JP2015129559A - torsional vibration reduction device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a torsional vibration reduction device capable of suppressing the inclination of a rolling element when the rolling element is moved in the axial direction.SOLUTION: In the torsional vibration reduction device, a rolling chamber storing a rolling element 4 having pendular movement with a variation in the torque of a body of rotation 1 is formed in the outer periphery of the body of rotation 1 as a penetration part 2 penetrating through the body of rotation 1 in its thickness direction. The inner face of the body of rotation 1 located outside in the radial direction of the body of rotation 1 is formed as a rolling face 3 where the rolling element 4 rolls in contact therewith. The rolling element 4 has an axially long columnar body part 7 wider than the rolling face 3, and tapered flange parts 5, 6 provided at both ends of the body part 7 and having outer diameters gradually larger as separating from the body part 7. The width of a face 10 of the rolling chamber opposed to the rolling face 3 in the radial direction of the body of rotation 1 is set to be greater than the width of the rolling face 3 and smaller than the maximum width of a tapered portion of each of the flange parts 5, 6.

Description

  The present invention relates to an apparatus for reducing torsional vibration of a rotating body by a pendulum movement of a rolling element provided on the rotating body in accordance with a change in torque of the rotating body.

  Patent Documents 1 to 3 describe a torsional vibration reduction device in which a rotating body is provided on the rotating body so as to roll while contacting the inner surface of the through hole formed in the rotating body. The rolling elements described in each of these patent documents include a main body portion that rolls in contact with the inner surface of the through hole, and a flange portion that has a larger outer diameter than the width of the through hole in the radial direction of the rotating body. Have. Patent Documents 1 and 2 describe a configuration that suppresses the rolling elements from moving in the axial direction. Specifically, the torsional vibration reduction device described in Patent Document 1 arranges a cover member and another rotating body so as to face both ends of the rolling element, and also protrudes on the central axis of the rolling element. By forming the portion on both end faces of the rolling element, the protruding part and the side wall surface of the cover member or other rotating body are in contact with each other when the rolling element moves in the axial direction. In the torsional vibration reduction device described in Patent Document 2, the rolling element is suddenly axially arranged by disposing a washer that applies an elastic force in the axial direction to the rolling element between the flange portion and the side wall surface of the rotating body. It is comprised so that it may suppress moving to or tilting. Furthermore, Patent Literature 2 and Patent Literature 3 describe that the flange portion is formed in a tapered shape so that the outer diameter gradually increases from the main body portion.

JP-A-8-93855 JP-A-8-93854 JP 2013-185598 A

  As described above, in the torsional vibration reduction device configured such that the rolling element in which the flange portion is formed in a tapered shape rolls along the inner peripheral surface on the outer peripheral side of the through hole in the radial direction of the rotating body, When the roller is rolling, the axial gap between the rotating body and the flange portion at the position in the radial direction of the rotating body where the rolling element contacts the inner wall surface of the through hole is the surface facing the inner wall surface. It becomes larger than the gap in the axial direction between the rotating body and the flange portion at the position in the radial direction of the rotating body formed with. Therefore, there is a possibility that the rolling element is inclined when the rolling element moves in the axial direction and the side wall surface of the rotating element comes into contact with the flange portion.

  This invention was made paying attention to said technical subject, and provides the torsional vibration reduction apparatus which can suppress that a rolling element inclines when a rolling element moves to an axial direction. It is the purpose.

  In order to achieve the above object, the invention according to claim 1 is characterized in that a rolling chamber containing a rolling element that moves pendulum by fluctuations in torque of the rotating body is disposed in the thickness direction of the rotating body. It is formed as a penetrating part that penetrates, and an inner surface located on the outer side in the radial direction of the rotating body among the inner surfaces of the rotating body is a rolling surface on which the rolling element comes into contact and rolls, A torsional vibration reducing device having a cylindrical main body having an axial length wider than the width of the rolling surface, and a tapered flange provided at both ends of the main body and having an outer diameter gradually increasing from the main body. The width of the surface of the rolling chamber that faces the rolling surface in the radial direction of the rotating body is larger than the width of the rolling surface and the maximum width of the tapered portion of the flange portion Is set to a smaller width than It is an.

  According to the present invention, of the rolling chambers formed through the rotating body in the thickness direction and containing the rolling elements, the radius of the rotating body with respect to the rolling surface on which the rolling elements contact and roll The width of the surface facing in the direction is larger than the width of the rolling surface, and is provided at both end portions of the main body of the rolling element, and the maximum width of the tapered flange portion where the outer diameter gradually increases from the main body. Is also set to a small width. Therefore, since the gap in the axial direction between the rotating body and the flange portion in the radial direction of the rotating body on which the surface facing the rolling surface is formed can be reduced, the rolling body moves in the axial direction and rolls. When the moving body comes into contact with the wall surface of the rotating body, the rolling body can be prevented from being inclined.

It is sectional drawing for demonstrating an example of the torsional vibration reduction apparatus which concerns on this invention. It is sectional drawing for demonstrating the other example of the torsional vibration reduction apparatus concerning this invention.

  An example of the torsional vibration reducing device according to the present invention will be described with reference to FIG. The example shown in FIG. 1 is configured to reduce torsional vibration of a plate member 1 formed in an annular shape. A through hole 2 penetrating in the thickness direction is formed in the outer peripheral portion of the plate member 1. The through-hole 2 has a predetermined length in the circumferential direction, and an inner wall surface 3 of the through-hole 2, more specifically, an inner wall surface 3 on the outer peripheral side in the radial direction of the plate member 1 is described later. The rolling element 4 is formed as a rolling surface. Hereinafter, the inner wall surface 3 is referred to as a rolling surface 3. In the example shown in FIG. 1, when a rolling element 4 described later is accommodated in the through hole 2, the through hole 2 is formed so that the flange portion 5 (6) in the rolling element 4 can pass through the through hole 2. The width of 2 is formed larger than the outer diameter of the flange portion 5 (6).

  The rolling surface 3 is formed to have a radius of curvature determined according to the order of torsional vibration to be damped, similarly to a conventionally known dynamic damper. Specifically, a value determined from the distance from the rotation center of the plate member 1 to the center of the arc constituting the rolling surface 3 and the radius of curvature of the rolling surface 3 is a torsional vibration to be damped. It is formed to be an order.

  A rolling element 4 is accommodated in the through hole 2 so as to come into contact with the rolling surface 3 by centrifugal force corresponding to the number of rotations of the plate member 1. A rolling element 4 shown in FIG. 1 includes a cylindrical main body portion 7 formed so as to be in contact with the rolling surface 3, and tapered flange portions 5, 6 integrated on both end sides of the main body portion 7. And have. The main body portion 7 is configured to roll in the circumferential direction along the rolling surface 3 by an inertial force when the torque of the plate member 1 fluctuates, and the axial length of the main body portion 7 is that of the rolling surface 3. It is formed longer than the width. On the other hand, the flange portions 5 and 6 prevent the rolling element 4 from moving in the axial direction when the axial load is applied to the rolling element 4 and preventing the rolling element 4 from detaching from the through hole 2. When the moving body 4 moves in the axial direction, the rolling body 4 is returned (aligned) to a normal position. Specifically, the flange portions 5 and 6 are formed in a tapered shape whose outer diameter gradually increases from the main body portion 7, and the outermost diameters of the flange portions 5 and 6 are the rolling surface 3 and a retainer described later. It is formed larger than the gap with 8. That is, when the rolling surface 3 comes into contact with the tapered surfaces of the flanges 5 and 6, the rolling element 3 is moved in the axial direction by the component force of the centrifugal force acting on the rolling element 3, and the rolling surface is moved from the main body 7. It is comprised so that 3 may contact.

  A retainer 8 that reduces the width of the through hole 2 by attaching the rolling element 4 to the through hole 2 described above is integrally formed on the inner wall surface 9 that faces the rolling surface 3. This retainer 8 is for suppressing the rolling element 4 from detaching from the through hole 2 in the axial direction, and the gap with the rolling surface 3 is larger than the outermost diameter of the flange portions 5 and 6 described above. It is formed to be smaller. Further, as described above, the rolling element 4 rolls along the rolling surface 3. Therefore, the rolling element 4 rolls around a position in contact with the rolling surface 3. Therefore, the gap between the retainer 8 and the rolling surface 3 is the outer diameter of the main body portion 7 in order to prevent the outer peripheral surface of the rolling element 4 from contacting the inner wall surface 9 and the frictional force acting on the rolling element 4. It is formed so as to be larger. The space formed by the through hole 2 and the retainer 8 functions as a rolling chamber that houses the rolling element 3.

  Since the outer peripheral surface of the rolling element 4 and the retainer 8 are formed with a gap as described above, when the outer peripheral surface of the main body portion 7 is in contact with the rolling surface 3, the radial direction of the plate member 1 is increased. The distance from the central axis of the rolling element 4 to the rolling surface 3 is shorter than the distance from the central axis of the rolling element 4 to the outer peripheral surface 10 of the retainer 8. Therefore, since the flange portions 5 and 6 are formed in a tapered shape, the gap L1 in the axial direction of each flange portion 5 and 6 at the position of the rolling surface 3 in the radial direction of the plate member 1 is reduced. It becomes smaller than the gap L2 in the axial direction of the flange portions 5 and 6 at the position of the outer peripheral surface 10. Therefore, in the example shown in FIG. 1, the width of the retainer 8 is formed wider than the width of the rolling surface 3, and the plate member 1 and each flange portion 5, 6 at the position where the rolling surface 3 is formed, The axial gap d1 of the retainer 8 and the axial gap d2 between the retainer 8 and the flange portions 5 and 6 at the position where the outer peripheral surface 10 of the retainer 8 is formed are configured to coincide with each other. In addition, the retainer 8 suppresses that the rolling element 4 detaches | leaves from the through-hole 2 to an axial direction as mentioned above, Therefore, the width | variety of the retainer 8 is larger than the maximum width of each flange part 5 and 6. FIG. It is formed small.

  As described above, the axial gap d1 between the plate member 1 and the flange portions 5 and 6 when the rolling element 4 is in contact with the rolling surface 3, and the axial direction between the retainer 8 and the flange portions 5 and 6. The gap d2 can be matched. Therefore, when the rolling element 4 moves to an axial direction and the plate member 1 and the retainer 8 contact the flange part 5 (6), it can suppress that the rolling element 4 inclines. As a result, it is possible to suppress a decrease in the vibration damping effect. Further, it is possible to prevent the outer peripheral surface of the main body part 7 or the rolling surface 3 from being worn due to the outer peripheral surface of the main body part 7 and the rolling surface 3 coming into contact with each other due to the inclination of the rolling element 4. it can. Furthermore, by shortening the axial distance between the retainer 8 and the flange portions 5 and 6, the kinetic energy when the flange portions 5 and 6 come into contact with the retainer 8 can be reduced. The hitting sound when 6 contacts the retainer 8 can be reduced. And, as described above, the retainer 8 which is a separate part from the plate member 1 is assembled, and by selecting and using the retainer 8, even if there is a variation in processing at the time of manufacture, the flange portion The gap between the pins 5 and 6 and the retainer 8 can be set to a predetermined gap. In other words, the processing accuracy at the time of manufacture can be reduced.

  The torsional vibration reducing device according to the present invention is only required to reduce the axial gap d2 between the retainer 8 and the flange portions 5 and 6 at the position where the outer peripheral surface 10 of the retainer 8 is formed. As described above, the axial gap d1 between the plate member 1 and the flange portions 5 and 6 at the position where the rolling surface 3 is formed, and the retainer at the position where the outer peripheral surface 10 of the retainer 8 is formed. 8 and the gap d2 in the axial direction between the flange portions 5 and 6 do not have to coincide with each other. Even in such a configuration, it is possible to prevent the rolling element 4 from being inclined by increasing the width of the retainer 8, and to strike when the flange portions 5, 6 and the retainer 8 are in contact with each other. Sound can be reduced.

  Another configuration of the torsional vibration reducing device according to the present invention is shown in FIG. In addition, about the structure similar to FIG. 1, the same referential mark is attached | subjected and the description is abbreviate | omitted. In the example shown in FIG. 2, the width of the through hole 2 is formed smaller than the outer diameter of the flange portions 5 and 6. Thus, when forming the width | variety of the through-hole 2 smaller than the outer diameter of the flange parts 5 and 6, after accommodating the main-body part 7 in the through-hole 2, either one flange part 5 (6) is made into a main body. What is necessary is just to comprise so that it may connect with a part. Retainers 11 and 12 are integrally provided on both surfaces of the plate member 1 so as to increase the width of the surface 9 facing the rolling surface 3. Thus, even when the retainers 11 and 12 are attached to the side surfaces of the plate member 1, the same effects as in FIG. 1 can be obtained.

  DESCRIPTION OF SYMBOLS 1 ... Plate member, 2 ... Through-hole, 3 ... Rolling surface, 4 ... Rolling body, 5, 6 ... Flange part, 7 ... Main-body part, 8, 11, 12 ... Retainer, 9 ... Inner wall surface, 10 ... Outer peripheral surface .

Claims (1)

A rolling chamber containing a rolling element that moves in a pendulum motion due to fluctuations in torque of the rotating body is formed as a through-hole penetrating in the thickness direction of the rotating body, and an inner surface of the rotating body Of these, the inner surface located on the outer side in the radial direction of the rotating body is a rolling surface on which the rolling element comes into contact and rolls, and the rolling body is a cylindrical main body having an axial length wider than the width of the rolling surface. And a torsional vibration reducing device having a tapered flange portion provided at both ends of the main body portion and having an outer diameter gradually increasing from the main body portion,
The width of the surface of the rolling chamber that faces the rolling surface in the radial direction of the rotating body is larger than the width of the rolling surface and larger than the maximum width of the tapered portion of the flange portion. A torsional vibration reduction device characterized by being set to a small width.

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