JP2013127286A - Torsional vibration reducing device - Google Patents

Abstract

The present invention provides a torsional vibration reduction device that can suppress an increase in the number of parts, has good assembly properties, and has excellent vibration damping capability.
In a torsional vibration reduction device 1 in which an inertial mass body 3 that attenuates torsional vibration by reciprocating due to torsional vibration of a rotating body 2 is attached by two support parts, each support part is inertial. Long hole-shaped guide holes 6 and 7 formed at both ends of the mass body 3 at the end edges, and retaining flanges 4b and 5b larger than the opening width of the guide holes 6 and 7 are formed at both ends. Support pins 4, 5 and mounting holes 8, 9 formed at positions facing guide holes 6, 7 and having an opening area that can pass through retaining flanges 4 b, 5 b and through which support pins 4, 5 are inserted. In addition, the outer portions of the mounting holes 8 and 9 are guide surfaces 8a and 9a, and the support pins 4 and 5 are sandwiched between the guide surfaces 8a and 9a and the inner surfaces 6b and 7b of the guide holes 6 and 7, respectively. .
[Selection] Figure 1

Description

  The present invention relates to an apparatus for attenuating torsional vibration, and in particular, torsional vibration reduction having a structure in which a rotating body that is rotatable relative to the rotating body is accommodated in a rotating body that receives torque. It relates to the device.

  A rotating body such as a drive shaft for transmitting torque generated by a driving force source to a target location is selectively connected to the rotating body, fluctuations in input torque, load fluctuations, or the rotating body. Vibration is unavoidably caused by a shift in the center of gravity of a device or mechanism that rotates integrally with the rotating body. Therefore, a device such as a damper for reducing torsional vibration is used for the rotating body. One example thereof is described in Patent Document 1.

  The dynamic damper described in Patent Document 1 has pin insertion holes so that each of a disk-shaped element integrated with a transmission input shaft and an inertial mass supported by the element face each other. The inertia mass body is configured to be supported by the element so that the pendulum can move by inserting cylindrical pins into the pin insertion holes facing each other. Then, the inertial mass body is caused to resonate with the torsional vibration transmitted to the element to cause a pendulum motion, and the torsional vibration is absorbed by a dynamic vibration absorption action by the pendulum motion of the inertial mass body.

German Patent Application No. 102006028556

  In the configuration described in Patent Document 1, the inertia mass body is suspended from the element by inserting the pin into the pin insertion hole of the element and the pin insertion hole of the inertia mass body. It is necessary to provide a mechanism for preventing the pin from falling out of the insertion hole. As the mechanism, for example, with the pin inserted into the pin insertion hole on the element side and the pin insertion hole on the inertial mass body side, a cover is provided on the side surface of the pin insertion hole where the end of the pin is located, Alternatively, it may be possible to provide a convex portion having a diameter larger than that of the pin insertion hole at the end of the pin. However, in the above-described example, the number of parts increases, which may increase the material cost and the processing cost for maintaining the quality of each member. In addition, by attaching the above-described mechanism, the position of the center of gravity of the inertial mass body may change, and the vibration damping performance of the dynamic damper may deteriorate.

  Therefore, for example, if the above-described convex portions are integrated with both ends of the pin, an increase in the number of parts can be suppressed, and a change in the center of gravity position of the inertial mass body can be suppressed. However, when the convex portion is integrated with the pin, the processing cost increases due to the complicated structure of the pin, or when the above-described pin is applied to the configuration described in Patent Document 1. The pin assembly method may be complicated.

  The present invention has been made paying attention to the above technical problem, and an object of the present invention is to provide a torsional vibration reduction device that can suppress an increase in the number of parts, has good assembly properties, and has excellent vibration damping capability. It is what.

  In order to achieve the above object, the invention of claim 1 is provided by reciprocating in the circumferential direction of the rotating body due to the torsional vibration at a position deviated from the rotation center of the rotating body that vibrates torsionally. In the torsional vibration reduction device in which the inertial mass body that attenuates the torsional vibration is attached so as to swing relative to the rotating body by two support portions, each of the support portions includes the inertial mass body. Are inserted into the respective guide holes and elongated guide holes formed at both ends in the reciprocating direction of the inertial mass body and opening toward the edge of the inertial mass body, respectively. A retaining flange larger than the opening width of the guide hole is formed at both ends of the supporting pin and at a position facing the guide hole in the rotating body, and passes through the retaining flange. A mounting hole through which the support pin is inserted, and a portion of the inner peripheral edge of the mounting hole that is positioned radially outward with respect to the rotation center of the rotating body is a guide surface. The inertial mass body swings on the rotating body in a state where the support pin is sandwiched between the guide surface and a surface of the inner peripheral edge of the guide hole that is located radially inward with respect to the rotation center of the rotating body. It is characterized by being attached to be possible.

  According to a second aspect of the present invention, in the first aspect of the invention, the guide surface is an arc surface that is curved outward in the radial direction with respect to the rotation center of the rotating body, and the rotating body is an inner peripheral edge of the guide hole. The torsional vibration reducing device is characterized in that the surface located radially inward with respect to the rotation center is a circular arc surface symmetrical to the guide surface across the support pin.

  According to the invention of claim 1, since the retaining flange is integrated with both ends of the support pin that substantially supports the inertial mass body on the rotating body, the increase in the number of parts and the associated material cost, An increase in processing cost can be prevented or suppressed. In addition, it is possible to prevent or suppress the change in the position of the center of gravity of the inertial mass body. Since the inertia mass body is supported by the rotating body at both ends thereof, the interval between the support portions becomes relatively wide, and the posture when the inertia mass body swings is stabilized. That is, it is possible to prevent or suppress abnormal noise from being generated or damaged due to the inertial mass body colliding with the rotating body due to so-called looseness or disturbance. Furthermore, when the inertial mass body swings, the support pin is in contact with and sandwiched between the guide surface of the mounting hole and the inner surface of the inner peripheral edge of the guide hole. These surfaces can be called rolling surfaces. Since the rolling surfaces are formed on both the rotating body and the inertial mass body in this way, the inertial mass body corresponding to the torsional vibration is compared with the case of moving on the surface formed on either side. The travel distance is increased, which makes it possible to cope with relatively large torsional vibrations. And an inertia mass body and a support pin can be assembled | attached by inserting a support pin into the inside of the long hole from the opening part of a guide hole. Moreover, since the attachment hole has an opening surface through which the retaining flange can be passed, the rotating body and the support pin can be assembled by inserting the retaining flange into the opening. As a result, according to the present invention, it is possible to obtain a torsional vibration reduction device that suppresses an increase in the number of components and the accompanying increase in material costs and processing costs, has good assembly properties, and has excellent vibration damping ability. it can.

  According to the invention of claim 2, in addition to the same effect as that of the invention of claim 1, the surface located on the inner side in the radial direction with respect to the rotation center of the rotating body on the inner peripheral edge of the guide hole is Since the arc surface is curved inward in the radial direction with respect to the rotation center of the rotating body, the center of gravity position of the inertial mass body assembled to the rotating body is set to be radially outward with respect to the rotation center of the rotating body. Can do. That is, since the inertial force of the inertial mass body can be increased, a torsional vibration reduction device having excellent vibration damping ability can be obtained.

It is a figure which shows typically an example of a structure of the torsional vibration reduction apparatus which concerns on this invention. It is a figure which shows a part of structure of the torsional vibration reduction apparatus which concerns on this invention in three dimensions. It is a figure which shows typically the process in which an inertia mass body is assembled | attached to a support plate. It is a figure which shows typically the state in which the inertial mass body reciprocates according to a torsional vibration in the torsional vibration reduction apparatus which concerns on this invention.

  Next, the present invention will be described more specifically. The torsional vibration reducing device according to the present invention is a so-called pendulum type, and is attached to a rotating body that receives torque and rotates, and a weight according to torque fluctuation and torsional vibration transmitted to the rotating body. The inertia mass body corresponding to is reciprocated, and torque fluctuations and torsional vibrations of orders equal to or substantially equal to the reciprocating order are absorbed or attenuated.

  FIG. 1 schematically shows an example of the configuration of a torsional vibration reducing device according to the present invention. Although not shown in detail, the torsional vibration reducing device 1 according to the present invention is provided on an input shaft of a transmission that is connected to a crankshaft of an engine so that power can be transmitted. The input shaft is provided on the same axis as the crankshaft. A support plate 2 constituting a part of the torsional vibration reducing device 1 according to the present invention is attached to the input shaft so as to be rotatable integrally therewith. The support plate 2 is formed in a disk shape as an example, and the inertia mass body 3 is supported on both outer peripheral surfaces of the support plate 2 via pins 4 and 5 so as to be able to reciprocate in the circumferential direction of the support plate 2. . The support plate 2 corresponds to the rotating body according to the present invention.

  In the present invention, as shown in FIG. 1, the inertia mass body 3 is a rectangular or fan-shaped weight curved as an example, and is provided on both sides of the support plate 2 as shown in FIG. At both ends of the inertial mass 3 in the circumferential direction of the support plate 2, there are openings 6 a, 7 a opened at the edges, and the reciprocating motion direction of the inertial mass 3 and the thickness of the inertial mass 3. Long hole shaped guide holes 6 and 7 are formed in the direction.

  Of the inner peripheral edges of the guide holes 6, 7, the surface located radially inward with respect to the rotation center of the support plate 2 is, for example, as shown in FIG. It is a simple arcuate surface that curves inward, that is, indents inward. On the other hand, of the inner peripheral edges of the guide holes 6 and 7, the surface located radially outward with respect to the rotation center of the support plate 2 is formed by two straight lines with the above-described center of curvature of the arc surface as an intersection. Is formed. The angle formed by these two straight lines will be described later. Then, shafts 4a and 5a of pins 4 and 5 described later are inserted through openings 6a and 7a into a space defined by the outer surface and the inner arc surface. These circular arc surfaces are brought into contact with the shaft portions 4a and 5a of the pins 4 and 5 that support the inertial mass body 3 on the support plate 2, and in addition, the inertial mass body 3 reciprocates in response to torsional vibration. In this case, the shaft portions 4a and 5a are surfaces that can be moved in the left-right direction in FIG. That is, the arc surfaces of the guide holes 6 and 7 are the rolling surfaces 6 b and 7 b of the pins 4 and 5 in the inertial mass body 3.

  Further, in the torsional vibration reducing device 1 according to the present invention, the inertial mass for reducing the torsional vibration is a combination of the set of inertial mass bodies 3 and the pins 4 and 5 described above. Note that the position of the center of gravity of the inertial mass body 3 is shown in FIG. 1 using the symbol g, and the vibration fulcrum of the inertial mass body 3 is shown in FIG.

  Further, in the example shown here, when the inertial mass body 3 assembled to the support plate 2 via the pins 4 and 5 reciprocates according to torsional vibration, the pins 4 inserted into the guide holes 6 and 7 are used. 5 is configured not to fall out from the guide holes 6 and 7. The configuration will be described more specifically. First, in the present invention, the centrifugal force generated in the inertial mass body 3 with the rotation of the support plate 2 becomes larger than the gravity acting on the inertial mass body 3, so that the inertial mass body 3 has an outer periphery of the support plate 2. A state in which the inertial mass body 3 is not vibrated is referred to as a neutral state. A location where the neutral inertia mass 3 is located on the support plate 2 is referred to as an outermost peripheral position or a starting point.

When the inertial mass body 3 in the neutral state moves from the starting point to the right side of FIG. 1 by the twist angle θ _{α in} the circumferential direction of the support plate 2, the guide hole 6 provided on the right side of FIG. shaft portion 4a of the pin 4 is adapted to be moved relative to only the above angle theta _alpha width to the left of FIG. On the other hand, in the guide hole 7 provided on the left side of FIG. 1, the shaft portion 5a of the pin 5 is adapted to be moved relative angle theta _alpha width to the left of FIG. That is, in this invention, when the inertial mass body 3 reciprocates in a predetermined torsional angle theta _alpha, shaft portion 4a of the pin 4, 5, 5a, as shown in FIG. 1, in the guide hole 6 and 7 The guide holes 6 and 7 are configured so as to reciprocate at the same angle θ _α as the twist angle θ _α . Accordingly, when the inertial mass body 3 reciprocates in a predetermined torsional angle theta _alpha following helix angle theta _beta, the inertial mass body 3, i.e., the shaft portion 4a of the pin 4, 5, 5a, the guide hole 6, 7 and reciprocates at the same angle θ _β as the twist angle θ _β described above, and the pins 4 and 5 are maintained in the guide holes 6 and 7.

On the other hand, for example, when the inertial mass body 3 attempts to reciprocate a large helix angle theta _gamma than the torsion angle theta _alpha a predetermined, specifically, the inertial mass 3 angle twist on the right side of FIG. 1 theta If you try to move in _gamma, the right side of the guide hole 6 in Figure 1, the shaft portion 4a of the pin 4 is to the relative movement by an angle theta _gamma width to the left of FIG. However, the guide hole 6 is not compatible to the vibration of the large pin 4 than the twist angle theta _alpha a predetermined, its relative movement in the circumferential direction of the support plate 2 by the wall of the left guide hole 6 of FIG. 1 Is regulated. As a result, in the guide hole 7 on the left side in FIG. 1, the movement of the pin 4 toward the left direction in FIG. The relative movement of 5 is restricted. Similarly, when the inertial mass body 3 is about to move to the left side of FIG. 1 with a twist angle _θγ , the relative movement of the pin 5 is the wall surface on the right side of the guide hole 7 of FIG. Thus, the relative movement of the pin 4 in the right guide hole 6 in FIG. 1 is restricted.

Next, the structure of each of the guide holes 6 and 7 described above will be described more specifically. Each guide hole 6 and 7 mentioned above is divided | segmented by the plane f shown in FIG. This plane f is a plane parallel to the plane connecting the center of gravity g of the inertial mass 3 arranged at the starting point and the pendulum fulcrum P of the inertial mass 3 or the rotation center of the support plate 2. As shown in FIG. 1, it is a plane that passes through the centers of curvature of the rolling surfaces 6b and 7b of the guide holes 6 and 7 of the inertial mass 3 arranged at the starting point. When the guide holes 6 and 7 are divided by the plane f, as shown in FIG. 1, the angle θ ₂ in the guide hole 6 on the right side of the plane f is set larger than the angle θ ₁ on the left side of the plane f. By doing so, the structure of the guide holes 6 and 7 in the torsional vibration reducing device 1 according to the present invention described above can be realized. Since the left side of the angle theta ₁ of the plane f is a predetermined portion corresponding to the vibration angle theta _alpha of the inertial mass body 3 described above, by setting a large angle theta ₁ to the left of the plane f, the present invention The vibration angle θ of the inertial mass body 3 that can be tolerated or dealt with by the torsional vibration reducing device 1 can be set large.

  Mounting holes 8 and 9 are formed on the outer peripheral side of the support plate 2 described above at positions facing the guide holes 6 and 7. The pins 4 and 5 are inserted into the mounting holes 8 and 9, respectively, and the shaft portions 4a and 5a of the pins 4 and 5 are brought into contact with the inner peripheral edge thereof. Specifically, as shown in FIG. 1, the shape of each mounting hole 8, 9 is an arc-shaped through hole in which a portion facing the vicinity of the end of the inertial mass body 3 is cut out. The hole has an opening area through which retaining flanges 4b and 5b of pins 4 and 5 described later can pass. Further, the outer peripheral surfaces of the inner peripheral edges of the mounting holes 8 and 9 are curved or outward in the radial direction with respect to the rotation center of the support plate 2, that is, outward in the radial direction with respect to the rotation center of the support plate 2. The surface that is recessed is a circular arc surface symmetrical to the rolling surfaces 6b and 7b of the guide holes 6 and 7 described above. The arcuate surfaces outside the mounting holes 8 and 9 are rolling surfaces 8 a and 9 a of the shaft portions 4 a and 5 a of the pins 4 and 5 in the support plate 2. Accordingly, the pins 4 and 5 are sandwiched between the rolling surfaces 8a and 9a of the mounting holes 8 and 9 and the rolling surfaces 6b and 7b of the guide holes 6 and 7 so as to be moved in the left-right direction in FIG. It has become. Further, when the mounting holes 8 and 9 are viewed from a direction parallel to the rotation axis of the support plate 2, the maximum distance between the mounting holes 8 and 9 is that of the retaining flanges 4b and 5b of the pins 4 and 5 described later. It is set larger than the outer diameter.

  The rolling surfaces 8a and 9a of the mounting holes 8 and 9 described above correspond to the guide surfaces according to the present invention. When the rolling surfaces 6b and 7b of the guide holes 6 and 7 described above are formed as a cycloid surface, the rolling surfaces 8a and 9a of the mounting holes 8 and 9 are formed in a cycloidal surface symmetrical to the rolling surfaces 6b and 7b. .

  As described above and as shown in FIG. 2, the pins 4 and 5 are provided with relatively small diameter shaft portions 4a and 5a and relatively large diameter retaining portions integrated with both ends thereof. Flange 4b, 5b is provided. As described above, the outer peripheral surfaces of the shaft portions 4a and 5a are brought into contact with the rolling surfaces 6b and 7b of the guide holes 6 and 7 and the rolling surfaces 8a and 9a of the mounting holes 8 and 9, and are sandwiched. It is supposed to be. The outer diameters of the shaft portions 4a and 5a of the pins 4 and 5 are set smaller than the maximum interval in the guide holes 6 and 7 when the guide holes 6 and 7 are viewed from a direction parallel to the rotation axis of the support plate 2. In addition, it is set to be smaller than the opening width of the openings 6a and 7a shown in FIG. As shown in FIG. 2, the retaining flanges 4 b and 5 b are formed in a flange shape as an example, and the outer diameter is when the mounting holes 8 and 9 are viewed from a direction parallel to the rotation axis of the support plate 2. Furthermore, it is set larger than the maximum interval in the guide holes 6 and 7.

  In the above-described configuration, the support plate 2 and the pair of inertia mass bodies 3 provided on both sides thereof are coupled via the pins 4 and 5 so as to be relatively movable. In other words, the inertial mass body 3 is suspended from the support plate 2 at two locations by the pins 4 and 5. Therefore, the portion where the inertial mass body 3 is attached to both sides of the outer periphery of the support plate 2 is in a state in which three plates are arranged in parallel at predetermined intervals as shown in FIG. It has become. The shaft portions 4a and 5a described above correspond to the support pins according to the present invention. The pins 4 and 5 described above, the mounting holes 8 and 9 of the support plate 2, and the guide holes 6 and 7 of the inertia mass body 3 are provided. Corresponds to the support portion according to the present invention.

  Next, a method of assembling the inertia mass body 3 having the above-described configuration on both sides of the support plate 2 will be described. First, a set of inertial mass bodies 3 having the above-described configuration is prepared. The shaft portion 4a of the pin 4 is inserted into the guide hole 6 of one inertia mass body 3 through the opening 6a, and one retaining flange 4b of the pin 4 is passed through the mounting hole 8 of the support plate 2. Then, the shaft portion 4 a of the pin 4 is inserted into the mounting hole 8. And the axial part 4a of the pin 4 is made to contact the rolling surface 8a of the attachment hole 8, as shown in FIG. On the other hand, one retaining flange 5 b of the pin 5 is passed through the mounting hole 9 of the support plate 2 and the shaft portion 5 a of the pin 5 is inserted into the mounting hole 9. Then, the shaft portion 5a of the pin 5 is inserted into the guide hole 7 by passing through the opening portion 7a of the guide hole 7, and is disposed on the rolling surface 7b side of the guide hole 7 as shown in FIG. . That is, the inertia mass body 3 is brought into a cantilever state as shown in FIG.

  In the above-described cantilever state, the pin 4 is sandwiched between the rolling surface 6b of the guide hole 6 and the rolling surface 8a of the mounting hole 8 as shown in FIG. It has become. On the other hand, as shown in FIG. 3, the pin 5 is movable in a space defined by the outer surface of the guide hole 7 and the inner surface of the mounting hole 9. Therefore, when the inertial mass body 3 is assembled on the other side of the support plate 2, in this cantilever state, the pin 5 is inserted after the shaft portion 4 a of the pin 4 is inserted into the guide hole 6 of the other inertial mass body 3. The shaft portion 5a of the pin 5 is inserted into the guide hole 7 of the other inertia mass body 3 by moving in the space described above. Next, the pin 5 and the set of inertial mass bodies 3 are moved upward in FIG. 3 to cancel the cantilever state, whereby the assembly of the set of inertial mass bodies 3 is completed. That is, the state shown in FIG. 1 is obtained.

  Note that the cantilever state shown in FIG. 3 is one of the transient states in the process of assembling the pins 4 and 5 and the inertial mass body 3 to the support plate 2 and is also a state intentionally generated. be able to. Specifically, although not shown in detail, the centrifugal force generated in the inertial mass 3 is reduced due to the slow rotation speed of the support plate 2, and therefore the inertial mass 3 is arranged at the outermost peripheral position. If not, the end of the inertial mass 3 on the guide hole 6 side is, for example, arranged outside in the radial direction of the support plate 2, and the end of the guide hole 7 side is arranged inside in the radial direction of the support plate 2. The In this state where the inertial mass body 3 is inclined, the pin 5 is supported on the inner peripheral edge of the guide hole 7 in the radial direction with respect to the rotation center of the support plate 2 and on the inner peripheral edge of the mounting hole 9. The center of rotation of the plate 2 is sandwiched between the inner surface in the radial direction. That is, when the centrifugal force generated in the inertial mass body 3 is small, the inertial mass body 3 is inclined with respect to the state shown in FIG. 3, and is less likely to be in the state shown in FIG. Therefore, in this invention, it is prevented or suppressed that the inertial mass body 3 will be in the cantilever state shown in FIG. 3 mentioned above. As a result, the inertial mass body 3 is in the cantilever state shown in FIG. 3, and for example, the pin 5 is prevented or suppressed from falling out of the guide hole 7.

Therefore, in the torsional vibration reduction device 1 configured as described above, the shaft portions 4a and 5a that substantially support the inertial mass body 3 on the support plate 2 so as to be able to reciprocate, and the retaining flanges 4b and 5b are integrated. Therefore, it is possible to prevent or suppress an increase in the number of parts and the accompanying increase in material costs and processing costs. Thereby, the change of the position of the gravity center g of the inertial mass body 3 can be prevented or suppressed. Furthermore, if a and the inertial mass 3 in a case where the inertial mass body 3 swings swing greater than a predetermined torsional angle theta _alpha in accordance with the torsional vibration, the guide holes in the circumferential direction of the support plate 2 6 , 7 functions as a stopper on the inner wall surface on the opposite side to the openings 6a, 7a, thereby preventing or suppressing the pins 4, 5 from coming off in the circumferential direction. In addition to this, the cantilever state shown in FIG. 3 described above is one of the transient states in the assembly process, and is a state intentionally generated, so that the centrifugal force generated in the inertial mass body 3 is reduced. Even if it becomes smaller, for example, the pin 5 can be prevented or suppressed from falling out of the guide hole 7.

  In addition to these, the rolling surfaces 6b and 7b in the guide holes 6 and 7 are curved inward in the radial direction with respect to the rotation center of the support plate 2 as described above. The position of g can be arranged on the outer peripheral side in the radial direction of the support plate 2. Thereby, the inertial force generated in the inertial mass body 3 can be relatively increased. In addition, since the inertial mass 3 is suspended from the support plate 2 at both ends thereof, the distance between the pin 4 and the pin 5 can be widened, thereby stabilizing the posture when the inertial mass 3 swings. be able to. That is, when the inertial mass body 3 is swung, abnormal noise or vibration is generated due to collision between the inertial mass body 3, the pins 4, 5 and the support plate 2 due to disturbance or the like, or damage is caused. This can be prevented or suppressed. Moreover, since the rolling surfaces are formed on both the support plate 2 and the inertial mass body 3, the deflection width or deflection angle of the inertial mass body 3 associated with torsional vibration can be relatively increased. As a result, according to the torsional vibration reduction device 1 according to the present invention, an increase in the number of parts and the accompanying increase in material cost and processing cost are suppressed, and the torsional vibration is excellent and the vibration damping ability is excellent. The vibration reducing device 1 can be obtained.

  The operation of the above-described torsional vibration reducing device 1 according to the present invention will be described. The torsional vibration reducing device 1 having the above-described configuration is mounted on a vehicle, and the crankshaft rotates when the engine of the vehicle is started. When the operation starts, the input shaft connected to the crankshaft so as to transmit power also starts to rotate. As described above, since the support plate 2 is integrated with the input shaft, the support plate 2 also rotates as the input shaft rotates. When the rotation speed of the crankshaft increases, the rotation speed of the input shaft also increases, and the rotation speed of the support plate 2 also increases. Then, a centrifugal force corresponding to the number of rotations of the support plate 2 is generated in the inertial mass 3, and the inertial mass 3 becomes larger than the gravity acting on the inertial mass 3 as shown in FIG. Then, it moves to the outer peripheral side of the support plate 2, that is, the outermost peripheral position or the starting point. When the torsional vibration is transmitted to the support plate 2, the pair of inertia mass bodies 3 suspended from the support plate 2 via the pins 4 and 5 resonate with the torsional vibration, and are shown in FIG. Thus, it reciprocates in the rotation direction of the support plate 2. That is, in the torsional vibration reducing device 1 according to the present invention, the torsional vibration is attenuated by the dynamic vibration absorbing action caused by the set of inertia mass bodies 3 configured as described above resonating with the torsional vibration and swinging.

  DESCRIPTION OF SYMBOLS 1 ... Torsional vibration reduction device, 2 ... Support plate, 3 ... Inertial mass body, 4, 5 ... Pin, 4a, 5a ... Shaft part, 4b, 5b ... Retaining flange, 6, 7 ... Guide hole, 6a, 7a ... Opening, 6b, 7b ... rolling surface of guide hole, 8, 9 ... mounting hole, 8a, 9a ... rolling surface of mounting hole.

Claims (2)

An inertia mass body that attenuates the torsional vibration by reciprocating in the circumferential direction of the rotating body due to the torsional vibration at a location deviated from the rotation center of the rotating body that vibrates torsionally is supported by two support portions. In the torsional vibration reducing device attached to swing relative to the rotating body,
Each of the support parts is
Elongated guide holes that are formed at both ends of the inertial mass body in the reciprocating direction, and are formed at the edges of the inertial mass body and toward the reciprocating direction, respectively.
A support pin inserted into each guide hole and having a retaining flange formed at both ends larger than the opening width of the guide hole;
A mounting hole formed in a position facing the guide hole in the rotating body, having an opening area through which the retaining flange can be passed, and through which the support pin is inserted;
Of the inner peripheral edge of the mounting hole, the portion located on the outside in the radial direction with respect to the rotation center of the rotating body is a guide surface
The inertial mass body swings on the rotating body in a state where the support pin is sandwiched between the guide surface and a surface of the inner peripheral edge of the guide hole that is located radially inward with respect to the rotation center of the rotating body. A torsional vibration reduction device characterized in that it is attached in a possible manner. The guide surface is an arc surface curved outward in the radial direction with respect to the rotation center of the rotating body,
The surface located radially inward with respect to the rotation center of the rotating body in the inner peripheral edge of the guide hole is an arc surface symmetrical to the guide surface with the support pin interposed therebetween. The torsional vibration reducing device described in 1.

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