JPH0437302B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a strut mount insulator disposed at a mounting portion of a strut suspension of an automobile on the vehicle body side.

BACKGROUND TECHNOLOGY As is well known, various types of strut mount insulators are available for use in strut suspensions of small cars, etc. Among these, there are many types of strut mount insulators used for strut suspensions such as small cars. There is a structure in which a coil spring is brought into direct elastic contact with the vehicle body so that the load of the coil spring system is directly borne by the vehicle body.

FIG. 5 shows an example of this. Reference numerals 1 and 2 indicate a strut rod and a coil spring that constitute a strut suspension. It is in elastic contact with the bottom surface of. Reference numeral 6 designates a box portion formed in the vehicle body panel 5 at a location where the strut rod 1 is attached, and a through hole 7 for the strut rod 1 is formed in the upper and lower surfaces thereof. Reference numeral 8 designates a strut mount insulator which is fixed to the upper end of the strut rod 1 with a nut 9 and housed in the box portion 6 to substantially connect the upper end of the strut rod 1 to the vehicle body panel 5. This strut mount insulator 8 has a mounting hole 10 in the center, and is composed of a metal core material 11 that is attached to the upper end of the strut rod 1, and a rubber body 12 that covers this core material 11 with vulcanization adhesive. ing. The core material 11 is formed of a sheet metal material, and has a first sheet portion 13 protrudingly formed in an annular shape on the upper surface, and a second sheet portion 1 on the outer periphery.
4 is formed by bending. On the other hand, the rubber body 12 is
It integrally has annular upper and lower lip portions 15 and 16 that come into elastic contact with the upper and lower corner portions C and C of the box portion 6, respectively, and undergo shear deformation in response to loads in the axial and horizontal directions, and the first seat portion outside of 13,
A first stopper portion 17 that compressively deforms in response to an axial load is formed, and a second stopper portion 17 that compressively deforms in response to a horizontal load is formed on the outside of the second seat portion 14, that is, between the upper and lower lip portions 15 and 16. A stopper portion 18 is formed. Therefore, the upper and lower lip portions 1 can withstand high frequency vibrations in the axial and horizontal directions.
5 and 16 respectively perform shear deformation and absorb the vibration, a vibration-proofing effect is obtained, and the upper and lower lip portions 15 and 16 absorb the vibrations by shearing. 16 is sheared, the first stopper part 17 or the second stopper part 18
is in pressure contact with the vehicle body side and is compressed and deformed to obtain a sufficient vibration damping effect (for example, Japanese Patent Application Laid-Open No.
(See Publication No. 182503).

Problems to be Solved by the Invention However, in the above-mentioned conventional strut mount oscillator, the upper and lower lip portions 15, 16
As described above, sufficient vibration isolation and damping effects can be obtained by performing shear deformation in response to vibrations of the vehicle body, but at the same time, during the shear deformation, the lower surface 15a of the upper lip portion 15 and the upper surface of the lower lip portion 16 16a is the second
Direct and strong surface contact with the upper and lower surfaces 18a and 18b of the stopper portion 18, that is, severe interference, generates a loud hitting sound, resulting in a problem in which the noise of a running vehicle increases.

In addition, Utility Model Application Publication No. 61-6409 and Japanese Patent Application Publication No. 58-
Although the strut mount insulator described in Publication No. 77945 has been provided, these technologies not only do not provide a sufficient vibration damping effect especially when bouncing, but also have problems with each stopper part and lip part. It is difficult to prevent the occurrence of hitting sounds due to severe interference between the two.

Means for Solving the Problems The present invention has been devised in view of the above-mentioned problems of the conventional art. A body part that houses a fixed metal core material and a rubber body covering the core material, and the rubber body is in constant contact with the upper and lower surfaces of the box part and compressively deforms in response to loads in the axial direction. , annular upper and lower lip portions that come into elastic contact with the upper and lower corners of the box portion and undergo shear deformation in response to axial loads, and annular upper and lower lip portions that are formed between the upper and lower lip portions and that compressively deform in response to horizontal loads. A stopper part,
provided on at least one of the opposing surfaces of the upper and lower lip portions or the upper and lower surfaces of the stopper portion,
It is characterized by comprising an elongated protrusion that comes into contact with one of the opposing surfaces via a horizontal slit when an axial load of a predetermined value or more is applied.

Effects According to the present invention, when a large axial load is applied to the rubber body, the body is compressively deformed, and the resilient properties of the rubber provide a sufficient vibration damping effect when bouncing. In addition, when the upper and lower lip portions are sheared in the vertical direction in response to vibrations of the vehicle body, for example, the upper and lower surfaces of the upper and lower lip portions facing the respective projections may be aligned horizontally with the protrusions formed on the upper and lower surfaces of the stopper portion. Line contact is made through the slit, and then partial surface contact is made in stages with the upper and lower surfaces of the stopper portion. That is, since direct surface contact is avoided by the slits and protrusions, hitting noise due to interference is sufficiently reduced.

Embodiments Hereinafter, embodiments of the present invention will be described in detail based on the drawings. It should be noted that the same reference numerals are given to the same components as those of the above-mentioned conventional art, and redundant explanation will be omitted.

1 and 2 are strut rods and coil springs that make up the strut suspension, and 6 is a box portion formed at the strut attachment portion of the vehicle body panel 5, the upper opening of which is closed by a bowl-shaped cap 6a. At the same time, a through hole 7 for the strut rod 1 is formed on the lower surface. Reference numeral 21 denotes a strut mount insulator housed in the box portion 6, and the strut mount insulator 21 is fixed with a nut 9 to the upper end of the strut rod 1 inserted through the central mounting hole 22a. disc-shaped metal core material 2
2 and a rubber body 23 covering this core material 22. The core material 22 has a sheet portion 24 formed on its outer periphery. On the other hand, the rubber body 23 is
A cylindrical body part 25 that comes into contact with the upper and lower surfaces inside the box part 6 and compressively deforms in response to an axial load; Annular upper and lower lip portions 26 and 27 are integrally formed in elastic contact with each other and undergo shearing deformation in response to an axial load. Further, the outer side of the seat portion 24, that is, the upper and lower lip portions 26,
Between 27 and 27, an annular stopper part 28, which is set at approximately the same height as these protruding heights and compressively deforms in response to a horizontal load, is formed through slits 31 and 32 provided vertically along the horizontal direction. has been done.

As shown in FIGS. 2 and 3, the stopper portion 28 is integrally formed with elongated protrusions 29 having a substantially semicircular cross section on the upper and lower surfaces 28a and 28b. Three protrusions 29 are arranged in parallel in the diametrical direction of one of the stopper parts 28, and one protrusion is arranged in a direction orthogonal thereto.

Therefore, this embodiment provides sufficient vibration isolation and protection against high-frequency vibrations in the axial and horizontal directions, as well as large loads in the axial direction and large loads in the horizontal direction during bouncing.
Not only can a vibration damping effect be obtained, but also the body part 25 is in constant contact with the upper and lower surfaces inside the box part 6,
Since the rubber is compressively deformed in response to an axial load, the elasticity of the rubber provides a good vibration absorption effect when bouncing, resulting in a large vibration damping effect.

Moreover, when the upper and lower lip portions 26 and 27 are sheared in the vertical direction, the opposing lower surfaces 26a and 27a of the upper and lower lip portions 26 and 27 are cut into the slits 31 and 3.
2 to each protrusion 29 of the stopper part 28, and then the upper and lower surfaces 28a, 2 of the stopper part 28
It makes partial surface contact with 8b. That is, since the upper and lower lip portions 26, 27 come into contact with the stopper portion 28 in stages through the slits 31, 32 and the respective protrusions 29, there is no sudden and direct strong contact between the upper and lower lip portions 26, 27, 28. Surface contact is avoided. As a result,
The occurrence of hitting sounds due to interference is reduced.

In addition, since the protrusion 29 is elongated and has a substantially semicircular cross section, it makes line contact with the upper and lower surfaces 26a and 27a rather than point contact, so that surface pressure is dispersed and the protrusion 29 is easily moved. Moreover, excessive compressive deformation is prevented, and a sudden rise in spring characteristics can be suppressed.

FIG. 4 shows a second embodiment of the present invention, in which the upper and lower surfaces 26 of the upper and lower lip portions 26, 27 are
A and 27a are formed with protrusions 30 that are opposite to the middle one of the three protrusions 29. Therefore, the protrusion 29 and the protrusion 30 come into contact with each other at this location, and partial surface contact in this vicinity is also prevented, so that the hitting sound is further reduced.

Effects of the Invention As is clear from the above explanation, according to the strut mount insulator according to the present invention, when a large load in the axial direction is applied to the rubber body, the body is compressively deformed and vibrations occur when bouncing. can be absorbed effectively.

In addition, the projections and slits cause the upper and lower lip portions and the stopper portion to come into line contact and partial surface contact in stages, thereby avoiding sudden and direct surface contact, thereby preventing the occurrence of tapping noise due to interference. sufficiently reduced. As a result, it is possible to reduce vehicle noise while driving.

Furthermore, since the protrusion is in line contact with the opposing surface, surface pressure is dispersed, and a sudden rise in spring characteristics due to easy and excessive compressive deformation is suppressed.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing the installed state of the first embodiment of the present invention, FIG. 2 is a front view of the first embodiment, and FIG.
The drawings are a sectional view taken along the line -- in FIG. 2, FIG. 4 is a front view showing a second embodiment of the present invention, and FIG. 5 is a sectional view showing a conventional insulator installed. 1... strut rod, 5... body panel, 6...
Box portion, 21...Strut mount insulator, 22...Metal core material, 23...Rubber body, 25...
Body part, 26...Upper lip part, 26a...Lower surface (opposing surface), 27...Lower lip part, 27a...Upper surface (opposing surface), 28...Stopper part, 28a, 28b...Upper and lower surface, 29...Protrusion part, 31, 32...Slit.

Claims (1)

[Claims] 1. A metal core fixed to the upper end of the strut rod and a rubber body covering the core are housed in a box provided at the upper end of the strut rod on the vehicle body side of the strut suspension,
The rubber body is in constant contact with the upper and lower surfaces of the box part and compressively deforms in response to an axial load;
annular upper and lower lip portions that come into elastic contact with the upper and lower corners of the box portion and undergo shear deformation in response to loads in the axial direction;
An annular stopper portion formed between the upper and lower lip portions and compressively deformed in response to a horizontal load, and an annular stopper portion provided on at least one of the opposing surface of the upper and lower lip portions or the upper and lower surfaces of the stopper portion, and a A strut mount insulator comprising: a long and narrow protrusion that comes into contact with one of the opposing surfaces via a horizontal slit when an axial load is applied to the strut mount insulator.