JP2017133549A - Torsional vibration reduction device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a torsional vibration reduction device capable of increasing the weight of a rolling element and rolling the rolling element smoothly without slippage along the rolling face.SOLUTION: A torsional vibration reduction device comprises: a rotary plate 1 for rotating in response to a torque; a rolling chamber 2 formed at a predetermined spacing in the circumferential direction of the rotary plate 1; a rolling face 4 formed in the inner circumference of the rolling chamber 2 radially of the rotary plate 1 and on the internal surface of the outer side; a rolling element 3 arranged in the rolling chamber 2 and made reciprocally rollable along the rolling face 4 in response to the fluctuations of the torque. The rolling element 3 includes: an inside member 3A disposed on the rotation center side; and an outside member 3B disposed on the outer side of the inside member 3A, and the specific gravity of the inside member 3A is larger than the specific gravity of the outside member 3B.SELECTED DRAWING: Figure 1

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 to 3. In these apparatuses, the rolling elements are arranged inside rolling chambers formed at regular intervals in the circumferential direction of the rotating body. Of the inner wall surface of the rolling chamber, a rolling surface is formed on the outer inner wall surface in the radial direction of the rotating body. When the rotating body rotates, the rolling element disposed in the rolling chamber rotates together with the rotating body, and a centrifugal force acts on each rolling element. Each rolling element is pressed against the rolling surface by the centrifugal force. Thus, when the torque varies with the rotating body rotating, the rotating body vibrates in the rotation direction. As a result, relative acceleration in the rotational direction is generated in each rolling element, and each rolling element rolls along the rolling surface by inertial force. The inertial force of the rolling element acts in a direction to suppress the vibration of the rotating body, and torsional vibration is reduced. The rolling element described in Patent Document 1 is formed in a cylindrical shape, and the rolling element described in Patent Document 2 includes a cylindrical support shaft portion and flanges provided on both sides of the support shaft portion in the axial direction. And the cross-sectional shape forms an “H” shape. The outer peripheral surface of the support shaft portion is pressed against the rolling surface. One flange portion is formed integrally with the support shaft portion, and the other flange portion is attached to the support member. That is, the rolling element described in Patent Document 2 is formed by being divided in the axial direction. The rolling element described in Patent Document 3 is also configured in substantially the same manner as the rolling element described in Patent Document 2.

JP 2012-197886 A Japanese Patent Laid-Open No. 2015-230368 Japanese Patent Laying-Open No. 2015-102228

  In the vibration damping device configured to roll a rolling element, the vibration damping performance improves as the rolling element rolls smoothly on the rolling surface and the mass of the rolling element increases. In the configurations described in Patent Document 1 to Patent Document 3, when the mass of the rolling element is increased in order to improve the vibration damping performance, the outer diameter of the rolling element is increased accordingly. That is, the rolling inertia force of the rolling element is increased. As a result, it may slip without rolling with respect to the rolling surface, and the desired vibration damping performance may not be obtained.

  This invention is made paying attention to said technical subject, and while increasing the mass of a rolling element, it is possible to roll the rolling element smoothly and without slipping along the rolling surface. An object of the present invention is to provide a torsional vibration damping device that can be used.

  In order to achieve the above object, the present invention provides a rotating plate that receives torque and rotates, a rolling chamber formed at regular intervals in a circumferential direction of the rotating plate, and an inner wall surface of the rolling chamber. A rolling surface formed on the outer inner wall surface in the radial direction of the rotating plate, and reciprocatingly rolling along the rolling surface according to the variation of the torque and disposed in the rolling chamber. In the torsional vibration reduction device including a rolling element that reduces torsional vibration due to the fluctuation of the torque, the rolling element is provided on an inner member provided on the rotation center side and provided on the outer side of the inner part. An outer member, and the specific gravity of the inner portion is greater than the specific gravity of the outer portion.

  According to this invention, the rolling element is pressed against the rolling surface by the centrifugal force generated by the rotation of the rotating plate. When torsional vibration is generated in the rotating plate in this state, the rolling element reciprocates along the rolling surface, and the torsional vibration of the rotating plate is attenuated or reduced. The rolling element according to the present invention includes an inner member provided on the rotation center side and an outer member provided on the outer side, and the specific gravity of the inner portion is greater than the specific gravity of the outer portion. That is, the total mass of the rolling elements is increased without increasing the outer diameter of the rolling elements. In other words, an increase in rolling inertia force of the rolling element is suppressed with respect to an increase in mass. As a result, according to the present invention, the mass of the rolling element can be increased, and the rolling element can be smoothly rolled while avoiding or suppressing slippage of the rolling element, thereby improving the vibration damping performance.

It is a front view which shows a part of example of the torsional vibration reduction apparatus which concerns on embodiment of this invention. It is sectional drawing which follows the II-II line | wire shown in FIG. It is sectional drawing which shows an example of the rolling element in embodiment of this invention.

  Next, the present invention will be described based on embodiments. The torsional vibration reducing device according to the embodiment of the present invention is a torsional vibration of a rotating plate caused by torque fluctuation by causing a rolling element attached to the rotating plate to which torque is input to roll back and forth according to the torque fluctuation. It is comprised so that may be reduced or suppressed. FIG. 1 is a front view showing a part of an example of a torsional vibration reducing apparatus according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along line II-II shown in FIG. In the example shown here, the rotating plate 1 is an annular or disk-shaped plate, and a rotating shaft such as an engine crankshaft (not shown) or a propeller shaft or an axle for transmitting driving force to a wheel (not shown) at the center thereof. Are connected. That is, the rotating plate 1 and the above-described rotating shafts are arranged coaxially.

  Rolling chambers 2 are formed at regular intervals on the circumference of the same radial position from the rotation center O of the rotating plate 1. These rolling chambers 2 are formed through the rotating plate 1 in the thickness direction. A rolling element 3 is arranged in each rolling chamber 2. Each rolling chamber 2 is formed in an appropriate shape and size so that the rolling elements 3 disposed therein can reciprocate within a predetermined range. The shape may be the long hole shape shown in FIG. 1 or a simple circular shape.

  As shown in FIG. 2, the rolling element 3 includes a columnar shaft portion 3A provided on the rotation center side and a cylindrical portion 3B provided outside the shaft portion 3A. It is formed in a column shape. 3 A of axial parts are corresponded to the inner member in embodiment of this invention, and are comprised by the material with large specific gravity compared with the material which comprises the cylindrical part 3B. The cylindrical portion 3B corresponds to the outer member in the embodiment of the present invention. The shaft portion 3A is made of a so-called high specific gravity material, and examples of the high specific gravity material include tungsten, a compound thereof, an alloy, or a synthetic resin material containing them. The cylindrical portion 3B is made of a conventionally known material such as steel. With such a configuration, the total mass of the rolling elements 3 can be increased without increasing the outer diameter of the rolling elements 3. That is, an increase in the rolling inertia force of the rolling element 3 can be suppressed with respect to an increase in the mass of the rolling element 3. Therefore, in the above configuration, even if the total mass of the rolling elements 3 is large, the rolling elements 3 can reciprocate according to the vibration of the rotating plate 1. That is, the rolling of the rolling element 3 can be suppressed and smoothly rolled.

  The outer diameter of the cylindrical portion 3B is set to be slightly smaller than the dimension of the portion having the narrowest opening width in the rolling chamber 2. This is because the rolling element 3 can roll on the rolling surface 4 without slidingly contacting the rolling surface 4 described later. Therefore, there is a gap between the outer peripheral surface of the rolling element 3 and the inner wall surface of the rolling chamber 2. In the example shown in FIG. 2, the axial length of the rolling element 3 is set to be longer than the thickness of the rotating plate 1, but the rolling length is set by setting the axial length of the rolling element 3 to be shorter than the thickness of the rotating plate 1. The rolling element 3 may be accommodated in the moving chamber 2.

  Of the inner wall surface of the rolling chamber 2, the inner wall surface on the outer peripheral side in the radial direction of the rotating plate 1 has a rolling surface 4 on which the rolling element 3 is pressed by centrifugal force and the rolling element 3 is reciprocally rolled by torque fluctuation. It has become. The shape of the rolling surface 4 is an arc surface having a radius of curvature smaller than the radius of the rotating plate 1 or a curved surface approximating an arc surface. Inner wall surfaces on both sides following the rolling surface 4 serve as boundary surfaces 5 that partition the rolling chambers 2. The rolling element 3 is configured to roll on the boundary surfaces 5 or between the boundary surfaces 5. 1 and 2 show a state where the rolling element 3 is pressed against the rolling surface 4 by centrifugal force.

  Next, the operation of the torsional vibration reducing device having the above configuration will be described. When the rotating plate 1 rotates, the rolling elements 3 arranged in the rolling chamber 2 rotate together with the rotating plate 1, and a centrifugal force acts on each rolling element 3. If the centrifugal force is large to some extent, each rolling element 3 moves to a position farthest from the rotation center O of the rotating plate 1 on the rolling surface 4 as shown in FIG. 1 and FIG. The outer peripheral surface of the cylindrical portion 3 </ b> B is pressed against the rolling surface 4.

  When the torque of the rotating plate 1 fluctuates while the rotating plate 1 is rotating, the rotating plate 1 vibrates in the rotational direction (torsional vibration). Thereby, the relative acceleration of a rotation direction arises in each rolling element 3, and each rolling element 3 rolls along the rolling surface 4 with an inertial force. Since the rolling surface 4 is a curved surface with a small radius of curvature as described above, the position of each rolling element 3 in the radial direction of the rotating plate 1 changes. Such changes are repeatedly caused by torque fluctuations. The inertial force of the rolling element 3 acts in a direction to suppress the vibration of the rotating plate 1, and torsional vibration is reduced.

  In the embodiment of the present invention, since the shaft portion 3A of the rolling element 3 is made of a material having a higher specific gravity than the cylindrical portion 3B, the total mass of the rolling element 3 is not increased without increasing the outer diameter of the rolling element 3. Can be increased. That is, an increase in rolling inertia force is suppressed with respect to an increase in mass. As a result, the rolling element 3 can be prevented from slipping and the rolling element 3 can be smoothly reciprocated along the rolling surface 4 to improve the vibration damping performance. Moreover, in the structure mentioned above, in addition to the dimension of the rolling element 3, the curvature of the rolling surface 4, etc., the specific gravity of the shaft part 3A and the composition ratio of the shaft part 3A and the cylindrical part 3B are changed. Since the total mass can be changed, the degree of design freedom as a whole can be improved. Furthermore, since only the shaft portion 3A is configured by a high specific gravity member, an increase in material cost due to the use of the high specific gravity member can be suppressed. Moreover, since the high specific gravity member is covered with the cylindrical portion 3 </ b> B, it does not contact the rolling surface 4. That is, it is possible to improve the durability of the shaft portion 3A constituted by the high specific gravity member.

  FIG. 3 is a cross-sectional view showing an example of a rolling element in the embodiment of the present invention. In the example shown here, the rolling element 30 is composed of a plurality of members. The rolling element 30 includes a first mass 31 and a second mass 32. The first mass 31 has a cylindrical shaft portion 31A and one end portion in the axial direction, the center of which is substantially the axis of the shaft portion 31A. And one flange portion 31B provided so as to coincide with each other. The outer peripheral surface of the shaft portion 31A is pressed against the rolling surface 4 described above by centrifugal force. The axial length of the shaft portion 31A is set to be longer than the plate thickness of the rotating plate 1, and the outer diameter of the shaft portion 31A is set to be slightly smaller than the dimension of the portion with the narrowest opening width in the rolling chamber 2. The inner diameter of the shaft portion 31A is set to be substantially the same as the outer diameter of the convex portion 32A described later.

  The second mass 32 includes a columnar convex portion 32A and the other flange portion 32B provided at one end portion in the axial direction so that the center thereof substantially coincides with the axial line of the convex portion 32A. The outer diameter of the convex portion 32A is set to be substantially the same as the inner diameter of the shaft portion 31A described above, and the shaft portion 31A is inserted into the shaft portion 31A so that the first mass 31 and the second mass 32 are integrated. .

  The outer diameters of the flange portions 31 </ b> B and 32 </ b> B are set larger than the width of the rolling chamber 2 in the radial direction of the rotating plate 1. This is because the flange portions 31B and 32B are hooked on both side surfaces of the rotating plate 1 when the rolling element 30 moves in the axial direction. By carrying out like this, it can suppress that the rolling element 30 slips out from the rolling chamber 2 to the axial direction.

  In the configuration shown in FIG. 3, since the convex portion 32A is provided on the rotation center axis side of the rolling element 30 and the shaft portion 31A is provided on the outer side thereof, the second mass 32 is configured by a high specific gravity member. The first mass 31 is made of a conventionally known steel material. With such a configuration, the inner specific gravity increases in the radial direction as the entire rolling element 30, and the outer specific gravity decreases. Therefore, even if it is the structure mentioned above, increase of the rolling inertia force of the rolling element 30 can be suppressed, and the effect | action and effect similar to the structure shown in FIG. 1 can be acquired.

  DESCRIPTION OF SYMBOLS 1 ... Rotating plate, 2 ... Rolling chamber, O ... Rotation center of rotating plate, 3 ... Rolling body, 3A ... Shaft part (inner part in radial direction of rolling element), 3B ... Cylindrical part (radial direction of rolling element) Outer part), 4 ... rolling surface.

Claims (1)

A rotating plate that rotates upon receiving torque, a rolling chamber formed at regular intervals in a circumferential direction of the rotating plate, and an inner wall surface that is radially outer of the rotating plate among the inner wall surfaces of the rolling chamber And a rolling surface disposed in the rolling chamber and reciprocatingly rolled along the rolling surface according to the torque variation to reduce torsional vibration caused by the torque variation. In a torsional vibration reduction device comprising a moving body,
The rolling element includes an inner member provided on the rotation center side, and an outer member provided outside the inner portion,
The torsional vibration reduction device according to claim 1, wherein the specific gravity of the inner portion is greater than the specific gravity of the outer portion.

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