FR2833558A1 - Liquid-filled mount for supporting vehicle body to vehicle frame, has slanting end walls provided to liquid chambers and integrally formed to elastic body - Google Patents

Abstract

The mount has an elastic body (3) set between an inner cylinder (1) and an outer cylinder (2). An orifice path (6) and liquid chambers (4a,4b) are formed between the elastic body and the outer cylinder. The liquid chambers have diagonal end walls (40a,40b) integrally formed to the elastic body.

Description

<Desc / Clms Page number 1>

 The present invention relates to a liquid-tight type body support arranged between a vehicle body and a chassis on a support side, such as a suspension or the like, for supporting the body in an anti-vibration manner.

 Hitherto, a body support is known which is used in a rear suspension of a vehicle such as an automobile, in which an internal cylinder is provided coupled to the body of the vehicle or to the chassis on the suspension side intended to support this body. , and an outer cylinder coupled to the other of these elements, these inner and outer cylinders being connected to each other by means of a rubber elastomer disposed between them. Two liquid chambers, which are formed in opposite parts to each other by having the inner cylinder located therebetween, are arranged between the inner and outer cylinders, and these liquid chambers are brought into communication with each other. one with the other via a passage forming an orifice to obtain a vibration damping effect by a liquid flow effect between the two chambers (see for example the Japanese patents filed with the Public Inspection No Hei 2-38 730 and Sho 62-188 832).

 However, in this usual type of body support, a rubber part, forming an end wall in the axial direction of the liquid chamber mentioned above, generally forms a right angle with respect to the central axis.

 In the case where such a support is used having the above-mentioned liquid chambers positioned in the front and rear directions of the vehicle, an anti-vibration characteristic which is stable to a certain extent in the upward and downward directions is obtained. when the load of the coach applies-

<Desc / Clms Page number 2>

 due to a decrease effect of the elastic constant. However, in the front and rear directions where large vibrations are applied during acceleration, such as when starting, or when braking, the vibration damping effect becomes weak, due to made of the stiffness of the rubber part of the end wall of the liquid chamber. For example, in a case where the attenuation coefficient, the frequency being 15 Hz is established at approximately 4 N's / mm, the elastic constant at approximately 100 Hz becomes 2000 N / mm and more, so that the anti- sufficient vibration does not work. Therefore, further improvement is desired.

 The object of the present invention is to provide a body support of the liquid-tight type, in which, considering the vibrations mainly in the front and rear directions, in the case for example where the attenuation coefficient at a frequency of 15 Hz is set at around 4 N's / mm, the elastic constant at around 100 Hz can be reduced to as low as around 1000 N / mm, so that a sufficient anti-vibration characteristic can be obtained.

 The present invention relates to a liquid-tight type body support arranged between a vehicle body and a chassis on a support side, for supporting the body in an anti-vibration manner. The body support comprises an internal cylinder fixed on the body or the chassis, an external cylinder fixed on the other of these elements, a rubber elastomer disposed between these internal and external cylinders, and which connects them to each other , two liquid chambers, which are formed in parts of this rubber elastomer opposite one another with the inner cylinder located between them, and

<Desc / Clms Page number 3>

 formed between the inner and outer cylinders, and a passage forming an orifice for placing these liquid chambers in communication with one another. In addition, in the body support in which the load entry of the body is made in the axial direction, end walls are formed in the axial direction of the liquid chambers, of a rubber film which is a part of the rubber elastomer mentioned above, and the rubber film is obliquely formed from the inner cylinder side towards the outer cylinder, i.e. outward in the axial direction.

 In this body support, when the vibrational energy perpendicular to the central axis acts in the two opposite directions of the liquid chambers, since the rubber films which constitute the end walls in the axial direction of the liquid chambers are formed obliquely, vibrations can be effectively absorbed by the action of these rubber films. For example, at the frequency of 15 Hz, in a case where the vibration coefficient is approximately 4 N's / mm, the elastic constant can be reduced to approximately 1000 N / mm. Therefore, by using this body support having the liquid chambers positioned in the front and rear directions of the vehicle, one can obtain a good anti-vibration characteristic with regard to vibrations in the front and rear directions, and obliquely in the front and back directions.

 In said body support mentioned above, it is particularly preferred that the angle of inclination of the end wall made of the rubber film with respect to the central axis is between 150 and 70.

<Desc / Clms Page number 4>

 Thus in the case where the angle of inclination is above or below the range mentioned above, the rigidity balance is lost respectively in the direction perpendicular to the axis and in the axial direction, and it there is a bad influence on the transmission of vibrations in each direction. Therefore, it is preferable to set the tilt angle in the above mentioned range, more preferably in the range from 300 to 600.

 In the liquid-tight type body support mentioned above, the end walls made of rubber films can extend from the inner cylinder side in the radial direction almost in a wavy form, and the more the walls ends are close to the outer cylinder, the more they can expand outward in the axial direction. In this case, similarly to the above, the elastic constant can be reduced, and in addition the free length of the rubber film extends to thereby improve durability.

 In addition, it is preferred that the thickness of the end wall made of the rubber film is 2 to 6 mm. Thus in the case where the thickness of the end wall of the rubber film is thin, the efficiency of the liquid pressure transmission decreases, so that the effect of liquid tight seal is difficult to produce. In addition, in the case where the rubber film is too thick, the rigidity of the rubber part increases, and the transmission of vibrations at the liquid pressure decreases, so that the effect of liquid tight seal is difficult to produce.

 In addition, it is preferred that a stopper extruded from the inner cylinder in the radial direction is arranged in the two liquid chambers, and that by

<Desc / Clms Page number 5>

 by means of this stopper, it is possible to prevent a greater displacement than the predetermined displacement.

 In particular, it is preferred that the stopper is formed by coating a metal part fixed to the inner cylinder in a rubber part formed in one piece with the rubber elastomer, since the impact can be mitigated when the stopper acts.

liquide ne soit pas inférieur à 60 et pas supérieur à 140 , puisqu'on peut faire en sorte que la surface de la paroi d'extrémité axiale du film de caoutchouc soit grande, et que la durabilité puisse être améliorée. It is particularly preferred that the opening angle in the circumferential direction of the chamber

liquid is not less than 60 and not more than 140, since the area of the axial end wall of the rubber film can be made large, and durability can be improved.

 Now, we will describe preferred embodiments of the present invention with reference to the embodiments shown in the drawings, in which: - Figure 1 is a view in longitudinal section along XY of Figure 2, a first embodiment of a body support according to the present invention, - Figure 2 is a sectional view along Xl-Xl of Figure 1, - Figure 3 is a side view partially cut away thereof in a state where an outer cylinder is separated from an inner cylinder, - Figure 4 is a side view in longitudinal section, with the exception of the outer cylinder, - Figure 5 is a sectional view along X2-X2 in Figure 4 , - Figure 6 is a sectional view along X3-X3 of Figure 5, - Figure 7 is a bottom view of it with the exception of the outer cylinder,

<Desc / Clms Page number 6>

 - Figure 8 is a longitudinal sectional view, with the exception of an outer cylinder, of a second embodiment of the present invention, - Figure 9 is a cross-sectional view thereof, including the outer cylinder, and FIG. 10 is a view in longitudinal section of the state of fixing of the body support of FIG. 8.

 In the figures, the reference numeral 1 indicates an inner cylinder coupled to a body of a vehicle, and fixed thereto by means of a fastening element 100, such as a body support, which is formed in the form of a comparatively thick cylinder and fixed to the fixing element 100 by means of a clamping element 101 such as a bolt. The reference numeral 2 indicates an external cylinder, which is connected to an annular fastening element 103 of a chassis 102 and fixed thereon by means of a layer of rubber 104 on a support side such as a suspension, to support the body by thrust means, and which is almost concentric with respect to the inner cylinder 1. These inner and outer cylinders 1 and 2 are usually made of metal, such as aluminum, steel or the like.

 The reference numeral 3 indicates a rubber elastomer disposed between the inner cylinder 1 and the outer cylinder 2. Two liquid chambers 4a, 4b which are formed between the inner and outer cylinders 1 and 2, and which are open towards the periphery, are arranged in parts of this rubber elastomer 3 opposite to each other (symmetrical positions) with the inner cylinder 1 located between them. These liquid chambers 4a, 4b are placed in communication with each other via a passage forming an orifice 6 which will be described later.

<Desc / Clms Page number 7>

 In the rubber elastomer 3, its inner part is adhered by vulcanization on the inner cylinder 1, and as regards its outer part, a middle cylinder 5 arranged inside the outer cylinder 2 is adhered by vulcanization. This middle cylinder 5 has a rim portion 51 directed outwards on the lower end side, and window-like openings 5a, 5b situated in its parts which correspond to the two liquid chambers 4a, 4b. And, on the peripheral surface of this central cylinder 5, there is provided a layer of rubber 31 intended for a seal which is formed in a single block with the rubber elastomer 3. A convex rib 32 is provided at level d part of the rubber layer 31, and this middle cylinder 5 is arranged in an airtight manner in the outer cylinder 2 by means of the rubber layer 31 and the convex rib 32, so that the The rubber elastomer 3 is disposed between the inner cylinder 1 and the outer cylinder 2, and the liquid chambers 4a, 4b are formed, in which the liquid is sealed. The above-mentioned outer cylinder 2 is crimped in a state where a flange 21 located at a lower end part thereof is arranged on the flange part 51 of the middle cylinder 5.

 In addition, at the peripheral part of the middle cylinder 5, there is provided a groove forming a recess 6a extending in the circumferential direction between the openings 5a and 5b. By arranging the outer cylinder 2 on the outside of the middle cylinder 5, the recess-forming groove 6a acts as a passage forming an orifice 6 to put the liquid chambers 4a and 4b in communication with each other.

 Each opening angle 0 in the circumferential direction of the two liquid chambers 4a and 4b,

<Desc / Clms Page number 8>

 that is to say an opening angle o of the liquid chamber defined by the openings 5a and 5b of the middle cylinder, can be established as desired according to the characteristics. However, it is usually set in a range where it is not less than 600 and not more than 140. For this purpose, the opening angle 0 is around 70 in this embodiment. From the standpoint of durability and so on, 800 or more is preferred.

 The reference numeral 7 indicates a stop which projects into the two liquid chambers 4a and 4b from the inner cylinder 1 in the radial direction.

When a large displacement occurs in the projecting direction of the stopper 7, the stopper comes into contact with the chamber wall surface opposite to the stopper, i.e. the inner surface of the outer cylinder 2, so that 'a larger displacement is ordered. The stopper 7 is protruding, so that its leading end surface has a small space with respect to the chamber wall surface on the peripheral side of the liquid chamber, or comes into slight contact with the surface of chamber wall. The space between its leading end surface and the chamber wall surface is set, for example, to about 1 mm or less. For example, the aforementioned leading end surface may come into slight contact with the chamber wall surface. In addition, there is also an effect due to the fact that the space between its leading end surface and the chamber wall surface gives resistance to liquid flow at the time of vertical (axial) vibrations. .

 The stopper 7 is usually formed, as shown in the figures, by coating a metal part 71 fixed on the outer cylinder 1 in a rubber part 72 formed in one piece with the elastomer

<Desc / Clms Page number 9>

 rubber 3, so that the contact of the stopper 7 with the chamber wall surface mentioned above is made resiliently. Setting the circumferential width of this stopper 7, including the metal part 71, @ so that it is large can prevent excessive deformation, and increase durability.

 In the body support having the constitution mentioned above, the two end walls 40a, 4la; 40b, 41b in the axial direction of the two liquid chambers 4a, 4b consist of a rubber film formed integrally with the rubber elastomer 3, and having a predetermined thickness, and the rubber film is inclined from from the inner cylinder 1 to the outer cylinder 2 outward in the axial direction, extends almost in a straight line, and is coupled to the outer cylinder 2. Thus, as a whole, the liquid chambers 4a, 4b have a section longitudinal almost in the shape of a Y on the periphery side.

 The angle of inclination of each of the end walls 40a, 4la; 40b, 41b made of the rubber film with respect to the central axis is established in a range from 15 to 70, preferably in a range from 300 to 600. In addition, the thickness of each of the end walls 40a, 41a; 40b, 41b consisting of the rubber film is established in a range from 2 to 6 mm.

 In addition, the two end surfaces, in the axial direction of the rubber elastomer 3 between the two liquid chambers 4a and 4b, are not limited to linearly inclined surfaces like the outer surfaces of the end walls. 40a, 4la; 40b, 41b, made of the rubber film, or the corrugated inclined surface. In particular, the axial end surfaces of the rubber elastomer 3 on the bottom side

<Desc / Clms Page number 10>

 may be concave surfaces such that they form the inclined surfaces inverted with respect to the inclined surfaces of the end walls 41a, 41b, as shown in FIG. 5. The reference numeral 33a indicates its concave part.

 In addition, on the lower surface of the rim portion 51 of the middle cylinder 5, a rubber forming a stopper 81 formed in a single block with the rubber elastomer 3 is arranged by means of adhesion by vulcanization to control the greater displacement. that the predetermined displacement, by bringing a mounting plate 82 fixed on the lower end of the inner cylinder 1 in contact with the rubber forming a stopper 81 resiliently when the inner cylinder 1 moves significantly upwards due to the vibrations of the body. In addition, in the state of fixing of FIG. 1, on the inner cylinder 1 towards the top of the fixing element 103 of the chassis 102, is arranged a stopper element 85, in which is mounted a rubber forming a stopper 84 provided for annular metal parts 83, and the lower surface of the fastening element 100 comes into contact with the stopper element 85 resiliently when the body is moved downward, so as to control the movement more important than the predetermined displacement.

 The liquid-tight type body support of the present invention is used in a rear suspension or the like of a vehicle such as an automobile, as shown in FIG. 1, so that the inner cylinder 1 is fixed on the fixing element 100 on the body side via the clamping element 101, such as a bolt, and the outer cylinder 2 is pushed into the fixing hole 103 of the fixing element 102 on the

<Desc / Clms Page number 11>

 chassis side of the suspension, so as to be fixed. In particular, in this case, the body support is fixed so that each of the liquid chambers 4a and 4b is positioned in the front and rear directions of the vehicle.

 In the above-mentioned use of body support, the elastic constant can be reduced in the vertical direction where the load of the body is applied. In addition, also in the front and rear directions perpendicular to the central axis and obliquely in the front and rear directions, when significant vibrations are applied during acceleration, such as when starting the vehicle, or when moment of braking, since the rubber films which form the end walls 40a, 41a; 40b, 41b in the axial direction of the liquid chambers 4a, 4b are formed obliquely, the rigidity with respect to vibrations in the directions mentioned above and the elasticity become smaller than in the case of the rubber film perpendicular to the central axis, so that the elastic constant is reduced by the effect of this rubber film, which increases the vibration damping effect in cooperation with the liquid flow effect between the two liquid chambers 4a and 4b.

 For example, at a frequency of 15 Hz, in the case of a damping coefficient of approximately 4 Ns / mm, the elastic constant can be reduced to approximately 100 Hz to a value as low as approximately 1000 N / mm. Thus, a good anti-vibration characteristic can be obtained with regard to vibrations in the front and rear directions, and obliquely in the front and rear directions.

 FIGS. 8 to 10 show a second embodiment of the present invention in which,

<Desc / Clms Page number 12>

 since its basic constitution is common to that of the above embodiment, the same components are designated by the same reference numerals, and their detailed description will not be made.

 In this embodiment, the two end walls 40a, 41a; 40b, 41b made of a rubber elastomer 3 in the axial direction of the two liquid chambers 4a and 4b opposite to each other by having an inner cylinder 1 situated between them, extending from the side of the inner cylinder 1 in the radial direction, so as to form an almost wavy shape having continuously curved surfaces having alternating reverse curvatures. The closer the end wall is to the side of the outer cylinder 2, the more it expands outward in the axial direction. In this case, it is preferable that the angle of inclination of a line connecting junctions at which each of the end walls 40a, 41a; 40b, 41b meets the inner cylinder 1 or the outer cylinder 2 relative to the central axis is established in a range similar to that of the first embodiment above. It is also preferred to establish the thickness of the end wall in a similar manner.

 In the case where the end walls 40a, 41a; 40b, 41b are formed almost in a corrugated shape as in this embodiment, since the free length of a rubber film forming the end wall is extended, which is different from the case where the end walls are extend obliquely in a straight line or in a slightly curved manner as shown in Figures 1 to 7, one can reduce the stress at the time of deformation, and improve durability.

 In addition, in the case of the embodiment shown in Figures 8 to 10, we establish large

<Desc / Clms Page number 13>

 opening angles o in the circumferential direction of the two liquid chambers 4a, 4b, from about 90 to about 1000. By thus establishing a large opening angle 0, preferably 800 and more, the surfaces of the rubber films end walls 40a, 41a; 40b, 41b in the axial direction of the liquid chambers are made large, so that durability can be further improved.

 In addition, in this embodiment, with regard to the stopper 7 projecting from the inner cylinder 1 in the radial direction, a large metallic inner part 71 and a large outer rubber part 72 are made in their circumferential width, so that we can improve durability.

 In this second embodiment also, by fixing the body support as shown in FIG. 10 and using it in a similar manner to the first embodiment, thanks to the effect of the rubber films forming the respective end walls. 40a, 4la; 40b, 41b in the axial direction of the two liquid chambers 4a, 4b, the elastic constant can be reduced, and the vibration damping effect can also be increased in cooperation with the liquid flow effect between the chambers liquid 4a and 4b. In addition, since the rubber film forming the above-mentioned end wall is formed almost in a wavy shape, since the free length of the rubber film is long, and since the surface of the rubber film is large, it can be also improve durability significantly.

 For example, in the case of a bench test, in correspondence with an actual car movement, between the body support of the second embodiment, in which the end wall in the axial direction of the liquid chamber is formed

<Desc / Clms Page number 14>

 almost in a wavy form, and the body support of the first embodiment in which the end wall is formed in a linear fashion, it has been found that the body support of the second embodiment has a service life of four or more times four times greater than that of the body support of the first embodiment.

 As described above, with the liquid tight type body support of the present invention, using it having the central axis positioned in the vertical direction and having the two liquid chambers positioned in the forward direction and in the rear direction of the vehicle, in the front and rear directions where significant vibrations apply during acceleration, such as when starting the vehicle, or when braking, the elastic constant can be reduced to about 100 Hz up to around 1000 N / mm, even if the damping coefficient is set at 4 N. s! mm, the frequency being 15 Hz, so that a vibration damping effect and an important anti-vibration characteristic can be obtained. In particular, in the case where the rubber film which forms the end wall in the axial direction of the liquid chamber is formed almost in a wavy shape, one can also improve the durability.

Claims (7)

1. Liquid-tight type body support comprising an internal cylinder (1) fixed to a vehicle body or a chassis on the support side, an external cylinder (2) fixed to the other of these elements, a rubber elastomer (3) which is arranged between these inner and outer cylinders and which couples them to one another in an elastic manner, two liquid chambers (4a, 4b) which are formed at the level of parts of this rubber elastomer opposite the one to the other having the inner cylinder situated between them, and formed between the inner and outer cylinders, and a passage forming an orifice (6) for placing these liquid chambers in communication with each other, the charge of the bodywork being applied in the axial direction, characterized in that: end walls (40a, 41a; 40b, 41b) in the axial direction of said liquid chambers are formed of a rubber film which forms a part said rubber elastomer (3), and the rubber film is formed obliquely and outward in the axial direction from the side of the inner cylinder (1) toward the outer cylinder (2).  2. Liquid-tight type body support according to claim 1, characterized in that the angle of inclination of the end wall made of the rubber film with respect to the central axis is between 150 and 700.  3. Liquid-tight type body support according to claim 1, characterized in that the end wall made of the rubber film extends from the side of the inner cylinder almost in a corrugated shape, and more the wall d The end is closer to the side of the outer cylinder, the more it expands outward in the axial direction. <Desc / Clms Page number 16>  4. Liquid-tight type body support according to any one of claims 1 to 3, characterized in that the thickness of the end walls made of the rubber film is between 2 and 6 mm.  5. Liquid-tight type body support according to any one of claims 1 to 3, characterized in that buffers (7) projecting from the inner cylinder (1) in the radial direction are arranged in said two chambers liquid (4a, 4b).  6. Liquid-tight type body support according to claim 5, characterized in that the stopper (7) is formed by coating a metal part (71) fixed on the inner cylinder (1) in a rubber part (72) formed in a single block with the rubber elastomer (3).  7. Liquid-tight type body support according to any one of claims 1 to 3, characterized in that the opening angle in the circumferential direction of said liquid chamber is not less than 600, and n 'is not greater than 140.