JP6330717B2 - Torsional vibration reduction device - Google Patents

Description

  The present invention relates to an apparatus for reducing torsional vibration by reciprocating motion or pendulum motion of an inertial mass body.

  This type of apparatus is described in Patent Documents 1 and 2. The devices described in these documents are such that when a torque fluctuation occurs when a disc-shaped or columnar mass body having a short axial length is pressed against a rotating member that receives torsional vibrations by a centrifugal force. The body is configured to reduce vibration by reciprocating in the circumferential direction along the rolling surface. Moreover, the structure provided with the connection member which connects the said mass bodies is described. In the apparatus described in Patent Document 1, the rolling surface is composed of a first rolling guide surface and a second rolling guide surface having different arc shapes, and these first and second rolling guides. The surfaces are continuous in the circumferential direction and are alternately formed.

JP 2014-0478805 A JP 2013-148211 A

  By the way, in the apparatus which arrange | positions a rolling element in a storage chamber and reduces a vibration by the reciprocating movement of the rolling element, the rolling element is comprised so that it can move freely within a storage chamber. Accordingly, when the rotating body rotates, the rolling element is pressed against the rolling surface by centrifugal force, and when the torque of the rotating body changes and acceleration in the rotational direction occurs, the rolling element moves along the rolling surface. . Such an operating state occurs when the rotational speed of the rotating body is high to some extent, and thus the centrifugal force acting on the rolling element is sufficient to press the rolling element against the rolling surface. In other words, when the centrifugal force is not sufficiently large, the rolling elements are in a state of falling to the lowermost part inside each storage chamber due to gravity. In the devices described in Patent Literature 1 and Patent Literature 2 described above, since the rolling surfaces are continuous over the entire circumference of the rotating bodies, a connecting member is provided to separate the rolling bodies, and the rolling bodies are Are prevented from colliding with each other and abnormal noise caused by the collision. Accordingly, there is no occurrence of dropping due to the gravity of the rolling elements due to the low rotational speed and abnormal noise resulting therefrom. However, in the apparatus including the connecting member, when supporting the connecting member, for example, when the position of the shaft support member that supports the connecting member is provided between the rolling elements, the rotation angle of the connecting member is limited, There is a risk of reducing the vibration control performance. Further, when the shaft support member is provided on the inner peripheral side from the rolling element, the connecting member may be deformed by the centrifugal force acting on the rolling element when the rotation speed of the pendulum plate is high.

  The present invention has been made paying attention to the above technical problem, and the rotation angle of the connection member is not limited, and even if the connection member is distorted by centrifugal force, the rotation of the connection member An object of the present invention is to provide a torsional vibration reduction device that can prevent the interference.

  In order to achieve the above object, according to the present invention, a plurality of guide holes are formed at predetermined intervals in a circumferential direction of the rotating body, and the rotating body rotates. In the torsional vibration reduction device in which a rolling element that rolls in the rotation direction of the rotating body when the torque fluctuates in the state of being accommodated in the guide hole, the rolling element in the rotating direction of the rotating body The sandwiching portions that are arranged on both sides of the rotating body and maintain the interval in the rotational direction of the rotating body between the rolling elements are rotatable about the rotation center of the rotating body and provided on the outer peripheral side from the guide hole A shaft support member provided integrally with the member and rotatably supporting the connecting member about the rotation center of the rotating body is provided on the outer peripheral side of the guide hole in the rotating body. A torsional vibration damping system according to.

  According to this invention, it can suppress that the damping performance of a torsional vibration falls without restrict | limiting the rotation of a connection member. Further, when the centrifugal force acting on the rolling element is large due to the high rotation speed of the pendulum plate, it is possible to prevent the connection member from rotating even when the connection member is deformed. it can.

It is a figure showing typically an embodiment of this invention. It is a figure which shows typically other embodiment of this invention. It is a figure which shows other embodiment of this invention typically. It is a figure which shows the 1st comparative example with respect to embodiment of this invention. It is a figure which shows the 2nd comparative example with respect to embodiment of this invention. FIG. 6 is a partial view of the connecting member and the shaft support member of FIG. 5.

  Next, the present invention will be described based on embodiments. FIG. 1 schematically shows a torsional vibration reducing apparatus according to this embodiment, and a plurality of rolling elements (inertial mass bodies: mass) 2 are held on a pendulum plate 1. A plurality of guide holes 3 corresponding to the accommodation chambers in the embodiment of the present invention are formed on the circumference shifted in the radial direction from the rotation center O of the pendulum plate 1. The inner wall surface of the guide hole 3 is a rolling surface 4 that reciprocates the rolling element 2. Furthermore, the inner wall surface that continues to the rolling surface 4 is a boundary surface 5 that is the limit for the rolling element 2 to reciprocate. And each rolling element 2 is connected by the connection member 6 so that it may become united in the rotation direction of the pendulum plate 1. Further, a support pin 8 corresponding to a member that pivotally supports the connecting member 6 is disposed on the outer peripheral side of the connecting member 6.

  The pendulum plate 1 is a member corresponding to the rotating body in the embodiment of the present invention, and is formed in a disk shape. The pendulum plate 1 rotates upon receiving torque and torsionally vibrates due to fluctuations in torque. The pendulum plate 1 is attached to a crankshaft of an engine (not shown) or a rotation shaft such as a propeller shaft or an axle that transmits driving force to a wheel (not shown) such that the center line of rotation is horizontal or sideways. Therefore, the pendulum plate 1 rotates in a plane along the vertical direction.

  A plurality of guide holes 3 corresponding to the accommodation chambers in the embodiment of the present invention are provided at positions shifted in the radial direction from the rotation center O of the pendulum plate 1, that is, on the circumference of a predetermined radius. It is formed side by side in the direction. In the example shown in FIG. 1, the four guide holes 3 are formed at positions facing each other on the diameter in the vertical and horizontal directions with the rotation center O in between. That is, it is formed at a position that is point-symmetric with respect to the rotation center O.

  The guide hole 3 has an appropriate shape and size that allows the rolling element 2 disposed therein to roll (reciprocate and swing) within a predetermined range, and penetrates the pendulum plate 1 in the plate thickness direction. Is formed. The shape may be a so-called long hole shape shown in FIG. 1 or a simple circular shape. Of the inner wall surface of the guide hole 3, the radially outer wall surface of the pendulum plate 1 presses the rolling element 2 by centrifugal force, and the rolling element 2 reciprocates due to torque fluctuation of the pendulum plate 1, that is, torsional vibration. It is set as the rolling surface 4 to be made. The shape of the rolling surface 4 is an arc surface having a radius smaller than the radius from the rotation center O to the rolling surface 4, that is, the radius of the pendulum plate 1, or a curved surface that approximates the arc surface. Further, the inner wall surfaces on both sides continuing to the rolling surface 4 are boundary surfaces 5 that define the guide holes 3, and the rolling element 2 is limited to the boundary surface 5 or the boundary surface 5. It is configured to roll between.

  The rolling element 2 is a member formed in a circular cross section such as a columnar shape or a disk shape having a short axial length so as to roll along the rolling surface 4. Moreover, the rolling element 2 is set so that it can roll on the rolling surface 4 without slidingly contacting the inner wall surface of the guide hole 3. Therefore, a gap exists between the outer peripheral surface of the rolling element 2 and the inner wall surface of the guide hole 3.

  Each rolling element 2 is connected by a connecting member 6 so as to be integrated in the rotation direction of the pendulum plate 1. In addition, a pinching portion 7 that is disposed on both sides of the rolling element 2 in the rotation direction of the pendulum plate 1 and maintains the interval in the rotation direction of the pendulum plate 1 of each rolling element 2 is provided integrally with the connecting member 6. Yes. Specifically, a connecting member 6 is provided on the outer peripheral side of the guide hole 3 so as to be rotatable about the rotation center O of the pendulum plate 1. And the clamping part 7 is integrally provided with the connection member 6 in the inner peripheral part of the connection member 6 with the same space | interval as the space | interval of the rolling element 2 toward the inner side in the radial direction from an internal peripheral surface. Therefore, each rolling element 2 is connected by the connecting member 6 so as to be integrated in the rotation direction of the pendulum plate 1, and in contact with the rolling surface 4 in the radial direction of the pendulum plate 1 so as to be separated from each other. Is movable. That is, the connecting member 6 and the sandwiching portion 7 integrated with the connecting member 6 are rotated by the pendulum plate 1 in a state where the center position substantially coincides with the rotation center O of the pendulum plate 1 or the axis passing through the rotation center O. It is rotatably supported.

  The connecting member 6, the sandwiching portion 7, and the four rolling elements 2 form one component 9 that is integrated in the rotation direction. As described above, since the center of the connecting member 6 substantially coincides with the center of the pendulum plate 1, when the distance from the center of the pendulum plate 1 of each rolling element 2 is the same, the constituent body The position of the center of gravity of 9 substantially coincides with the rotation center O of the pendulum plate 1 or an axis passing through the rotation center O. In addition, when the distance from the rotation center O of the pendulum plate 1 of each rolling element 2 is not the same, the position of the center of gravity of the component 9 deviates from the axis passing through the rotation center O of the pendulum plate 1, but the deviation It can be said that the center of gravity of the structure 9 substantially coincides with the rotation center O of the pendulum plate 1.

  A support pin 8 that is a shaft support member that supports the connecting member 6 is provided on the outer peripheral side of the pendulum plate 1 with respect to the guide hole 3. Specifically, it is provided between the guide holes 3 and on the outer peripheral side of the connecting member 6 connecting the rolling elements 2, and the connecting member 6 is centered on the rotation center O of the pendulum plate 1. A plurality of (as many as the guide holes 3) support pins 8 are provided at positions on the circumference having the same radius. That is, the connecting member 6 is supported by the support pins 8 so as to be rotatable about the rotation center O of the pendulum plate 1 by bringing the outer peripheral surface thereof into contact with the support pins 8. In other words, a support structure is employed in which the connecting member 6 is more accurately matched with the rotational center O of the pendulum plate 1 or the axis passing through the rotational center O of the pendulum plate 1.

  Next, the operation of the torsional vibration reducing device will be described. When the pendulum plate 1 rotates, each rolling element 2 held in the guide hole 3 rotates together with the pendulum plate 1, and centrifugal force acts on each rolling element 2. If the centrifugal force is large to some extent, each rolling element 2 moves to a position farthest from the rotation center O of the pendulum plate 1 in the rolling surface 4 and is pressed against the rolling surface 4. Further, since the rolling element 2 is integrated with the connecting member 6 in the rotational direction as described above, the connecting member 6 also rotates together with the rolling element 2.

  When the torque of the pendulum plate 1 fluctuates in this state, the pendulum plate 1 vibrates in the rotational direction (torsional vibration). Therefore, relative acceleration in the rotational direction is generated in each rolling element 2, and each rolling element 2 is caused by inertial force. Roll along the rolling surface 4. Since the rolling surface 4 is a curved surface having a small radius of curvature as described above, the inertial force of the rolling element 2 acts in a direction to suppress the vibration of the pendulum plate 1 and torsional vibration is reduced.

  When the centrifugal force acting on the rolling element 2 is small because the rotational speed of the pendulum plate 1 is low, gravity acts in the direction in which the rolling element 2 is dropped in the guide hole 3 rather than by the centrifugal force. To do. Since the rolling element 2 is connected to the connecting member 6 and is integrated with the connecting member 6 in the rotational direction of the pendulum plate 1, the rolling element 2 depends on its mass, that is, due to the weight. A moment is applied to the connecting member 6. In that case, the moment by the rolling element 2 located on either the left or right side of the center of rotation O of the pendulum plate 1 and the moment by the rolling element 2 located on the other side are moments in opposite directions. If the distance from the rotation center O of the pendulum plate 1 to each rolling element 2 is the same, the moments are the same and cancel each other. Therefore, from each rolling element 2, the connecting member 6, and the clamping part 7. The torque which rotates the said structure 9 which becomes is not produced. In other words, the center of gravity of the structure 9 is coincident with or substantially coincides with the rotation center O of the pendulum plate 1.

  Accordingly, each rolling element 2 remains held at a predetermined position in the guide hole 3, so that the rolling element 2 is prevented or suppressed from falling or colliding with the boundary surface 5 described above. Is done. That is, the collision sound by the rolling element 2 is prevented or suppressed.

  The connecting member 6 is rotatably supported by these support pins 8 by bringing the outer peripheral surface thereof into contact with these support pins 8. As a result, the connecting member 6 can be more accurately matched with the rotation center O of the pendulum plate 1 or the axis passing through the rotation center O. And by supporting the connection member 6 in this way, there is no possibility that the rotation angle of the connection member 6 is restricted. Therefore, since the clamping part 7 and the support pin 8 do not interfere with each other in the rotation direction, the rotation angle of the connecting member 6 is not limited, and it is possible to suppress a reduction in the damping performance of torsional vibration. Further, even when the connecting member 6 is deformed by the centrifugal force, the sliding resistance between the connecting member 6 and the support pin 8 does not increase, and the rotation of the connecting member 6 is not hindered.

  Next, another example of the torsional vibration reducing device according to this embodiment will be described. The above-mentioned rolling element 2 is connected by the connecting member 6 so as to be integrated in the rotation direction of the pendulum plate 1 and can move at least beyond the inside of the guide hole 3 in the radial direction of the pendulum plate 1. Good. Therefore, the outer peripheral part of the connection member 6 may not be a complete circle. That is, you may employ | adopt a slit or a groove | channel. An example is shown in FIG. The example shown in FIG. 2 is an example in which the connecting member 6 is formed with a slit 10 that opens outward in the radial direction of the pendulum plate 1. Moreover, the number of the support pins 8 which support the connection member 6 shown in FIG. 1 is not ask | required. The example shown in FIG. 3 is an example in which the connecting member 6 is supported by three support pins 8.

  In any embodiment, the same effect as the above-described embodiment can be obtained. That is, since the sandwiching portion 7 and the support pin 8 do not interfere with each other in the rotation direction, the rotation angle of the connecting member 6 is not limited, and it is possible to suppress a reduction in the damping performance of torsional vibration. it can. Even if the connecting member 6 is deformed by centrifugal force, the sliding resistance between the connecting member 6 and the support pin 8 does not increase, and the rotation of the connecting member 6 is not hindered. Furthermore, since each rolling element 2 is held by the connecting member 6 so as to rotate as a unit, a collision sound by the rolling element 2 is prevented or suppressed.

  Here, advantages of the embodiment of the present invention will be described with reference to a comparative example. 4 to 5 show an example in which the connecting member 6 is provided on the inner peripheral side from the guide hole 3. Specifically, in FIG. 4, the connecting member 6 is provided on the inner peripheral side from the guide hole 3, and the connecting member 6 is supported by the support pin 8 on the outer peripheral side of the connecting member 6. When such a configuration is adopted, the rotation angle of the connecting member 6 is limited, and the vibration damping performance may be reduced. In FIG. 5, the connecting member 6 a is provided on the inner peripheral side of the guide hole 3, and the connecting member 6 is supported by the support pins 8 on the inner peripheral side of the connecting member 6. When such a configuration is adopted, the restriction on the rotation angle of the connecting member 6 is eliminated, but when the centrifugal force acting on the rolling element 2 is large due to the high rotation speed of the pendulum plate 1. When a large centrifugal force acts on each rolling element 2, as shown in FIG. 5, the shape of the connecting member 6 is deformed by the centrifugal force, and the connecting member 6 is pushed to the support pin 8 side. Thereby, the sliding resistance between the connecting member 6 and the support pin 8 increases, and the connecting member 6 may not rotate.

  Therefore, according to the embodiment of the present invention, it does not cause the above problems. That is, since the clamping part 7 and the support pin 8 do not interfere with each other in the rotation direction, the rotation angle of the connecting member 6 is not limited, and it is possible to suppress a reduction in the damping performance of torsional vibration. Further, even when the connecting member 6 is deformed by centrifugal force, the connecting member 6 is deformed in a direction away from the support pin 8, so that the sliding resistance between the connecting member 6 and the support pin 8 may increase. Therefore, the rotation of the connecting member 6 is not hindered.

  As mentioned above, although this invention was demonstrated based on several embodiment, this invention is not limited to embodiment mentioned above. Since the vibration reduction force increases as the total mass or the total inertia moment of the rolling elements 2 increases, for example, it is not necessary that all the rolling elements 2 have the same shape or are arranged at equal intervals. The size, shape, or mass of the rolling elements 2 may be different from each other. That is, it is only necessary that the center of gravity of the structure 9 is configured to coincide with or substantially coincide with the rotation center O of the pendulum plate 1. Further, a plurality of connecting members may be provided. That is, any two or more of the plurality of rolling elements may be connected by the first connecting member, and the remaining plurality of rolling elements may be connected by the second connecting member. In addition, the torsional vibration reducing device according to the present invention may be appropriately configured without departing from the present invention.

  DESCRIPTION OF SYMBOLS 1 ... Pendulum plate, 2 ... Rolling body (inertial mass body: mass), 3 ... Guide hole, 4 ... Rolling surface, 5 ... Boundary surface, 6 ... Connecting member, 7 ... Holding part, 8 ... Shaft support member (support) Pin), 9 ... Constituent, O ... Center of rotation (of the pendulum plate).

Claims (1)

A plurality of guide holes are formed at predetermined intervals in a circumferential direction of the rotating body in the rotating body that receives torque, and the torque varies as the rotating body rotates. In the torsional vibration reduction device in which a rolling element that rolls in the rotation direction of the rotating body is accommodated in the guide hole,
In the rotational direction of the rotating body, a sandwiching portion that is disposed on both sides of the rolling body and maintains the spacing of the rolling bodies in the rotational direction of the rotating body is rotatable around the rotational center of the rotating body, and A shaft support member provided integrally with a connecting member provided on the outer peripheral side of the guide hole and rotatably supporting the connecting member around the rotation center of the rotating body is the guide hole of the rotating body. A device for reducing torsional vibration, which is provided on the outer peripheral side.

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