JPS5929832A - Damping device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a damping device for damping the relative motion of two rigid bodies using a fluid restriction in a fluid channel or the like.
In particular, among these devices, a sealed case formed by two rigid parts each capable of being coupled with two rigid bodies to be damped and connected in a sealing manner by an annular rubber or elastic member; a partition having a through hole dividing the interior of the case into two compartments; and a second compartment in contact with one of the two compartments and the partition partially defined by a resilient member. A damping device comprising a liquid filling at least a portion of a chamber.

In such a damping device, a force acting on one of the rigid elements in the direction of the other rigid element causes a relative movement of the two rigid parts and a deformation of the intermediate member of elastic material. , the interior volume of the first compartment changes to allow liquid to flow from one compartment to the other through the passageway. A limb of liquid through this passage results in a damping of the relative motion in question.

In such a damping device, it is advantageous for the two rigid elements to attract each other, resulting in a reduction in the axial and transverse dimensions of the first compartment. As a result, the volume of liquid that is forced to move from this compartment to other compartments through the passageway becomes considerably large. The rigid elements move away from each other (and of course the liquid flows correspondingly faster through the passage in the opposite direction than before).

Now, in a known example of a damping device of the kind in question, the annular resilient member is forced to become axially shortened by the mutual tension of the rigid elements to which it is connected. , move only under compression in the f-axis direction, producing relatively small lateral deformations, or move into the first compartment in the j-axis direction and contribute to its contraction in the axial rather than the lateral direction. or, if not, the axial contraction of each of the first compartments is compensated for and, at least in part, neutralized by its lateral expansion instead of being reinforced by its lateral contraction. , undergoes a lateral expansion that is contrary to the desired effect.

The invention automatically ensures a lateral reduction of the volume of the first compartment simultaneously with its axial reduction, or vice versa, due to the deformation of the annular elastic member into a special mode. specifically for the purpose. This also significantly reduces the lateral space occupied by the case. For this purpose, the annular elastic member has a C-shape with half of its axial cross section open to the outside, its axis of symmetry extending perpendicular to the axis of this member. Therefore, when this member is compressed in the axial direction, its elastic material simultaneously enters laterally towards the interior of the compartment, and the opposite occurs when the member is compressed in the transverse direction perpendicular to the axis.

In the preferred embodiment, one or more of the following devices are additionally required:

- each of the axial ends of the elastic member has the shape of an axially flared dog's paw in half of its axial cross section;

each of the axial ends of the resilient member is joined to a corresponding cylindrical interior region of the opposing rigid component; each of which is joined to a lateral flat annular formation or region of a corresponding rigid part; one resilient member which is connected to the corresponding bottom of the first compartment during operation of the device; ``Liquid Corner'' in between.

designed and/or fitted to avoid the formation of - the damping device is mounted parallel to the spring; in some written damping devices, one axial end of the spring is connected to one of the rigid parts defining the case;
Its other axial end is connected to another rigid frame of another rigid part defining the case, and after assembly of the assembly between these two rigid elements, this rigid frame and this other Provided with means of fixing together the rigid parts of, in particular by welding, a sealed, flexible membrane in which part of the wall of the compartment of part 1 undergoes limited deformation in the direction of amplitude. Determined by.

In addition to these main devices, the invention also includes other devices, preferably used simultaneously. Other devices will be detailed later. Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. Of course, the invention is in no way limited to this example. FIG. 1 is an axial vertical cross-sectional view of a damping device according to the present invention, FIG. 2 is an explanatory diagram, and FIG.
The figure is a more detailed axial vertical cross-sectional view than in FIG. 1 of the support part of the damping device according to the invention.

In either case, the damping device is constituted by a sealed case 1, which is considered to be mounted vertically between a lower support, such as the chassis of a vehicle, and an upper support, such as the engine of the vehicle.

This case 1 has a plate-shaped lower rigid bottom plate 2,
It consists of an upper rigid cover 3 and an intermediate T-shaped member 4 of resilient sealing material (rubber or elastic material) joined to the vertical veins of the bottom plate 2 and cover 3, respectively. A rigid partition wall 5 arranged at a higher position than the member 4 divides the interior of the case 1 into two compartments, a lower compartment A and an upper compartment B, and has at least one liquid passage 6 with a small cross section. They are perforated to form individual pieces.

Part of the top of the lower compartment A and the upper compartment B is filled with liquid 7, the top of this compartment B contains a small amount of compressed air, and is separated by a flexible sealing wall 9 from compartment B. Particularly large amounts of compressed air are contained in the chamber 8, which is isolated from the rest of the machine. The member 4 is not provided with the known structure such as a thick ring or a tubular cover (5heath), but here according to the invention, i.e. case 1
It is formed by an annular wall hollowed out towards the inside.

This depression must be sufficiently distinct considering the thickness and nature of the resilient material. This is because when the two rigid parts, the bottom plate 2 and the cover 3, move together with each other in the vertical direction, not only in the vertical direction;
This is because a reduction in the volume of the compartment A occurs in the horizontal direction at the level of the member 4. In other words, such a vertical pull not only results in an expansion of the wall 4, i.e. a horizontal lateral increase in the volume of the compartment A, which at least partially counteracts this volume reduction in the axial direction, but also causes an increase in the volume of the compartment A. The penetration of the resilient wall 4 into the interior of the compartment A, ie the lateral reduction in the volume of the compartment A, reinforces its axial reduction. The overall reduction in volume considered while the bottom plate 2 and the cup 3 are drawn together axially is quite large, resulting in a large amount of liquid passing through the orifice 6. Of course, the bottom plate 2 and the cover 3 move relative to each other in opposite directions (opposite effects are observed between them).

The volume of the problem becomes clear in FIG.

This volume is determined by the length e of the bottom plate 2 and cover 3 in the direction of arrow F.
, - the area Sl around the X axis when they are relatively attracted to each other
This corresponds to the sum of the volumes created by rotating the parts 82 and 82 minus the very small volume created by rotating the area S3 around the same X-axis.

Just like the operating conditions adopted in the preamble and in FIG. 2, in the preferred embodiment the damping device rotates about a vertical axis X and the member 4 is a ring about this axis.

In one half of its axial cross-section, the cross-section of this member 4 has the general shape of a C or semicircle with its axis of symmetry horizontal, the ends of which are probably horizontal over a short distance, as seen in FIG. The extending member 4 has vertically opened ends at both ends in the axial direction. Its vertically extending base 1o is joined to an internal cylindrical area 11 belonging to each of the two parts 2.3.

They preferably form a flat lateral area 12 (the third
(Fig.), are joined to the rings that would otherwise be bent outward from these edges.

This double bond prevents axial and lateral deformations of the elastic material forming the part 4 at this level of fastening and also ensures that the ends of the part 4 are firmly fastened to the two parts 2.3. I'm sure. And with this,
The effect of anchoring or buttressing, which counteracts the natural tendency of the member 4 to expand outwards or bend laterally, which may occur during its axial compression, is particularly effective. to occur.

The resistance to this trend is as shown in Figure 3.
Further reinforcement is provided by providing a certain lateral thickness to member 4.

However, it is said that the above-mentioned anchoring effect or simply anchoring along the expanded edge as shown in Fig. 1 is sufficient to reduce the thickness relatively. I know this from experience.

The shape of the axial end of the member 4 and its mounting position with respect to the corresponding bottom of the compartment A are chosen such that there is no possibility of forming liquid corners at the respective ends of the member 4 and said bottom. This shape advantageously utilizes for this purpose the rounded recessed area indicated by ]3 in FIGS. 1 and 3.

In addition, two threaded heads 14, 15 can be seen in Figure 1, each integral with two parts 2.3, which dampen the relative movement of these parts on two rigid bodies. It is suitable for fixing together with Natsuya (not shown).

The embodiment of FIG. 3 shows in more detail the support of a damping device adapted to a device of the type described above.

Here, the liquid channel 6 is formed by a narrow channel, and the air mass 8 is in direct contact with the free surface of the liquid 7 at the top of the upper compartment. The member 4 of resilient material extends upwardly here by a cylindrical web 16, thereby forming a wall 5, between a central solid body with holes 6 and an outer metal sleeve 170 fitted into this solid body. It acts as a seal. The upper rigid part 3 forming the case 1 is here, in addition to the sleeve 7 and the upper cylindrical extension 18 of the body 5, mounted by screws 21 on the outermost flange 2o of this extension 18. A hat-shaped cover 19 is attached, and here between the cover 19 and the rigid lower disk 22 there is provided a material of rubber or elastic material, which surrounds the whole and whose thickness is the same as that of the cover. A relatively large sleeve 23 is provided which tapers upwardly within the . The lower rigid part 2 forming the case is here formed by a rigid ring 24, in which a plate 26 with a stud 27 in the center having an axially passing through hole 28 is attached to the bottom of the ring 24 by screwing in a screw 25. Fixed. The stud 27 passes with clearance through a hole 29 formed in the disk 22 and is connected to this disk 22 by spot welding after assembly between two rigid bodies whose relative motion is to be damped.

This precaution ensures that the entire weight of the upper rigid element is resiliently supported by the outer sleeve 23, retaining for damping any deformation of the member 4 of elastic material, and that this member 4 never exceeds the said weight. prevent it from working. The ring 24 is a flexible sealing membrane 30 whose deformation is limited to the amplitude direction.
is itself closed by. As is well known, this membrane 30 absorbs relatively small amplitudes and relatively high frequency amplitudes occurring between the two parts 2 and 3. In FIG. 3, it is made of pressed sheet metal, fitted together with the inner cover 19 so as to bear against the flange 2o in the axial direction, the inner side is joined to the upper surface of the outer side of the sleeve 23, and the hole is inserted into the inner cover 19. Cup 31 is slightly bell-shaped and has an inverted cup shape, and Cup 3 faces upward.
A bolt 32 can also be seen passing successively through two vertically aligned holes drilled in the lateral flange of 1 and the horizontal edge of cover 19, respectively.

Whichever embodiment is followed and whichever embodiment is adopted, the damping device ultimately results in a structure and operation that fully complies with those described above.

This damping device has the following advantages compared to conventional ones, in particular that it provides an efficient hydraulic damping action, that the space occupied by the device in the lateral body is reduced, and that the two parts connected together by the device It has a number of advantageous features, such as allowing relative position variations between rigid elements under bending or torsion, not only axially but also transversely at right angles to the axis or circumferentially. have.

An interesting application of the damping device described above is the damping of vibrations experienced by helicopter wings, especially since the overall device occupies a small space. In this case, the two rigid parts 2, 3 of the damping device are fixed respectively to the blade to be damped and to the support of this blade, and the liquid channel 6 is arranged such that the natural frequency of the vibration of the liquid column present in it is the same as the rotation of the blade. It is determined to match the frequency or a high local wave of this frequency.

As is clear and can be seen from the foregoing, the invention is in no way limited to the specifically contemplated embodiments and applications. On the contrary, the invention has all its variations, in particular in that the annular elastic material member is hollowed out rather than by a single ring hollowed out towards the inside of the case with the damping liquid; Consisting of a plurality of rings similar to these, arranged axially in particular at the level of the outer rigid washer, the various rings can have the same or different stiffness, and for this purpose , the rigid parts constituting part of the device casing, made of the same or different materials of the same thickness and/or shape or of different thicknesses and shapes, are not completely indeformable; For example, a damping device that is slightly deformable, formed by walls of thick elastic material and reinforced with other than metal reinforcement; a damping device which is connected between the elements not directly but through an elastic member, in particular an elastic member made of an elastic material, where the annular deformable member of elastic material is itself , a damping device endowed with sufficient elastic resistance to axial compression, such that the damping device can act solely as a resilient strut; an annular deformable The element of elastic material may itself be of natural, synthetic or artificial fibres, glass fibres, etc., having some desirable property, preferably so as to limit the amplitude of the deformation of said element during axial compression. Damping device reinforced by a flexible woven material with non-stretch properties. The woven material is advantageously embedded within the member, said member being made from a woven material that is folded inside the case and is sufficiently impregnated with rubber to provide a seal. The shape of the socks is made within that range.

[Brief explanation of drawings]

FIG. 1 is an axial vertical cross-sectional view of a damping device according to the present invention;
FIG. 2 is an explanatory diagram for the volume change of the compartment, and FIG. 3 is an axial vertical cross-sectional view of the damping device support device. 1... Case 2, 3... Rigid parts 4.
・Elastic material member 5 ・Partition wall 6 ・Passage 7 ・Liquid
8... Chamber 9... Seal wall 10... Dog's foot A...
・First compartment B...Second compartment 22...Rigid body 23...Spring 30...Seal membrane Patent applicant Societe Yuchinson

Claims (1)

[Claims] 1. A hermetically sealed body constituted by two rigid parts that are joined together in a hermetically sealed manner by an annular rubber or elastic material and can each be connected to two rigid elements that damp relative motion. a casing; a partition having a passage therethrough and dividing the interior of the casing into two compartments; and a wall delimiting one of the two compartments and the device in part by a member of resilient material; in a damping device for damping the relative movement of two rigid elements by squeezing the liquid in said passageway, comprising a liquid partially filling a second compartment in contact with an annular elastic material; The member (4) has the shape of a C with half of its axial cross section open towards the outside of the compartment (A), thereby defining the compartment (A) externally, and the symmetry of said C. A damping device characterized in that the axis extends perpendicularly to the axis of said member. 2. Each axial end of the member (4) of elastic material has half of its axial cross-section expanded in the axial direction. The damping device according to claim 1, characterized in that the damping device has the shape of a dog's paw (10).3. Damping device according to claim 1 or 2, characterized in that it is joined to corresponding inner cylindrical regions of opposing rigid parts (2, 3). 4. Resilient material. Claim characterized in that each axial end of the member (4) is joined to a transverse annular flat edge or region (12) of the corresponding rigid part (2, 3). A damping device according to any one of clauses 1 to 3. 5. The member (4) of resilient material is arranged in a corresponding bottom part of the first compartment (A) when the damping device is activated. The attenuation according to any one of claims 1 to 4 is characterized in that it is designed and/or installed so as not to cause liquid corners. Device. 6. Claims characterized in that the member (4) of elastic material is a continuous ring arranged axially at the level of the outer washer of the rigid body and hollowed out towards the inside. 7. The damping device according to any one of claims 1 to 5. Damping device. 8. One of the axial ends of the spring (23) is connected to one of the rigid parts (3) defining the case (1),
Its other axial end is connected to a separate rigid frame (22) of another rigid part (2) defining the case (1), and between these two rigid elements the assembly of the assembly is carried out. The frame (22) of this rigid body and the parts (22) of this rigid body will be attached later.
8. Damping device according to claim 7, characterized in that means are provided for firmly fixing 2) together, in particular by welding. 9. Claims 1 to 8, characterized in that a part of the wall of the first compartment (A) is defined by a flexible sealing membrane (30) whose deformation is limited in amplitude. A damping device according to any of paragraphs.