JPH0645714Y2 - Dynamic damper mass and spring constant setting device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a mass and spring constant setting device of a dynamic damper in which an elastic body forming a spring of a dynamic damper is arranged between a weight serving as a mass and a vibrating body.

2. Description of the Related Art When a vibrating body such as a vehicle body, various mechanical devices or parts thereof is activated and vibrates, it is more difficult to attach a dynamic damper to the vibrating body in question in order to suppress the amplitude especially at the time of resonance. It is well known.

The dynamic damper uses the elastic body that makes up the spring,
Although it is arranged between the weight as a mass and the vibrating body, the optimum spring constant and mass change depending on the vibrating body to be a target. For this reason, the most suitable mass and spring constant for each vibrating body are experimentally confirmed and set, and the corresponding elastic body and weight are attached to the actual vibrating body.

FIG. 13 shows an example of a conventional mass and spring constant setting device. In this device, an elastic body made of a rubber block 3a is fixed to the vibrating body 30 in question with an adhesive, and a weight 7a made of lead or the like is also fixed to the rubber block 3a by an adhesive. Is. The spring constant of the rubber block 3a constituting the spring of the dynamic damper can be changed by selecting the material thereof, or by cutting a part of the block 3a and changing the shape or the like.
Also, the weight 7a can be changed in its mass by cutting it off or adding another weight with an adhesive.

To determine the most suitable spring constant and mass for the vibrating body 30,
The vibrator 30 is actually vibrated and its amplitude is observed. Then, the spring constant of the elastic body and the mass of the weight are variously changed by the method as described above, and the amplitude of the vibrating body is measured each time. This vibration test is repeated to find the optimum spring constant and mass. As described above, the elastic body and the weight corresponding to the spring constant and the mass obtained by trial and error are attached to the actual vibrating body to suppress the amplitude at the resonance.

As described above, it is possible to set the optimum spring constant and mass even with the conventional setting device, but the work of cutting off or adding the rubber block 3a and the weight 7a is very troublesome, and the optimum value is set. It takes a long time to find out.

It is an object of the present invention to provide a mass and spring constant setting device for a dynamic damper which eliminates the above-mentioned conventional drawbacks and can determine the optimum mass and spring constant easily and in a short time.

In order to achieve the above-mentioned object, the present invention comprises a first case fixed to a vibrating body and a rotatably screwed to the first case. It is housed in a second case movable in a separating direction and an internal space partitioned by the first and second cases, and the second case is rotated in a direction approaching the first case. Due to this, the elastic body, which is compressed and deformed, and the relationship between the displacement amount and the spring constant thereof is confirmed in advance, the disk attached to the elastic body, and the disk fixed to the disk,
A rod extending in the vertical direction of the first and second cases and penetrating the second case and projecting to the outside;
In order to prevent the elastic body from rotating together with the second case when rotating the second case and a desired number of weights detachably attached to the rod portion protruding outside the case. A thrust bearing provided between the elastic body and the second case; a leaf spring slidably fitted in an annular groove formed on the outer peripheral surface of the disk in the circumferential direction; and the leaf spring. A guide roller that is attached to the disk via the guide spring and is in pressure contact with the inner peripheral surface of the second case by the leaf spring, and is formed on the inner peripheral surface of the second case and extends in the longitudinal direction of the case. A mass and spring constant setting device of a dynamic damper is proposed which is provided with a guide groove into which the guide roller is rotatably fitted.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a longitudinal sectional view of a mass and spring constant setting device according to the present invention, FIG. 2 is a lateral sectional view thereof, and FIG. 3 is an exploded perspective view thereof.

In FIG. 1 to FIG. 3, the elastic body forming the spring of the dynamic damper is composed of two rubber bodies 3,103 having a hollow inside.
These rubber bodies 3 and 103 are housed in the internal space defined by the first and second cylindrical cases 1 and 2. A stud 31 is fixed to the upper portion of the first case 1 located on the upper side, and the first case 1 is fixed to the vibrating body 30 by the stud 31 and the nut 32. Further, the male screw formed on the outer peripheral surface of the second case 2 located on the lower side is screwed to the screw formed on the inner peripheral surface of the first case 1. That is, the second case 2 is rotatably screwed to the first case 1, and can move in a direction toward or away from the first case 1 by the rotation. At this time, the upper rubber body 3 contacts the inner upper end surface of the first case 1, and the lower rubber body 103 contacts the lower surface of the second case 2 via the thrust ball bearing 6.

A disc 33 is sandwiched between both rubber bodies 3 and 103, whereby the disc 33 is attached to an elastic body composed of the rubber bodies 3 and 103. The upper end of the rod 5 is integrally fixed to the disc 33, the rod 5 extends in the longitudinal direction of the first and second cases 1 and 2, and passes through the center hole of the lower rubber body 103 and the center of the bearing 6. Penetrates the second case 2 and projects to the outside of the case 2. In this way, a screw is formed on the rod portion protruding to the outside of the second case, and a desired number of weights 7 are detachably screwed and attached to this screw.

As can be seen from the above, the elastic body composed of the two rubber bodies 3 and 103 is attached to the vibrating body 30 via the first and second cases 1 and 2, and the weight 7 is attached via the rod 5 and the disc 33. The dynamic damper is connected to the elastic body and includes an elastic body as a spring and a weight as a mass.

When the second case 2 is rotated in a direction approaching the first case 1, the rubber body 3,103 is compressed and deformed, and conversely, the second case 2 is rotated in the opposite direction, so that the rubber body 3,103 is restored to the original state. Can be returned to the state. In this way the rubber body 3,103
The spring constant can be changed by elastically deforming. FIG. 4 shows both rubber bodies 3 from the state of FIG.
It is an example of a graph showing the relationship between the displacement amount l and the spring constant when 103 is compressed and deformed by l. This relationship should be confirmed before the rubber bodies 3 and 103 are attached to both cases 1 and 2. . Therefore, the spring constant of the rubber bodies 3, 103 at that time can be known from the displacement amount 1 of the case 1.

When the second case 2 is rotated to adjust the spring constant, the rubber bodies 3 and 103 do not rotate, and the repulsive force acts on the second case 2, but since this force is received by the thrust bearing 6, The rotation of the second case 2 is not hindered. In this way, the thrust bearing 6 interposed between the elastic body and the second case 2 prevents the elastic body from rotating together with the second case 2 when the second case 2 is rotated. Use to prevent.

As described above, a desired number of weights 7 are attached to the rod 5, and FIG. 1 shows a state in which three weights 7 are attached.

To set the optimum spring constant and mass of the dynamic damper for the target vibrating body,
Is actually oscillated, the amplitude at that time is observed, and such an operation is performed by changing the spring constant and the mass variously to find the optimum value. At this time, the spring constant of the rubber body 3103 which is an elastic body is
It can be adjusted simply by rotating the second case 2, and the mass can be adjusted simply by selecting the number of weights 7 to be attached to the rod 5. The operation is extremely simple and can be performed in a short time. it can. There is no need for complicated work such as cutting off the rubber block or the weight or attaching the weight with an adhesive as in the past.

Also, when the second case 2 is rotated to adjust the spring constant, the rubber bodies 3 and 103 do not rotate and are not twisted. You can

The "usage range" in FIG. 4 shows the numerical range in which the spring constants of the rubber bodies 3 and 103 are actually used, and the spring constant is uniquely set by setting the displacement amount l in this range. The spring constant can be set correctly without erroneous operation.

Further, in order to prevent the weight 7 from moving laterally with respect to the cases 1 and 2 when the second case 2 is rotated or the vibrating body 30 is vibrated, it is composed of, for example, a bearing. An appropriate number of guide rollers 4 are provided. These guide rollers 4 are rotatably supported by a supporting member 36 as shown in FIGS. 5 and 6, and a leaf spring 37 fixed to the supporting member 36 is formed in an annular groove formed on the disk 33. 38 is slidably fitted in the circumferential direction of each roller 4
Is rotatably fitted in a guide groove 39 formed on the inner peripheral surface of the second case 2. The guide groove 39 extends in the vertical direction of the second case 2.

In this way, the guide roller 4 is transferred to the disc through the leaf spring 37.
By mounting the guide roller 4 on the inner peripheral surface of the second case 2 with the spring 37, the rubber body 3,
The rod 5 and the weight 7 with respect to the second case 2 are not hindered in the relative movement of the 103 and the second case 2 in the vertical direction.
It is possible to prevent lateral movement. This makes it possible to accurately determine the optimum spring constant and mass of the dynamic damper for the target vibrating body 30.

Also, when the second case 2 is rotated as described above,
The rubber bodies 3 and 103 do not rotate together with the second case 2, but since the guide roller 4 is fitted in the guide groove 3a of the second case, the roller 4 and the leaf spring 37 are arranged together with the second case 2. It rotates, at which time the leaf spring 37 slides in the annular groove 38 of the disc 33. Therefore, when the second case 2 is rotated, a large external force due to friction between the guide roller 4 and the inner peripheral surfaces of the second case 2 does not act on the inner peripheral surfaces of the second case 2, and it is possible to prevent a problem in which they are scratched.

In the above embodiment, the elastic body is composed of the two rubber bodies 3 and 103, but the number can be set to an appropriate number including one. Further, by appropriately selecting this number and its material, the spring constant characteristic of the elastic body can be changed to set the optimum spring constant within the usage range. As a matter of course, the elastic body is not limited to the rubber body, and may be any suitable one such as a conical coil spring as shown in FIG. 7 (a), a coiled spring as shown in FIG. It is also possible to use an elastic body such as a spiral coil flange or a bamboo spring as shown in FIG. 3D, and the number thereof can be appropriately selected.

FIG. 8 is an explanatory diagram showing an example in which the dynamic damper whose spring constant and mass are determined as described above is actually used for each member of the vehicle body. In the portion indicated by A in the figure, as shown in FIGS. 9A and 9B, the elastic body 203 made of rubber is fixed to the vibrating body made of the transmission support member 30a. Weight 207
Is fixed. 8B, as shown in FIGS. 10A and 10B, the elastic body 303 made of rubber is fixed to the vibrating body made of the rear suspension member 30b via the bracket 40, and the elastic body 303 made of iron is fixed to the vibrating body 303. The weight 307 is fixed. In the portion C of FIG. 8, as shown in FIGS. 11A and 11B, the rear suspension member
A bracket 41 is welded to a vibrating body of 30c, and an iron weight 407 is fixed to a mounting plate 42 bolted to the vibrating body via an elastic body 403 made of rubber. The example shown in FIG. 12 shows a bracket 44 welded to the exhaust pipe 43.
The mounting plate 45 is bolted to the rubber elastic body 50
A weight 507 made of iron is fixed via 3.

As described above, the dynamic damper is used by being attached to various vibrators. In any case, the spring constant and mass are set to the optimum numbers by the setting device according to the present invention, and the spring constant corresponding to this is set. A damper having a mass and a mass is attached to each actual vibration body.

Effect According to the present invention, the spring constant and mass of the dynamic damper can be set to optimum values easily and in a short time.

Moreover, since the thrust bearing is provided between the elastic body and the second case, when the second case 2 is rotated to adjust the spring constant, the elastic body is rotated and twisted. The proper spring constant can be correctly known from the amount of displacement of the elastic body.

Further, due to the configuration of the leaf spring, the guide roller, and the guide groove, when the second case is rotated or when the vibrating body is vibrated, relative movement of the elastic body and the second case in the vertical direction is performed. Without interfering, lateral movement of the rod and the weight with respect to the second case can be prevented, whereby
The optimum spring constant and mass of the dynamic damper can be set correctly. Moreover, when the second case is rotated, the guide roller is fitted in the guide groove of the second case, so that the roller and the leaf spring rotate together with the second case, and at that time, the leaf spring causes the disc to rotate. Slide in the circular groove. Therefore, a large external force due to friction between these does not act on the inner peripheral surfaces of the guide roller and the second case, and it is possible to prevent the problem of scratching these and to use the setting device for a long period of time. it can.

[Brief description of drawings]

1 is a vertical sectional view of a setting device according to the present invention, FIG. 2 is a sectional view taken along line II-II of FIG. 1, FIG. 3 is an exploded perspective view thereof, and FIG.
The figure is a graph showing an example of the relationship between the displacement amount of the elastic body and the spring constant, FIGS. 5 and 6 are exploded perspective views showing an example of the support structure of the guide roller, and FIGS. 7 (a) to 7 (d) are FIG. 8 is a cross-sectional view illustrating an elastic body other than a rubber body, FIG. 8 is a perspective view of a vehicle body to which a dynamic damper is attached, FIG. 9 (a),
(B), FIG. 10 (a), (b), and FIG. 11 (a),
(B) is explanatory drawing which shows the dynamic damper mounted in each part of a vehicle body, FIG. 12 is a perspective view of the dynamic damper attached to the exhaust pipe, and FIG. 13 is a front view of the conventional setting device. . 1 ... First case, 2 ... Second case 4 ... Guide roller, 5 ... Rod 6 ... Thrust bearing, 7 ... Weight 30 ... Vibrating body, 33 ... Disk 37 ... Plate Spring, 38 ... Annular groove, 39 ... Guide groove

Claims (1)

[Scope of utility model registration request] 1. A first case fixed to a vibrating body, and rotatably screwed to the first case, and can move in a direction approaching or separating from the first case by the rotation. The second case and the internal space partitioned by the first and second cases are compressed and deformed by rotating the second case in a direction approaching the first case, An elastic body in which the relationship between the displacement amount and the spring constant is confirmed in advance, a disc attached to the elastic body, fixed to the disc, extending in the longitudinal direction of the first and second cases, and A rod penetrating the second case and projecting to the outside, a desired number of weights detachably attached to the rod part projecting to the outside of the second case, and rotating the second case, The elastic body turns with the second case In order to prevent this, the thrust bearing interposed between the elastic body and the second case and the annular groove formed on the outer peripheral surface of the disk are slidably fitted in the circumferential direction. A leaf spring, a guide roller attached to the disk via the leaf spring, and in contact with the inner peripheral surface of the second case by the leaf spring, and a guide roller formed on the inner peripheral surface of the second case. And a spring constant setting device for the dynamic damper, which comprises a guide groove extending in the longitudinal direction of the guide roller and into which the guide roller is rotatably fitted.