JP6822256B2 - Torsional vibration reduction device - Google Patents

Description

The present invention relates to a torsional vibration reducing device configured to reduce torsional vibration caused by fluctuation (vibration) of an input torque, and in particular, a device for reducing torsional vibration by reciprocating motion or pendulum motion of an inertial mass body. It is about.

This type of device is described in Patent Document 1. The device includes a rotating member that receives torsional vibration, a plurality of accommodating chambers that are formed at regular intervals in the circumferential direction of the rotating member and that penetrate in the plate thickness direction of the rotating member, and each accommodating chamber. It is provided with a disk-shaped or columnar inertial mass body having a short axial length arranged in each of the above. A rolling surface is formed on the outer inner wall portion of the rotating member in the radial direction. When the rotating member rotates, the inertial mass is pressed against the rolling surface by centrifugal force. When the torque input to the rotating member fluctuates while the inertial mass is pressed against the rolling surface due to centrifugal force, the inertial mass reciprocates in the circumferential direction along the rolling surface to generate inertial torque. , It is configured to reduce torsional vibration by its inertial torque.

Japanese Unexamined Patent Publication No. 2012-145190

In a device in which a rolling element is placed in a containment chamber and vibration is reduced by reciprocating movement of the rolling element, the rolling element is configured to be able to move freely inside the containing chamber. Therefore, in the device described in Patent Document 1, if the centrifugal force is not sufficiently large, the rolling element may fall to the lowermost part inside each storage chamber or move freely in the rolling chamber due to gravity. To do. Further, in the configuration described in Patent Document 1, since a plurality of accommodation chambers are independent of each other, if the inertial mass body falls in each accommodation chamber or moves freely in the accommodation chamber, the inner wall surface of the accommodation chamber Inertial masses collide with each other, or collision noise is generated.

The present invention has been made by paying attention to the above technical problems, and provides a torsional vibration reducing device capable of preventing or suppressing a rolling element from colliding with the inner surface of a guide hole to generate an abnormal noise. Is the purpose.

In the present invention, in order to achieve the above object, a plurality of guide holes are formed at predetermined intervals in the circumferential direction of the rotating body, and the circumference of the rotating body is caused by the torque fluctuation input to the rotating body. Rolling bodies that reciprocate in the direction are arranged in each of the guide holes, and the rolling elements are pressed against the outer inner wall surface of the inner wall surface of the guide hole in the radial direction of the rotating body by centrifugal force, and the torque fluctuates. In a torsional vibration reducing device in which the inner wall surfaces of the guide holes are reciprocated by, and the inner wall surfaces on both sides in the circumferential direction of the rotating body are side wall surfaces, in the radial direction of the rotating body. A retainer which is arranged concentrically with the rotating body inside the rolling body and regulates the position of the rolling body with respect to the rotation center of the rotating body is provided, and the rolling surface and the rolling surface and the said in the circumferential direction of the rotating body. The rolling element is displaced inward in the radial direction of the rotating body from the tangent lines at both ends of the rolling surface in the circumferential direction of the rotating body in each of the side wall surfaces, and the rolling element is displaced to the retainer. and displacement unit is formed which restrains sandwiching the rolling elements between said retainer by Rukoto contacting and being restrained by the rolling element is clamped between the retainer and the displacement portion In this state, a gap is formed between the side wall surface following the displacement portion to which the rolling element is in contact and the rolling element, and the displacement portion moves along the displacement portion. The amount of displacement in the radial direction per unit length or unit movement distance of the rolling element is the amount of displacement in the radial direction per unit length or movement distance of the rolling element moving along the rolling surface. It is characterized in that it is formed so as to be larger .
In the present invention, the displacement portion may be an arc surface having a radius of curvature smaller than the radius of curvature of the rolling surface, which is located inside the tangent line in the radial direction.
In the present invention, the displacement portion may be an inclined surface which is located inside the tangent line in the radial direction and is formed so as to extend from both ends of the rolling surface toward the rotation center side of the rotating body.
In the present invention, the displacement portion may be a step that is located inside the tangent line in the radial direction and is formed so as to project inward in the radial direction from both ends of the rolling surface.

According to the present invention, the rolling element rotates with the rotation of the rotating body, and is pressed by centrifugal force against the rolling surface which is the outer inner wall surface of the inner wall surface of the guide hole in the radial direction of the rotating body. When the torque input to the rotating body fluctuates, the rolling element reciprocates along the rolling surface according to the torque fluctuation. When the rotation speed of the rotating body becomes low and the centrifugal force becomes small, or the amplitude of the rolling body becomes large due to a large fluctuation of torque, the rolling body moves to the displacement part following the rolling surface and the displacement part. Move along. The displacement portion is configured to displace the rolling element inward in the radial direction of the rotating body from the tangents at both ends of the rolling surface. Therefore, in the displacement portion, the rolling element is located inside in the radial direction of the rotating body from the tangents at both ends of the rolling surface. Further, the retainers are arranged concentrically with the rotating body inside the rolling body in the radial direction of the rotating body, and the position of the rolling body with respect to the rotation center of the rotating body is regulated by the retainer. Therefore, when the rolling element moves in the displacement portion and the distance between the rotation center of the rotating body and the rolling element is gradually shortened, the rolling element comes into contact with the displacement portion and the retainer. Further, in the state where the rolling element is in contact with the displacement portion and the retainer in this way, a gap is formed between the rolling element and the side wall surface following the displacement portion in which the rolling element is in contact. Therefore, the collision between the rolling element and the side wall surface of the guide hole is suppressed. As a result, even when the rotating body is rotating at a rotation speed that does not generate a centrifugal force enough to press the rolling body against the rolling surface, it is possible to prevent or suppress free movement of the rolling body in the radial direction. it can. Further, it is possible to prevent or suppress that the rolling element collides with the side wall surface of the guide hole and that the collision sound is generated due to the collision.

It is a figure which shows typically an example of the torsional vibration reduction apparatus which concerns on 1st Embodiment of this invention. It is a schematic diagram which shows enlarged part of the torsional vibration reduction apparatus which concerns on 1st Embodiment of this invention. It is a schematic diagram which shows enlarged part of the torsional vibration reduction apparatus which concerns on 2nd Embodiment of this invention. It is a schematic diagram which shows enlarged part of the torsional vibration reduction apparatus which concerns on 3rd Embodiment of this invention.

(First Embodiment)
Next, the present invention will be described based on the embodiments. The torsional vibration reducing device according to the first embodiment of the present invention is provided in a torque transmission path between a driving force source (not shown) and a driving target portion (not shown), and the torque transmitted from the driving force source to the driving target portion is provided. It is configured to reduce fluctuations in. The driving force source is, for example, an engine, and therefore the output torque of the engine inevitably fluctuates (vibrates). The drive target unit is, for example, a transmission, which is a conventionally known transmission such as a stepped transmission in which the gear ratio changes stepwise, or a continuously variable transmission in which the gear ratio changes continuously. You can.

FIG. 1 is a diagram schematically showing an example of a torsional vibration reducing device according to the first embodiment of the present invention, and FIG. 2 is an enlarged part of the torsional vibration reducing apparatus according to the first embodiment of the present invention. It is a schematic diagram which shows. The rotating body 1 is attached to a rotating shaft such as an engine crankshaft or a transmission input shaft (not shown) so as to be coaxial with the rotation center axis thereof. The rotating body 1 is a disk-shaped member made of metal, and penetrates the rotating body 1 in the plate thickness direction at a position deviated in the radial direction from the rotation center 1A of the rotating body 1, that is, on the circumference of a predetermined radius. A plurality of guide holes 2 are formed side by side in the circumferential direction of the rotating body 1. In the example shown in FIG. 1, four guide holes 2 are formed. A rolling element 3 which is an inertial mass body is arranged in each guide hole 2. Each guide hole 2 is formed in an appropriate shape and size so that the rolling element 3 arranged inside the guide hole 2 can reciprocate within a predetermined range. In the examples shown in FIGS. 1 and 2, the guide hole 2 is formed in a fan shape.

The guide holes 2 are all formed in the same shape. Of the inner wall surface of the guide hole 2, the outer inner wall surface in the radial direction of the rotating body 1 is a rolling surface 4 on which the rolling element 3 is pressed by centrifugal force and the rolling element 3 is reciprocated by torque fluctuation. ing. In other words, the rolling surface 4 is formed in a range in which the rolling element 3 reciprocates due to torque fluctuation. The shape of the rolling surface 4 is an arc surface having a radius of curvature smaller than the radius of the rotating body 1 or a curved surface similar to the arc surface. Therefore, the central portion of the rolling surface 4 in the longitudinal direction is the farthest from the rotation center 1A of the rotating body 1, and this is the neutral point P0. The rolling element 3 gradually approaches the rotation center 1A of the rotating body 1 so as to shift from the neutral point P0 toward both ends of the rolling surface 4. The angle range in which the rolling surface 4 reciprocates in response to torque fluctuations can be obtained in advance by experiments or the like. The swing angle of the rolling element 3 from the neutral point P0 is shown by reference numeral θ1 in FIG. Further, in the examples shown in FIGS. 1 and 2, the rolling element 3 is located at the neutral point P0.

The inner wall surfaces of the rotating body 1 that are continuous on both sides of the rolling surface 4 in the circumferential direction are bending surfaces 5 that correspond to the displacement portions in the embodiment of the present invention. In FIG. 2, the tangents at both ends of the rolling surface 4 are indicated by reference numerals 4A, and the bent surface 5 rolls inward in the radial direction of the rotating body 1 from the tangents 4A at both ends of the rolling surface 4. It is an inclined surface extending from both ends of the moving surface 4 toward the center of rotation 1A. Further, the unit length of the rolling element 3 moving along the bending surface 5 or the amount of displacement of the rotating body 1 in the radial direction per unit moving distance is the unit length of the rolling element 3 moving along the rolling surface 4. Alternatively, the bent surface 5 is configured so as to be larger than the amount of displacement of the rotating body 1 in the radial direction per moving distance. Therefore, when the rolling element 3 moves from the rolling surface 4 to the bending surface 5 and moves along the bending surface 5, the rotation center 1A of the rotating body 1 is not located at both ends of the rolling surface 4. The rolling element 3 comes closer to the side. Further, the inner wall surface on both sides of the guide hole 2 in the circumferential direction of the rotating body 1 and continuing to the bent surface 5 is the side wall surface 6, and the rolling element 3 is limited to the side wall surface 6. Or, it is configured to roll in the circumferential direction of the rotating body 1 between the side wall surfaces 6.

The rolling element 3 is a metal member formed in a circular cross section such as a columnar shape or a disk shape so as to roll along the rolling surface 4. Each rolling element 3 has substantially the same shape and is formed to have the same mass, and the center determined by the shape and the position of the center of gravity coincide with each other. In the example shown here, the rolling element 3 is formed in a columnar shape, and the length in the axial direction is set to be longer than the plate thickness of the rotating body 1. Therefore, both ends of the rolling element 3 project to both sides of the rotating body 1 in the axial direction. The rolling element 3 may be configured so that the cross-sectional shape is "H", with flange portions provided on both sides in the axial direction thereof. With such a configuration, the outer peripheral surface between the flange portions comes into contact with the rolling surface 4, rolls along the rolling surface 4, and the flange portions come into contact with both side surfaces of the rotating body 1. It is possible to prevent the rolling element 3 from coming out of the guide hole 2 in the axial direction of the rotating body 1 because the rolling element 3 is caught in the guide hole 2.

Each rolling element 3 is connected by a connecting member 7 so as to move together in the rotational direction or the circumferential direction of the rotating body 1. The connecting members 7 are arranged on both sides of the rotating body 1 in the axial direction, for example. The connecting member 7 is a member made of synthetic resin including an annular portion 7A and a plurality of arm portions 7B extending outward in the radial direction from the annular portion 7A. The annular portion 7A is inside the rolling element 3 arranged in the guide hole 2 in the radial direction of the rotating body 1 and is arranged concentrically with the rotating body 1 so that the rotating body 1 rolls with respect to the rotation center 1A. The position of the moving body 3 is regulated. That is, there is a predetermined gap between the outer peripheral surface of the annular portion 7A in the radial direction of the rotating body 1 and the outer peripheral surface of the rolling element 3 arranged at the neutral point P0. Therefore, the rolling element 3 moves in the radial direction of the rotating body 1 within the space partitioned by the annular portion 7A of the connecting member 7 and the guide hole 2, and faces inward in the radial direction of the rotating body 1. The rolling element 3 moves up to the annular portion 7A. The length of the gap between the outer peripheral surface of the annular portion 7A in the radial direction of the rotating body 1 and the outer peripheral surface of the rolling element 3 arranged at the neutral point P0 is such that the rolling element 3 moves along the bending surface 5. The displacement amount of the rolling element 3 toward the rotation center 1A side of the rotating body 1 is set to be substantially the same as or shorter than the displacement amount. Therefore, when the rolling element 3 moves along the bent surface 5 and is displaced inward in the radial direction, the outer peripheral surface of the annular portion 7A and the outer peripheral surface of the rolling element 3 come into contact with each other. Further, a predetermined gap C is set between the rolling element 3 and the side wall surface 6 in a state where the outer peripheral surface of the annular portion 7A and the outer peripheral surface of the rolling element 3 are in contact with each other. The above-mentioned annular portion 7A corresponds to the retainer in the embodiment of the present invention.

Two arm portions 7B form a set, and one set of arm portions 7B is formed corresponding to each guide hole 2. The distance between one set of arm portions 7B in the circumferential direction of the rotating body 1 is set to be slightly longer than the outer diameter of the rolling body 3. Therefore, the rolling elements 3 are arranged so as to be loosely fitted between the set of arm portions 7B.

Next, the operation of the above-mentioned torsional vibration reducing device will be described. When the rotating body 1 rotates, each rolling body 3 arranged in the guide hole 2 rotates together with the rotating body 1, and a centrifugal force acts on each rolling body 3. When the centrifugal force of the rolling element 3 becomes larger than the gravity due to the high rotation speed of the rotating body 1, each rolling body 3 moves to the position farthest from the rotation center 1A of the rotating body 1 on the rolling surface 4. Then, it is pressed against the rolling surface 4. Further, since each rolling element 3 is connected by the connecting member 7 so as to move together in the circumferential direction of the rotating body 1, the connecting member 7 rotates together with the rolling element 3.

If the torque input to the rotating body 1 fluctuates in this state, the rotating body 1 vibrates (twisting vibration) in the rotating direction, so that each rolling body 3 undergoes a relative acceleration in the rotating direction, and each rolling body 3 causes. It rolls along the rolling surface 4 due to the inertial force. As described above, the rolling surface 4 has a curved surface having a small radius of curvature, so that the inertial force of the rolling body 3 acts in a direction of suppressing the vibration of the rotating body 1, and the torsional vibration is reduced.

On the other hand, when the centrifugal force acting on the rolling element 3 is smaller than the gravity due to the low rotation speed of the rotating body 1, the rolling element 3 falls toward the lowermost part in the guide hole 2 due to gravity. For example, due to gravity, the rolling element 3 moves to the right side in FIG. 2 along the rolling surface 4, the connecting member 7 rotates accordingly, and the arm portion 7B moves to the right side in FIG. The rolling element 3 moves from the rolling surface 4 to the bending surface 5 and moves along the bending surface 5. Along with this, the rolling element 3 moves inward in the radial direction of the rotating body 1, so that the position of the rolling element 3 in the radial direction of the rotating body 1 is higher than that of the rotating body 1 located at the end of the rolling surface 4. It becomes the rotation center 1A side of. As the rolling element 3 moves on the bent surface 5 toward the side wall surface 6, the position of the rolling element 3 in the radial direction of the rotating body 1 becomes the rotation center 1A side of the rotating body 1. Finally, the outer peripheral surface of the rolling element 3 and the outer peripheral surface of the annular portion 7A come into contact with or engage with each other. In this state, as shown in FIG. 2, there is a gap C between the outer peripheral surface and the side wall surface 6 of the rolling element 3.

Therefore, according to the device having the above configuration, since the bending surfaces 5 that displace the rolling elements 3 toward the rotation center 1A side of the rotating body 1 are formed on both sides of the rolling surface 4, the rotating body 1 has a low rotation speed. When the amplitude of the rolling element 3 becomes large and moves on the bent surface 5 due to a large torque fluctuation or the like, the rolling element 3 comes into contact with the annular portion 7A, and the annular portion 7A It is sandwiched and restrained between the outer peripheral surface and the bent surface 5. Further, in this state, since there is a gap C between the rolling element 3 and the side wall surface 6, it is possible to avoid or suppress the collision of the rolling element 3 with the side wall surface 6. That is, it is possible to prevent or suppress the occurrence of abnormal noise and vibration accompanying the collision of the rolling element 3 with the side wall surface 6.

Here, when the annular portion 7A and the rolling element 3 repeatedly contact each other using the connecting member 7 for a long period of time, the contact portion of the annular portion 7A with the rolling element 3 is deformed or worn. The case where the thickness of the annular portion 7A in the radial direction becomes thin will be described. Even in such a case, since the bending surface 5 having the above configuration is provided, when the rolling element 3 moves on the bending surface 5, the rolling element 3 is displaced or moved inward in the radial direction of the rotating body 1. Then, the outer peripheral surface of the rolling element 3 and the outer peripheral surface of the annular portion 7A come into contact with or engage with each other before the rolling element 3 and the side wall surface 6 come into contact with each other. Since the rolling element 3 is sandwiched and restrained between the annular portion 7A and the bent surface 5, it is possible to prevent or suppress the generation of abnormal noise and the vibration accompanying the collision of the rolling element 3 with the side wall surface 6. Can be done.

(Second Embodiment)
FIG. 3 is an enlarged view showing a part of the torsional vibration reducing device according to the second embodiment of the present invention. The example shown here is an example in which an arc surface 8 having a radius of curvature shorter than that of the rolling surface 4 is formed instead of the bent surface 5 which is an inclined surface. Therefore, the unit length of the rolling element 3 moving along the arcuate surface 8 or the amount of displacement of the rotating body 1 in the radial direction per moving distance is the unit length of the rolling element 3 moving along the rolling surface 4. Alternatively, it is larger than the amount of displacement of the rotating body 1 in the radial direction per unit moving distance. Since other configurations are the same as the configurations shown in FIGS. 1 and 2, the same parts as those shown in FIGS. 1 and 2 are designated by the same reference numerals as those in FIGS. 1 and 2, and the description thereof will be omitted. .. In the second embodiment, the arcuate surface 8 corresponds to the displacement portion in the embodiment of the present invention.

Also in the example shown in FIG. 3, when a sufficiently large centrifugal force acts on each rolling element 3 due to the high rotation speed of the rotating body 1, each rolling element 3 is pressed against the rolling surface 4 and each rolling due to torque fluctuation. The moving body 3 reciprocates along the rolling surface 4. Since each rolling element 3 is connected by a connecting member 7 so as to move together in the rotational direction, each rolling element 3 reciprocates (swings) together. On the other hand, if the centrifugal force acting on the rolling element 3 is small due to the low rotation speed of the rotating body 1, each rolling element 3 falls toward the lowermost part of the guide hole 2 due to gravity. For example, when the rolling element 3 moves to the right side in FIG. 3 along the rolling surface 4 and moves from the rolling surface 4 to the arc surface 8, the radius of curvature of the arc surface 8 is shorter than the radius of curvature of the rolling surface 4. Therefore, the rolling element 3 is displaced inward in the radial direction of the rotating body 1, that is, moved, and the annular portion 7A and the rolling element 3 come into contact with or engage with each other. Further, since there is a gap C between the rolling element 3 and the side wall surface 6, the rolling element 3 violently collides with the side wall surface 6 even when the rotation speed of the rotating body 1 is low, and the collision sound accompanying the collision sound. It is possible to surely prevent or suppress a situation such as the occurrence of.

(Third Embodiment)
FIG. 4 is an enlarged view showing a part of the torsional vibration reducing device according to the third embodiment of the present invention. In the example shown here, instead of the bent surface 5 and the arc surface 8, at least one step 9 following the rolling surface 4 is formed inward in the radial direction of the rotating body 1 from the tangents 4A at both ends of the rolling surface 4. This is an example of formation. The rolling element 3 moves inward in the radial direction of the rotating body 1 by climbing on the step 9. This step 9 corresponds to the displacement portion in the embodiment of the present invention. Since other configurations are the same as those shown in FIGS. 1 to 3, the same parts as those shown in FIGS. 1 to 3 are designated by the same reference numerals as those in FIGS. 1 to 3 and the description thereof will be omitted. ..

Also in the example shown in FIG. 4, when a sufficiently large centrifugal force acts on each rolling element 3 due to the high rotation speed of the rotating body 1, each rolling element 3 is pressed against the rolling surface 4 and each rolling due to torque fluctuation. The moving body 3 reciprocates along the rolling surface 4. Since each rolling element 3 is connected by a connecting member 7 so as to move together in the rotational direction, each rolling element 3 reciprocates (swings) together. On the other hand, if the centrifugal force acting on the rolling element 3 is small due to the low rotation speed of the rotating body 1, each rolling element 3 falls toward the lowermost part of the guide hole 2 due to gravity. For example, when the rolling element 3 moves to the right side in FIG. 4 along the rolling surface 4 and rides on the step 9, the rolling element 3 moves inward in the radial direction of the rotating body 1 by the height of the step 9. Moving. Then, the annular portion 7A and the rolling element 3 come into contact with or engage with each other. Further, since there is a gap C between the rolling element 3 and the side wall surface 6, the rolling element 3 violently collides with the side wall surface 6 even when the rotation speed of the rotating body 1 is low, and the collision sound accompanying the collision sound. It is possible to surely prevent or suppress a situation such as the occurrence of.

The present invention is not limited to each of the above-described embodiments, and the rolling element in the present invention is not limited to a columnar shape or a disk shape, and may have a cross-sectional shape of "H". .. In addition, the torsional vibration reducing device according to the present invention may be appropriately configured without departing from the present invention.

1 ... Rotating body, 1A ... Center of rotation of rotating body, 2 ... Guide hole, 3 ... Rolling body, 4 ... Rolling surface, 4A ... Tangent lines at both ends of rolling surface, 5 ... Bending surface (displacement part), 6 ... Side wall surface, 7A ... Circular portion (retainer) of connecting member, 8 ... Arc surface (displacement portion), 9 ... Step (displacement portion), C ... Gap.

Claims (4)

A plurality of guide holes are formed at predetermined intervals in the circumferential direction of the rotating body, and the rolling elements that reciprocate in the circumferential direction of the rotating body due to the torque fluctuation input to the rotating body are each of the guide holes. Of the inner wall surface of the guide hole, the outer inner wall surface in the radial direction of the rotating body is a rolling surface on which the rolling element is pressed by centrifugal force and reciprocates due to the torque fluctuation. In the torsional vibration reduction device in which the inner wall surfaces on both sides of the inner wall surface of the rotating body are the side wall surfaces in the circumferential direction of the rotating body.
A retainer that is arranged concentrically with the rotating body inside the rolling body in the radial direction of the rotating body and regulates the position of the rolling body with respect to the rotation center of the rotating body is provided.
Inside each of the rolling surface and the side wall surface in the circumferential direction of the rotating body in the radial direction of the rotating body from the tangents at both ends of the rolling surface in the circumferential direction of the rotating body. wherein and displacement unit is formed which restrains sandwiching the rolling elements between said retainer by Rukoto the rolling element to displace contacting the rolling elements to the retainer,
In a state where the rolling element is sandwiched and restrained between the displacement portion and the retainer , between the side wall surface following the displacement portion with which the rolling element is in contact and the rolling element. a gap is formed,
In the displacement portion, the unit length of the rolling element moving along the displacement portion or the displacement amount in the radial direction per unit moving distance is the unit length of the rolling element moving along the rolling surface. A torsional vibration reducing device characterized in that it is formed so as to be larger than the amount of displacement in the radial direction per moving distance . In the torsional vibration reducing device according to claim 1,
The displacement portion is a torsional vibration that is located inside the tangent line in the radial direction and is formed so as to extend from both ends of the rolling surface toward the rotation center side of the rotating body. Reduction device. In the torsional vibration reducing device according to claim 1,
A torsional vibration reducing device characterized in that the displacement portion is located inside the tangent line in the radial direction and is an arc surface having a radius of curvature smaller than the radius of curvature of the rolling surface. In the torsional vibration reducing device according to claim 1,
The displacement portion is a step that is located inside the tangent line in the radial direction and is formed so as to project inward in the radial direction from both ends of the rolling surface. ..

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