JPH08121187A - Centrifugal pendulum type vibration damper - Google Patents

Abstract

PURPOSE: To prevent noise from being generated by collision of a roller, and manufacture a vibration damper in a low cost. CONSTITUTION: A vibration damper main body is constituted by a connecting plate 11 and annular plates 12, 13 which are connected to both sides of the connecting plate 11. The recessed guide part of a rolling chamber 16 is constituted by the relief hole 15 of the connecting plate 11 and guide holes 14 of the annular plates 12, 13. The annular projection part 18 of a roller 17 is fit to the recessed guide part of the rolling chamber 16. An annular groove 19 is formed on the top surface of the annular projection part 18, and a rubber ring 20 is fit to the annular groove 19. Torsion vibration in a power transmitting system is reduced by resonance vibration of the roller 17. When the roller 17 is rotated at a setting angle or more, the annular projection part 18 of the roller 17 collides with the wall surface of the relief hole 15 through the rubber ring 20. Shock of collision is released by the rubber ring 20. It is possible to install the rubber ring 20 on the roller 17 by only fitting the rubber ring 20 to the annular groove 19.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a centrifugal pendulum type vibration absorber incorporated into a flywheel or the like of an automobile engine.

[0002]

2. Description of the Related Art An engine for an automobile transmits the energy of an explosion that occurs intermittently to the outside as a driving torque via a crankshaft. For this reason, this type of engine has a problem that the driving torque transmitted to the power transmission system includes a fluctuating torque due to the explosion, and this fluctuating torque easily induces torsional vibration of the power transmission system.

Therefore, as a means for coping with this, a centrifugal pendulum type vibration absorber has been conventionally incorporated in the flywheel portion. This vibration absorber forms a brow-shaped rolling chamber in the vibration absorber body (flywheel body) and accommodates rollers in the rolling chamber. The dynamic vibration absorbing action of this roller absorbs the torsional vibration of the power transmission system. It is supposed to do.

However, in the case of this vibration absorber, the rollers roll smoothly in the rolling chamber during normal drive rotation, but the torque applied to the vibration absorber body changes rapidly when the drive source is started or stopped. Then, it is conceivable that the roller violently collides with the radially inner wall surface of the rolling chamber to generate abnormal noise.

Therefore, as a vibration absorber capable of coping with such a problem, the one disclosed in Japanese Utility Model Publication No. 63-11406 has been conventionally devised.

This centrifugal pendulum type vibration absorber is shown in FIGS.
As shown in FIG. 2, a groove 2 is formed in an annular shape on the side surface of the vibration absorber main body 1, and the rolling guide member 3 is formed on the peripheral wall on the radially outer side of the groove 2.
And the elastic member 4 is attached to the peripheral wall on the radially inner side. A plurality of arc-shaped guide surfaces 5 are formed on the inner peripheral side of the rolling guide member 3 along the circumferential direction, and two guide surfaces 5 are arranged on the outer peripheral side of the elastic member 4 so that two guide surfaces 5 oppose each other. An arcuate stopper surface 6 is formed. Each guide surface 5 and a pair of stopper surfaces 6 and 6 facing the guide surface 5 constitute a cocoon-shaped rolling chamber 7, and each rolling chamber 7 accommodates a roller 8. Then, during normal driving rotation, the rollers 8 resonately roll along the guide surface 5 to absorb the torsional vibration of the power transmission system, and a sudden change in torque occurs when the drive source is started or stopped. In this case, the roller 8 comes into contact with the stopper surface 6 made of the elastic member 4, and the generation of abnormal noise is suppressed.

[0007]

However, in the case of the above-mentioned conventional centrifugal pendulum type vibration absorber, the rolling guide member 3 and the elastic member 4 are mounted in the groove 2 of the flywheel main body 1 to form a pair with the guide surface 5. Since the rolling chamber 7 is constituted by the stopper surfaces 6 and 6, the elastic member 4 has a very complicated shape, and rolling is performed to ensure smooth rolling of the roller 8. The guide member 3 and the elastic member 4 must be attached with extremely high precision, and therefore, the manufacturing cost may increase for these reasons.

Therefore, the present invention is intended to provide a centrifugal pendulum type vibration absorber capable of reliably preventing generation of abnormal noise due to collision of rollers without increasing manufacturing cost.

[0009]

As a means for solving the above-mentioned problems, the invention of claim 1 accommodates a roller forming a centrifugal pendulum in a rolling chamber formed in a vibration absorber main body, and In a centrifugal pendulum type vibration reducer that reduces torsional vibration by resonance rolling, an annular convex portion or an annular concave portion is provided in the outer peripheral area of the roller, and the annular convex portion or the inner peripheral area of the rolling chamber of the vibration absorber main body is formed. A concave guide portion or a convex guide portion fitted with the annular concave portion is provided, and at least one of the top surface of the annular convex portion of the roller and the bottom surface of the concave guide portion of the rolling chamber, or the annular shape of the roller. An annular groove is formed on at least one of the bottom surface of the concave portion and the top surface of the convex guide portion of the rolling chamber, and the elastic member is fitted into the annular groove,
The concave guide portion or the convex guide portion of the vibration absorber body,
The elastic member is formed so as to elastically contact the vibration absorber main body or the roller when the roller rolls over a set angle.

According to a second aspect of the present invention, there is provided a centrifugal pendulum type vibration reducer in which a rolling chamber formed in the vibration absorber main body accommodates a roller serving as a centrifugal pendulum, and torsional vibration is reduced by resonance rolling of the roller. The vibration absorber main body was constructed by joining a plurality of plate materials, and a vibration isolator was interposed between these plate materials.

[0011]

According to the first aspect of the present invention, during normal driving rotation, the roller is guided by the fitting portion of the annular convex portion and the concave guide portion or the annular concave portion and the convex guide portion to roll in the rolling chamber. It moves and absorbs the torsional vibration by the dynamic vibration absorbing action of this roller. When a large torque change occurs at the time of starting or stopping the drive source, which causes the roller to roll over the set angle, the elastic member elastically deforms with the vibration absorber main body or the roller, and at this time, the elastic member cushions noise. Occurrence is suppressed. The elastic member can be easily attached to the roller or the main body of the vibration absorber simply by fitting it in the annular groove, and can be easily removed.

According to the second aspect of the present invention, during normal driving rotation, the torsional vibration is reduced by the resonance rolling of the roller. When the roller rolls by more than the set angle due to the large torque fluctuation, the roller collides with the inner wall surface of the rolling chamber in the radial direction.At this time, the vibration damping material interposed between the plate materials of the vibration absorber body Since the shock is alleviated, the generation of abnormal noise is suppressed. Further, since the vibration isolator is only interposed between the plurality of plate materials, it is extremely easy to attach and detach the vibration isolator body.

[0013]

Embodiments of the present invention will now be described with reference to the drawings. In the following description of a plurality of embodiments, the same reference numerals are used for the same parts, and the description of the overlapping parts will be partially omitted.

First, one embodiment of the invention of claim 1 will be described with reference to FIGS.

In the drawings, reference numeral 10 denotes a centrifugal pendulum vibration absorber according to the present invention. The vibration absorber 10 has a connecting plate 11 having an inner peripheral edge portion coupled to a crankshaft (not shown) of an engine. A vibration absorber main body is constituted by a pair of annular plates 12 and 13 which are joined by rivets on both sides of the outer peripheral edge of the connecting plate 11. Both annular plates 12, 1
The guide holes 14 in the shape of an eyebrow are provided at positions corresponding to each other in 3
Are formed at equal intervals along the circumferential direction, and escape holes 15 that are slightly larger than the guide holes 14 are formed at positions corresponding to the guide holes 14 in the connecting plate 11. . The escape hole 15 and the guide holes 14 of both annular plates 12 and 13 form a concave guide portion of the rolling chamber 16. On the other hand, the rollers 17 accommodated in the rolling chamber 16 are
An annular convex portion 18 is formed substantially at the center in the axial direction. The annular convex portion 18 is housed in the clearance hole 15 between the annular plates 12 and 13, and both end portions of the roller 17 in the axial direction are formed in both sides. It is rotatably supported in each guide hole 14 of the annular plates 12 and 13. That is, the annular convex portion 18 of the roller 17 is rollably fitted to the concave guide portion of the rolling chamber 16 in a state in which axial displacement is restricted. In addition, the escape hole 15 which is the bottom surface of the concave guide portion is not formed to have the same depth from the guide hole 14 in the entire region, but as shown in FIG. 2, the set angle θ at which the roller 17 normally rolls is set. The inner region is formed deep, and the roller 17 is formed shallow in a region where it rolls at a set angle θ or more.

An annular groove 19 having a U-shaped cross section, a V-shaped cross section or a rectangular shape is formed on the top surface of the annular convex portion 18 of the roller 17.
A rubber ring 20 having a circular cross section, which is an elastic member, is fitted into the annular groove 19. When the rubber ring 20 is fitted in the annular groove 19, substantially half of its cross section bulges from the top surface of the annular convex portion 18, and when the roller 17 rolls in the rolling chamber 16 by the set angle θ or more. The bulged portion is elastically contacted with the inner wall surface of the escape hole 15 in the radial direction.

Reference numeral 21 in the drawing denotes a flywheel main body which is connected to the crankshaft of the engine together with the connecting plate 11, and 22 is connected to the outer peripheral edge portion of one annular plate 13 so as to connect the starter motor when the engine is started. It is a ring gear that meshes with a pinion gear (not shown).

Since the centrifugal pendulum vibration absorber 10 has the above-described structure, when the engine is in a normal operating state, the torsional vibration of the power transmission system is caused by the dynamic vibration absorbing action of the rolling of the rollers 17. Absorb. At this time, the rolling of the roller 17 is performed within a range that does not reach the set angle θ, and the rubber ring 20 attached to the annular protrusion 18 of the roller 17 is not in contact with the escape hole 15 which is the bottom surface of the concave guide portion. There is.

Further, when a rapid change in torque occurs at the time of starting or stopping the engine, the annular convex portion 18 of the roller 17 escapes through the rubber ring 20 which is an elastic member.
Abut the wall surface of. At this time, since the rubber ring 20 acts as a buffer, generation of abnormal noise due to the collision between the roller 17 and the rolling chamber 16 is suppressed.

In the case of this vibration absorber, the connecting plate 11 and the annular plate 1
Since the escape hole 15 and the guide hole 14 can be easily formed with high precision in the press holes 2 and 13, respectively, the roller 17 can be smoothly rolled without increasing the manufacturing cost. Obtainable. Also, roller 17
The rubber ring 20 is provided to reduce the collision between the rolling ring 16 and the rolling chamber 16.
As shown in FIG. 3, the ring 17 can be easily attached to the annular convex portion 18 of the roller 17 by fitting in the annular groove 19 as shown in FIG. Since the shape is simple, molding is easy. Therefore, manufacturing at low cost is possible. Further, since the rubber ring 20 is attached to the roller 17 by fitting, the rubber ring 20 can be easily removed, which is advantageous in maintenance.

The embodiment of the present invention is not limited to the one described above. For example, the rubber ring 20 fitted in the annular groove 19 has a rectangular sectional shape as shown in FIG. It is also possible to increase the rigidity of 20 and use a resin material instead of the rubber material as the elastic member fitted into the annular groove 19. Further, in the above-mentioned embodiment, the annular groove 19 is formed on the top surface of the annular convex portion 18 of the roller 17 and the elastic member (rubber ring 20) is fitted therein, but as shown in FIG. Instead of forming the annular groove 19 in the, the annular groove 19 is formed in the bottom surface of the concave guide portion 23,
It is also possible to interpose an elastic member (rubber ring 20) in the groove 19 or to form an annular groove in both the annular convex portion and the concave guide portion so that the elastic member can be fitted in each groove.

Furthermore, in the above-mentioned embodiment, the description is given of the structure in which the concave guide portion is formed on the vibration absorber main body, and the annular convex portion which can be fitted with the concave guide portion is formed on the roller. It is also possible to adopt a structure in which a convex guide portion is formed in the inner peripheral area of the rolling chamber and an annular concave portion that can be fitted with the convex guide portion is formed in the outer peripheral area of the roller. In this case, an annular groove is formed in either or both of the convex guide portion of the rolling chamber and the annular concave portion of the roller,
An elastic member is fitted into the annular groove by fitting.

Next, an embodiment of the invention of claim 2 will be described with reference to FIGS.

In the drawings, reference numeral 30 denotes a centrifugal pendulum type vibration absorber according to the present invention. The vibration absorber 30 includes a connecting plate 11 connected to a crankshaft (not shown) and both sides of the connecting plate 11. The body of the vibration absorber is composed of a pair of annular plates 12 and 13 joined to each other by rivets 25. A plurality of eyebrows-shaped guide holes 14 are formed in both annular plates 12 and 13, and the connecting plate 11 Guide hole 1
An escape hole 15 is formed at a position corresponding to 4. The escape hole 15 is formed to be slightly larger than the guide hole 14 and constitutes a concave guide portion of the rolling chamber 16 together with the guide holes 14. On the other hand, the roller 17 has an annular convex portion 18 formed substantially at the center in the axial direction, and the annular convex portion 18 is fitted into the concave guide portion of the rolling chamber 16. Further, the escape hole 15 is formed deep in a region where the depth from the guide hole 14 is within a set angle where the roller 17 normally rolls, and is shallow in a region where the roller 17 rolls over the set angle. When rolling as described above, the annular convex portion 18 of the roller 17 comes into contact with the wall surface of the escape hole 15.

Between the connecting plate 11 and the annular plates 12 and 13 constituting the main body of the vibration absorber, a thin plate-shaped vibration damping material 31 having excellent vibration absorbing property is interposed. The vibration shock transmitted to the annular plates 12 and 13 is reduced by the vibration isolator 31. As the vibration isolator 31, a thin plate of rubber or resin, or a metal plate coated with rubber or resin on both sides can be used.

Since the centrifugal pendulum type vibration absorber has the above-mentioned structure, when the engine is in a normal operating state, the resonance rolling of the roller 17 absorbs the torsional vibration of the power transmission system, and the torque of the torque is reduced. When the annular convex portion 18 of the roller 17 collides with the wall surface of the escape hole 15 of the connecting plate 11 due to a sudden change, the impact is interposed between the connecting plate 11 and the annular plates 12 and 13. It is reduced by the vibration absorbing action of 31.

When the roller 17 rolls in the rolling chamber 16, the side surface of the annular convex portion 18 of the roller 17 may come into sliding contact with the side edge portion of the guide hole 14, which occurs at this time. As for vibration, the vibration absorbing function of the vibration isolator 31 is reduced.

In the case of this centrifugal pendulum type vibration absorber, due to the extremely simple structure in which the vibration isolator 31 is interposed between each of the connecting plate 11 and the annular plates 12 and 13 constituting the vibration absorber main body, the roller 17 collides with each other. Since it is possible to prevent the generation of abnormal noise, it is possible to keep the manufacturing cost low. Further, since the vibration-damping material 31 is only interposed between the connecting plate 11 and the annular plates 12 and 13, it is extremely easy to assemble and disassemble, which is very advantageous in terms of maintenance.

The embodiment of the present invention is not limited to the one described above. For example, as shown in FIG. 8 and FIG. A concave guide portion is formed by the escape hole 15 of the annular plate 37 and the guide holes 14 of the connecting plates 35 and 36 with the plate 37 interposed, and the annular convex portion 18 of the roller 17 is fitted into the concave guide portion. It can also be applied to a type of vibration absorber.
In this case, the vibration-proof material 31 is the annular plate 37 as shown in FIG.
And the connecting plates 35 and 36, or as shown in FIG. 9, between the inner peripheral edges of the connecting plates 35 and 36. In addition, as shown in FIG. 10, annular covers 40 and 41 having a U-shaped cross section are connected to both sides of the outer peripheral edge of the connecting plate 11 so that the escape hole 15 of the connecting plate 11 and both annular covers 40 and 41 are connected.
It is also possible to apply the present invention to a vibration absorber of the type in which a concave guide portion is formed according to the internal shape of and the annular convex portion 18 of the roller 17 is fitted into this concave guide portion. In this case, the vibration isolator 31 may be interposed between the connecting plate 11 and the annular covers 40 and 41.

[0030]

As described above, according to the present invention, the annular convex portion or the annular concave portion is provided in the outer peripheral area of the roller, and the annular convex portion or the annular concave portion is fitted in the inner peripheral area of the rolling chamber of the vibration absorber body. A concave guide portion or a convex guide portion to be fitted is provided, and at least one of the top surface of the annular convex portion of the roller and the bottom surface of the concave guide portion of the rolling chamber, or the bottom surface of the annular concave portion of the roller. An annular groove is formed on at least one of the top surfaces of the convex guide portions of the rolling chamber, an elastic member is fitted into the annular groove, and a concave guide portion or convex guide portion of the vibration absorber body is formed. In addition, since the elastic member is formed so as to make elastic contact with the vibration absorber main body or the roller when rolling over the set angle of the roller, the elastic member that alleviates the collision of the roller with the rolling chamber can have a simple shape. Also, the rolling chamber can be Can be formed, moreover, the mounting of the elastic member, it is the removal also easily performed.

According to the second aspect of the present invention, the vibration absorber main body is constructed by joining a plurality of plate members, and a vibration isolator is interposed between the plate members, so that abnormal noise is generated due to the collision of the rollers. Since it is reduced by the vibration absorbing action of the vibration isolator, the constituent members can be made into a simple shape, and the constituent members can be easily attached and detached. Further, the vibration generated by the sliding contact between the roller and the rolling chamber can be reduced by the vibration absorbing function of the vibration isolator between the plate members.

Therefore, according to the present invention, it is possible to reliably prevent the generation of the abnormal noise due to the collision of the rollers without increasing the manufacturing cost.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the invention of claim 1;

FIG. 2 is a partial cross-sectional side view showing the same embodiment.

FIG. 3 is an enlarged cross-sectional view showing the same embodiment.

FIG. 4 is an enlarged cross-sectional view showing another embodiment of the invention of claim 1.

FIG. 5 is a sectional view showing still another embodiment of the present invention.

FIG. 6 is a sectional view showing an embodiment of the invention of claim 2;

FIG. 7 is a side view showing the same embodiment.

FIG. 8 is a sectional view showing another embodiment of the invention of claim 2;

FIG. 9 is a sectional view showing another embodiment of the present invention.

FIG. 10 is a sectional view showing still another embodiment of the present invention.

FIG. 11 is a partial cross-sectional side view showing a conventional technique.

FIG. 12 is a sectional view showing the same technique.

[Explanation of symbols]

 10 ... Centrifugal pendulum vibration absorber, 11 ... Connection plate (vibration absorber main body), 12, 13 ... Annular plate (vibration absorber main body), 14 ... Guide hole (concave guide portion), 15 ... Escape hole (concave guide portion), 16 ... Rolling chamber, 17 ... Roller, 18 ... Annular convex part, 19 ... Annular groove, 20 ... Rubber ring (elastic member), 30 ... Centrifugal pendulum vibration absorber, 31 ... Antivibration material.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Masanori Matsuoka, 1370 Onna, Atsugi, Kanagawa Pref., Within Unisia Jecs Co., Ltd. (72) Inventor, Yamaichizaki Ichiro, Takaracho, Kanagawa-ku, Yokohama, Japan Nissan Motor Co., Ltd. In the company

Claims (2)

[Claims] 1. A centrifugal pendulum vibration absorber which accommodates a roller forming a centrifugal pendulum in a rolling chamber formed in a body of the vibration absorber and reduces torsional vibration due to resonance rolling of the roller, in a peripheral area of the roller. An annular convex portion or an annular concave portion is provided, and a concave guide portion or a convex guide portion that is fitted with the annular convex portion or the annular concave portion is provided in the inner peripheral region of the rolling chamber of the vibration absorber body, and the annular shape of the roller At least one of the top surface of the convex portion and the bottom surface of the concave guide portion of the rolling chamber, or
An annular groove is formed on at least one of the bottom surface of the annular concave portion of the roller and the top surface of the convex guide portion of the rolling chamber,
An elastic member is fitted in the annular groove, and the concave guide portion or the convex guide portion of the vibration absorber body is formed so that the elastic member makes elastic contact with the vibration absorber body or the roller when rolling over a set angle of the roller. A centrifugal pendulum type vibration absorber characterized in that 2. A centrifugal pendulum type vibration absorber in which a roller forming a centrifugal pendulum is housed in a rolling chamber formed in the vibration absorber main body, and torsional vibration is reduced by the resonance rolling of the rollers. The centrifugal pendulum type vibration absorber is characterized in that the plate members are joined together and a vibration damping material is interposed between the plate members.