JP2019078278A - Pendulum-type torsional vibration reduction device - Google Patents

Abstract

To provide a pendulum-type torsional vibration reduction device which secures the tightness of a cover of rolling bodies, and can shorten an axial length of the device as a whole by a simple constitution.SOLUTION: A pendulum-type torsional vibration reduction device 1 comprises: a plurality of rolling faces 4 formed at a rotating body 2; rolling bodies 3 pressed against the rolling faces 4 by a centrifugal force, and reciprocating on the rolling faces 4 by a torque variation; a connecting member 8 for connecting the rolling bodies 3 to one another; and a cover 11 for liquid-tightly covering the rolling faces 4, the rolling bodies 3 and the connecting member 8. The rotating body 2 is accommodated in the cover 11, and connected to an inner wall face 12A of an inner wall face of the cover 11 at the outside of the rotating body 2 in a radial direction, and the connecting member 8 is arranged on a side opposite to the rotating body 2 with the rolling bodies 3 sandwiched in the radial direction of the rotating body 2 in the cover 11, and movably supported in a circumferential direction of the rotating body 2 by an inner wall face 12B of the inner wall face of the cover 11 on the inside of the rotating body 2 in the radial direction.SELECTED DRAWING: Figure 2

Description

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

  An example of this type of device is described in US Pat. In the device, a plurality of guide holes are formed at regular intervals in the circumferential direction of the rotating body at the outer peripheral portion of the rotating body which receives torque and rotates, and the torque of the torque input to the rotating body is formed in the guide hole. Rolling elements, which are inertial masses that reciprocate due to fluctuations, are respectively arranged. The respective rolling elements are coupled to move together in the circumferential direction of the rotating body by a coupling member. In addition, the above-mentioned device has a casing which covers the guide hole, the rolling element and the connecting member in a liquid-tight state, covers the outer peripheral portion of the rotating body inside the casing, and also has the guide hole and the rolling element inside thereof. And the connecting member. The inner circumferential portion of the casing in the radial direction of the rotating body is fastened to the rotating body with the rotating body held therebetween.

JP, 2016-114170, A

  In the configuration described in Patent Document 1, as described above, the rotating body is sandwiched by the inner peripheral portion of the casing to fasten them. That is, since the number of parts to be fastened increases as the rotating body, the sealing performance of the casing may be reduced. In addition, since the portion where the casing is fastened becomes thick, there is a possibility that the axial length of the entire device may become long.

  The present invention has been made in view of the above technical problems, and has a simple configuration to ensure the sealability of the cover covering the rolling elements, and to reduce the axial length of the entire device. An object of the present invention is to provide a vibration reduction device.

  In order to achieve the above object, the present invention provides a rotating body that receives torque and rotates, a plurality of rolling surfaces formed at predetermined intervals in the circumferential direction of the rotating body, and the rolling. A rolling element that reciprocates on the rolling surface in a circumferential direction of the rotating body by being pressed by a centrifugal force by a centrifugal force and a torque input to the rotating body is fluctuated; And a connecting member connected so as to move in the circumferential direction, and a cover that covers the rolling surface, the rolling element, and the connecting member in a fluid-tight manner. Is accommodated inside the cover and is connected to the radially outer surface of the rotary body among the inner wall surfaces of the cover, and the connecting member is a radius of the rotary body within the cover The rotation across the rolling element in the direction And movably supported in the circumferential direction of the rotating body by the radially inner inner wall surface of the rotating body out of the inner wall surfaces of the cover. It is

  According to the present invention, the rotating body is accommodated inside the cover, and is connected to the radially outer outer wall surface of the rotating body among the inner wall surfaces of the cover. Further, on the opposite side of the rolling element in the radial direction in the inside of the cover with respect to the rotating body, a connecting member is provided which connects the rolling elements so as to move in the circumferential direction. That is, since the rotating body is not pinched by the cover, the number of parts to be fastened is reduced as compared with the configuration described in Patent Document 1, and the sealing property of the cover can be improved. Further, the thickness of the portion where the cover is closed can be made as thin as possible, whereby the axial length of the entire device can be shortened by effectively utilizing the space in the axial direction. Further, the rolling element rotates with the rotating body and is pressed against the rolling surface by centrifugal force. And if the torque input into a rotary body is fluctuate | varied, according to the fluctuation | variation of a torque, it will reciprocate on a rolling surface. As described above, since the rolling element contacts only the rotating body, the strength and the rigidity of the cover can be reduced more than the strength and the rigidity of the rotating body, whereby the material cost of the cover can be reduced. Further, the respective rolling elements are coupled so as to move in the rotational direction by the coupling member. Therefore, when the rotating body is rotating at a rotational speed at which a centrifugal force of such magnitude as to press the rolling element against the rolling surface does not occur, the rolling located on either the left or right across the rotation center of the rotating body Even if the moving body generates a downward load by gravity, it acts on the one rolling element so that the moment due to the weight of the rolling element located at the other raises the load against the downward load. As a result, since the free movement of the rolling elements can be suppressed, it can be prevented or suppressed that the rolling elements collide with the rolling surface or that the collision noise is generated due to the collision.

BRIEF DESCRIPTION OF THE DRAWINGS It is sectional drawing which shows the pendulum type torsional vibration reduction apparatus which concerns on 1st Embodiment of this invention. It is arrow sectional drawing in alignment with the II-II line shown in FIG. It is sectional drawing which shows the pendulum type torsional vibration reduction apparatus which concerns on 2nd Embodiment of this invention. It is arrow sectional drawing in alignment with the IV-IV line shown in FIG. It is a schematic diagram explaining assembly | attachment of the rolling element and connection member with respect to the rotary body of the pendulum type torsional vibration reduction apparatus which concerns on 2nd Embodiment of this invention.

First Embodiment
The torsional vibration reduction device according to the first embodiment of the present invention reduces fluctuations in torque transmitted from a drive power source (not shown) to a drive target (not shown). It is attached on the same axis as the rotation center axis of the rotation shaft such as the input shaft of the drive target portion. The aforementioned driving power source is, for example, an engine. The drive target unit is, for example, a transmission, and a known transmission such as a stepped transmission in which the transmission ratio changes stepwise or a continuously variable transmission in which the transmission ratio can be continuously changed. It may be a machine.

  FIG. 1 is a cross-sectional view of a first embodiment of a pendulum type torsional vibration reducing device according to the present invention, and FIG. 2 is a cross-sectional view taken along line II-II shown in FIG. The pendulum type torsional vibration reducing device 1 shown in FIGS. 1 and 2 includes an annular rotating body 2 that rotates in response to a torque, and the inner circumferential surface of the rotating body 2 has a constant distance in the circumferential direction of the rotating body 2 A rolling surface 4 is formed on which the rolling element 3 is pressed by centrifugal force. In the example shown in FIG. 1, 13 rolling surfaces 4 are formed. The rolling elements 3 which are inertial mass bodies are disposed on the rolling surfaces 4 respectively. Only one rolling element 3 is shown in FIG. 1 in order to simplify the drawing.

  First, the shape of the rolling surface 4 will be described, and then the structure of the rolling element 3 will be described. The shape of the rolling surface 4 is a circular arc surface having a radius of curvature smaller than the radius of the rotating body 2 or a curved surface approximated to a circular arc surface. Therefore, the central portion in the longitudinal direction of the rolling surface 4 is the furthest from the rotation center 1A of the rotating body 2, and this is the neutral point P0. The rolling element 3 gradually approaches the rotation center 1A of the rotating body 2 as it deviates from the neutral point P0 to both end sides of the rolling surface 4. The angular range in which the rolling element 3 reciprocates in accordance with the torque fluctuation can be determined in advance by experiments or the like. In the example shown in FIGS. 1 and 2, the rolling element 3 is located at the neutral point P0.

  Further, the portions between the rolling surfaces 4 adjacent to each other form the boundary portion 5, so that the rolling elements 3 move in the circumferential direction of the rotating body 2 with the boundary portion 5 as the limit. The rotor 2 is preferably made of a metal material in order to satisfy the required strength and mass. In addition, the rotating body 2 having the above-described configuration can be formed by, for example, punching.

  The rolling element 3 is pressed against the rolling surface 4 by centrifugal force when the rotating body 2 rotates, and rolls on the rolling surface 4. Therefore, at least a portion of the rolling element 3 in contact with the rolling surface 4 has a circular cross section. Specifically, the rolling element 3 in the example shown in FIG. 1 and FIG. 2 is divided into two, and the first mass 6 and the second mass 7 assembled to the first mass 6 are divided. Have. The first mass 6 includes a hollow cylindrical shaft portion 6A and a first flange portion 6B integrally provided at one end of the shaft portion 6A. The length of the shaft portion 6A is the plate thickness of the rotating body 2 It is set slightly longer. The outer peripheral surface of the shaft portion 6A is a portion in contact with the rolling surface 4, and is pressed against the rolling surface 4 by centrifugal force. The first flange portion 6B is a disk-shaped member having an outer diameter larger than the outer diameter of the shaft portion 6A, and the first flange portion 6B is hooked on the side surface of the rotary body 2.

  The second mass 7 includes a cylindrical fitting portion 7A fitted to the inner peripheral portion of the shaft portion 6A, and a second flange portion 7B integrally provided at one end of the fitting portion 7A. The length of the joint 7A is set to substantially the same length as the axial length of the first mass 6. The second flange portion 7B is a disk-shaped member and is set to have substantially the same outer diameter as the first flange portion 6B of the first mass 6, and the second flange portion 7B is hooked on the side surface of the rotating body 2 There is. That is, the cross section of the rolling element 3 is formed in an “H” shape so as not to come out of the rotating body 2 in the axial direction. The rolling element 3 is preferably made of a metal material in order to satisfy the required strength and mass.

  The respective rolling elements 3 are connected to each other by a connecting member 8 so as to move together in the rotational direction of the rotating body 2. The connecting member 8 is, as shown in FIG. 1 and FIG. 2, in the radial direction of the rotating body 2 across the rolling element 3 on the opposite side to the rotating body 2, that is, in the radial direction of the rotating body 2. It is located inside. The connecting member 8 is provided with an annular portion 9 having a radius smaller than the radius of the rotating body 2, and each of the rolling elements 3 in the rotational direction is placed at a position corresponding to the rolling surface 4 on the outer peripheral surface of the annular portion 9. A connecting part 10 is provided which connects so as to move. That is, the same number of connecting portions 10 as the rolling surfaces 4 are formed in the annular portion 9. The length of the annular portion 9 in the axial direction of the rotating body 2 is set to be longer than the axial length of the rolling element 3. This is because, when the connecting member 8 moves in the axial direction, both end portions of the annular portion 9 in the axial direction are brought into contact with the inner wall surface of the cover described later to move the connecting member 8 in the axial direction. It is to reduce.

  The connecting portion 10 is formed in a substantially semicircular shape opened outward in the radial direction of the rotating body 2, and the rolling elements 3 are disposed in the connecting portion 10 so as to be capable of rolling. That is, the rolling element 3 is positioned between the connecting portion 10 and the rolling surface 4 in the radial direction. Specifically, the connecting portion 10 has a pair of arm portions 10A, and each arm portion 10A is curved along the outer diameter of each flange portion 6B, 7B of the rolling element 3. Further, each rolling element 3 is connected to each arm 10A in line contact or point contact, at the same radial position from the tip of each arm 10A, more precisely from the center of the annular portion 9. After all, the rolling members 3 are coupled together or moved together in the rotational direction (circumferential direction) of the rotating body 2 by the connecting member 8 having the above-described configuration, and in the radial direction of the rotating body 2 The space between the rolling surface 4 and the connecting portion 10 can be moved as a limit. Thus, the reason why each rolling element 3 is configured to be movable in the radial direction of the rotating body 2 is to prevent free rolling, that is, pendulum movement of the rolling element 3 along the rolling surface 4 It is for. The connecting member 8 is preferably formed of, for example, a synthetic resin material, in order not to inhibit the reciprocation of the rolling element 3.

  In addition, the pendulum type torsional vibration reducing device 1 includes a cover 11 that covers the rolling element 3 and the connecting member 8 in a liquid-tight state in order to shield the rolling element 3 and the connecting member 8 from external oil. The cover 11 is an annular hollow member, and an annular hollow portion which is divided by the cover 11 and accommodates the rolling element 3 and the connecting member 8 is a housing portion 12. The cross-sectional shape of the housing portion 12 is rectangular as shown in FIG. The outer peripheral surface of the rotating body 2 is integrally connected to the outer inner wall surface 12A of the inner wall surfaces of the housing portion 12 in the radial direction of the rotating body 2. The connecting member 8 is located inside the receiving portion 12 in the radial direction, and the connecting member 8 is the circumference of the rotating body 2 by the inner surface 12B in the radial direction of the inner wall surfaces of the receiving portion 12. It is movably supported in the direction. Further, the width of the cover 11 in the axial direction of the rotating body 2 is set to a width that can accommodate the rolling element 3 without the rolling element 3 contacting the inner wall surfaces 12C and 12D of the cover 11 in the axial direction.

  Specifically describing the structure of the cover 11, the cover 11 includes an annular front cover 11A located on the side of the driving power source described above and an annular rear cover 11B located on the side of the drive target portion. The portion on the outer peripheral side extends to the front cover 11A side so as to cover the outer peripheral surface of the rotating body 2. The outer surface of the rear cover 11B in the radial direction of the rotary body 2, that is, the outer inner wall surface 12A of the inner wall surfaces of the housing portion 12 described above, by a suitable joining means such as welding The outer peripheral surface of 2 is joined and integrated. The cover 11 and a driving power source (not shown) are connected so as to be able to transmit power, and the torque generated by the driving power source causes the cover 11 to rotate and the rotor 2 to rotate integrally with the cover 11 .

  On the other hand, a portion on the outer peripheral side of the front cover 11A extends in the radial direction of the rotating body 2. The surface of the outer cover of the front cover 11A on the side of the rear cover 11B and the end of the outer cover of the rear cover 11B on the side of the front cover 11A are joined and integrated by an appropriate joining means such as welding. There is.

  The portion on the inner peripheral side of the front cover 11A and the portion on the inner peripheral side of the rear cover 11B are both formed in a crank shape, and the aforementioned radius is caused by the axially extending portions of the front cover 11A and the rear cover 11B. An inner inner wall surface 12B of the inner wall surfaces of the accommodation portion 12 is formed in the direction. Further, the portions extending in the radial direction are the mounting flanges 11C and 11D which are brought into close contact with each other. With the mounting flanges 11C and 11D in close contact with each other, for example, the front cover 11A and the rear cover 11B are integrated by fastening them together with the rivets 13. In addition, the cover 11 should just be comprised so that the rotary body 2, the rolling element 3, the connection member 8, etc. which are accommodated in the inside may be shielded from the oil of the exterior, Therefore It is lower than the intensity | strength requested | required from the rotary body 2 It may be formed of a strong metal material. Further, each of the front cover 11A and the rear cover 11B constituting the cover 11 can be formed by press processing or the like.

  Therefore, according to the torsional vibration reducing device 1 having the above-described configuration, the front cover 11A and the rear cover 11B can be directly fastened to configure the cover 11 that covers the rolling elements 3 and the connecting member 8 in a liquid tight state. Therefore, compared with the configuration described in Patent Document 1, the number of parts to be fastened is small, and the sealing performance of the cover 11 and the reliability of fastening can be improved. Further, since the mounting flanges 11C and 11D are directly fastened, the thickness of the fastened portion can be reduced as much as possible. Therefore, the axial length of the entire device can be shortened by effectively utilizing the space in the axial direction. Further, in the torsional vibration reducing device 1 having the above-described configuration, the length of the rivet 13 can be shortened. The rivet 13 can be reduced in weight as much as the length of the rivet 13 is shortened. Furthermore, since the movement of the rolling element 3 in the radial direction is restricted by the rotating body 2 and the connecting member 8, it is preferable that the rotating body 2 have the rolling surface 4 against which the rolling element 3 is pressed by centrifugal force. That is, since the shape of the rotating body 2 and the shape of the cover 11 can be simplified, it becomes easy to manufacture them. Further, the weight of the rotating body 2 can be reduced. And since the mass of the rolling element 3 can increase with respect to the mass of the whole pendulum type torsional vibration reduction apparatus 1 by the ability to reduce the weight of the rotary body 2, damping performance can be improved. Furthermore, the material cost and the manufacturing cost of the rotating body 2 can be reduced.

  Further, in the pendulum type torsional vibration reducing device 1 configured as described above, the length of the annular portion 9 in the axial direction is longer than the axial length of the rolling element 3. Therefore, when the connecting member 8 moves in the axial direction due to the fluctuation of the torque transmitted to the rotating body 2, the connecting member 8 and the respective inner wall surfaces 12C and 12D contact with a small moving amount in the axial direction. As a result, since the connection member 8 and the inner wall surfaces 12C and 12D come into contact with each other in a state where the kinetic energy in the axial direction is small, it is possible to suppress the generation of abnormal noise and vibration due to the contact. Furthermore, each rolling element 3 is connected by a connecting member 8 so as to move in the rotational direction of the rotating body 2. Therefore, when the rotating body 2 is rotating at a rotational speed at which a centrifugal force of such magnitude as to press the rolling element 3 against the rolling surface 4 does not occur, either left or right across the rotation center 1A of the rotating body 2 Even if the rolling element 3 located on one side causes a downward load due to gravity, the moment due to the weight of the rolling element 3 located on any other side is located on the one side so as to rise against the downward load. It acts on the rolling element 3. As a result, it is possible to prevent or suppress the collision of the rolling element 3 with the rolling surface 4 and the generation of the collision noise due to the collision.

  Here, a method of assembling the rolling element 3 and the connecting member 8 to the rotating body 2 will be described. First, the connecting member 8 is disposed inside the rotating body 2, and the positions of the rolling surface 4 and the connecting portion 10 are matched. And at least one part of each flange part 6B, 7B is hooked on the side of the rotary body 2 in the location in which the rolling surface 4 is formed. Further, the side opposite to the point where the flanges 6B and 7B are caught on the side surface of the rotary body 2 is disposed in the connecting portion 10. As a result, the rolling element 3 is disposed obliquely between the rotating body 2 and the connecting member 8, and the connecting member 8 is axially offset from the rotating body 2, in other words, in a floating state. Then, the connecting member 8 is pushed down toward the rotating body 2, and the rotating body 2 is fitted between the flanges 6 </ b> B and 7 </ b> B of the rolling element 3. By so doing, the rolling element 3 and the connecting member 8 can be easily assembled to the rotating body 2.

Second Embodiment
Next, a second embodiment of the pendulum type torsional vibration reducing device according to the present invention will be described. FIG. 3 is a cross-sectional view of a second embodiment of the pendulum type torsional vibration reducing device according to the present invention, and FIG. 4 is a cross-sectional view taken along line IV-IV shown in FIG. The example shown in FIG. 3 and FIG. 4 is an example in which the protrusion 10B disposed in the space between the flanges 6B and 7B of the rolling element 3 is formed on the surface on the rolling element 3 side in the connecting portion 10. . That is, the thickness of the protrusion 10B in the axial direction is set shorter than the axial length of the shaft portion 6A, and the distance between the protrusion 10B and each flange portion 6B, 7B is, for example, each flange portion 6B, It is set to be longer than the distance between 7 B and the inner wall surface of the cover 11 in the axial direction. This is to prevent the rolling element 3 from being moved in the axial direction by the movement of the connecting member 8 even if the connecting member 8 moves in the axial direction. Further, the height of the protrusion 10B in the radial direction is from the outer peripheral surface of the shaft 6A to the outer peripheral edge of each flange 6B, 7B in order to avoid or suppress the contact between the protrusion 10B and the shaft 6A. It is set shorter than height or length.

  Further, in the second embodiment, the distance between the arm portions 10A is set to be narrower on the inner side of the connecting portion 10 in the radial direction of the rotary body 2, that is, on the bottom side, as compared with the first embodiment. The rolling elements 3 are configured to fit each other. This is to facilitate the assembly by fitting the rolling element 3 to the connecting portion 10 when the rolling element 3 and the connecting member 8 are assembled to the rotating body 2. In the state where the rolling element 3 and the connecting member 8 are assembled to the rotating body 2, when the rolling element 3 reciprocates along the rolling surface 4 due to the fluctuation of the torque, as described above, the tip of each arm 10A In each part, each rolling element 3 is connected to each arm 10A in a line contact or point contact. The other configuration is the same as the configuration shown in FIGS. 1 and 2, and therefore parts similar to those shown in FIGS. 1 and 2 are denoted by the same reference numerals as in FIGS. I omit it.

  A method of assembling the rolling element 3 and the connecting member 8 with respect to the rotating body 2 in the second embodiment will be described. First, the connecting member 8 is disposed inside the rotating body 2, and the positions of the rolling surface 4 and the connecting portion 10 are matched. And at least one part of each flange part 6B, 7B is hooked on the side of the rotary body 2 in the location in which the rolling surface 4 is formed. The bottom portion of the connection portion 10 according to the second embodiment is configured such that the rolling elements 3 fit in each other as described above, and therefore, the portion hooked on the side surface of the rotating body 2 in each flange portion 6B, 7B. And a part of the opposite side is fitted to the bottom of the connecting portion 10. Thereby, as shown in FIG. 5, the rolling element 3 is diagonally disposed between the rolling face 4 and the connecting portion 10, and the connecting member 8 is shifted in the axial direction with respect to the rotating body 2, in other words , Will be floating. Then, the connecting member 8 is pushed down toward the rotating body 2 and the rotating body 2 is fitted between the flanges 6B and 7B of the rolling element 3, and on the opposite side, the projections 10B are each flange 6B , 7B. Further, in the second embodiment, since the protrusion 10B is formed, it is possible to suppress that the assembled rolling element 3 is disengaged in the axial direction as compared with the first embodiment.

  Therefore, in the pendulum type torsional vibration reducing device 1 according to the second embodiment, compared to the pendulum type torsional vibration reducing device 1 according to the first embodiment, it is easy to assemble, and the work is easy. It is possible to further reduce the number of man-hours, cost and the like. Further, even in the pendulum type torsional vibration reducing device 1 according to the second embodiment, the same operation and effect as the pendulum type torsional vibration reducing device 1 according to the first embodiment can be obtained.

  In addition, this invention is not limited to each embodiment mentioned above, Comprising: It can change suitably and can be implemented in the range which claims the patent. For example, the rolling element 3 may be a simple disk or cylindrical member. The point is that the rolling element 3 may be configured to reciprocate along the rolling surface 4 due to the fluctuation of the torque when the torque is fluctuated in a state of being pressed against the rolling surface 4 by the centrifugal force.

  DESCRIPTION OF SYMBOLS 1 ... pendulum type torsion vibration reduction device, 2 ... rotation body, 3 ... rolling element, 4 ... rolling surface, 8 ... connection member, 11 ... cover, 12 A ... inner wall surface in the radial direction among the inner wall surfaces of the housing portion 12B: The inner wall surface of the inner wall surface in the radial direction among the inner wall surfaces of the housing portion.

Claims (1)

A rotating body that receives torque and rotates, a plurality of rolling surfaces formed at predetermined intervals in the circumferential direction of the rotating body, and the rolling surface are pressed by centrifugal force and input to the rotating body Of the rolling element that reciprocates on the rolling surface in the circumferential direction of the rotating body due to fluctuation of the torque, and a connecting member that moves the rolling elements so as to move in the circumferential direction of the rotating body And a cover that covers the rolling surface, the rolling element, and the connecting member in a liquid-tight manner.
The rotary body is accommodated inside the cover, and is connected to the radially outer side of the rotary body in the inner wall surface of the cover.
The connecting member is disposed on the opposite side of the rolling body in the radial direction of the rotating body inside the cover with respect to the rolling body, and the radial direction of the rotating body of the inner wall surface of the cover A pendulum-type torsional vibration reducing device characterized in that it is movably supported in the circumferential direction of the rotating body by the inner wall surface inside.

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