4 is stopped, and the actuator 5 newly adds any other number. The rotation of the pendulum 4 is started (step S4). In this step S4, the pendulum length of any other plurality of pendulums 4 is adjusted in the example shown in FIGS. 1 and 2 described above, that is, the pendulum vibration order of any other plurality of pendulums 4 is changed. Is for. Therefore, the number of actuators 5 whose rotation is controlled in step S4 and the number of pendulums 4 rotated by the actuator 5 can be arbitrarily set. In the example shown in FIG. 3, the number of pendulums 4 rotated by one actuator 5 can be arbitrarily set.

  Following the control in step S3, it is determined whether or not the pendulum 4 has rotated by a predetermined angle by the actuator 5 (step S5). This step S5 is for determining whether or not the switching of the pendulum vibration order of the pendulum 4 rotated by the actuator 5 has been completed, as in step S3 described above. Therefore, if the pendulum 4 is rotated by a predetermined angle, an affirmative determination is made in step S5. If the pendulum 4 is not rotated by a predetermined angle, a negative determination is made in step S5, the process returns to step S4, and the previous control is continued.

  If an affirmative determination is made in step S5, the rotation of the actuator 5 that has rotated any other plurality of pendulums 4 is stopped in step S4 and step S5 described above, and the control state of the engine is in the normal state. (Step S6). This step S6 returns the engine control state from the so-called transient control state to the so-called normal control state in which the number of used cylinders is constant from the above-described transient control state by completing the control to change the pendulum vibration order of the pendulum 4 in stages. Is.

  Therefore, when the control shown in FIG. 4 is executed, the pendulum vibration order of the pendulum 4 can be switched stepwise in, for example, a so-called transient state where the number of used cylinders of the engine is switched. That is, in the so-called transient state described above, a relatively high rotational fluctuation order and a relatively low rotational fluctuation order coexist, but these rotational fluctuation orders are absorbed or attenuated by switching the pendulum vibration order stepwise. can do. In other words, the pendulum dynamic damper 1 according to the present invention includes the rotating member 2 in the transient state described above by adjusting the pendulum length of the pendulum stepwise, that is, by changing the pendulum vibration order stepwise. Thus, the torsional vibration and noise increase can be suppressed, and so-called smooth switching of the number of used cylinders can be performed. Further, since the pendulum vibration order is changed step by step, the pendulum vibration order of the pendulum 4 is switched with good responsiveness even when the control is turned off in a transient state where the cylinder stop control is being executed. be able to.

  Here, the relationship between the above-described control example and the present invention will be briefly described. The functional means for executing step S1 shown in FIG. 4 corresponds to the cylinder number switching detecting means in the present invention, and steps S2 to S5. The functional means for executing this corresponds to the actuator control means in the present invention.

  Therefore, according to the present invention, by adjusting the pendulum length of the pendulum by the pendulum length adjusting mechanism and changing the pendulum vibration order of the pendulum, it is possible to set different pendulum vibration orders in one pendulum. it can. As a result, a pendulum vibration order equal to the rotational fluctuation order can be set according to the rotational fluctuation order of the rotating member. In addition, even when a plurality of different rotation fluctuation orders are mixed, by providing a plurality of pendulums, different pendulum vibration orders can be set for each pendulum, so that the rotation fluctuation of the rotating member equal to each pendulum vibration order The order, ie the torsional vibration order, can be absorbed or damped.

  DESCRIPTION OF SYMBOLS 1 ... Pendulum type dynamic damper, 2 ... Rotating member, 2a ... Rotating surface of a rotating member, 4 ... Pendulum, 5 ... Actuator, 6, 7 ... Shaft member, 8, 9 ... Link.

Claims (4)

In a pendulum type dynamic damper in which a rotating member that is rotated by an engine is provided with a pendulum that swings according to the rotational fluctuation of the rotating member.
The position of the swing center of the pendulum is changed in accordance with the change in the rotational fluctuation order of the rotating member to adjust the distance from the rotation center of the rotating member to the swing center of the pendulum and the pendulum length of the pendulum Equipped with a pendulum length adjustment mechanism
The pendulum is provided with a two shaft members and two links,
The pendulum is slidably connected to the rotating member by one link provided on one shaft member, and is different from a direction in which the one shaft member swings relative to the rotating member by the one link. direction are connected the shaft member of the other side to the shaft member of the one by the other link, as the shaft member of the other side is swung relative to the shaft member of the one,
The pendulum length adjusting mechanism rotates the pendulum around the axis of the shaft member in accordance with a change in the rotational fluctuation order of the rotating member, so that the pendulum moves around the axis of the link member. A pendulum type dynamic damper is configured to adjust the length of the pendulum swinging in parallel with the rotation surface of the pendulum.
The pendulum length adjustment mechanism includes a mechanism in which a plurality of the pendulums are connected via a gear mechanism that is integrally rotatable with the rotating member and provided on a rotation center axis of the rotating member,
The pendulum length adjusting mechanism is configured to rotate any of the plurality of pendulums around the axis of the shaft member via the gear mechanism in accordance with a change in the rotational fluctuation order of the rotating member. The pendulum dynamic damper according to claim 1, wherein the pendulum length is adjusted so that the pendulum swings in parallel with the rotation surface of the rotating member. The pendulum length adjustment mechanism, in response to said rotational fluctuation following a change in the number of the rotating member, wherein the pendulum to 2 claim 1 or characterized in that it comprises an actuator for rotating about the axis of said shaft member Pendulum dynamic damper. Cylinder number switching detection means for detecting that the operating state of the engine is switched from full cylinder operation to reduced cylinder operation or from the reduced cylinder operation to the all cylinder operation;
When it is detected by the cylinder number switching detection means that the operating state of the engine is switched from the all-cylinder operation to the reduced-cylinder operation or from the reduced-cylinder operation to the all-cylinder operation, the number of cylinders used is changed. In the transient control state of the engine to be switched, after rotating the plurality of pendulums around the axis of the shaft member and adjusting the pendulum length of the plurality of pendulums, And an actuator control means for controlling the actuator so as to adjust the pendulum length of any one of the other plurality of pendulums by rotating a pendulum around the axis of the shaft member. Item 5. The pendulum dynamic damper according to Item 3 .

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