JPH01299341A - Vibration absorption device - Google Patents

Abstract

PURPOSE:To set a resonance magnification to a small one by providing a vibration restraint operation elastic body applied with a gel like substance, at a turning connection part, and conducting the vibration absorption of the rotary displacement of the turning connection part. CONSTITUTION:A vibration absorption device 1 is constituted by being equipped with a movable receiving body 3 which is supported turnably with a turning shaft 2 which is a turning part, as a center, and a base body 8 which is fixed at a stand 7 and supported, and a vibration restraint operation elastic body 12 which is made up of a gel like substance assuming the operation of vibration absorption and a support operation elastic body 15 which is made up of a spring member, both of which are interveniently placed between the bodies 3 and 8. The deformation of the vibration restraint operation elastic body applied with the gel like substance is generally the deformation in a shearing direction, and load-distortion properties do not lose a linear quantity, so the point of resonance, that is to say, the number of proper vibrations can be set low.

Description

[Detailed Description of the Invention] (Purpose of the Invention) (Industrial Application Field) The present invention is useful for preventing vibrations from being transmitted from a source of vibration, such as a prime mover, to other parts, and for use in precision measuring instruments that do not want to be photographed. This relates to a vibration absorbing device that prevents the transmission of vibrations.

(Background of the Invention) Metal springs, rubber, air traction, etc. are generally used as vibration isolation structures between various prime movers, mechanical devices, measuring instruments, etc. and their mounting members. A vibration effect is applied. However, in the case of such vibration damping, elastic restoring force acts on the metal springs, rubber, and air cushions that make up the damping body, so it takes a long time for the imaging to stop completely. Therefore, in such a vibration damping body, an oil damper or the like is also used in order to stop the vibration early. However, even if such measures are taken, they are only effective in the case of low-frequency vibrations, so Ganto Motoyama used a gel-like material that has a large internal friction and has an extremely high damping effect on imaging.
Various types of vibration absorbers with excellent vibration damping effects that can sufficiently cover the necessary frequency range for vibration absorbers can be created by using them in combination with the above vibration dampers or by using gel-like substances themselves as vibration dampers. Developed and filed applications (Japanese Patent Application Laid-Open No. 105318/1982, Japanese Patent Application Laid-open No. 261/1983)
No. 728, Japanese Patent Application No. 63-4036, Japanese Patent Application No. 1983-74
No. 167, etc.).

However, in the past, the method of action of this type of gel-like material was to provide the required vibration absorption function by providing it in areas where compressive or tensile conditions occur, but in order to meet various design requirements, further improvements have been made. There was a need for methodological development.

Technical matters for which development was attempted> The present invention was made in view of this background, and
By setting the gel-like material, which directly bears the vibration-absorbing effect, to receive loads such as rotational torque, we attempted to develop a vibration-absorbing device that can meet even more diversified design requirements.

(Structure of the Invention) Means for Achieving the Object) The first invention of the vibration absorbing device of the present application includes a base body and a movable receiving body that are relatively displaced under load, and both of them are coated with a gel-like substance. In a device in which the movable receiver and the base body are connected to each other in a vibration-absorbing manner via an applied vibration-damping elastic body, the movable receiver and the base body are connected to each other directly or indirectly at a rotational connection portion, and the rotational connection portion The device is characterized in that a damping elastic body is provided on the movable receiver to absorb rotational displacement of the rotary connection portion that responds to displacement between the movable receiver and the base body.

In addition to meeting the above-mentioned requirements, the second invention of the present application is characterized in that a supporting elastic body is further interposed between the base body and the movable receiver.

The present invention attempts to achieve the above object by these means.

<Operation of the Invention> Deformation of a damping elastic body to which a gel-like substance is applied is mainly in the shearing direction, and shear stress is generated in the gel-like substance. With respect to shear stress, as disclosed in Japanese Patent Application No. 63-4036 "Vibration Isolation Support Device", the load-strain characteristic does not lose its linearity, so the resonance point, that is, the natural frequency, can be set low.

Furthermore, since the deformation of the gel material causes internal friction and consumes and absorbs vibration energy, the resonance magnification can also be set small. In addition, a damping elastic body is provided at the rotating part, making it possible to meet even more diversified design requirements.

(Example) The present invention will be specifically described below based on the illustrated example. First, the embodiment shown in FIG. 1.2 will be described. What is indicated by the reference numeral 1 is a vibration absorbing device, which prevents vibrations generated by a motor M, which is a source of vibrations, from being transmitted to a precision measuring instrument 20 or the like that does not like to be photographed. It is installed in the middle of the photographing path to prevent This vibration absorbing device l has a rotating shaft 2 which is a substantial rotating part.
A movable receiver 3 rotatably supported around the center, a base 8 fixedly supported on the pedestal 7, and interposed between the two,
A banded vibration damping elastic body 12 made of a gel-like material that plays a role in vibration absorption.
and a supporting elastic body 15 made of a spring member or the like. More specifically, the movable receiver 3 is connected to the motor M.
A support arm 5 that is formed so as to extend somewhat perpendicularly downward from the center of the lower surface of the catch seat 4, then bend 90' and extend in the horizontal direction; 5 and a support fork 6 for attaching the support arm 5 to the rotation shaft 2.

On the other hand, the base body 8 includes a support block 10 that rotatably supports the rotary shaft 2 at the upper part, and a base plate 9 fixed to the pedestal 7 by bolts or the like at the lower part. The damping elastic body 12 made of a gel-like material has a cylindrical shape, for example, and its outer circumferential surface is adhered to the inner circumferential surface of the bearing part 11 formed in the support block 10, and the control J! i-acting elastic body I2
The inner circumferential surface of the rotary shaft 2 is bonded to the rotating shaft 2. In this embodiment and the embodiments to be described later, in addition to the control elastic body 12, a corresponding force member such as a bearing or a bushing is applied to the rotating portion as necessary. Further, a supporting elastic body 15 made of a spring member or the like is compressed between the vicinity of the bent portion of the support arm 5 and the upper surface of the substrate 9. In this case, a force acts on the damping elastic body 12 in the shearing direction, and a force acts on the supporting elastic body 15 in the compression direction. Of course, this supporting elastic body 15
is applied in the so-called compressive direction, as well as in the tensile direction,
A suitable direction of action, such as a twisting direction or a bending direction, can be applied. Further, depending on the required load, the damping elastic body 12 alone may be sufficient, and may be used alone. The gel material used as the damping elastic body 12 has a penetration value of 50 to 200, preferably 1.
It is best to choose a material with a rating of about 00 to 200 (however, it will differ slightly if a product such as Expancel (trade name, which will be described later) is mixed in).In this example, silicone gel, concrete Specifically, Toray Silicone CF3027 (manufactured by Toray Silicone Co., Ltd.) and KE-1051 (manufactured by Shin-Etsu Chemical Co., Ltd.) are used. Furthermore, it is also possible to use a silicone gel composited by mixing micro hollow spheres called Phyllite (manufactured by Nippon Phyllite Co., Ltd.) or Expancel (sold by Nippon Phyllite Co., Ltd.).

The vibration absorbing device 1 constructed in this manner operates as follows. First, vibrations emitted from the motor M etc. are directly transmitted to the catch seat 4 in the movable receiver 3. In this case, when considering a state in which the damping elastic body 12 and the supporting elastic body 15 do not act at all, the amplitude of the vibration transmitted to the catch seat 4 appears as is as a displacement of the catch seat 4. However, because the damping elastic body 12 and the supporting elastic body 15 are provided, the actual displacement of the seat 4 takes a considerably smaller value than the amplitude of the transmitted vibration.

In particular, on the seat 4 side, the elastic restoring force of the supporting elastic body 15 mainly acts. The vibrations transmitted to the catch seat 4 are also transmitted to the rotating shaft 2 via the support arm 5, but the restoring force mainly exerted by the damping elastic body 12 acts around the rotating shaft 2. In this case, a force acts in the shearing direction on the damping elastic body 12 and shear stress is generated, but in the rotation shaft 2, due to the elastic restoring force by the support elastic body 15 and the provision of the support arm 5, the displacement is already small, so due to the restoring force and damping effect of the damping elastic body 12,
It can adequately handle this shear stress.

As described above, the vibrations generated by the motor M etc. are guided by the action of the damping elastic body 12, but such a technical method can also be applied to the vibration absorbing device 1 having other structures. , the following embodiments may be provided. In the embodiment shown in FIG. 3, instead of the damping elastic body 12 directly bonded to the bearing portion 11 and rotation shaft 2 of the carrying block 10 in the embodiment shown in FIG. The body 12 is constructed in the shape of an element such as an oil seal, and is brought into close contact with the rotating shaft 2 in order to obtain a vibration damping effect. In this embodiment, the damping elastic body 12 can be supplied as a component. When used as a component in this way, it is desirable to form it to the dimensions of an oil seal or the like specified by the Japanese Industrial Standards, etc. Also, in the case shown in FIG. 11 and the support fork 6 in a spacer-like manner,
This spacer-like damping elastic body 12 is bonded to the bearing portion 11 and the support fork 6. In this case, a force acts on the damping elastic body 12 in the tear direction, but the same damping action as in the embodiments described above can be obtained against the shear stress generated by this twisting.

Furthermore, the damping elastic body 12 in this case can be made into a multilayer structure or a single structure by changing the structure of the support fork 6 and the bearing part 11.

Furthermore, the one shown in FIG. 5 is constructed by appropriately providing damping elastic bodies 12 at the pivot points of various link mechanisms, and also providing supporting elastic bodies 15 in tension. First, what is shown in FIG. 5(a) includes a flat plate-shaped catch 4 and a support arm 5 equipped with a pantograph-like link mechanism provided below the catch 4.
a base body 8 comprising a base plate 9 for rotatably supporting the support arm 5 and fixing it to the pedestal 7; a damping elastic body 12 and a support elastic body 3; It consists of a body 15. In this case, the damping elastic body 1
2, those having the structure as explained in FIGS. 81 to 4 above can be applied. The supporting elastic body 15 is supported by the seat 4, for example.

(elastic restoring force is in the compression direction)
The pantograph-shaped links are stretched so that a force is applied to the pantograph. Moreover, the one shown in FIG. 5(b) has a plate-shaped catch seat 4, a plate-shaped base plate 9, and a pivot point approximately halfway between the two, and is configured to be bent. A pair of left and right support arms 5 are provided, and
Between a connecting arm 22 that connects the pivot point provided at the intermediate portion of the support arm 5 and acts so that the left and right support arms 5 are always bent in the same direction, and the seat 4 and the upper surface of the board 9. A supporting elastic body 15 is provided so that a force acts in the compression direction, and a damping elastic body 1 is provided at an appropriate pivot point.
2. Further, in the embodiment shown in FIG. 5(C), the support arms 5 are arranged to cross each other in an X-shape, and a rotation fulcrum is provided at the intersection, and one end of each support arm 5 also rotates. A dynamic fulcrum is provided. The slide pin 23 is guided by a guide recess 24 provided on the side surface of the seat 4 and the base plate 9 and is slidably supported. In addition, this slide bin 23, catch seat 4, and board 9
A supporting elastic body 15 is stretched between each of them so that a force acts in a tensile direction with respect to the load received by the seat 4, and a damping elastic body 12 is provided at the pivot point as appropriate. Furthermore, the embodiment shown in FIG. 5(d) is basically based on the same principle as the embodiment shown in FIG. 5(b), and the support arm 5 is The groove is simplified by removing the pivot point provided in the middle of the groove. Further, in accordance with this, the connecting arm 22 is not provided, and as another embodiment, FIGS. 6(a) and (
b) and those shown in FIGS. 7(a) and (b). What is shown in FIG. 6(a) is a movable receiver 3 comprising a piston-shaped slider 26 provided below a flat plate-shaped receiver 4, and a case where the slider 26 is slidably movable up and down. A base body 8 consisting of a base plate 9 and a support block 10 having a guide portion 27 on the upper side and a bearing portion 11 below the guide portion 27 shares a rotation fulcrum with the rotation shaft 2 and rotates. A crank disk 28 is provided to rotate in synchronization with the rotation of the shaft 2, and a rotation fulcrum is provided at a part of the crank disk 28 and the slider 26, so that they are connected. Attached support arm 5
, a supporting elastic body 15 provided at an appropriate location such as between the seat 4 and the base plate 9, between the slider 26 and the guide part 27, and between the rotation shaft 2 and the bearing part 11. The vibration damping elastic body 12 is provided in the vibration damping elastic body 12. In this embodiment, a crank mechanism is used to convert linear motion by the slider 26 into rotational motion, and damping is performed at the rotational fulcrum.

Further, the one shown in FIG. 6(b) has a movable receiver 3 comprising a plurality of cam claws 30 below a flat plate-shaped receiver 4, and a cam groove 31 into which the cam claws 30 fit. , a base body 8 comprising a rotatably supported cam block 32, and a catch seat 4.
and a damping elastic body 12 provided between the base end of the cam block 32 and the base 8. That is, the vertical displacement that occurs in the catch seat 4 is controlled by the cam pawl 30 and the cam 7j! 31 and converts it into a rotational motion of the cam block 32 by a cam mechanism,
The purpose is to perform a vibration damping action on the base end side of the cam block 32. Furthermore, the one shown in FIGS. 7(a) and (b) is an embodiment incorporating a rack and pinion mechanism,
In FIG. 7(a), a pinion 34 is provided on the seat 4 side, a rack 35 is provided on the board 9 side, and a supporting elastic body 15 is provided between the bottom surface of the seat 4 and the top surface of the board 9,
A damping elastic body 12 is provided between the pinion 34 and the rotating shaft 2. On the other hand, in FIG. 7(b), pinion 3
4 is provided on the base @ 9 side, and the rack 35 is provided on the receiving seat 4 side, and the supporting elastic body 15 is further provided on the base @ 9 side.
A vibration-damping elastic body 12 is provided between the pinion 34 and the rotating shaft 2, as in the embodiment shown in FIG. 7(a). It consists of That is, the seventh
In each of the embodiments shown in FIGS. (a) and (b), a rack and pinion mechanism is used to convert the displacement in the vertical direction that occurs in the catch seat 4 into a displacement in the rotational direction, and a vibration damping effect is applied at the rotational fulcrum of the pinion 34. As described above, the vibration absorbing device 1 of the present invention converts vertical displacement caused by vibration generated from the motor M into rotational displacement, and converts this rotational displacement into rotational displacement. The damping elastic body 12 having a characteristic structure acts to reduce and damp vibration, and in addition to the above-mentioned embodiments, there are also other embodiments based on the same technical idea as these embodiments. Of course it can be applied.

(Effects of the Invention) The vibration absorbing device 1 according to the present invention has the above-described configuration, and focuses on the shear stress acting in the cylindrical direction and the shear stress associated with teardrops, and these shear stresses are generated. By appropriately providing vibration-damping elastic bodies 12 in various parts, this shear stress can be reduced, and the vibrations generated from the motor M etc. can be quickly damped. When using a damping elastic body 12 that can be detachably supplied like a mechanical element,
It can be easily attached to various parts of existing equipment and machines where vibration absorption is required, and can also be easily replaced.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing how the vibration absorbing device of the present invention is used, Fig. 2 is a front view of the same as above, Fig. 3 is an exploded perspective view showing another embodiment of the damping elastic body, and Fig. 4 is the same as above. Furthermore, FIG. 5 is a perspective view showing another embodiment, FIG. 5 is a front view schematically showing various embodiments in which a link mechanism is applied to a vibration absorbing device, and FIG. 6 is a perspective view showing various embodiments in which the same crank mechanism and cam mechanism are applied FIG. 7 is a vertical sectional view skeletally showing two embodiments to which the same rack and pinion mechanism is applied. 1; Vibration absorbing device 2; Rotating shaft 3; Movable receiver 4; Seat 5; Support arm 6; Support fork 7; Frame 8; Base 9; Substrate 10; Support block 11; Bearing portion 12; 15; Supporting elastic body 20; Precision measuring device 22; Connection 7-m 23; Slide pin 24; Guide recess 26; Slider 27; Guide portion 28; Crank disc 30; Cam pawl 31; Cam groove 32; Cam Block 34; Binion 35; Rack 37; Boss M; Motor diagram ()

Claims (2)

[Claims] (1) In a device comprising a base body and a movable receiver which are relatively displaced under load, the two are connected in a vibration-absorbing manner via a vibration-damping elastic body to which a gel-like substance is applied. The body and the base body are connected to each other directly or indirectly at a rotational connection part, and a vibration damping elastic body is provided at this rotation connection part to respond to the displacement of the movable receiver and the base body. A vibration absorbing device configured to absorb rotational displacement of a part. (2) The vibration absorbing device according to claim 1, further comprising a supporting elastic body interposed between the base body and the movable receiver.