JP2017150555A - Torsional vibration reduction device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a torsional vibration reduction device which can reduce a thrust force acting on each rotating element of a planetary roller mechanism.SOLUTION: In a torsional vibration reduction device which comprises a planetary gear mechanism 1, and in which a pinion roller 3 revolves together with a carrier C within an angle range corresponding to a vibration amplitude of torque when the torque inputted to one of a sun roller 2, a ring relay 11 and the carrier C is varied, the pinion roller 3 has an inclined face 3a which becomes narrow toward the other side from one side in an axial line direction, and in the inclined face 3b, an inclination direction with respect to a rotating axial line of at least one first pinion roller 3b out of a plurality of the pinion rollers, and an inclination direction with respect to a rotating axial line of the other second pinion roller 4b are set reverse with respect to each other.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a torsional vibration reducing device including a planetary roller mechanism configured to reduce torsional vibration caused by input torque fluctuation (vibration) by inertial force generated by the fluctuation.

  Patent Document 1 discloses a planetary roller mechanism for suppressing an increase in the size of a planetary roller mechanism and suppressing a change in the sum of the magnitudes of pressing forces acting between a ring roller and a pinion roller. Is described. The planetary roller mechanism described in Patent Document 1 includes a sun roller, a ring roller, and a plurality of pinion rollers in contact with the sun roller and the ring roller. The sun roller is used as an input element for receiving power, and the pinion roller is used as an output element for outputting power to transmit power. And the part which said pinion roller and ring roller contact is made into the taper surface which expands toward the other side from the one side of an axial direction. In Patent Document 2, a damper device incorporating a planetary gear mechanism is described.

JP 2011-12722 A JP 2014-177960 A

  In order to attenuate torsional vibration caused by the excitation force of an engine or the like, for example, the planetary roller mechanism described in Patent Document 1 is incorporated in the damper device described in Patent Document 2 to attenuate the vibration. Can do. However, in the planetary roller mechanism configured as described above, each pinion roller is inclined with respect to the axial direction, that is, a tapered surface. Therefore, a thrust force acts on the sun roller and the ring roller when torque is transmitted. When such thrust force acts, the sun roller and the carrier or the ring roller and the carrier come into contact with each other, and a sliding resistance corresponding to the thrust force is generated on the contact surface, and as a result, it can swing as expected. Otherwise, the damping effect may be reduced.

  The present invention has been made paying attention to the above technical problem, and an object thereof is to provide a torsional vibration reducing device capable of reducing the thrust force acting on each rotating element of the planetary roller mechanism. It is.

  To achieve the above object, the present invention is a sun roller, a ring roller disposed concentrically with the sun roller, and disposed between an outer peripheral side of the sun roller and an inner peripheral side of the ring roller, and A plurality of pinion rollers arranged at predetermined intervals in a circumferential direction of the sun roller or the ring roller, and a carrier for holding the plurality of pinion rollers so as to rotate and revolve, and an outer periphery of the pinion roller The surface includes a planetary roller mechanism configured to transmit torque by contacting at least one of the outer peripheral surface of the sun roller and the inner peripheral surface of the ring roller, and the sun roller, the ring roller, and the carrier. When the torque input to any of the pins fluctuates, the pinio is within an angle range corresponding to the vibration width of the torque. In the torsional vibration reduction device in which a roller revolves together with the carrier, the pinion roller has an inclined surface that tapers from one side in the axial direction toward the other side, and the inclined surface is at least one of the plurality of pinion rollers. An inclination direction with respect to the rotation axis of one first pinion roller and an inclination direction with respect to the rotation axis of another second pinion roller are formed in opposite directions.

  According to this invention, each rotating element of the planetary roller mechanism is constituted by a rotating element having an inclined surface from one side in the axial direction toward the other side. Among the rotating elements constituting the planetary roller mechanism, a plurality of pinion rollers arranged between the outer peripheral surface of the sun roller and the inner peripheral surface of the ring roller are inclined surfaces between the first pinion roller and the second pinion roller. Are formed in the opposite direction. That is, the inclined surface is formed so that the inclination direction with respect to the rotation axis of the first pinion roller is opposite to the inclination direction with respect to the rotation axis of the other second pinion roller. Therefore, when torque is input to the planetary roller mechanism, for example, the direction of the thrust force acting on the contact portion between the first pinion roller and the ring roller and the thrust acting on the contact portion between the second pinion roller and the ring roller The direction of the force acts in the opposite direction. That is, these thrust forces are diminished from each other in the entire planetary roller mechanism. Therefore, since the thrust force acting on the pinion roller, the ring roller, etc. can be reduced, the sliding resistance corresponding to the thrust force on the contact surface can also be reduced.

It is a figure for demonstrating the planetary roller mechanism in embodiment of this invention. It is sectional drawing which follows the II-II line of the planetary roller mechanism of FIG. It is a figure explaining the shape of the pinion roller which comprises the planetary roller mechanism made into object by this invention, (a) is a figure which shows the example in which the shape of the pinion roller was formed in the taper shape (conical shape), b) is a diagram illustrating an example in which the shape of the pinion roller is formed in a curved shape.

  Next, the planetary roller mechanism 1 according to the embodiment of the present invention will be described with reference to the drawings. The planetary roller mechanism 1 in the embodiment of the present invention is provided, for example, between an output shaft of an engine and an input shaft of a transmission, and is used to reduce torsional vibrations caused by fluctuations in torque output from the engine. As will be described later, the planetary roller mechanism 1 is a roller mechanism that performs a differential action on three rotating elements. An engine output torque is input to one of the rotating elements, and any other rotating element is connected to the transmission. A buffer mechanism is provided that is connected to the input shaft and generates a relative rotation by a torque fluctuation of a spring damper or the like between a rotating element that receives engine output torque and one of the other two rotating elements. When the relative rotation occurs due to such torque fluctuations, relative rotation occurs between the rotating elements due to the differential action of the planetary roller mechanism 1, and as a result, the reaction torque having a phase different from the vibration of the input torque. Is generated according to inertia, and torsional vibration is suppressed. Therefore, the relative rotation of the rotating elements generated in the planetary roller mechanism 1 remains within the range of the rotation angle corresponding to the width of fluctuation of the input torque, that is, the amplitude.

  The planetary roller mechanism 1 used in this way is composed of a roller-type rotating element. Specifically, as shown in FIG. 1, a sun roller 2, pinion rollers 3, 4, 5, 6, a pinion shaft This is a single pinion type planetary roller mechanism 1 constituted by 7, 8, 9, 10 and a ring roller 11. Further, the four pinion rollers 3, 4, 5, and 6 are attached to the first pinion roller 3 to the fourth pinion roller 6 so as to be in contact with both the sun roller 2 and the ring roller 11. Further, the four pinion shafts 7, 8, 9, 10 are attached to the first pinion shaft 7 to the fourth pinion shaft 10 that support the first pinion roller 3 to the fourth pinion roller 6, respectively. Note that the first pinion roller 3 to the fourth pinion roller 6 will be referred to as the pinion roller 3 unless otherwise specified in the following description.

  More specifically, the ring roller 11 is disposed concentrically with the sun roller 2 on the outer peripheral side of the sun roller 2. Further, the pinion rollers of the first pinion roller 3 to the fourth pinion roller 6 are arranged at predetermined intervals in the circumferential direction around the rotation shaft 12 of the sun roller 2. In addition, in the example shown in FIG.

  The pinion roller 3 is configured to circumscribe the sun roller 2 and to be inscribed to the ring roller 11. That is, the pinion roller 3 is sandwiched between the sun roller 2 whose outer peripheral surface 2a is a rolling surface and the ring roller 3 whose inner peripheral surface 11a is a rolling surface, and the pinion roller is held by the carrier C. ing. The carrier C is supported so as to be rotatable coaxially with the sun roller 2. Accordingly, the pinion roller 3 rotates and revolves around the rotation shaft 12 of the sun roller 2 while being held by the carrier C. In addition, the above “inscribed” and “outside” mean a state in which an oil film is interposed so that rotation can be transmitted.

  Each rotating element of the planetary roller mechanism 1 has a truncated cone shape in which one end in the axial direction is tapered. That is, it is formed to taper from one side in the axial direction toward the other side. In other words, the inclined surface is formed to have a tapered shape. Specifically, as described above, a plurality of pinion rollers 3 are arranged at equal intervals between the outer peripheral surface 2a of the sun roller 2 and the inner peripheral surface 11a of the ring roller 11, and the outer periphery 2a of the sun roller 2 and the ring roller 11 are It is in contact with each of the inner peripheral surface 11a. In other words, the pinion roller 3 is supported in a state of being sandwiched by the sun roller 2 and the ring roller 11 in the radial direction. More specifically, the inclined surface 3 b on the outer peripheral surface 3 a of the pinion roller 3 and the inclined surface 2 b on the outer peripheral surface 2 a of the sun roller 2 are in contact with each other. Similarly, the inclined surface 3b on the outer peripheral surface 3a of the pinion roller 3 and the inclined surface 11b on the inner peripheral surface 11a of the ring roller 11 are in contact with each other. Therefore, the outer peripheral surface 3 a of the pinion roller 3 is configured to transmit torque by contacting at least one of the outer peripheral surface 2 a of the sun roller 2 and the inner peripheral surface 11 a of the ring roller 11.

  As described above, the planetary roller mechanism 1 configured in this way is in the normal direction to the contact portion via the oil film of the pinion roller 3 and the ring roller 11 and the pinion roller 3 and the sun roller 2. Torque is transmitted by a shearing force generated by the pressing force at, that is, a traction force in the tangential direction. On the other hand, since each pinion roller 3 has an inclined surface 3b, that is, a tapered surface with respect to the axial direction as described above, a thrust force acts on the sun roller 2 and the ring roller 11 when torque is transmitted. When such a thrust force acts, the sun roller 2 and the carrier C or the ring roller 11 and the carrier C come into contact with each other, and a sliding resistance corresponding to the thrust force is generated on the contact surface. Therefore, the damping effect is reduced. Therefore, in the embodiment of the present invention, the thrust force is configured to be suppressed.

  Specifically, the direction of the inclined surface 3b of the pinion roller 3 is configured so that adjacent pinion rollers are in opposite directions. That is, the inclined surface 3b of the first pinion roller 3 and the inclined surface 4b of the second pinion roller 4 are configured in opposite directions. Similarly, the inclined surface 5b of the third pinion roller 5 and the inclined surface 6b of the fourth pinion roller 6 are configured in opposite directions. That is, in the example shown in FIG. 1, the inclined surfaces are formed so that the first pinion roller 3 and the third pinion roller 5 are oriented in the same direction, and the second pinion roller 4 and the fourth pinion roller 6 are oriented in the same direction. Has been.

  More specifically, in the example shown in FIG. 1, the first pinion roller 3 is formed with an inclined surface 3 b so as to incline toward the front side of the paper, and on the contrary, the second pinion roller 4 is inclined toward the back side of the paper. The inclined surface 4b is formed so as to. In other words, the thrust force described above is configured to act in the opposite direction between the first pinion roller 3 and the second pinion roller 4. Similarly, the third pinion roller 5 is formed with an inclined surface 5b so as to be inclined toward the front side of the sheet, and the fourth pinion roller 6 is formed with an inclined surface 6b so as to be inclined toward the back side of the sheet. That is, the relationship between the third pinion roller 5 and the fourth pinion roller 6 is the same as the relationship between the first pinion roller 3 and the second pinion roller 4. In short, each pinion roller has an inclined surface formed in the opposite direction to the adjacent pinion roller, and the inclined surface is formed in the same direction as the pinion roller disposed on the opposite side across the rotating shaft 12. ing.

  Accordingly, the inclined surface 2b of the sun roller 2 is formed along the direction of the inclined surface 3b of the first pinion roller 3 to the inclined surface 6b of the fourth pinion roller 6. Similarly, the inclined surface 11 b of the ring roller 11 is formed along the direction of the inclined surface 3 b of the first pinion roller 3 to the inclined surface 6 b of the fourth pinion roller 6. That is, the sun roller 2 and the ring roller 11 are formed with the inclined surface 2b (11b) so as to be opposite to the inclined surface of each pinion roller. In the embodiment of the present invention, the inclination angles of the inclined surfaces are equal. For example, the inclination angle of the inclined surface 3b in the first pinion roller 3 and the inclination angle of the inclined surface 11b in the ring roller 11 are equal.

  Each section obtained by equally dividing the planetary roller mechanism 1 into four in the circumferential direction as described above is referred to as a first section 13 to a fourth section 16 in order from the upper side in FIG. In other words, the movable range of the pinion roller 3 is limited at a location where the movable range of the pinion roller 3 is switched, that is, a location where the inclined direction of the inclined surface 2b (11b) of the sun roller 2 and the ring roller 11 is switched. That is, it is configured to prevent each pinion roller 3 from reaching another section.

  Next, a description will be given of a thrust force generated in a portion where the sun roller 2, the pinion roller 3, and the ring roller 11 are in contact with each other when torque is transmitted to the planetary roller mechanism 1. FIG. FIG. 2 is a cross-sectional view taken along the line II-II in FIG. 1 and shows the relationship between the first pinion roller 3 and the second pinion roller 4. Specifically, the first pinion roller 3 and the sun roller 2 are in contact with each other at the inclined surface 3b (2b), and the first pinion roller 3 and the ring roller 11 are in contact with each other at the inclined surface 3b (11b). Similarly, the second pinion roller 4 and the sun roller 2 are in contact with each other at the inclined surface 4b (2b), and the second pinion roller 4 and the ring roller 11 are in contact with each other at the inclined surface 4b (11b).

  As described above, the first pinion roller 3 and the second pinion roller 4 have opposite inclined surfaces, and in the example shown in FIG. 2, the first pinion roller 3 is inclined rightward. The sun roller 2 and the ring roller 11 that are in contact with the first pinion roller 3 are inclined leftward. Therefore, when torque is input, the first pinion roller 3 is pushed rightward in the example shown in FIG. 2 by the thrust force. The sun roller 2 and the ring roller 11 are pushed leftward in the example shown in FIG.

  On the other hand, the second pinion roller 4 is inclined to the left in the example shown in FIG. 2, and the sun roller 2 and the ring roller 11 in contact with the second pinion roller 4 are inclined to the right. Therefore, when torque is input, the second pinion roller 4 is pushed leftward by the thrust force in the example shown in FIG. The sun roller 2 and the ring roller 11 are pushed rightward in the example shown in FIG.

  Therefore, the thrust force acting between the first pinion roller 3 and the sun roller 2 in the first section 13 and the thrust force acting between the second pinion roller 4 and the sun roller 2 in the second section 14 are axial lines. Acts in the opposite direction. Further, the thrust force acting between the first pinion roller 3 and the ring roller 11 in the first section 13 and the thrust force acting between the second pinion roller 4 and the ring roller 11 in the second section 14 are: Acts in the opposite direction in the axial direction. Similarly, the thrust force acting between the third pinion roller 3 and the sun roller 2 in the third section 15, and the thrust force acting between the fourth pinion roller 4 and the sun roller 2 in the fourth section 16, Acts in the opposite direction in the axial direction. The thrust force acting between the third pinion roller 3 and the ring roller 11 in the third section 15 and the thrust force acting between the fourth pinion roller 4 and the ring roller 11 in the fourth section 16 are: Acts in the opposite direction in the axial direction. That is, the thrust force generated by the input of torque is attenuated by the entire planetary roller mechanism 1.

  Therefore, it can be suppressed that the side surfaces of the sun roller 2 and the ring roller 11 are in contact with the carrier C and sliding resistance corresponding to the thrust force is generated on the contact surfaces. Moreover, it becomes possible to improve the vibration damping performance as the sliding resistance is reduced. Further, by using the tapered surface having the inclined surface in this manner, the pressing force acting on the contact portion between the rollers can be distributed in the normal direction and the thrust direction, thereby simplifying the configuration of the planetary roller mechanism 1 as a whole. It becomes possible. Further, since the sun roller 2 and the ring roller 11 are also formed with the inclined surface 2 b (11 b) along the inclined surface 3 b of the pinion roller 3, the first roller 3 is rotated when the pinion roller 3 rotates relative to the ring roller 11. The pinion roller 3 to the fourth pinion roller 6 are prevented from reaching the other sections beyond the first section 13 to the fourth section 16 which are respective movable ranges.

  While the present invention has been described based on the above-described embodiment, the present invention is not limited to the above-described embodiment, and various modifications are made without departing from the spirit of the invention. In the above-described embodiment, an example in which four pinion rollers of the first pinion roller 3 to the fourth pinion roller 6 are provided has been described. However, the number of pinion rollers is not limited to this number and may be plural. Moreover, the inclination direction with respect to the rotation axis of at least one first pinion roller 3 among the plurality of pinion rollers and the inclination direction with respect to the rotation axis of the other second pinion roller 4 may be formed in opposite directions. Further, in the above-described embodiment, the single pinion type planetary roller mechanism has been described as an example, but a double pinion type planetary roller mechanism may be used. In the above-described embodiment, the taper shape having the inclined surface 3b as shown in FIG. 3A has been described as an example. Instead, for example, the curve having the curved surface 3c as shown in FIG. You may comprise by the roller mechanism which consists of a shape.

  DESCRIPTION OF SYMBOLS 1 ... Planetary roller mechanism, 2 ... Sun roller, 2a ... Outer peripheral surface of sun roller, 3, 4, 5, 6 ... Pinion roller, 3a, 4a, 5a, 6a ... Outer peripheral surface of pinion roller, 3b, 4b, 5b, 6b ... Inclined surface of pinion roller, 11 ... Ring roller, 11a ... Inner circumferential surface of ring roller, 11b ... Inclined surface of ring roller, 12 ... Rotating shaft, C ... Carrier.

Claims (1)

A sun roller, a ring roller disposed concentrically with the sun roller, and disposed between an outer peripheral side of the sun roller and an inner peripheral side of the ring roller, and a predetermined direction in a circumferential direction of the sun roller or the ring roller A plurality of pinion rollers arranged at intervals, and a carrier that holds the plurality of pinion rollers so as to rotate and revolve. An outer peripheral surface of the pinion roller is an outer peripheral surface of the sun roller and an inner surface of the ring roller. A planetary roller mechanism configured to transmit torque by contacting at least one surface with the peripheral surface, and when the torque input to any of the sun roller, the ring roller, and the carrier fluctuates, A screw that causes the pinion roller to revolve with the carrier within an angular range corresponding to the vibration width of the torque. In the vibration-reducing device,
The pinion roller has an inclined surface that tapers from one side in the axial direction toward the other side,
The inclined surface is formed such that an inclination direction with respect to the rotation axis of at least one of the plurality of pinion rollers is opposite to an inclination direction with respect to the rotation axis of the other second pinion roller. A torsional vibration reducing device.

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