JP6565725B2 - Method for manufacturing vibration reducing device - Google Patents

Description

  The present invention relates to a method of manufacturing a vibration reducing device for reducing torsional vibration, and in particular, manufacturing a vibration reducing device in which a rotating body that receives torque is rotated and contains a rolling element that can rotate relative to the rotating body. It is about the method.

  Patent Document 1 discloses an annular support member, guide holes (rolling chambers) provided at equal intervals in the support member, and a mass body that is held inside the guide hole so as to be rotatable relative to the support member. A centrifugal pendulum vibration absorber (pendulum damper) provided with (rolling element) is described. The pendulum damper of Patent Document 1 is attached to a rotating shaft to which engine output torque is input. When the rotating body vibrates in the rotation direction, the rolling element swings the rolling chamber, thereby suppressing torsional vibration generated on the rotating shaft.

JP 2012-77827 A

  The rolling surface of the pendulum damper described in Patent Document 1 may be formed to be a curved surface along a cycloid curve in order to reduce a predetermined order of vibration. In the processing of the rolling surface, first, a hole is made at a location where the rolling chamber of the rotating body is formed by pressing or the like. A cutting tool such as an end mill is pressed against a predetermined inner surface of the hole, and the cutting tool is moved along a cycloid curve. In that case, the cutting tool is sent in one direction to perform processing, and therefore the cutting tool presses against a predetermined end of the hole to start cutting, and then moves toward the other end of the hole to perform the processing. finish.

  The said hole formed in a rough shape material is a long hole about the length of a rolling surface. Therefore, when the rolling surface is cut by the cutting tool, the cutting tool has to come into contact with the portion adjacent to the rolling surface at the portion at the beginning of cutting and the portion at the end of cutting. Therefore, the amount of cutting increases at the cutting start part and the cutting end part of the rolling surface compared to other parts. As the amount of cutting increases, the cutting resistance increases correspondingly, and in the end mill, the radial load applied to the tip side of the tool increases, so that the cutting tool is easily bent. Since such bending reduces the accuracy of the machined surface, with the conventional machining method, the rolling surface does not follow the design-defined cycloid curve, and as a result the vibration damping of the resulting vibration damping device The characteristics may deteriorate, or the desired vibration damping characteristics may not be obtained.

  The present invention has been made paying attention to the technical problem described above, and when the rolling surface is processed to be a curved surface along a cycloid curve by a cutting tool such as an end mill, the cutting accuracy deteriorates. An object of the present invention is to provide a method of manufacturing a vibration reducing device that can be suppressed.

In order to solve the above problems, the present invention forms a rolling chamber long in the circumferential direction of the rotating body at a location deviated from the rotation center of the rotating body that receives torque and rotates, and the rolling chamber rolling inner peripheral surface caries Chi, according to the oscillation of the torque by switching cutting with a cutting tool such that the curved surface of the outer inner peripheral surface along a cycloid which is located outside in the radial direction of the rotary body In a manufacturing method of a vibration reducing device, which is formed on a rolling surface on which a moving body swings and is manufactured by attaching the rolling body to the rolling chamber, prior to cutting the outer peripheral surface with the cutting tool. the a radius of curvature greater than the radius of the cutting tool to each of both end portions in the front Kisotogawa peripheral surface of the circular circumferential direction, and the imaginary line extending the rolling surface in the circumferential direction Including the outer part in the radial direction Forming a notch, then an intersection of the pre-Symbol the cutting tool inserted into the notch of either the notch, the one notch and the front Kitendo surface bordering the field unit the send cutting tool notch of the prior SL notch sac Chino other direction from the notch of the one in the circumferential direction as a cutting start end, Shi switching cutting the outer inner peripheral surface those characterized that you form the rolling surface Te.
A width between the outer peripheral surface and the rolling surface in the radial direction may be smaller than a radius of the cutting tool.

According to the present invention, when the rolling surface is machined to be a curved surface along the cycloid curve, a notch portion is provided at each of the site where the cycloid curve machining is started and the site where the cycloid curve machining is finished. Is formed. Notch is formed with a radius by Ri large radius of curvature of the cutting tool to form a cycloid. Therefore, when machining so that the rolling surface is a curved surface along the cycloid curve, first, the cutting tool is inserted into one of the notches. And it is processed into the curved surface along a cycloid curve by sending a cutting tool, cutting in the circumferential direction toward the other notch part from one notch part. Since the above-described notch portion, which is a so-called escape portion, is formed at the start portion and the end portion of such cutting, the cutting tool comes into contact with the portion to be processed as a rolling surface and is adjacent to the portion. Do not touch the point. Such a cutting state is the same as the state of cutting the intermediate portion of the rolling surface, and therefore the load or cutting resistance applied to the cutting tool is substantially the same over the entire rolling surface. As a result, cutting conditions such as bending of the cutting tool do not change particularly during the cutting of the rolling surface, so that the rolling surface can be processed with high accuracy as designed.

It is a figure for demonstrating the rotary body of the pendulum damper in embodiment of this invention. It is a view to view an enlarged holding chamber pendulum damper shown in FIG. It is a figure for demonstrating the feed of an end mill at the time of processing the rolling surface of the pendulum damper in this Embodiment into the curved surface which follows a cycloid curve.

Hereinafter, an example of the manufacturing method of the pendulum damper according to the present invention will be described. FIG. 1 shows a damper plate 1 corresponding to a rotating body of a pendulum damper according to an embodiment of the present invention. Pendulum damper, the damper plate 1 which is formed in an annular shape, equally spaced in a circular circumferential direction of the damper plate 1, and a holding chamber 2 of the long eight in the circumferential direction of the damper plate 1, rolling The inner peripheral surface 3 of the chamber 2 includes a rolling element (not shown) that is held so as to be rotatable relative to the rotation of the damper plate 1. In the center of the damper plate 1, a through hole 4 through which a rotating shaft (not shown) is inserted is formed. Further, the rotating shaft inserted through the through hole 4 is engaged with the damper plate 1 so as to be integrally rotatable. That is, the damper plate 1 is configured to receive torque from the rotation shaft and rotate around the center of the through hole 4 as the rotation center. The pendulum damper is, for example, an internal part of a torque converter or a power source, for example, between an engine output shaft and an input shaft such as a transmission, or in a hybrid vehicle, between an engine output shaft and a motor / generator rotation shaft. Between.

  As shown in FIG. 1, the rolling chamber 2 is formed at a location deviated from the rotation center of the damper plate 1. The rolling chamber 2 is formed long in the rotational direction of the damper plate 1, that is, in the circumferential direction. Further, as shown in FIG. 2, the rolling chamber 2 is formed such that the first inner peripheral surface 5 on the radially outer side of the inner peripheral surface 3 is longer in the circumferential direction than the second inner peripheral surface 6 on the radially inner side. Has been. As shown in FIG. 2, the second inner peripheral surface 6 includes a protruding portion 7 in which the vicinity of the center in the circumferential direction protrudes outward in the radial direction. The protrusion 7 is formed in order to suppress the occurrence of rattling in the radial direction between the rolling element and the inner peripheral surfaces 5 and 6 when the rolling element accommodated in the rolling chamber 2 rolls. Has been.

The first inner peripheral surface 5 according to the embodiment of the present invention includes a rolling surface 9 that is a surface on which the rolling element rolls and that has a shape that is a curved surface along a cycloid curve. As shown in FIG. 3, the rolling surface 9 is formed by a cutting tool such as an end mill 10. Further, on both ends of the rolling sliding surface 9 in the circumferential direction of the damper plate 1, in concrete terms, the outer side of the start site 11 and end portion 12 of the rolling sliding surface 9 in the circumferential direction of the damper plate 1 Are respectively formed with arc-shaped notches 13 and 14 penetrating in the axial direction of the damper plate 1.

Each notch 13, 14 is constituted by a first notch 13 on the start site 11 side of the rolling surface 9 and a second notch 14 on the end site 12 side of the rolling surface 9. Each notch part 13 and 14 is formed in the position which touches or overlaps the start part 11 or the end part 12 of the rolling surface 9. Each notch 13 and 14 has a so-called R-shape, and is formed with a radius by Ri large radius of curvature of the end mill 10 (inner diameter larger than the outer diameter of the end mill 10). In other words, the notches 13 and 14 are formed so that the end mill 10 can be inserted and the end mill 10 can contact the start portion 11 of the rolling surface 9. When the damper plate 1 vibrates in the rotational direction, the pendulum damper configured as described above is driven by the inertial force of the rolling element that rotates relative to the damper plate 1 while rolling on the rolling surface 9. The generated torsional vibration can be suppressed.

Next, a method for forming the rolling surface 9 of the rolling chamber 2 in the damper plate 1 of the pendulum damper so as to be a curved surface along the cycloid curve will be described. First, the position where the rolling Doshitsu 2 in the annular member is a damper plate 1, holes are drilled by pressing. As shown in FIG. 1, in this embodiment, since the rolling chamber 2 is provided in eight places, said hole is also provided in the corresponding eight places, respectively. The through-hole 4 may be provided in advance as described above, or may be formed by making a hole in the center of the damper plate 1 by press work, as with the rolling chamber 2.

After the hole is formed in the damper plate 1, the notches 13 and 14 are formed. As described above, the notches 13 and 14 are formed with a radius of curvature larger than the radius of the end mill 10 used when the rolling surface 9 is formed to be a curved surface along a cycloid curve . The cutting tool of their, as shown in FIG. 3, the first notch 13 is formed so as to reach the start site 11 of the rolling contact surface 9, or in contact. Although not shown, the second notch 14 is also formed so as to contact the end portion 12 of the rolling surface 9. In other words, the notches 13 and 14 are formed so as to cut a portion adjacent to the start portion 11 or the end portion 12 of the rolling surface 9 in the circumferential direction. Thus, each notch 13 and 14 is the outer side in the circumferential direction of the start part 11 and the end part 12 of the rolling surface 9, and is in contact with the start part 11 and the end part 12 of the rolling surface 9. Alternatively, it is formed to have an intersection.

  If each notch part 13 and 14 is formed as mentioned above, it will form so that the rolling surface 9 of the 1st internal peripheral surface 5 may become a curved surface along a cycloid curve. The rolling surface 9 is a boundary portion between one notch portion 13 and the rolling surface 9, and sends the end mill 10 along a cycloid curve from a start portion 11 that is a starting end of cutting toward an end portion 12. It is cut and formed.

  In the embodiment of the present invention, since the notches 13 and 14 are formed, when the rolling surface 9 is formed to have a cycloid curve, first, the end mill 10 is inserted through the first notch 13. . Then, the end mill 10 is sent from the first cutout portion 13 to the end portion 12, that is, the second cutout portion 14 so as to be a trajectory of the cycloid curve. That is, the rolling surface 9 is formed by passing the end mill 10 through the first notch 13 and then feeding the end mill 10 in the circumferential direction of the damper plate 1, that is, cutting with the end mill 10. Therefore, the area that the end mill 10 comes into contact with when the start portion 11 starts cutting is only the region 15 adjacent to the first notch 13 of the start portion 11 in the circumferential direction. That is, since each notch part 13 and 14 is formed as mentioned above, the end mill 10 contacts the part processed as the rolling surface 9, and does not contact the part adjacent to the said part. When the rolling surface 9 is formed in this manner, the manufacture of the pendulum damper is completed by attaching the rolling elements to the rolling chamber 2. Although not shown, the rolling element is held in the rolling chamber 2 by attaching a cover attached from the outside of the damper plate 1 or a rolling element having an H-shaped cross section.

According to this structure, the notch parts 13 and 14 are formed in the start site | part 11 and the end site | part 12 of the rolling surface 9 among the 1st internal peripheral surfaces 5, respectively. Moreover, each notch part 13 and 14 is formed with the curvature radius larger than the radius of the end mill 10 for forming the rolling surface 9. Therefore, as described above, when cutting so that the rolling surface 9 has a cycloid curve, the end mill 10 is inserted into the first notch 13 and the end mill 10 is inserted from the first notch 13 to the second notch. It is processed into a curved surface along the cycloid curve by moving while cutting in the circumferential direction toward 14. Since the notch portions 13 and 14 that are so-called escape portions are formed at the start portion 11 and the end portion 12 of the cutting process, the end mill 10 contacts the portion to be processed as the rolling surface 9. , Do not touch the part adjacent to the part. Such a cutting state is the same as the state of cutting the intermediate portion of the rolling surface 9, and therefore the load or cutting resistance applied to the end mill 10 is substantially the same over the entire rolling surface 9. As a result, the state of cutting such as the bending of the end mill 10 does not change particularly during the cutting of the rolling surface 9, so that the rolling surface 9 can be processed with high accuracy as designed.

  DESCRIPTION OF SYMBOLS 1 ... Damper plate (rotating body), 2 ... Rolling chamber, 3 ... Inner peripheral surface, 5 ... First inner peripheral surface, 6 ... Second inner peripheral surface, 9 ... Rolling surface, 10 ... End mill (cutting tool) 11 ... Start part (boundary part), 12 ... End part, 13 ... First notch part, 14 ... Second notch part.

Claims (2)

At a position deviated from the rotation center of the rotating body that rotates under torque, the long holding chamber in the circumferential direction of the rotary body is formed, Chi sac inner circumferential surface of the holding chamber, the radius of the rotary body formed on the rolling surface of the rolling elements swung in response to the vibration of the torque by switching cutting with a cutting tool such that the curved surface of the outer inner peripheral surface along a cycloid which is located outside in the direction, the In the method of manufacturing a vibration reducing device manufactured by attaching a rolling element to the rolling chamber ,
Prior to cutting the outer peripheral surface with the cutting tool,
Wherein a radius of curvature greater than the radius of the cutting tool to each of both end portions in the front Kisotogawa peripheral surface of the circular circumferential direction, and said the imaginary line extending the rolling surface in the circumferential direction Form a notch to include the outer part in the radial direction ,
Then, the cutting tool is inserted into notch of either one of the previous SL notch,
The one notch and the front Kitendo surface intersection at which boundary portion of the cutting tool the circumferential direction by the one notch before Symbol notch sac Chino other from section as a cutting start end of the send the notch of the rectangular method for manufacturing a vibration damping system, characterized that you form the rolling surface by switching cutting the outer inside circumference.   In the manufacturing method of the torsional vibration reduction device according to claim 1,
  A method for manufacturing a vibration reducing device, wherein a width between the outer peripheral surface and the rolling surface in the radial direction is smaller than a radius of the cutting tool.

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