JPH0511046Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Technical Field) The present invention relates to an atsupa support assembly in a vehicle suspension system, and more particularly to a vibration isolation support device for supporting a shock absorber consisting of a piston and cylinder in a suspension system on a vehicle body. That is, it is related to Atsupa support.

(Prior art) Wheel suspension systems for automobiles, etc. are devices that prevent the impact that the wheels receive from the road surface from being directly transmitted to the vehicle body, and generally consist of springs and shock absorbers, and various suspension systems have been proposed. There is. for example,
A strut-type suspension system is equipped with a shock absorber consisting of a piston and a cylinder, and a coil spring. One end of the piston rod of the shock absorber is fixed to the vehicle body via an upper support, and the cylinder section is connected to a steering knuckle, an arm, etc. It is rotatably attached to the axle via. Further, a coil spring is generally arranged around the outer periphery of the shock absorber.

Such an upper support basically consists of a cylindrical inner member to which the shock absorber piston rod is connected, a generally cylindrical outer member attached to the vehicle body, and a structure located between these two members. and an annular rubber member fixed thereto by vulcanization adhesive etc. ), such a rubber member absorbs vibrations from the wheels that cannot be absorbed by the shock absorber and coil spring, and prevents such vibrations from being transmitted to the vehicle body.

In addition, as a modified example of such Atsupa support, there are
77945, etc., a container-shaped housing is used as the outer member, the annular rubber member is disposed within the housing, and an appropriate stopper means is provided to prevent the rubber member from deforming under heavy loads. A structure designed to do so has also been revealed.

(Problem) By the way, the vibrations transmitted from the piston rod in the vertical direction of the vehicle act as shear stress on the rubber members of the upper support. In addition, in order to ensure the handling stability of the automobile, such an annular rubber member exhibits soft spring characteristics in the axial direction (vehicle vertical direction), while having soft spring characteristics in the axis-perpendicular direction (vehicle longitudinal direction or lateral direction). There is a need for a structure that exhibits hard spring characteristics that does not flex significantly in the direction perpendicular to the axis. There is a limit to increasing the spring constant ratio in the axial direction, and the limit has been to provide a spring characteristic that is two to three times as great at most.

In addition, in conventional Atsupa supports in which a rubber member is vulcanized and bonded between such an inner member and an outer member, it is necessary to add a drawing process to the rubber member in order to improve its durability. However, with conventional Atsupa Support, it is necessary to perform such processing directly on the inner and outer members, which have complex shapes, and therefore, such drawing processing is practically unnecessary. It was impossible. Therefore, even if a metal plate is embedded in the rubber member in order to harden the spring characteristics in the direction perpendicular to the axis of the rubber member in such an Atsupa support, the adhesion between the metal plate and the rubber member will be poor. Therefore, it has been extremely difficult to improve the durability.

In particular, in the Atsupa support structure shown in the above-mentioned Japanese Patent Application Laid-Open No. 58-77945, the outer peripheral edge of a rubber member vulcanized on the inner member is held between a container-shaped housing. Therefore, the relative rotation between the rubber member and the housing is prevented only by the frictional force of the rubber.
Therefore, there is a problem in that it is not possible to sufficiently prevent the rotation between them.In addition, even if the metal plate is embedded in the rubber member, the spring characteristics in the direction perpendicular to the axis can be made hard; In cooperation with the clamping and restraining action of the outer peripheral edge of the rubber member, the spring properties in the axial direction also become stiff as a whole, and eventually the spring properties in the axial direction are sheared, and the spring properties in the direction perpendicular to the axis are reduced. It is difficult to express each of them separately and independently by compression action, and therefore it is not possible to sufficiently increase the spring constant ratio in the axis-perpendicular direction/axial direction. Since it is difficult to apply pre-compression to a vulcanized rubber member, problems arise in the adhesion between the rubber member and the inner member.
This has the inherent problem that cracks are caused in the rubber portion near the tip of the inner member embedded within the rubber member, resulting in reduced durability.

(Solution Means) Here, the present invention was devised to solve such conventional problems, and its feature is that the suspension system for attaching the end of the piston rod of the shock absorber to the vehicle body. The Atsupa support is composed of (a) an upper casing and a lower casing, which are mutually overlapped and connected,
A predetermined internal accommodation space is formed between them;
A container-shaped housing that is attached to the vehicle body side,
(b) A piston rod end portion of the shock absorber, which is disposed within the internal accommodation space of the housing and extends into the internal accommodation space through the lower casing, is connected to the bottom of the cylindrical shape with a bottom. , a first stopper rubber is provided on a surface facing the upper casing of an outward flange formed around the opening of the bottomed cylindrical shape, and a first stopper rubber is provided on a surface facing the lower casing of the bottom of the bottomed cylindrical shape. (c) A prescribed rubber sleeve is integrally vulcanized between an inner casing and an outer casing that are positioned concentrically; An inner sleeve consisting of a body is embedded and arranged concentrically in the rubber sleeve, and is press-fitted between the outer circumferential surface of the inner casing and the inner circumferential surface of the upper casing or the lower casing forming the internal accommodation space of the housing. It was constructed as an assembly so that it included a rubber bushing.

(Function/Effect) As described above, in the present invention, the rubber bush that receives vibrations input from the piston rod of the shock absorber is separate from the container-shaped housing and inner casing that house it, and moreover, It has an assembly structure in which the outer cylinder metal fitting and the inner cylinder metal fitting are press-fitted between them, and the inner sleeve is buried and placed concentrically within the rubber sleeve of the rubber bush. For vibration input in the direction,
As it works in the shear direction, soft spring characteristics are developed, while in the direction perpendicular to the axis, harder spring characteristics are developed because the intersleeve is embedded within the rubber sleeve. Therefore, it is possible to effectively increase the spring constant ratio in the axis-perpendicular direction (front-rear direction or left-right direction)/in the axial direction (up-down direction), and it is also possible to provide an atsupa support that has about 5 times the spring constant ratio. It was summer.

In addition, such a rubber bush has a plurality of divided intersleeves within the rubber sleeve constituting it, and an inner cylinder metal fitting and an outer cylinder metal fitting are provided on the inside and outside of the rubber bushing, respectively. By simply performing a drawing operation on the inner cylinder of such a rubber bush, it is possible to apply an effective drawing process to the entire rubber bush, thereby effectively increasing the durability of the rubber sleeve and, by extension, the rubber bush. The metal fittings and outer cylindrical fittings are press-fitted into the outer circumferential surface of the inner casing and the inner circumferential surface of the housing, respectively.
Because they are assembled together, relative rotation between the inner casing, bushing, and housing can be effectively prevented. Further, in the atsupa support assembly according to the present invention, a first stopper rubber and a second stopper rubber are provided on the upper outward flange portion of the inner casing and the bottom surface of the lower part, respectively, and the upper part forming the container-shaped housing. A structure that can be brought into contact with the casing or lower casing, and exhibits spring characteristics that do not bend significantly under heavy loads in the vertical direction.
In other words, since the structure exhibits nonlinear spring characteristics, the ride comfort of the automobile is effectively improved.

Furthermore, in this invention, since the rubber bushing is separate from the inner casing and housing, by preparing various bushings with different spring characteristics, the spring constant ratio in the axis-perpendicular direction/axial direction can be adjusted. It has the characteristic that different kinds of Atsupa supports can be easily obtained.

(Example) Hereinafter, in order to clarify the configuration of the present invention more specifically, an example of the present invention will be described in detail based on the drawings.

First, in FIGS. 1 and 2, the Atsupa support assembly 10 according to the present invention includes a housing 12 in the shape of a container, and an inner casing 14 in the shape of a cylinder with a bottom, housed and arranged inside the housing 12. and a rubber bushing 16 press-fitted between the housing 12 and the inner casing 14.

More specifically, the housing 12 includes a metal upper casing 20 each shaped like a shallow pot.
and a lower casing 22, which are overlapped so that their openings face each other, and whose flanges are integrally joined by projection welding or the like, so that it can be sandwiched between the casings. A predetermined accommodation space 24 is formed between them. In addition, a large diameter opening 2 is provided in the center of the upper casing 20.
6 is provided, and an opening 28 is also provided in the center of the lower casing 22 so that the tip of the piston rod 30 of the shock absorber passes through the opening 28 and enters the accommodation space 24 of the housing 12. It has become possible for them to be forced into it. The housing 12 formed by combining these two casings 20 and 22 is fixed to a predetermined member on the vehicle body side by means of a mounting bolt 32 attached to the flange portion of the housing 12. A resin bearing 34 is disposed around the opening 28 of the shock absorber, and a spring seat 38 rotatable by the bearing 34 receives a coil spring 36 of the shock absorber.

In addition, the inner casing 14 is
As is clear from the figures, FIG. 4, etc., the casing body 40 has a cylindrical shape with a bottom and is relatively low in height, and around the opening of the casing body 40,
A mounting hole 44 is formed in the center of the bottom of the casing body 40, while an outward flange portion 42 extending laterally is formed. As shown in FIG. 1, the end of the piston rod 30 can be inserted into the mounting hole 44 and fixed with a bolt 46 or the like.

Furthermore, on the outer surface of the outward flange portion 42 of the casing body 40 of the inner casing 10,
A base rubber layer 48 of a predetermined thickness constituting the first stopper rubber 47 is provided over its entire circumference by integral vulcanization molding or the like. Further, on the upper surface of this annular base rubber layer 48, as shown in FIGS. 3 to 5, a large number of small protrusions 50 are arranged at predetermined intervals in the circumferential direction. Notches 52 are provided between the protrusions 50, and the small protrusions 50 and the notches 52 are arranged in a circular pattern on the upper surface of the base rubber layer 48, with the small protrusions 50 and the notches 52 being alternately positioned. . In short, by providing the small protrusions 50 and the notches 52 in the base rubber layer 48, the first stopper rubber 47 formed on the outer surface of the flange portion 42 is configured with three levels of height. As shown in FIG. 1, the vibration load can be sequentially brought into contact with the inner surface of the upper casing 20 depending on the magnitude of the vibration load.

Similarly, a second stopper rubber 54 having a similar structure is provided on the outer surface of the bottom of the casing body 40 of the inner casing 14, in other words, on the surface facing the lower casing 22. The stopper rubber 54 is also shown in FIGS.
As shown in FIG. 9, an annular base rubber layer 56 with a predetermined thickness extending in the circumferential direction and this base rubber layer 5
Small protrusions 5 located in an annular shape alternately formed in 6
8 and a notch 60, and has three levels of height, and can be brought into contact with the inner surface of the lower casing 22 in sequence according to the vibration load, as shown in FIG. It's becoming like that.

The second stopper rubber 54 has a hole 6 passing through the bottom of the casing body 40 with respect to a rubber layer that integrally extends from the first stopper rubber 47 to the entire inner peripheral surface of the casing body 40.
2, and are integrally connected and formed by vulcanization molding operation or the like.

Furthermore, as shown in FIGS. 10 and 11, the rubber bushing 16 is formed by integrally vulcanizing and molding a predetermined rubber material between an inner cylindrical metal fitting 64 and an outer cylindrical metal fitting on the outside thereof, which are positioned concentrically. The inner sleeve 70 is composed of two metal parts 70a and 70b that are arranged when the rubber sleeve 68 is integrally vulcanized. 68 are buried and arranged concentrically in the circumferential direction. Furthermore, the divided body 70a exhibiting this approximately semi-cylindrical shape,
As shown in FIG. 10, a predetermined space 72 is provided between the circumferential ends of 70b.

By the way, when assembling the upper support assembly 10 as shown in FIG. 1 by combining the housing 12, inner casing 14, and rubber bushing 16, first, as shown in FIG. 2
2 and the outer circumferential surface of the casing body 40 of the inner casing 14, the rubber bush 16 is press-fitted via the outer circumferential metal fitting 66 and the inner circumferential metal fitting 64, and then the upper casing 20 of the inner casing 14 is inserted. They are completed by stacking them on top of each other and integrally fixing them by welding or the like.

Therefore, in the upper support assembly 10 having such a structure, the piston rod 30 of the shock absorber
The vibration load applied in the axial direction from the housing 12
The vibration load in the direction perpendicular to the axis is absorbed or blocked as shear deformation of the rubber bush 16, more precisely, the rubber sleeve 68, which is press-fitted between the inner casing 14 and the rubber sleeve 68. However, since an inner sleeve 70 composed of a pair of divided bodies 70a and 70b is embedded and arranged in the rubber sleeve 68 of the rubber bush 16, the rubber sleeve 68 of the rubber bush 16 is
The spring characteristics (rigidity) in the direction perpendicular to the axis of No. 8 are effectively increased, thereby effectively increasing the spring constant ratio in the vehicle longitudinal direction or left-right direction (direction perpendicular to the axis)/vehicle vertical direction (axial direction). As a result, it has become possible to realize a support assembly that is five times as large, for example, and can greatly contribute to the handling stability of the vehicle. By preparing such rubber bushes 16 with various spring characteristics, the spring constant ratio of the vehicle in the longitudinal direction or in the horizontal direction (direction perpendicular to the axis)/in the vertical direction (axial direction) of the vehicle can be adjusted. Different types of atspa support assemblies can be easily obtained.

Moreover, the rubber bushing 16 that can exhibit such great rigidity in the direction perpendicular to the axis has an inner cylindrical metal fitting 64 and an outer cylindrical metal fitting 66 disposed on its inner and outer surfaces, respectively, and an inner sleeve 70 embedded in the rubber sleeve 68. are formed into divided bodies 70a and 70b, and therefore, by simply squeezing the outer cylinder fitting 66, the rubber portions located on the outside and inside of the inner sleeve 70 are subjected to an effective squeezing action, and the rubber The durability of the connecting surface of the sleeve 68 can be significantly improved, and the life span of the upper support assembly 10 can also be effectively improved. In particular, in this embodiment, since a predetermined space 72 is formed between the circumferential ends of the divided bodies 70a and 70b of the inner sleeve 70, the above-described throttling operation on the outer cylindrical fitting 66 is effective. There are advantages to being able to do so.

In addition, the inner casing 14 is provided with a first stopper rubber 47 and a second stopper rubber 54, which can abut against the inner surfaces of the upper casing 20 and lower casing 22 of the housing 12, respectively. When an excessive vibration load is applied in the bounce direction or rebound direction, such stopper means 47,
54 effectively prevents excessive deformation of the rubber bush 16. Moreover, such stopper rubbers 47 and 54 each have a three-stage structure, and each casing 2
0, 22 in three stages, each stopper rubber 47, 54 gradually deforms depending on the magnitude of the applied vibration load, and its predetermined portions, that is, the small protrusions 50, 58 ,
The Atsupa support assembly 10 is in full contact with the upper surface portions of the base rubber layers 48, 56 and further with the bottoms of the notches 52, 60 of the base rubber layers 48, 56. Overall, the load-deflection curve does not form a sharp bending point, smoothly transitions from soft spring characteristics to hard spring characteristics, and exhibits even better nonlinear spring characteristics.

Furthermore, the upper support assembly 10 having the above-mentioned structure can be assembled by simply press-fitting the rubber bush 16 into the housing 12 and the inner casing 14, so that the assembly work can be significantly simplified. Yes, and with such a press-fit structure, the rubber button 1
6, the housing 12, and the inner casing 14. In addition, the inner casing 14 attached to the tip of the piston rod 30 of the shock absorber,
The rubber bushing 16 that supports it in vibration isolation is disposed within the accommodation space 24 of the housing 12, and the structure is such that it cannot escape from the accommodation space 24 as it is, so it can also advantageously exhibit a fail-safe function. be.

Although one embodiment of the present invention has been described above, the present invention is not to be construed as being limited to such embodiment, and as long as it does not deviate from the spirit of the present invention, Various changes, modifications, etc. can be made as appropriate based on the above, and it goes without saying that the present invention includes such embodiments.

For example, the upper support assembly according to the present invention can be advantageously used in suspension systems for both front and rear wheels of automobiles, and also uses a shock absorber to secure the piston rod to the vehicle body. The present invention can be applied to any type of suspension device, without being limited to a strut type suspension device.

Furthermore, regarding the shapes of the upper casing and the lower casing that constitute the container-shaped housing, not only the upper casing and the lower casing have the shape of a shallow pot as shown in the example, but also the lower casing 22 as shown in FIG. There is no problem even if it has a flat plate shape as a whole; in short, the upper casing 2
0 and the lower casing 22, as long as a predetermined internal storage space is formed between them and the container is shaped like a container, any shape may be used. Then, according to the shape of the casings 20 and 22, the rubber button 16 is
is press-fitted into either side of the casing; for example, in the example shown in FIG. 1, it is press-fitted into the inner surface of the lower casing 22, and in the example shown in FIG. In this case, the structure is such that it is press-fitted into the inner surface of the upper casing 20.

Furthermore, the rubber sleeve 68 of the rubber bush 16
The inner sleeve 70 to be embedded in the inner sleeve 70 may have not only a pair of substantially semi-cylindrical divided bodies as in the above example, but also three or more divided bodies.

Furthermore, regarding the structure of the first and second stopper rubbers 47, 54 as stopper means in the bounce direction and rebound direction, the structure as exemplified above is the most preferable, but instead of this, Those without small protrusions 50, 58 or notches 52, 60, or those without the base rubber layers 48, 56 as appropriate.
or just a small protrusion 50,
In various embodiments such as when only 58 is provided,
It is possible to implement it.

[Brief explanation of the drawing]

FIG. 1 is an explanatory cross-sectional view of an Atsupa support assembly according to an embodiment of the present invention, which corresponds to the - section in FIG. 2; FIG. 3 is a plan view of the inner casing, FIGS. 4 to 6 are a -sectional view, -sectional view, and -sectional view of FIG. 3, respectively, and FIG. 7 is a plan view of the inner casing. It is a bottom view of the inner casing,
8 and 9 are a sectional view and a sectional view of FIG. 7, respectively. FIG. 10 is a plan view of the rubber bushing used in the upper support assembly of FIG. 1, and FIG. 11 is a cross-sectional view taken from FIG. 10. FIG. 12 is a sectional view for explaining the assembly process of the upper support assembly of FIG. 1. FIG. 13 is an explanatory cross-sectional view corresponding to FIG. 1 showing another embodiment of the present invention. 10...Atsupa support assembly, 12...Housing, 14...Inner casing, 16...Rubber bushing, 20...Upper casing, 22...
Lower casing, 24... Housing space, 30... Piston rod, 40... Casing body, 42...
...Outward flange portion, 44...Mounting hole, 47...First stopper rubber, 54...Second stopper rubber, 48, 56...Base rubber layer, 50, 58...
...Small protrusion, 52, 60... Notch, 64... Inner tube fitting, 66... Outer tube fitting, 68... Rubber sleeve, 70... Inner sleeve, 70a, 7b...
Divided body, 72...space.

Claims (1)

[Claims for Utility Model Registration] (1) An upper support assembly in a suspension system for attaching the piston rod end of a shock absorber to a vehicle body, consisting of an upper casing and a lower casing, which are overlapped and connected to each other. a container-shaped housing attached to the vehicle body side, between which a predetermined internal storage space is formed; A groove is formed on a surface facing the upper casing of an outward flange formed around the bottomed cylindrical opening to which the piston rod end of the shock absorber that penetrates the casing and protrudes into the internal housing space is connected. an inner casing having a first stopper rubber and a second stopper rubber provided on a surface of the bottom of the bottomed cylindrical shape facing the lower casing; an inner cylindrical fitting and an outer cylindrical fitting that are concentrically positioned A predetermined rubber sleeve is integrally vulcanized in between, and an inner sleeve consisting of a plurality of divided bodies is embedded concentrically in the rubber sleeve,
A suspension system comprising: a rubber bushing press-fitted between the outer circumferential surface of the inner casing and the inner circumferential surface of an upper casing or a lower casing forming an internal accommodation space of the housing. Atsupa support assembly. (2) The inner sleeve embedded in the rubber sleeve of the rubber bush is composed of a pair of substantially semi-cylindrical divided bodies, and the pair of divided bodies are arranged in a cylindrical shape within the rubber sleeve,
The upper support assembly according to claim 1, wherein a predetermined space is provided between the circumferential ends of the pair of divided bodies. (3) The utility model according to claim 1 or 2, wherein the first stopper rubber includes a plurality of protrusions provided at predetermined intervals in the circumferential direction of the outward flange portion of the inner casing. Atsupa support assembly. (4) The first stopper rubber includes a base rubber layer formed at a predetermined thickness in the circumferential direction on the outer surface of the outward flange portion of the inner casing, and provided on the base rubber layer at predetermined intervals in the circumferential direction. 2. The support assembly according to claim 1 or 2, which comprises a plurality of protrusions that are attached to each other. (5) The second stopper rubber includes a plurality of protrusions provided at predetermined intervals in the circumferential direction on the outer surface of the bottom of the inner casing. Atsupa support assembly described in any of the above. (6) The second stopper rubber includes an annular base rubber layer formed to a predetermined thickness in the circumferential direction on the outer surface of the bottom of the inner casing, and provided on the base rubber layer at predetermined intervals in the circumferential direction. Claim 1 for utility model registration consisting of multiple protrusions
The atsupa support assembly according to any one of items 1 to 5.