JP2014088898A - Torsional vibration attenuation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a torsional vibration attenuation device capable of obtaining predetermined vibration attenuation performance by stably rolling a mass body, and capable of improving durability of the mass body and a rolling surface.SOLUTION: In a torsional vibration attenuation device 1 in which a mass body 3, which reciprocating in the rotation direction of a rotor 2 by fluctuation of torque in a state of rotating the rotor 2, is provided on the outer peripheral part of the rotor 2 rotating with torque, the rotor 2 is constituted by laminating a plurality of member 2a, 2b, in which a rolling surface 5 on which the mass body 3 reciprocates by fluctuation of torque is formed, in a state of making respective rolling surfaces 5 consistent.

Description

  The present invention relates to an apparatus for attenuating torsional vibrations of a rotating body such as a crankshaft and a power transmission shaft, and more particularly to an apparatus for attenuating torsional vibrations of a rotating body by a reciprocating motion of a mass body attached to the rotating body. .

  An example of this type of device is described in Patent Document 1. In the device described in Patent Document 1, a rotating body that rotates integrally with an engine crankshaft is provided, and a plurality of guide holes are formed on the outer periphery of the rotating body so as to accommodate a mass body in a rollable manner. A guide surface functioning as a rolling surface is formed on the inner wall surface on the outer peripheral side of each guide hole. When the torsional vibration is generated in the rotating body, the torsional vibration is attenuated by the mass body reciprocating on the guide surface according to the torsional vibration.

JP-A-8-93855

  In the configuration described in Patent Document 1, the rotating body is formed by one member. Therefore, to secure the width of the guide surface for stably reciprocating the mass body, the plate thickness of the rotating body must be increased. If the guide surface is formed by punching, for example, the punching load increases as the plate thickness of the rotating body increases, which may make the processing difficult. Moreover, since the cut edge produced by the punching process is not uniform, the shape of the guide surface is different between one side and the other side of the rotating body. When the mass body reciprocates on such a guide surface, the radial load of the rotating body acting on the guide surface from the mass body or the position of the mass body in the axial direction may cause a deviation or variation. There is sex. When such a situation occurs, not only the rolling posture of the mass body is disturbed, that is, the mass body does not reciprocate while meandering on the guide surface to obtain the desired vibration damping performance, but also the mass body and the guide There is a possibility that the endurance of the surface may be abraded and the durability thereof may deteriorate. If the shaving process is performed after punching or the guide surface is formed by cutting, the guide surface can be made uniform, but the work for forming the guide surface becomes complicated and the processing cost increases. Such issues arise.

  The present invention has been made by paying attention to the above technical problem, and can stably roll the mass body to obtain the desired vibration damping performance, and the mass body and the rolling surface can be obtained. It is an object of the present invention to provide a torsional vibration damping device that can improve durability.

  In order to achieve the above object, the invention according to claim 1 is characterized in that the torque of the rotating body is changed by rotating the rotating body on the outer peripheral portion of the rotating body receiving torque and rotating. In the torsional vibration damping device provided with a mass body that reciprocates in the rotational direction, the rotating body includes a plurality of members each having a rolling surface on which the mass body reciprocates due to a change in torque. It is characterized by being constructed by laminating with the moving surfaces being matched.

  The invention according to claim 2 is the invention according to claim 1, wherein the rotating body is configured by overlapping the same processed surfaces when predetermined processing is performed on the plurality of members. This is a torsional vibration damping device.

  Further, the invention according to claim 3 is the invention according to claim 1 or 2, wherein the mass body includes a support portion having a length in an axial direction longer than a plate thickness of the rotating body, and the support portion. And a disc portion provided at each end of the support portion, and the outer peripheral surface of the support portion is disposed on the rolling surface so as to contact the rolling surface. A torsional vibration damping device characterized by the above.

  According to the first aspect of the present invention, since the rotating body is configured by stacking a plurality of members, the thickness of each member to be stacked can be reduced. For example, if the rolling surface is formed by punching a rotating body, the thickness of each member can be reduced, thereby reducing the punching load compared to punching a thick member. Can be easier. In addition, it is possible to prevent or suppress variations in processing by improving the processing accuracy of the rolling surface for each member. Since the rotating body is configured by laminating the rolling surfaces of the plurality of members so as to coincide with each other, the rolling surface is smoother or one-by-one compared to the case where the rolling surfaces are formed by punching one member. Can be done. Therefore, when the mass body reciprocates on the rolling surface, it is possible to prevent the radial load of the rotating body acting on the rolling surface, the position of the mass body in the axial direction, etc. Can be suppressed. As a result, it is possible to prevent or suppress the mass body from reciprocating while meandering on the rolling surface. That is, since the rolling posture of the mass body is stabilized, the desired reciprocating motion can be performed, and the desired vibration damping performance can be obtained. Moreover, it can prevent or suppress that the durability of those members deteriorates because it can prevent or suppress that a mass body contacts and wears the edge part of a rolling surface.

  According to the invention of claim 2, in addition to the same effect as the effect of the invention of claim 1, for example, the same processed surfaces in the case of punching a plurality of members are overlapped, so that The cut ends of the respective members can be made symmetric with respect to each other. As a result, even if the above-described deviation or variation occurs, it acts on the mass body so that the reaction force in the thrust direction is balanced, and the position of the mass body in the axial direction is automatically aligned. Can be expected. It should be noted that the same processed surfaces of the plurality of members are surfaces on which the upper die of the punching die abuts or surfaces on which the lower die abuts when punching is performed, for example.

  According to the invention of claim 3, in addition to the same effect as that of the invention of claim 1 or 2, the mass body is fitted to the rotating body, and the rolling posture of the mass body is as described above. Has been stabilized. Therefore, it can prevent or suppress that the reciprocation of a mass body is inhibited by the inner wall surface of a disc part, and the edge part of a rolling surface contacting.

It is sectional drawing which shows a part of example of the torsional vibration damping device which concerns on this invention. It is a front view which shows a part of example of the torsional vibration damping device which concerns on this invention. It is sectional drawing which shows a part of other example of the torsional vibration damping device which concerns on this invention.

  Next, the present invention will be described more specifically. FIG. 2 schematically shows an example of the torsional vibration damping device 1 according to the present invention. As an example, the rotor 2 is configured to rotate integrally with a crankshaft of an engine (not shown), a rotating shaft of a transmission, a pump impeller of a torque converter, a turbine runner, or the like. FIG. 1 is a sectional view showing a part of an example of a torsional vibration damping device 1 according to the present invention. As shown in FIG. 1, the rotating body 2 is composed of two disk-like members 2a and 2b. As will be described later, these disk-shaped members 2a and 2b are identical to each other when the above-described processing is performed in a state where the respective rolling surfaces are made coincident after forming the rolling surfaces by punching. They are integrated by overlapping the machined surfaces. The above-mentioned same processed surfaces are surfaces where the upper die of the punching die contacts or surfaces where the lower die contacts. The disk-like members 2a and 2b are both formed to have the same outer diameter, and the plate thicknesses 2at and 2bt are the same. It is designed such that the plate thickness when the disc-like members 2 a and 2 b are overlapped becomes the plate thickness 2 t of the rotating body 2. In addition, the plate thickness 2t is designed so as to be a plate thickness necessary for the mass body 3 to roll.

  The mass body 3 is attached to a portion on the outer peripheral side of the rotating body 2 at a certain interval in the circumferential direction of the rotating body 2. As shown in FIG. 1, the mass body 3 is provided with disc portions 3b having an outer diameter larger than the outer diameter of the support shaft 3a at both ends of the support shaft 3a slightly longer than the plate thickness 2t of the rotating body 2. The member having a cross-sectional shape of “H” shape. The support shaft 3a corresponds to the support portion in the present invention.

  As shown in FIG. 2, a plurality of penetrating portions 4 extending in the circumferential direction and penetrating in the plate thickness direction are formed in the outer peripheral portion of the rotating body 2 corresponding to the plurality of mass bodies 3. The through portion 4 is formed by punching as will be described later. The opening width in the radial direction of the rotating body 2 in the through portion 4 is set to be larger than the outer diameter of the support shaft 3a in the mass body 3 and smaller than the outer diameter of the disc portion 3b. Accordingly, the inner wall surface of the disk portion 3 b is caught on the side surface of the rotating body 2 so that the mass body 3 does not come out of the through portion 4.

  The inner wall surface on the outer peripheral side of the penetrating portion 4 is a surface on which the mass body 3 is pressed by a centrifugal force, and is an arc surface centering on a predetermined point shifted radially outward from the center of the rotating body 2 or its arc. It is formed in a curved surface that approximates a surface. An inner wall surface on the outer peripheral side of the penetrating portion 4 is a rolling surface 5. Therefore, the center of the rolling surface 5 in the longitudinal direction is farthest from the center of the rotator 2, and this is a neutral point, and gradually approaches the center of the rotator 2 as it is shifted to the left and right from the neutral point. It is like that. By forming the rolling surface 5 in such a shape, when the rotating body 2 rotates and a centrifugal force acts on the mass body 3, the mass body 3 is pressed against a neutral point on the rolling surface 5, and this When the torque of the rotating body 2 fluctuates in this state, that is, torsional vibration is generated, the mass body 3 reciprocates across the neutral point.

  Next, a method for forming the above-described through portion 4 will be briefly described. The penetrating part 4 is formed by punching each of the disk-shaped members 2a and 2b with a punching die constituted by an upper die called a punch and a lower die called a die. Therefore, the inner wall surface, that is, the cut end of the penetrating portion 4 has different cross-sectional shapes on the upper die side and the lower die side of the punching die. Its cross-sectional shape is, in order from the upper die side, “sag” where the punching material is curved, “shear surface” of the smooth cut, “fracture surface” where the cut surface is not smooth compared to the shear surface, It is generally called “kaeri”. In the following description, the surface of each disk-shaped member 2a, 2b that comes into contact with the upper mold is referred to as “front surface”, and the surface that comes into contact with the lower mold is referred to as “back surface”.

  The rotating body 2 includes the disk-shaped members 2a and 2b having the through-holes 4 aligned with each other in the state where the respective through-holes 4 are aligned with each other, The members 2a and 2b are integrally connected by bolts, nuts, rivets or the like (not shown). In the example shown in FIG. 1, the rotating body 2 is configured by overlapping the back surfaces of the disk-like members 2 a and 2 b. Accordingly, the outer peripheral edge of the penetrating portion 4 or the end of the rolling surface 5 in the rotating body 2 has a curved shape called “sag”. As described above, the surface formed by overlapping the back surfaces of the disk-shaped members 2a and 2b is referred to as a mating surface in the following description.

  Next, the operation of the torsional vibration damping device 1 according to the present invention described above will be described. When the rotational speed of the rotating body 2 increases and the centrifugal force generated in the mass body 3 increases, the mass body 3 is pressed against the rolling surface 5 as shown in FIG. When the torque of the rotating body 2 fluctuates in this state, the mass body 3 reciprocates or pendulums on the rolling surface 5 around the neutral point described above. The cross-sectional shape of the rolling surface 5 is symmetric with respect to the above mating surface, that is, is uniform. Further, the end of the rolling surface 5 has a shape called “sag”. Therefore, when the mass body 3 reciprocates on the rolling surface 5, there is a deviation or variation in the load in the radial direction of the rotating body 2 acting on the rolling surface 5, the position of the mass body 3 in the axial direction, or the like. Even if it occurs, since it acts on the mass body 3 so that the reaction force in the thrust direction generated in the “sag” is balanced, the position of the mass body 3 in the axial direction is automatically aligned. As a result, since the mass body 3 can perform the reciprocating motion as expected, the desired vibration damping performance can be obtained. Moreover, since the rotary body 2 is configured by laminating the respective disk-shaped members 2a and 2b, it is possible to reduce the punching load when the above-described punching process is performed on the respective disk-shaped members 2a and 2b. And the workability and processing precision of those members can be improved. In addition to this, since the punching load can be reduced, the processing cost can be suppressed, and the manufacturing cost of the torsional vibration damping device 1 can also be reduced or suppressed.

  As long as the width of the rolling surface 5 is sufficient to ensure that the mass body 3 can perform a desired reciprocating motion, the other portions of the rotating body 2 are required by the rotating body 2 in design. It is sufficient if the strength to be secured can be secured. FIG. 3 is a cross-sectional view showing an example thereof, and the thickness of each disk-shaped member 2a, 2b is reduced except for the portion constituting the rolling surface 5. Therefore, in the example shown in FIG. 3, the material cost of the torsional vibration damping device 1 according to the present invention can be suppressed.

  In the torsional vibration damping device 1 according to the present invention, the rotating body 2 is configured with the penetrating portions 4 in the respective disk-shaped members 2a and 2b being matched, and the same processed surfaces are overlapped with each other. The shape of the rolling surface 5 can be made symmetric with respect to the above mating surface. In addition, when the penetrating part 4 is formed by punching, the disk-shaped members 2a and 2b are laminated so that a cross section called “sag” is arranged outside the rotating body 2. The alignment effect described above can be expected by causing the mass body to balance the reaction force in the thrust direction. That is, it is possible to prevent or suppress the mass body 3 from reciprocating while meandering on the rolling surface 5 due to disturbance, and to obtain and maintain the desired vibration damping characteristics.

  DESCRIPTION OF SYMBOLS 1 ... Torsional vibration damping device, 2 ... Rotating body, 2a, 2b ... Disk-shaped member, 3 ... Mass body, 4 ... Penetration part, 5 ... Rolling surface.

Claims (3)

A torsional vibration damping device in which a mass body that reciprocates in the rotation direction of the rotating body when the torque fluctuates while the rotating body is rotating is provided on an outer peripheral portion of the rotating body that rotates by receiving torque. In
The rotating body is configured by laminating a plurality of members formed with rolling surfaces on which the mass body reciprocates due to fluctuations in the torque in a state where the rolling surfaces coincide with each other. Torsional vibration damping device.   The torsional vibration damping device according to claim 1, wherein the rotating body is configured by overlapping the same processed surfaces when predetermined processing is performed on the plurality of members.   The mass body has a support portion formed so that its axial length is longer than the plate thickness of the rotating body, and a disc having a larger diameter than the support portion and provided at both ends of the support portion. 3. The torsional vibration damping device according to claim 1, wherein an outer peripheral surface of the support portion is disposed on the rolling surface so as to be in contact with the rolling surface.

Images