JP5212337B2 - Dynamic damper - Google Patents

Description

  The present invention relates to a dynamic damper that is attached to a rotating member and suppresses torque fluctuation or torsional vibration.

  A dynamic damper is known as a device that is attached to a rotating member such as a crankshaft of a vehicle engine, an input shaft or a drive shaft of a transmission, and suppresses torque fluctuation of the rotating member and torsional vibration caused by torque fluctuation. . The dynamic damper is a device that suppresses the occurrence of resonance by, for example, attaching a spring or a pendulum to the vibration system to absorb and attenuate the vibration of the vibration system and disperse the resonance points of the vibration system into a plurality.

  An example of such a dynamic damper is described in Patent Document 1. The rotating machine described in Patent Document 1 is fixed to a rotating shaft that is rotatably supported by a housing so as to be integrally rotatable, and rotates in the housing. And a second rotating body that is supported on the outside of the housing and arranged on the same axis as the first rotating body and is driven by an external driving force source. The first rotating body and the first rotating body A shock absorber disposed on a power transmission path between the two rotating bodies, and a pendulum centering on an axis passing through a point that is substantially parallel to the rotation center axis of each of the rotation bodies and spaced from the rotation center axis by a predetermined distance A dynamic damper having a mass body for movement is provided. In Patent Document 1, the buffer member is constituted by a container in which a fluid is sealed, thereby attenuating rotational vibration (torque fluctuation) transmitted between the first rotating body and the second rotating body. Is described.

  Further, Patent Document 2 discloses a cylindrical concave surface in which at least a surface facing the inner peripheral side of the rotating disk is centered on a line parallel to the rotating axis, on a rotating disk mounted on the same axis as the crankshaft of the engine. A plurality of storage chambers are provided at predetermined intervals in the circumferential direction of the rotating disk, and the rolling masses are respectively stored in the plurality of storage chambers in a rollable state. A dynamic damper in which an oil supply hole for supplying lubricating oil is formed is described.

JP 2003-83395 A JP 2001-153185 A

  As shown in FIG. 1, the dynamic damper described in each of the above Patent Documents 1 and 2 includes a rotating body 1 attached to a rotating member to be controlled, and the rotating body. This is a so-called centrifugal pendulum type dynamic damper D ′ composed of a plurality of pendulums (rolling elements; mass) 3 housed in a housing chamber 2 formed inside and held so as to be able to roll.

  Specifically, the rotating body 1 includes a cylindrical housing 1a and a housing cover 1b. The housing 1a is provided at a plurality of locations (four locations in the example of FIG. 1) on the peripheral side of the center portion. A housing chamber 2 having a shape hollowed out from one circular end surface of the housing 1a into a cylindrical shape is formed. The storage chambers 2 are arranged at equal intervals in the rotation direction of the rotating body 1, that is, in the circumferential direction of the rotating body 1. The housing cover 1b is a lid member that is integrally fixed to the housing 1a and seals each of the accommodation chambers 2 of the housing 1a.

  A pendulum 3, that is, a rolling element 3 is accommodated in each storage chamber 2. The rolling element 3 is constituted by a rigid body having a predetermined rigidity and weight for functioning as a centrifugal pendulum in the dynamic damper D ′, and has an outer diameter smaller than the inner diameter of the storage chamber 2 and a height (FIG. 1 (b) in the left-right direction) is formed in a columnar shape shorter than the depth of the storage chamber 2 (left-right dimension in FIG. 1 (b)). Note that the shape of the rolling element 3 is not limited to the cylindrical shape as described above, and may be any shape that can smoothly roll or swing in the storage chamber 2. For example, a sphere having a radius of curvature smaller than the inner diameter and depth of the storage chamber 2 may be used.

  Then, in a state where each rolling element 3 is accommodated in each accommodation chamber 2 of the housing 1a, the housing cover 1b is attached and fixed to the housing 1a, whereby the centrifugal pendulum type dynamic damper D ′ is provided. It is configured. Therefore, each rolling element 3 that functions as a pendulum in this centrifugal pendulum type dynamic damper D ′ is accommodated in each accommodating chamber 2 provided in the rotating body 1, and within each accommodating chamber 2 within each accommodating chamber 2. It is held so that it can roll or swing in the circumferential direction. The housing 1a and the housing cover 1b are sealed with, for example, a gasket or a seal member (not shown) so that the airtightness in each storage chamber 2 is maintained.

  When the dynamic damper D ′ configured as described above is attached to a rotating member such as an engine crankshaft or a transmission input shaft so as to rotate integrally with the rotating member, the torque of the rotating member is increased. The torsional vibration caused by the fluctuation or the torque fluctuation is suppressed.

  That is, when the dynamic damper D ′ attached so as to rotate integrally with the rotating member rotates at a predetermined rotational speed or more together with the rotating member, the respective rolling elements 3 are rotated by the centrifugal force acting on the respective rolling elements 3. Move to the outer periphery side. In other words, when the rotational speed of the dynamic damper D ′ becomes equal to or higher than a predetermined rotational speed at which centrifugal force larger than gravity acts on each rolling element 3, as shown in FIGS. The moving body 3 moves to the outer peripheral side of the rotating body 1 in each housing chamber 2 and comes into contact with the inner wall surface of each housing chamber 2, and the dynamic damper D ′ rotates. In this state, when torque fluctuation occurs in the rotating member and the torque fluctuation is transmitted to the dynamic damper D ′, each rolling element 3 is opposite to the direction of torque fluctuation in each storage chamber 2 of the dynamic damper D ′. Move relative to the direction. As a result, torque fluctuations are canceled out by the moments of inertia of the respective rolling elements 3, so that torque fluctuations or torsional vibrations caused by torque fluctuations can be suppressed.

  However, as described above, the dynamic damper D ′ configured as described above has the respective rolling chambers 3 affected by the gravity force and the centrifugal force and torque fluctuations when the dynamic damper D ′ rotates. Will move in. Therefore, when the rotational speed of the dynamic damper D ′ becomes lower than a predetermined rotational speed at which a centrifugal force larger than gravity acts on each rolling element 3, that is, when the centrifugal force acting on each rolling element 3 becomes smaller than gravity. As shown in FIG. 1 (c), each rolling element 3 falls in the direction of gravity in each storage chamber 2 and collides with the inner wall surface of each storage chamber 2, and abnormal noise or impact occurs at the time of the collision. Sound may be generated.

  Further, when the dynamic damper D ′ is attached to a vehicle drive system such as an engine crankshaft or a transmission input shaft, for example, as shown in FIG. Since there is a resonance point where the vibration inevitably increases in the low rotation speed region immediately after or immediately before the stop, when the rotation speed of the dynamic damper D ′ passes through the low rotation speed region, The posture and behavior of each rolling element 3 are disturbed, and as a result, each rolling element 3 collides with the inner wall surface of each containing chamber 2, and abnormal noise and impact sound may be generated at the time of the collision. .

  As a measure for preventing the generation of abnormal noise or impact noise when each rolling element 3 collides with the inner wall surface of each storage chamber 2, for example, each fluid containing a predetermined viscosity such as oil or grease is stored. It can be considered that the room 2 is filled. By filling each storage chamber 2 with such a fluid, each rolling element 3 in each storage chamber 2 receives the viscous resistance of the fluid, and therefore when each rolling element 3 moves in each storage chamber 2. The moving speed is suppressed. As a result, the impact force when each rolling element 3 collides with the inner wall surface of each storage chamber 2 is alleviated, and generation of abnormal noise and impact noise can be suppressed.

  However, when each of the storage chambers 2 is filled with fluid as described above, the generation of abnormal noise and impact noise can be suppressed, but each storage when torque fluctuation or torsional vibration occurs due to the viscous resistance of the fluid. The rolling or swinging of each rolling element 3 in the chamber 2 is also suppressed. Therefore, the vibration reduction effect of the dynamic damper D ′ is also reduced.

  In this way, it is still improved to prevent the generation of abnormal noise and impact sound due to the rolling element (pendulum) dropping or the posture or behavior disturbance without reducing the vibration reduction effect of the centrifugal pendulum type dynamic damper. There was room for.

  The present invention has been made paying attention to the above technical problem, and provides a centrifugal pendulum type dynamic damper capable of preventing the generation of abnormal noise and impact sound without reducing the vibration reduction effect. It is intended.

  In order to achieve the above object, the invention according to claim 1 is characterized in that a rolling element having a predetermined weight is accommodated in a pendulum accommodation chamber formed in a rotating body attached to a rotating member so as to roll or swing. In the held dynamic damper, the pendulum housing chamber is filled and has a fluid having a predetermined fluidity and viscosity, and the pendulum housing chamber inside the rotating body and in the rotational radius direction of the rotating body And a fluid storage chamber into which the viscous fluid flows from the pendulum storage chamber when a centrifugal force acts on the viscous fluid in the pendulum storage chamber. It is.

  According to a second aspect of the present invention, in the first aspect of the present invention, the viscous fluid is formed between the pendulum storage chamber and the fluid storage chamber and is formed between the pendulum storage chamber and the fluid storage chamber. A communication path that enables flow, and a ventilation path that is formed between the pendulum storage chamber and the fluid storage chamber and allows gas to flow between the pendulum storage chamber and the fluid storage chamber. Furthermore, it is characterized by providing.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, the viscous fluid is urged toward the pendulum housing chamber in opposition to the centrifugal force acting on the viscous fluid flowing into the fluid housing chamber. And an urging member for returning the viscous fluid to the pendulum storage chamber.

  According to a fourth aspect of the present invention, in the third aspect of the present invention, the urging member includes a piston that reciprocates in the rotational radial direction with the inner wall of the fluid storage chamber as a cylinder, and an elastic force to It includes a member constituted by an elastic body that presses the piston toward the pendulum housing chamber in the rotational radius direction.

According to a fifth aspect of the present invention, in the first aspect of the present invention, the viscous fluid formed between the pendulum storage chamber and the fluid storage chamber is formed between the pendulum storage chamber and the fluid storage chamber. A first communication hole that allows gas to flow, and is formed on the inner peripheral side of the pendulum housing chamber in the rotational radius direction to allow gas to flow between the pendulum housing chamber and the outside, and A second communication hole provided with a check valve that allows gas to flow into the pendulum storage chamber and inhibits the viscous fluid from flowing out of the pendulum storage chamber; and an outer peripheral side of the fluid storage chamber in the rotational radius direction And a third communication hole that allows gas to flow between the fluid storage chamber and the outside.

According to a sixth aspect of the present invention, in the fifth aspect of the invention, the first communication hole, the second communication hole, and the third communication hole are arranged in series on the same straight line in the rotational radius direction. It is characterized by this.

  According to the first aspect of the present invention, the pendulum storage chamber in which the rolling element functioning as a pendulum is stored in the centrifugal pendulum type dynamic damper is filled with a viscous fluid having predetermined fluidity and viscosity. Then, when the rotating body rotates integrally with the rotation member to be controlled, centrifugal force acts on the viscous fluid in the pendulum housing chamber, and as a result, the viscous fluid in the pendulum housing chamber is formed on the outer peripheral side of the pendulum housing chamber. Move to the fluid storage chamber. That is, when the rotational speed of the rotating body is relatively low and the centrifugal force acting on the viscous fluid is relatively small, the viscous fluid in the pendulum housing chamber remains in the pendulum housing chamber, but the rotational speed of the rotating body is When the centrifugal force acting on the viscous fluid becomes relatively high due to the relative increase, the viscous fluid in the pendulum housing chamber is moved to the fluid housing chamber on the outer peripheral side under the influence of the centrifugal force.

  Therefore, in the normal range where the rotational speed is relatively high, the viscous fluid moves from the pendulum housing chamber to the fluid housing chamber due to the action of centrifugal force, and the rolling element moves to the outermost peripheral side in the pendulum housing chamber. It functions as a centrifugal pendulum without receiving the viscous resistance. Therefore, the vibration reduction effect as a centrifugal pendulum type dynamic damper can be obtained reliably. In the low rotational speed range where the rotational speed is relatively lower than that in the normal range, the viscous fluid stays in the pendulum housing chamber, so that, for example, a large torque fluctuation is transmitted near the resonance point existing in the low rotational speed range. Even if the posture and behavior of the rolling element are disturbed, or even if the centrifugal force acting on the rolling element becomes smaller than gravity and the rolling element falls in the direction of gravity in the pendulum accommodation chamber, Thus, when the rolling element receives the viscous resistance of the viscous fluid, the impact when the rolling element collides with the inner wall of the pendulum housing chamber is alleviated. Therefore, it is possible to prevent or suppress the generation of abnormal noise or impact sound due to the rolling element falling in the pendulum housing chamber, the posture, or the disturbance of the behavior.

  According to the invention of claim 2, by providing a communication path between the pendulum storage chamber and the fluid storage chamber, the viscous fluid is allowed to flow between the pendulum storage chamber and the fluid storage chamber. Can do. Then, by providing a ventilation path between the pendulum storage chamber and the fluid storage chamber, for example, the pendulum storage chamber is configured so that the gas enclosed with the viscous fluid in the pendulum storage chamber and the fluid storage chamber, such as air and nitrogen gas, is contained in the pendulum storage chamber. Between each other and the fluid storage chamber. Therefore, when the viscous fluid moves between the pendulum storage chamber and the fluid storage chamber, the gas in the pendulum storage chamber and the fluid storage chamber can also easily flow between the pendulum storage chamber and the fluid storage chamber. The flow of the viscous fluid between the pendulum storage chamber and the fluid storage chamber is not hindered by the gas, and the viscous fluid can be easily circulated between the pendulum storage chamber and the fluid storage chamber.

  According to the invention of claim 3, by providing the biasing member in the fluid storage chamber, the viscous fluid flowing into the fluid storage chamber is biased toward the pendulum storage chamber. Therefore, the viscous fluid that has flowed into the fluid storage chamber can be easily returned to the pendulum storage chamber.

  According to the invention of claim 4, the inner wall of the fluid storage chamber is formed as a cylinder, and the piston that is pressed toward the pendulum storage chamber in the cylinder is provided. Therefore, the viscous fluid that has flowed into the fluid storage chamber can be efficiently returned to the pendulum storage chamber.

According to the invention of claim 5, the first communication hole, the second communication hole, and the third communication hole are provided between the pendulum storage chamber and the fluid storage chamber and in the pendulum storage chamber and the fluid storage chamber, respectively. Thus, the viscous fluid and the gas are reliably stratified in the pendulum storage chamber, between the pendulum storage chamber and the fluid storage chamber, and in the fluid storage chamber. That is, the viscous fluid is prevented from entering the gas layer. Therefore, the viscous fluid can be smoothly circulated between the pendulum storage chamber, between the pendulum storage chamber and the fluid storage chamber, and in the fluid storage chamber.

And according to invention of Claim 6, a 1st communicating hole, a 2nd communicating hole, and a 3rd communicating hole are arrange | positioned in the position on a straight line. Therefore, these three communicating holes can be easily formed by, for example, one drilling process, and the productivity of the dynamic damper can be improved.

It is the model for demonstrating the basic composition of the dynamic damper which concerns on this invention, and the structural example by a prior art. It is a schematic diagram for demonstrating the structure in 1st Example of the dynamic damper which concerns on this invention. It is a schematic diagram for demonstrating the operating state of each part of the apparatus in the structural example shown in FIG. 2, and the fluctuation state of a viscous fluid. It is a schematic diagram for demonstrating the other structural example in 1st Example of the dynamic damper which concerns on this invention. It is a schematic diagram for demonstrating the other structural example in 1st Example of the dynamic damper which concerns on this invention. It is a schematic diagram for demonstrating the other structural example in 1st Example of the dynamic damper which concerns on this invention. It is a schematic diagram for demonstrating the structure in 2nd Example of the dynamic damper which concerns on this invention. It is a schematic diagram for demonstrating the operating state of each part of the apparatus in the structural example shown in FIG. 7, and the fluctuation state of a viscous fluid. It is a schematic diagram for demonstrating the structure in 3rd Example of the dynamic damper which concerns on this invention. It is a schematic diagram for demonstrating the vibration transmission characteristic of the drive system of a vehicle.

  Next, the present invention will be described based on specific examples. The basic configuration of the dynamic damper D that is the subject of the present invention is substantially the same as the basic configuration of the dynamic damper D 'shown in FIG. That is, the dynamic damper D includes, for example, a rotating body 1 that is attached to a rotating member to be controlled such as a crankshaft of a vehicle engine, an input shaft or a drive shaft of a transmission, and the like, and the rotating body of the rotating body. A pendulum housing chamber 2 formed inside and a plurality of rolling elements (pendulums) 3 housed in the pendulum housing chamber 2 and held so as to be capable of rolling or swinging are configured as main components.

(First embodiment)
Specifically, as shown in FIG. 2 as a first embodiment of the present invention, a pendulum housing chamber 2 for housing the rolling element 3 is formed inside the rotating body 1, and the interior of the rotating body 1 is further formed. In addition, an oil storage chamber (fluid storage chamber) 4 is formed on the outer peripheral side (upper side in FIG. 2) of the pendulum storage chamber 2 in the rotational radius direction (vertical direction in FIG. 2).

  A piston 5 that reciprocates in the rotational radius direction of the rotating body 1 is inserted into the oil storage chamber 4 using the inner wall of the oil storage chamber 4 as a cylinder. The piston 5 is pressed toward the inner peripheral side in the rotational radius direction of the rotating body 1, that is, the pendulum housing chamber 2 side, by the elastic force of the elastic body 6 acting on the outer end surface 5 a in the rotational radius direction of the rotating body 1. It is configured to be.

  The elastic body 6 is a member that generates an elastic force against the compression force, and for example, a compression coil spring or rubber can be used. In the specific example shown in FIG. 2, a plurality of springs 6 are provided. Therefore, in a state where no force against the elastic force of the spring 6 acts on the piston 5, the piston 5 is pressed toward the inner peripheral side in the rotational radius direction of the rotating body 1 by the elastic force of the spring 6, The oil storage chamber 4 is in contact with the bottom surface 4 a on the inner peripheral side in the rotational radius direction of the rotating body 1. The spring 6 preferably applies a pressing force by an elastic force evenly to the end surface 5a of the piston 5. If the pressing force acts evenly on the end surface 5a, a large-diameter spring 6 is used. One may be provided, or a plurality of (including two or more) small-diameter springs 6 may be provided as shown in FIG.

  A communication path 7 is formed between the pendulum storage chamber 2 and the oil storage chamber 4. Specifically, the communication path 7 is formed between the outermost peripheral portion 2o in the rotational radius direction of the rotating body 1 of the pendulum storage chamber 2 and the innermost peripheral portion 4i in the rotational radius direction of the rotating body 1 of the oil storage chamber 4. It is comprised by the through-hole which penetrated. Further, an air passage 8 is formed between the pendulum storage chamber 2 and the oil storage chamber 4. Specifically, the air passage 8 is formed between the innermost peripheral portion 2 i in the rotational radius direction of the rotating body 1 of the pendulum storage chamber 2 and the outermost peripheral portion 4 o in the rotational radius direction of the rotating body 1 of the oil storage chamber 4. It is comprised by the flow path or pipe line etc. which communicated.

  The pendulum storage chamber 2 is filled with oil 9. The oil 9 suppresses the moving speed when the rolling element 3 moves in the pendulum housing chamber 2 due to its viscosity, and the oil 9 during the collision between the rolling body 3 and the inner wall of the pendulum housing chamber 2 in the pendulum housing chamber 2 is suppressed. This is to reduce the impact. Therefore, a viscous fluid having appropriate fluidity and viscosity is selected as the oil 9.

  FIG. 2 shows a state in which the dynamic damper D is not rotating. In this state, the oil 9 is in the remaining space excluding the volume of the rolling element 3 in the pendulum storage chamber 2 and the communication path 7. Almost filled. The remaining space excluding the volume of the piston 5 and the spring 6 in the oil storage chamber 4 and the air passage 8 are filled with a gas 10 such as air or nitrogen gas.

  As described above, the piston 5 and the spring 6 are provided in the oil storage chamber 4 communicating with the pendulum storage chamber 2 filled with the oil 9 via the communication path 7. Thus, when the oil 9 receives the action of the centrifugal force and flows into the oil storage chamber 4 in opposition to the pressing force of the spring 6, it opposes the centrifugal force acting on the oil 9 flowing into the oil storage chamber 4. Then, the oil 9 can be urged and pressed toward the pendulum storage chamber 2 to return the oil 9 to the pendulum storage chamber 2. That is, if the centrifugal force becomes smaller than the pressing force by the spring 6 based on the balance between the centrifugal force opposed to each other via the piston 5 in the oil storing chamber 4 and the pressing force by the spring 6, The oil 9 is pressed by the piston 5 and returned to the pendulum housing chamber 2. Therefore, the urging member in the present invention is constituted by the piston 5 and the spring 6.

  The operation of the dynamic damper D in the first embodiment of the present invention configured as described above will be described. When the dynamic damper D as shown in FIG. 2 is stopped, the rotating member to be damped starts to rotate, and when the dynamic damper D starts to rotate integrally with the rotating member, the pendulum housing chamber increases. Centrifugal force corresponding to the rotational speed of the dynamic damper D acts on the rolling elements 3 and the oil 9 in 2. That is, as the rotational speed of the dynamic damper D increases, a larger centrifugal force acts on the rolling elements 3 and the oil 9 in the pendulum housing chamber 2.

  Accordingly, when the rotational speed of the dynamic damper D gradually increases, the centrifugal force acting on the rolling element 3 and the oil 9 in the pendulum housing chamber 2 also gradually increases, and the rolling element 3 is subjected to the centrifugal force acting on the rolling element 3. By becoming larger than the gravity acting on the moving body 3, it moves to the outermost peripheral part 2o side in the pendulum accommodation chamber 2. On the other hand, the oil 9 has a centrifugal force acting on the piston 5 in the oil storage chamber 4 through the communication passage 7 larger than the elastic force of the spring 6 that presses the piston 5 toward the pendulum storage chamber 2. The piston 5 is pushed up to the outermost peripheral portion 4 o side of the oil storage chamber 4 and flows into the oil storage chamber 4.

  When the oil 9 flows between the pendulum storage chamber 2 and the oil storage chamber 4 through the communication path 7, as described above, between the pendulum storage chamber 2 and the oil storage chamber 4. Since the air passage 8 is provided, the gas 10 sealed together with the oil 9 in the pendulum storage chamber 2 and the oil storage chamber 4 is exchanged between the pendulum storage chamber 2 and the oil storage chamber 4. It can be distributed. Therefore, when the oil 9 moves between the pendulum storage chamber 2 and the oil storage chamber 4, the gas 10 in the pendulum storage chamber 2 and the oil storage chamber 4 also follows the movement of the oil 9. Since it can circulate easily between the storage chamber 2 and the oil storage chamber 4, it is avoided that the flow of the oil 9 between the pendulum storage chamber 2 and the oil storage chamber 4 is hindered by the gas 10, Oil can be easily circulated between the pendulum storage chamber 2 and the oil storage chamber 4.

  In the low rotational speed region where the rotational speed of the rotating member, that is, the dynamic damper D is relatively low, that is, in the rotational region such as immediately after the rotational member to be controlled starts rotating or just before stopping the rotation, the dynamic damper D As shown in FIG. 3A, the rolling element 3 moves to the outermost peripheral portion 2 o side in the pendulum storage chamber 2, and part of the oil 9 flows from the pendulum storage chamber 2 into the oil storage chamber 4. It will be in the state. In this state, since the oil 9 is still present around the rolling element 3 in the pendulum accommodation chamber 2, the movement of the rolling element 3 in the pendulum accommodation chamber 2 is limited by the viscous resistance of the oil 9. Therefore, for example, even when a sudden torque fluctuation or a large torsional vibration is transmitted from the rotating member side to be controlled to the dynamic damper D, the rolling element 3 is attached to the inner wall of the pendulum storage chamber 2 in the pendulum storage chamber 2. Against a sudden collision is avoided. Therefore, generation | occurrence | production of the abnormal sound and impact sound by the rolling element 3 colliding rapidly with the inner wall of the pendulum storage chamber 2 is prevented or suppressed.

  When the rotational speed of the rotating member to be controlled, that is, the dynamic damper D is further increased and the rotational member is normally rotated, the rolling element 3 in the pendulum housing chamber 2 becomes a normal area where the rotational speed is relatively high. Further, the centrifugal force acting on the oil 9 is further increased. As shown in FIG. 3B, almost all the oil 9 is moved while the rolling element 3 is moved toward the outermost peripheral portion 2o in the pendulum housing chamber 2. It enters a state where it flows into the oil storage chamber 4 from the storage chamber 2. In this state, since the oil 9 is hardly interposed around the rolling element 3 in the pendulum storage chamber 2, the movement of the rolling element 3 in the pendulum storage chamber 2 may be limited by the viscous resistance of the oil 9. Absent. Accordingly, the rolling element 3 can freely roll or swing in the pendulum housing chamber 2, and torque fluctuations and torsional vibrations resulting from the torque fluctuations are transmitted from the rotating member side to be controlled to the dynamic damper D. In this case, the rolling element 3 can freely move in a direction to reduce or attenuate the torque fluctuation or torsional vibration in response to the torque fluctuation or torsional vibration. Therefore, the vibration reduction effect of the centrifugal pendulum type dynamic damper D in which the rolling element 3 functions as a centrifugal pendulum for vibration reduction can be reliably obtained.

  Other structural examples of the first embodiment of the present invention shown in FIGS. 2 and 3 are shown in FIGS. 2 and 3 show an example in which the urging member according to the present invention is configured by the piston 5 and the spring 6. However, the urging member according to the present invention is mainly located in the oil storage chamber 4. Opposite to the centrifugal force acting on the oil 9 that has flowed in, any oil can be used as long as it can urge the oil 9 toward the pendulum storage chamber 2 and return the oil 9 to the pendulum storage chamber 2. 2 is not limited to the specific example shown in FIG.

  For example, the configuration shown in FIG. 4 is an example in which the biasing member according to the present invention is configured by a rubber 11 formed in, for example, a bellows shape and a piston 5 instead of the above-described spring 6. By setting the hardness and shape of the rubber 11 appropriately and giving the rubber 11 a predetermined elastic force equivalent to that of the spring 6 described above, It can function similarly.

  Further, the configuration shown in FIG. 5 is an example in which the biasing member in the present invention is configured by a plate spring 12 and an adjustment weight 13 instead of the piston 5 and the spring 6 described above. That is, a flat spring 12 having a predetermined spring constant at no load and having flexibility to the outer peripheral side in the rotational radius direction of the rotating body 1 in the oil storage chamber 4 is connected to the center portion thereof. It is arranged on the bottom surface 4 a of the oil storage chamber 4 so that the opening of the passage 7 is located, and both end portions of the leaf spring 12 are fixed in the oil storage chamber 4.

  Then, the spring constant and weight of the leaf spring 12 or the weight of the adjustment weight 13 attached and fixed on the outer circumferential surface 12a on the outer circumferential side of the rotating body 1 of the rotating body 1 of the leaf spring 12 are set as appropriate. Thus, by giving the rubber 11 a predetermined elastic force equivalent to that of the spring 6 described above, the rubber 11 can function in the same manner as the biasing member constituted by the piston 5 and the spring 6 described above.

  Further, the configuration shown in FIG. 6 is an example in which the biasing member in the present invention is configured by a spring-equipped hinge 14 instead of the piston 5 and the spring 6 described above. That is, the plate portion 14a of the spring-equipped hinge 14 corresponding to the piston 5 described above is directed to the outer peripheral side in the rotational radius direction of the rotating body 1 in the oil containing chamber 4 with one of the end portions of the plate portion 14a as a base point. For example, a torsion coil spring 14b is attached so as to rotate, and a hinge 14 with a spring is formed. The plate portion 14a is disposed on the bottom surface 4a of the oil storage chamber 4 so that the opening of the communication passage 7 is located at the center thereof.

  Then, the weight of the plate portion 14a of the hinge 14 with the spring, the spring constant of the torsion coil spring 14b, etc. are appropriately set to correspond to the predetermined elastic force equivalent to the spring 6 or the elastic force of the spring 6. By imparting a predetermined elastic force, it is possible to function in the same manner as the urging member composed of the piston 5 and the spring 6 described above.

  As described above, according to the dynamic damper D in the first embodiment of the present invention, the rolling element 3 that functions as a pendulum in the centrifugal pendulum type vibration absorber is formed in the pendulum housing chamber 2 formed inside the rotating body 1. The pendulum storage chamber 2 is filled with oil 9 having a predetermined fluidity and viscosity. Therefore, when the dynamic damper D rotates integrally with the rotating member to be controlled, and the centrifugal force acting on the viscous fluid 9 in the pendulum storage chamber 2 increases due to the increase in the rotation speed, the dynamic damper D in the pendulum storage chamber 2 The oil 9 moves to the oil storage chamber 4 formed on the outer peripheral side of the pendulum storage chamber 4. That is, when the rotational speed of the dynamic damper D is relatively low and the centrifugal force acting on the oil 9 is relatively small, the oil 9 in the pendulum storage chamber 2 remains in the pendulum storage chamber 2, but dynamic When the rotational speed of the damper D becomes relatively high and the centrifugal force acting on the oil 9 becomes relatively large, the oil 9 in the pendulum housing chamber 2 is affected by the centrifugal force and is applied to the oil housing chamber 4 on the outer peripheral side. Moving.

  Accordingly, in the normal range where the rotational speed is relatively high, the oil 9 moves from the pendulum storage chamber 2 to the oil storage chamber 4 due to the action of centrifugal force, and the rolling element 3 is located at the outermost peripheral portion 2o in the pendulum storage chamber 2. And functions as a centrifugal pendulum without receiving the viscous resistance of the oil 9. Therefore, the vibration reduction effect as the centrifugal pendulum type dynamic damper D can be obtained with certainty.

  In the low speed range where the rotational speed is relatively lower than that in the normal range, the oil 9 stays in the pendulum housing chamber 2. For example, the oil 9 is large near the resonance point of the engine existing in the low speed range. When the torque fluctuation is transmitted and the posture and behavior of the rolling element 3 are disturbed, or the centrifugal force acting on the rolling element 3 becomes smaller than gravity and the rolling element 3 falls in the direction of gravity in the pendulum housing chamber 2. In such a case, the rolling element 3 receives the viscous resistance of the oil 9 in the pendulum storage chamber 2 so that the impact when the rolling element 3 collides with the inner wall of the pendulum storage chamber 2 is alleviated. Therefore, it is possible to reliably prevent or suppress the generation of abnormal noise and impact sound due to the rolling element 3 falling in the pendulum storage chamber 2 and the posture or behavior disturbance.

  In the oil storage chamber 4, for example, an urging member composed of a piston 5 and a spring 6, or a piston 5 and a rubber 11 as shown in FIGS. 4, 5, and 6 are used. Alternatively, since an urging member constituted by the leaf spring 12 and the adjustment weight 13 or the hinge 14 with the spring is provided, the oil 9 that has flowed into the oil storage chamber 4 always moves toward the pendulum storage chamber 2 side. It is energized towards. Therefore, when the centrifugal force acting on the oil 9 decreases and becomes smaller than the pressing force by the biasing member, the oil 9 that has flowed into the oil storage chamber 4 can be easily returned to the pendulum storage chamber 2. .

(Second embodiment)
FIG. 7 shows a configuration example in the second embodiment of the dynamic damper D of the present invention. The example shown in FIG. 7 is an example of a configuration in which a flow path opening / closing mechanism 21 is provided in a flow path in which oil 9 flows between the pendulum storage chamber 2 and the oil storage chamber 4. The configuration of each part other than the flow path opening / closing mechanism 21 is basically the same as that shown in the previous drawings such as FIGS. 1 and 2 in the first embodiment. Therefore, in the following description, the same reference numerals as those in the previous drawings are attached to the same components as those described in the previous drawings, and detailed description thereof will be omitted. In addition, description of the ventilation path 8 is abbreviate | omitted.

  In FIG. 7, a flow path opening / closing mechanism 21 that controls the open / close state of the communication path 7 is provided in a flow path in which oil flows between the pendulum storage chamber 2 and the oil storage chamber 4, that is, the communication path 7. Specifically, the flow path opening / closing mechanism 21 is interlocked with the reciprocating motion of the piston 5 in the oil storage chamber 4 to open and close the communication path 7 and a penetration formed in the shielding plate 21a. It is comprised from the hole 21b.

  The shielding plate 21a is interlocked with the operation when the piston 5 reciprocates in the inner and outer peripheral directions (vertical direction in FIG. 7) in the oil storage chamber 4 by a link mechanism or a wire transmission mechanism (not shown), for example. Further, the communication passage 7 is configured to reciprocate (slide) in a direction (left-right direction in FIG. 7) orthogonal to the communication direction (up-down direction in FIG. 7). A through hole 21b is formed in a part of the flat plate portion of the shielding plate 21a so as to coincide with the opening portion of the communication path 7 when the communication path 7 is opened.

  When the dynamic damper D rotates and centrifugal force acts on the oil 9 by appropriately setting an elastic force of the spring 6 and a link mechanism that slides the shielding plate 21 a in conjunction with the operation of the piston 5. In addition, when the centrifugal force is equal to or greater than a first predetermined value α set in advance as a threshold value, the through hole 21b of the shielding plate 21a and the opening portion of the communication path 7 are matched, that is, the communication path 7 is The shielding plate 21 a is operated so that the oil 9 can be circulated between the pendulum storage chamber 2 and the oil storage chamber 4. And when the centrifugal force which acts on the oil 9 becomes more than the 2nd predetermined value (beta) preset as a threshold value, the position of the through-hole 21b of the shielding board 21a and the opening part of the communicating path 7 is shifted, ie, The shielding plate 21 a is operated so that the communication passage 7 is closed and the flow of the oil 9 is blocked between the pendulum storage chamber 2 and the oil storage chamber 4.

  The first predetermined value α and the second predetermined value β are values satisfying the relationship of “first predetermined value α <second predetermined value β”. For example, the first predetermined value α is the pendulum housing chamber. The centrifugal force acting on the rolling element 3 in 2 is set to a value in the vicinity where the centrifugal force is greater than gravity. The second predetermined value β is set to a value in the vicinity of the centrifugal force that acts on the oil 9 when almost all of the oil 9 flows from the pendulum storage chamber 2 into the oil storage chamber 4.

  Therefore, when the centrifugal force acting on the oil 9 exceeds the first predetermined value α set in advance by the shielding plate 21a, the through hole 21b, a link mechanism (not shown), etc., the pendulum housing chamber 2 and the oil In the present invention, the communication passage 7 through which the oil 9 flows is opened between the storage chamber 4 and the communication passage 7 is closed when the centrifugal force becomes equal to or larger than a second predetermined value β larger than the first predetermined value α. A flow path opening / closing mechanism is configured.

  The operation of the dynamic damper D in the second embodiment of the present invention configured as described above will be described. As shown in FIG. 7 described above, in a state where the dynamic damper D is stopped, the communication path 7 between the pendulum storage chamber 2 and the oil storage chamber 4 is closed by the flow path opening / closing mechanism 21. That is, the pendulum storage chamber 2 and the oil storage chamber 4 are blocked by the flow path opening / closing mechanism 21, and the oil 9 is sealed in the pendulum storage chamber 2.

  When the dynamic damper D is stopped and the rotating member to be damped starts to rotate, and the dynamic damper D starts to rotate integrally with the rotating member, the rolling elements 3 in the pendulum housing chamber 2 and A centrifugal force corresponding to the rotational speed of the dynamic damper D acts on the oil 9. When the rotational speed of the dynamic damper D gradually increases, the centrifugal force acting on the rolling element 3 and the oil 9 in the pendulum housing chamber 2 gradually increases, and the rolling element 3 receives the centrifugal force acting on the rolling element 3. It moves to the outermost peripheral part 2o side in the pendulum storage chamber 2 by becoming larger than the gravity acting on the pendulum.

  When the centrifugal force acting on the oil 9 becomes equal to or greater than the first predetermined value α, the communication path 7 is opened by the flow path opening / closing mechanism 21 as shown in FIG. The centrifugal force acting on the piston 5 in the oil storage chamber 4 via the passage 7 becomes larger than the elastic force of the spring 6 that presses the piston 5 toward the pendulum storage chamber 2, thereby causing the piston 5 to move to the oil storage chamber 4. Is pushed up to the outermost peripheral portion 4 o side, and a part thereof flows into the oil storage chamber 4.

  In this state, as described above, since the oil 9 is still present around the rolling element 3 in the pendulum accommodation chamber 2, the movement of the rolling element 3 in the pendulum accommodation chamber 2 is caused by the viscous resistance of the oil 9. Limited. Therefore, for example, even when a sudden torque fluctuation or a large torsional vibration is transmitted from the rotating member side to be controlled to the dynamic damper D, the rolling element 3 is attached to the inner wall of the pendulum storage chamber 2 in the pendulum storage chamber 2. Against a sudden collision is avoided. Therefore, generation | occurrence | production of the abnormal sound and impact sound by the rolling element 3 colliding rapidly with the inner wall of the pendulum storage chamber 2 is prevented or suppressed.

  Further, when the centrifugal force acting on the oil 9 increases and becomes equal to or greater than the second predetermined value β, the communication path 7 is closed by the flow path opening / closing mechanism 21 as shown in FIG. That is, when the rotational speed of the dynamic damper D is further increased and the rotating member is normally rotated and the rotational speed becomes a normal range, the action is applied to the rolling elements 3 and the oil 9 in the pendulum housing chamber 2. The centrifugal force to be further increased, and almost all of the oil 9 flows from the pendulum storage chamber 2 to the oil storage chamber 4 while the rolling element 3 moves to the outermost peripheral portion 2o side in the pendulum storage chamber 2. In order to maintain this state, the communication path 7 is closed by the flow path opening / closing mechanism 21.

  In this state, as described above, since the oil 9 is not substantially disposed around the rolling element 3 in the pendulum accommodation chamber 2, the movement of the rolling element 3 in the pendulum accommodation chamber 2 is caused by the viscous resistance of the oil 9. There is no limit. Therefore, the communication path 7 is closed by the flow path opening / closing mechanism 21 in this normal state, and the flow of the oil 9 is blocked, thereby preventing the backflow of the oil 9 from the oil storage chamber 4 to the pendulum storage chamber 2. be able to. Therefore, the vibration reduction effect of the centrifugal pendulum type dynamic damper D in which the rolling element 3 functions as a centrifugal pendulum for vibration reduction can be obtained more reliably.

  As described above, according to the dynamic damper D in the second embodiment of the present invention, the flow path opening / closing mechanism 21 is provided in the communication path 7 between the pendulum storage chamber 2 and the oil storage chamber 4, for example, When the dynamic damper D enters the service area where the rotational speed is relatively high, the communication path 7 between the pendulum storage chamber 2 and the oil storage chamber 4 is opened, and the oil 9 in the pendulum storage chamber 2 is opened. Of the dynamic damper D is further increased, that is, the centrifugal force acting on the oil 9 is further increased, and the oil 9 in the pendulum storage chamber 2 is sufficiently oily. The communication path 7 between the pendulum storage chamber 2 and the oil storage chamber 4 can be closed while being moved to the storage chamber 4. Therefore, the oil 9 in the pendulum storage chamber 2 is sufficiently moved to the oil storage chamber 4 in the normal range, and the rolling element 3 in the pendulum storage chamber 2 is not subjected to the viscous resistance of the oil 9 and the centrifugal pendulum of the dynamic damper D Since the oil 9 in the oil storage chamber 4 does not flow back to the pendulum storage chamber 2, the vibration reduction effect as the centrifugal pendulum type dynamic damper D can be obtained with certainty.

(Third embodiment)
FIG. 9 shows a configuration example in the third embodiment of the dynamic damper D of the present invention. In the example shown in FIG. 9, in addition to the flow path that enables the oil 9 and the gas 10 to flow between the pendulum storage chamber 2 and the oil storage chamber 4, that is, the communication path 7, It is an example of the structure which provided the flow path 31 which enables the distribution | circulation of the gas 10 between, and the flow path 32 which enables the distribution | circulation of the gas 10 between the oil storage chamber 4 and the exterior. The structure of each part other than the newly provided flow paths 31 and 32 is basically the same as that shown in the previous drawings such as FIGS. 1 and 2 in the first embodiment. Therefore, in the following description, the same reference numerals as those in the previous drawings are attached to the same components as those described in the previous drawings, and detailed description thereof will be omitted.

  9A, a flow path 31 through which the gas 10 flows is provided between the pendulum storage chamber 2 and the outside. The flow path 31 communicates the inside of the pendulum housing chamber 2 and the external space, and is configured by a flow path or a pipe line that communicates between the pendulum housing chamber 2 and the outside. In the specific example shown in FIG. 9A, the rotating body 1 is formed in a hollow shape in which the inner peripheral side of the pendulum housing chamber 2 in the rotating body 1 is hollowed out. The flow path 31 is formed by a communication hole 31 that passes through the hollow portion in the rotational radius direction of the rotating body 1.

  A check valve 33 is provided in the middle of the flow path 31, that is, the communication hole 31. As shown in FIG. 9B, the check valve 31 is a so-called check valve composed of a spring 33s and a check ball 33b pressed against the valve seat 33a by the elastic force of the spring 33s. The suction port 33i on the side where the seat 33a is formed (the lower side of FIG. 9A) communicates with the outside, while the side on which the spring 33s is disposed (the upper side of FIG. 9A) ) Is connected to the pendulum storage chamber 2. Accordingly, the check valve 33 is configured to permit the inflow of the gas 10 from the external space to the pendulum housing chamber 2 and to prevent the oil 9 from flowing out of the pendulum housing chamber 2 in the communication hole 31. .

  On the other hand, a flow path 32 through which the gas 10 flows between the oil storage chamber 4 and the outside is provided. The flow path 32 communicates the inside of the oil storage chamber 4 and the external space, and is configured by a flow path or a conduit that communicates between the oil storage chamber 4 and the outside. In the specific example shown in FIG. 9A, the flow path 32 is formed by a communication hole 32 that penetrates from the outermost peripheral portion 4 o of the oil storage chamber 4 to the external space in the rotational radius direction of the rotating body 1. .

  In this way, the communication path 7 formed between the pendulum storage chamber 2 and the oil storage chamber 4 and allowing the oil 9 and the gas 10 to flow between the pendulum storage chamber 2 and the oil storage chamber 4 is provided. This corresponds to the first communication hole in the present invention, is formed on the inner peripheral side of the pendulum housing chamber 2 in the rotational radius direction of the rotating body 1 and enables the gas 10 to flow between the pendulum housing chamber 2 and the outside. The communication hole 31 provided with the check valve 33 that allows the gas 10 to flow into the pendulum storage chamber 2 and prevents the oil 9 from flowing out of the pendulum storage chamber 2 corresponds to the second communication hole of the present invention. And the communicating hole 32 formed in the outer peripheral side of the oil storage chamber 4 in the rotation radius direction of the rotary body 1 and enabling the flow of the gas 10 between the oil storage chamber 4 and the outside is the third in the present invention. It corresponds to a communication hole.

  Note that the communication path 7, the communication hole 31, and the communication hole 32 are arranged in series on the same straight line in the rotational radius direction of the rotating body 1 in the rotating body 1 as through holes. Therefore, the three communication holes 7, 31, 32 can be easily formed by, for example, one drilling process, and the productivity of the dynamic damper D can be improved.

  As described above, according to the dynamic damper D in the third embodiment of the present invention, the first communication between the pendulum storage chamber 2 and the oil storage chamber 4, and the pendulum storage chamber 2 and the oil storage chamber 4, respectively. By providing the hole 7, the second communication hole 31, and the third communication hole 32, the oil 9 is provided in the pendulum storage chamber 2, between the pendulum storage chamber 2 and the oil storage chamber 4, and in the oil storage chamber 4. And the gas 10 are reliably stratified. That is, the oil 9 is prevented from being mixed into the gas 10 layer. Therefore, the oil 9 can be smoothly circulated in the pendulum storage chamber 2, between the pendulum storage chamber 2 and the oil storage chamber 4, and in the oil storage chamber 4.

  DESCRIPTION OF SYMBOLS 1 ... Rotating body, 2 ... Pendulum storage chamber, 3 ... Rolling body (pendulum), 4 ... Oil storage chamber (fluid storage chamber), 5 ... Piston, 6 ... Spring (elastic body), 7 ... Communication path (1st communication) Holes), 8 ... vent passages, 9 ... oil (viscous fluid), 10 ... gas, 21 ... flow path opening / closing mechanism, 21a ... shielding plate, 21b ... through hole, 31 ... communication hole (second communication hole), 32 ... Communication hole (third communication hole) 33: Check valve D: Dynamic damper

Claims (6)

In a dynamic damper in which a rolling element having a predetermined weight is accommodated and held so as to be capable of rolling or swinging in a pendulum housing chamber formed inside a rotating body attached to the rotating member,
A viscous fluid that fills the pendulum storage chamber and has a predetermined fluidity and viscosity;
When the centrifugal force acts on the viscous fluid in the pendulum storage chamber, the pendulum storage chamber is formed on the outer peripheral side of the pendulum storage chamber in the rotational radius direction of the rotary body. A dynamic damper comprising a fluid storage chamber into which a viscous fluid flows. A communication path formed between the pendulum storage chamber and the fluid storage chamber and allowing the viscous fluid to flow between the pendulum storage chamber and the fluid storage chamber;
It further comprises an air passage formed between the pendulum storage chamber and the fluid storage chamber and allowing gas to flow between the pendulum storage chamber and the fluid storage chamber. The dynamic damper according to claim 1.   A biasing member is further provided to bias the viscous fluid toward the pendulum housing chamber so as to oppose centrifugal force acting on the viscous fluid flowing into the fluid housing chamber, and to return the viscous fluid to the pendulum housing chamber. The dynamic damper according to claim 1, wherein the dynamic damper is provided.   The urging member includes a piston that reciprocates in the rotational radius direction in the cylinder with the inner wall of the fluid storage chamber as a cylinder, and an elastic force that presses the piston toward the pendulum storage chamber in the rotational radius direction by an elastic force. The dynamic damper according to claim 3, comprising a member composed of a body. A first communicating hole which allows the flow of the viscous fluid and gas between the said fluid housing chamber with their said pendulum accommodating chamber is formed between the front Symbol pendulum housing chamber the fluid housing chamber,
It is formed on the inner peripheral side of the pendulum storage chamber in the rotational radius direction and allows gas to flow between the pendulum storage chamber and the outside, and allows gas to flow into the pendulum storage chamber and A second communication hole provided with a check valve for preventing the viscous fluid from flowing out of the pendulum housing;
A third communication hole formed on the outer peripheral side of the fluid storage chamber in the rotational radius direction and enabling gas to flow between the fluid storage chamber and the outside;
Dynamic damper according to claim 1, characterized in that e Bei a. Before Symbol first communicating hole and the second communicating hole and the third communication hole, the dynamic damper according to claim 5, characterized in that you are disposed in series with the radial direction of the straight line.

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