JP2000046116A - Revolving speed adaptive vibration absorber - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a vibration absorber so as not to generate noise at stopping or starting time of rotary motion of a shaft, and improve absorption of rotational vibration superimposed on the rotary motion by connecting at least two parts among parts making relative motion by a regulating guide. SOLUTION: At least two parts among inertial mass members 2, the hub parts 1 and bolts 6 are connected by a regulating guide. The inertial mass members 2 adjacent in the circumferential direction are connected by chain links 11 so as to be turnable. A space of a single chain link 11 is arranged in the circumferential direction between the adjacent inertial mass members 2. Synchronous relative motion of all the inertial mass members 2 connected in the circumferential direction by the chain links 11 and the chain links is reliably made. Thus, an absorbing effect obtained by this is ideal.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotational speed adaptive vibration absorber for a shaft rotating about an axis. More specifically, a plurality of circumferentially adjacent inertial mass members are respectively supported on the hub portion by two circumferentially adjacent holding portions, and the holding portions include bolts, and the bolts include the inertial mass member and the hub. It is possible to roll on a curved orbit curved in the opposite direction of the part, and when this rolling causes rotational vibration superimposed on the rotational movement, it turns into a curved working orbit defined by the curved orbit and the bolt. Along with a variable rotational speed adaptive vibration absorber in which the distance between the shaft and the inertial mass member varies.

[0002]

2. Description of the Related Art This type of vibration absorber is GB PS 598 811.
Are known. In this device, the holding portion is formed of a relatively large-diameter through hole, which penetrates the hub portion and the inertial mass member in a direction parallel to the axis, and further incorporates a relatively small-diameter bolt. ing. This creates a considerable play or free space in the radial direction between the through hole and the bolt. This play results in the inertial mass moving radially outward as the vibration absorber rotates, thereby causing the bolt to move on the working track. When the shaft stops, the inertial mass members arranged in the circumferential direction now move downward according to the law of gravity, unlike before. As a result, noise is generated each time the shaft stops and starts.

On the shaft of a machine that operates periodically, for example, the crankshaft of an internal combustion engine, rotational vibrations superimposed on the rotational motion occur. This rotational vibration occurs due to the rotational movement, and the frequency changes with the rotational speed of the rotating shaft. For such vibrations, the absorption capacity provided by known vibration absorbers is not yet satisfactory.

[0004]

SUMMARY OF THE INVENTION It is an object of the invention to improve a speed-adaptive vibration absorber of the type mentioned at the outset in such a way that noise is not generated when the rotation of the shaft stops or starts. It is to remarkably improve the absorption of rotational vibration superimposed on rotational motion.

[0005]

SUMMARY OF THE INVENTION The object of the present invention is to provide a speed-adaptive vibration absorber according to the invention, that is, a speed-adaptive vibration absorber for a shaft, including a hub part, rotatable about an axis. A plurality of circumferentially adjacent inertial mass members are respectively attached to two circumferentially adjacent holding portions of the hub portion, and the holding portions include bolts, and the bolts are opposite to each other of the inertial mass member and the hub portion. It is possible to roll on a curved orbit curved in the direction, and when this rolling generates rotational vibration superimposed on the rotational motion, the shaft and the inertial mass along the working orbit defined by the curved orbit and the bolt In the rotational speed adaptive vibration absorber in which the distance between the members changes or shrinks, at least two of the components that move relative to each other, that is, the inertial mass member, the hub portion, and the bolt, are controlled by the regulating guide. It is connected is solved by the rotational speed adaptive vibration absorber according to claim. The dependent claims relate to structures having further features.

In the rotational speed adaptive vibration absorber according to the present invention, a mechanism is employed in which at least two of the components that move relative to each other, that is, the inertial mass member, the hub portion, and the bolt are connected by a regulating guide. I have. The parts which are connected by the regulating guide and make relative movements thereby only perform synchronous movements with one another, so that the vibration absorbing capacity is improved. Furthermore, the generation of noise at the time of stopping and starting the rotational vibration absorber decreases as the ratio of the relative moving parts connected by the regulating guide increases. Therefore, it is expedient that all the parts which make a relative movement are connected by the regulating guide.

The inertial mass member interconnected to the hub portion or relative motion component by a regulating guide can move only along the previously specified trajectory, so that when the rotational motion is stopped or when the rotational motion is stopped. Noise generation at start-up is eliminated. Furthermore, the occurrence of asynchronous relative movement of the individual inertial mass members is eliminated by the regulating guide. As a result, the inertial mass member is prevented from moving freely, whereby the vibration absorbing ability can be maximized. As a result, the fundamental expected vibration absorbing effect is significantly improved.

According to the present invention, as one of the characteristic mechanisms, a mechanism in which the guide mechanism includes at least one first cover plate connecting two bolts attached to each inertial mass member is employed. are doing. Accordingly, when a rotational vibration superimposed on the rotational movement occurs in the vibration absorbing device, the plurality of inertial mass members are synchronously moved relative to each other in a radial direction, thereby being significantly larger than the size of the inertial mass member used. The ability to absorb can be obtained.

[0009] In a rotational speed adaptive vibration absorber in which an inertial mass member can move on an arc-shaped operating trajectory whose center is maintained at a fixed distance from the axis of the rotational speed adaptive vibration absorber, a cover is provided. It is noted that the guide mechanism is constituted by at least one swing lever which is fitted to the plate or each bolt by a sub-guide and connects the inertial mass member to the hub portion. This further simplifies the synchronization of the movements of the bolts, so that the bolts are prevented from moving on their own or from falling off the inwardly curved, curved or arcuate working track. This is a significant feature for obtaining a good vibration absorbing effect.

When applied to the intended use, a large centrifugal force is applied to the inertial mass member in accordance with each rotation, which is transmitted to the hub portion via a bolt and moves as far as possible from the regulating guide. Here, in addition to the above-described structure, the feature is that the bolt or the cover plate moves along the sub-guide so that the bolt or the cover plate can be displaced more in the radial direction than in the circumferential direction. The sub-guide can be constituted by, for example, a slot that surrounds the cover plate or the guide pin having a boss shape in the axial direction of the bolt so as to be movable in the radial direction. In order for the aforementioned cover plate to move in the center, i.e., to be displaced substantially only in the radial direction, only the swing lever is required, so that the structure of the present invention is cost-effective. Becomes

As another mechanism having a feature, a mechanism for connecting at least two circumferentially adjacent inertial mass members by a chain link is employed. This prevents asynchronous relative movement of the inertial mass member and further enhances the intended vibration absorbing capacity. When applied to the original application, to prevent the centrifugal force transmitted to the hub part via bolts from being absorbed by individual chain links and inertial mass members due to unfavorable finishing tolerances, and weakened. ,
A space is provided for at least one chain link in the circumferential direction between adjacent inertial mass members, that is, at least one location is characterized by the fact that two adjacent inertial mass members are not connected by the chain link. .

[0012] The regulating guide may further comprise a guide portion provided with a guide track or a guide groove at both circumferential ends of the inertial mass member and / or the inertial mass member of the hub portion,
It is possible for this guide track to be fitted with the guide element of the respective opposing part, namely the inertial mass member and / or the hub part. Here, the guide track is a boss-shaped guide rail or slot forming a component of the hub part and / or the inertial mass member;
It is possible to configure by notch. The guide track is shaped so as to remarkably avoid unintentional movement of the inertial mass member in relation to the hub portion. However, it is not preferable here that any load is transmitted from the inertial mass member to the hub portion via the guide track. In this respect, it is characteristic that there is play between the guide track and the respective guide element. This play allows the guide element to slide on the guide track, so that relative movement of the inertial mass in relation to the hub part is easily obtained and good sliding is obtained. The finish tolerances that must be ensured to achieve this goal are well known to those skilled in the art. The guide trajectory usually has an arc-shaped trajectory. Therefore, fabrication is easy.

From a structural point of view, it is possible to form the hub portion into a flange shape, and to attach a pair of adjacent inertial mass members in pairs on both sides in the axial direction of the hub portion and in the region of the outer peripheral portion. is there. The two inertial mass members and the cover plates or chain links, which are respectively adjacent in the axial direction, are firmly connected to one another in such a way as to limit the asynchronous relative movement of the individual elements in the intended application. The resulting functional reliability and absorption effect are significantly improved.

The rotational speed adaptive vibration absorber according to the present invention can be applied in many fields. Preference is given to the use of reciprocating engines, piston engines, for example at the front or rear end of the crankshaft of internal combustion engines.

[0015]

1 to 4 show a rotational speed adaptive vibration absorber for a shaft which rotates about a shaft 7. FIG. Members having similar functions are given the same reference numerals. In the present device, a plurality of inertial mass members 2 circumferentially adjacent to a hub portion 1 are provided with two holding portions 3 adjacent to each other in a circumferential direction.
And the holding part comprises bolts, which are curved in the opposite directions of the inertial mass member 2 on the one hand and of the hub part 1 on the other hand, i. It is possible to roll on the top, and when this rolling generates rotational vibration superimposed on the rotational movement,
A mechanism is provided in which the distance between the shaft 7 and the inertial mass member 2 varies along the curved working trajectory, usually along the groove of an arcuate curved trajectory. Here, being curved in opposite directions means that the respective curved portions of the hub portion 1 and the inertial mass member 2 are arranged so as to face each other, that is, the curved trajectory in the hub portion has While the curved portion points in the direction of the axis 7, the curved trajectory in the inertial mass member 2 shows that the curved portion
And facing radially outward. In the present invention,
At least two parts of the inertial mass member 2, the hub portion 1, and the bolt 6 are connected by a regulating guide.

FIG. 1 shows an inertial mass member 2 adjacent in the circumferential direction.
Shows a structure that is pivotally connected by a chain link 11 and, as shown in the lower part of the figure, a space for one chain link 11 is provided in the circumferential direction between adjacent inertial mass members 2. ing. That is, adjacent portions of one inertial mass member 2 are not connected by a chain link. As a result, the circumferential length of each unit composed of the chain link and the inertial mass member 2 connected in the circumferential direction becomes variable, and the centrifugal force acting on the inertial mass member 2 when the shaft rotates is finally held. Part 3, that is, curved trajectories 4, 5 curved in opposite directions to each other
It is reliably transmitted to the hub part 1 via the bolts 6 acting together. The above is the main precondition for obtaining the absorbing effect according to the present invention for the rotational vibration generated in the rotating shaft. Synchronous relative movement of all the inertial mass members 2 and the chain links connected in the circumferential direction by the chain links 11 is ensured. Therefore, the absorption effect obtained by this is ideal. Since this absorption effect does not involve heat conversion of energy, energy transmitted from the rotating shaft during the generation of rotational vibration is not accumulated in the shaft, and thus has basically a great advantage. This also makes it possible to further reduce the dynamic load on the shaft part.

FIG. 2 shows the structure of a regulating guide for the inertial mass member 2 which can be used as an alternative or complement and which is spaced at different circumferential positions. M1 is a part of the casing, M2 is a mounting portion for assembly, M3 is a recess in the hub portion,
4 is a bore for mounting parts. In FIG. 2, for convenience, the hub portion 1 surrounds the inertial mass member 2 on both sides in the axial direction of the shaft 7 in the left half, and conversely, the inertial mass member 2 surrounds the hub portions on both sides in the axial direction of the shaft 7 in the right half. 1 shows a vibration absorbing device having a structure surrounding the vibration absorbing device 1. In the left half of FIG. 2, the hub portion to be positioned on the upper side in the figure is removed to expose the inertial mass member 2, and in the right half, the cover or plate of the housing portion is removed to expose the inertial mass member 2. Is shown. Since the regulating guides which are usually arranged in the circumferential direction have the same shape, they are easy to manufacture, and are also effective in preventing a non-equilibrium state. However, regulation guides may be designed individually for special applications. The structure of the regulation guide for special applications has, for example, the following features.

The lower left portion of FIG. 2 shows a state in which the upper inertia mass member 2 is removed in the figure, and a guide mechanism or a regulating guide is provided with two bolts attached to the lower inertia mass member 2. 6 shows a structure composed of at least one cover plate 8 connected to a circular path 6 so as to be able to move in a circumferential direction on a curved track. Such a cover plate 8 can be attached to both ends in the axial direction of the inertial mass member 2 in order to prevent generation of a moment applied to the bolt 6.

The upper left part of FIG. 2 shows a modification of the regulation guide which is similar to the above-described structure. FIG. 3 shows a cross section of this portion, that is, a cross section taken along line AA of FIG. Here, the regulation guide is further constituted by a swing lever 9 attached to the cover plate 8 at the center connecting the axes of the bolts 6 located on both sides of the cover plate 8. This swing lever 9
For example, the guide pin 10.1 and the sub-guide 10 that can be formed as a part of the cover plate 8 allow the sub-guide 10 to be flexibly fitted to the cover plate 8, that is, the cover plate 8 is displaceably fitted to the swing lever 9, The inertial mass member 2 is pivotably connected to the hub portion 1. In this configuration, the swing lever 9 is pivotable with the cover plate 8 at the center, and a pin
It is secured to the inertial mass member 2 by 9.2, while being fixed to the hub part 1 by pins 9.1. In this method, different radial surfaces are connected by a crank structure as shown in FIG. In order to prevent a radial force of the inertial mass member 2 from being generated on the swing lever 9, the swing lever 9 has a small play in the circumferential direction and a large play in the radial direction. With this structure, the bolt 6 or the cover plate 8 is small in the circumferential direction and has a large play in the radial direction.
Move along 10. That is, the bolt 6 or the cover plate 8 can be displaced more in the radial direction than in the circumferential direction along the sub-guide 10. With such a configuration, the cover plate 8 moves along the sub guide 10, and as a result of the movement of the cover plate 8, the bolt 6 moves. Alternatively, with this configuration, the swing lever 9 can be displaced in the radial direction with respect to other portions.

The upper right part of FIG. 2 shows a structure in which the regulating guide is composed of two swing levers 9 '. In this structure, the swing lever 9' is fitted to the bolt 6 with the sub-guide 10 '. Then, the inertial mass member 2 is connected to the hub portion 1.
It is linked to Also in this method, when the bolt 6 and the inertial mass member 2 generate the rotational vibration superimposed on the rotational movement of the shaft, it is easy to perform only the synchronous movement on the circular orbit.

The right part of FIG. 2 is a regulating guide constituted by a guide portion provided with a guide track 12 of the inertial mass member 2 and / or the hub portion 1 located at a circumferential end of the inertial mass member 2, for example. The structure of is shown. In this embodiment, the guide portion is a cover or a plate of the housing portion.
For example, a guide groove is provided on each of 16 and 17 so as to face the inertial mass member 2. For convenience of description, FIG. 2 exemplarily shows the shape and position of the guide track 12 provided as a guide groove provided in the housing as a visible one. This guide track 12 has a guide element of the respective opposing part, ie the hub part 1 or the inertial mass member 2.
15 is fitted. When the rotational movement is started, the guide element 15 is used to ensure that the centrifugal force acting on the inertial mass member 2 mainly acts on the hub portion 1 only through the holding portion 3.
There is also some play between the guideway or guideway 12 and the respective guide element 15 so that the guideway 12 can slide on the guideway 12.

From a structural point of view, it is possible to form the hub portion into a flange shape, and to attach a pair of adjacent inertial mass members in pairs on both sides in the axial direction of the hub portion and in the region of the outer peripheral portion. is there. The axially adjacent two-sided inertial mass members and the cover plates or chain links are preferably interconnected in their intended application so as to suppress the asynchronous relative movement of the individual elements.

FIG. 4 shows a longitudinal section of the rotational speed adaptive vibration absorber, that is, a section taken along the line BB in FIG. 2, and the hub portion 1 has a substantially flange shape. The hub part 1 is provided with a pair of axially opposed inertial mass members 2 which are mounted by axially penetrating bolts 6 and in a manner not shown in the figures. Each is securely connected. When a rotational vibration occurs that is superimposed on the rotational movement, this in principle results in a complete synchronous relative movement of the proof mass 2 with respect to the hub part 1. This is a great advantage for obtaining the maximum absorption effect.

In the structure shown in FIG. 4, the inertial mass member 2 is moved in both directions by the swing lever 9 in the manner described above, and is further housed in an outer sealed chamber containing a small amount of lubricating oil. As a result, no abrasion occurs even when the apparatus is continuously operated.

The rotational speed adaptive vibration absorber according to the present invention can be applied in many fields. Particularly preferred applications are the reciprocating engines, piston engines, for example the front or rear end of the crankshaft of internal combustion engines.

[0026]

According to the present invention, there is provided a rotational speed adaptive vibration absorbing device for a shaft rotating about an axis, wherein a plurality of circumferentially adjacent inertial mass members are provided on a hub portion of two circumferentially adjacent inertial mass members. Attached to the holding part, the holding part includes a bolt,
This bolt can roll on a curved orbit with a curved surface in the opposite direction of the inertial mass member and the hub part, and when this rolling causes rotational vibration to be superimposed on the rotational motion, the Along the defined working trajectory,
A rotational speed adaptive vibration absorber in which a distance between a shaft and an inertial mass member is reduced, wherein at least two parts of an inertial mass member, a hub portion, and a bolt are connected by a regulating guide. It is an adaptive vibration absorber.

[Brief description of the drawings]

FIG. 1 is a front view showing a first structure of a rotational speed adaptive vibration absorber.

FIG. 2 is a front view showing the structure of a rotational speed adaptive vibration absorber having a structure similar to that of FIG. 1, showing that a differently shaped regulating guide can be connected to an opposing movable part at different circumferential positions; Illustrated. However, also in this case, usually, the guide mechanisms constituting the restriction guides arranged in the circumferential direction have a common structure. Here, in the left half, the hub portion surrounds the inertial mass member on both axial sides of the shaft, and in the right half, on the contrary, the inertial mass member surrounds the hub portion on both axial sides of the shaft. Is shown.

FIG. 3 is a cross-sectional view of the rotational speed adaptive vibration absorber along the line AA in FIG. 2;

FIG. 4 is a sectional view of the rotational speed adaptive vibration absorbing device taken along line BB in FIG. 2;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hub part 2 Inertial mass member 3 Holding part 4, 5 Curved track 6 Bolt 7 Shaft 8 Cover plate 9 Swing lever 10 Sub guide 11 Chain link 12 Guide track

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hans-Gerd Eckel, 69514 Rodenbach, Germany, Wagner Strasse 11 (72) Inventor, Lydia Weiss 69168 Wieslotch, Germany, Karl-Herman-Zahn-Strase 1 (72) Inventor Hans-Gerhard Thunder, 69469 Weinheim, Germany, Holzweg 3, Germany

Claims (10)

[Claims] 1. A rotational speed adaptive vibration absorbing device for a shaft including a hub portion rotatable about an axis, wherein a plurality of inertial mass members circumferentially adjacent to the hub portion each have a circumferential portion. Attached to two holding members which are adjacent to each other in the direction, the holding member includes a bolt, and the bolt is capable of rolling on oppositely curved curved tracks of the inertial mass member and the hub portion. When a rotational vibration that is superimposed on the rotational motion is generated by the rolling, a rotational speed adaptive type in which a distance between the shaft and the inertial mass member changes along an operating trajectory defined by the curved trajectory and the bolt. A rotational speed adaptive vibration absorbing device, wherein at least two of the components that move relative to each other are connected by a regulating guide. 2. The method according to claim 1, wherein the regulating guide is provided with each of the inertial mass members.
And at least one first cover plate (8) connected to the two bolts (6) mounted on the shaft so as to be rollable in the circumferential direction of the rotational speed adaptive vibration absorber.
A rotational speed adaptive vibration absorber according to the description. The inertial mass member is capable of moving along an arc-shaped operating trajectory whose center is maintained at a fixed distance from the shaft.
And the inertial mass member 2 and the hub portion 1 are connected to each other so as to be pivotable with each other.
The rotational speed adaptive vibration absorbing device according to claim 2, comprising at least one swing lever 9. 4. The bolt 6 or the cover plate 8 moves along a sub-guide 10 so that the bolt 6 or the cover plate 8 can be displaced more in the radial direction than in the circumferential direction. A rotational speed adaptive vibration absorber according to the description. 5. At least two circumferentially adjacent inertial mass members 2 are connected via a chain link 11.
The rotational speed adaptive vibration absorbing device according to claim 1. 6. The rotational speed adaptive vibration absorber according to claim 5, wherein a space for at least one chain link is provided in a circumferential direction between the inertial mass members adjacent to each other. 7. The regulation guide according to claim 1, wherein the inertia mass member and / or
Or a guide part provided with guide tracks 12 at both ends of the hub portion 1 in the circumferential direction of the inertial mass member 2, wherein the guide tracks 12 are guide elements of respective opposing portions.
The rotational speed adaptive vibration absorbing device according to any one of claims 1 to 7, wherein the vibration absorbing device is fitted with the rotational speed adjusting device. 8. The rotational speed according to claim 7, wherein a play is provided between said guide track 12 and each guide element 15 so that said guide element 15 can slide on said guide track 12. Adaptive vibration absorber. 9. At least two of the inertial mass member 2, the cover plate 8 or the chain link 11 are axially adjacent to each other, and the axially adjacent inertial mass member 2, the cover plate 8 or the chain link 11 is provided. 11 are interconnected, whereby the inertial mass member 2 and the cover plate 8
The rotational speed adaptive vibration absorber according to any one of claims 1 to 8, wherein asynchronous relative motion does not occur between the chain link (11) and the chain link (11). 10. The rotational speed adaptive vibration absorber according to claim 1, which is used in a crankshaft of a piston engine, particularly a reciprocating internal combustion engine.