JPS6332430Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an air suspension device with a shock absorber, which is a spring means for supporting a vehicle body to wheels with a spring.

In this type of air suspension device, one end is fixed to the outer cylinder of the shock absorber, and the other end is inverted and fixed to a protective cylinder that extends upward and is supported on the piston rod of the shock absorber, forming a compressed gas chamber inside. A device having a rolling seal type diaphragm is known, but in this type of air suspension device, the deformation resistance of the inverted portion of the diaphragm is large, so
There was a drawback in that it could not sufficiently absorb small-width vibrations such as joint shocks on the road surface. In an attempt to eliminate such defects, it has been proposed that a synthetic resin layer with a low coefficient of friction is formed on the outer cylinder of the shock absorber in contact with the rolling seal diaphragm (Utility Model Application No. 56-1999).
(See Publication No. 161805). However, with this type of structure, when driving on rough roads, foreign objects such as sand tend to get caught between the synthetic resin layer and the diaphragm, and the synthetic resin layer is damaged by the foreign objects, resulting in peeling. It becomes easier to do. Once peeling begins, the diaphragm adhesive force at that part is large, so the synthetic resin layer turns over due to the adhesive force, and the peeling progresses further, reducing the adhesive force reduction effect and reducing the amount of vibration caused by the air suspension device. There was a problem that the vibration absorption effect was reduced.

In view of the above-mentioned problems, the present invention aims to reduce the deformation resistance at the inverted portion of a rolling seal type diaphragm as much as possible and over a long period of time, and in order to achieve this purpose, The shock absorber is characterized by a configuration in which the surface along the diaphragm, which is formed in the outer cylindrical portion of the shock absorber and on which the rolling seal type diaphragm repeatedly contacts and separates, is made into an uneven surface to reduce the contact area.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An air suspension device with a shock absorber according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

The shock absorber 1 is used with the lower end of the outer cylinder 2 attached to the wheel (not shown) side, and the upper end of the piston rod 3 attached to the vehicle body 4 side.
The mutual sliding movement between the piston rod 3 and the piston rod 3 acts to absorb shocks from the wheels.

At the upper end of the piston rod 3, a protective cylinder 5 in the form of an inverted cylinder with a bottom is supported and fixed.

Between the upper end of the shock absorber outer cylinder 2 and the lower end of the protective cylinder 5, a lower end 6a is fixed to the outer cylinder 2, an upper end 6b is turned outward and extends upward, and is fixed to the protective cylinder 5, and compressed gas is contained inside. A rolling seal diaphragm 6 forming a chamber 7 is interposed.

The diaphragm 6 is composed of an inverted portion 8 that is rolled up as the outer cylinder 2 moves upward, and a cylindrical portion 9 that extends upward from the inverted portion 8.

In the shock absorber outer cylinder 2, the surface along the diaphragm where the rolling seal type diaphragm 6 repeatedly contacts and separates has a spiral concave portion 10a and a convex portion 10, as shown in an enlarged view in FIG.
The surface 10 has an uneven surface 10 consisting of a diaphragm 6, and the contact area with the diaphragm 6 is small. By doing so, it is possible to reduce the adhesion force of the diaphragm 6 to the outer cylinder 2, and the inverted portion 8 of the diaphragm 6 is easily turned over.

Note that as a method for forming the uneven surface 10, it is desirable to employ a roll processing method.

Further, as shown in FIG. 3, a protective layer 11 made of a low-friction material such as Teflon resin may be provided on the uneven surface 10, and the presence of the protective layer 11 further enhances the effect of reducing the diaphragm adhesive force. It will improve.

4 to 6 show various modifications of the uneven surface 10, and the uneven surface 10 in FIG.
Respectively independent circular recesses 10a, 10a...
and convex portions 10b, 10b..., and the uneven surface 10 in FIG.
0b... and groove-shaped recesses 10a around the protrusions 10b, 10b..., and the uneven surface 10 in FIG.
consists of dimple-shaped recesses 10a, 10a, . . . and an unprocessed protrusion 10b.

When the convex portions 10b, 10b, etc. are discontinuous like the uneven surface 10 shown in FIGS. 4 and 5, it is suitable to use a plastic material such as synthetic resin as the low-friction material. . This is because even if the low-friction material of a certain convex portion 10b were to peel off, it would be stopped only by that convex portion 10b, and there is an advantage that the peeling would not progress to the entire surface.

In addition, in the case where the recesses 10a, 10a, etc. are discontinuous like the uneven surface 10 shown in FIGS. 4 and 6, a semi-solid material (lubricating material) such as grease may be used as a low friction material. suitable for use. This is because each recess 10a acts as a lubricant reservoir,
This is because it is possible to prevent the lubricant from flowing down.

FIG. 7 shows another embodiment of the invention. In this case, a cover 12 made of synthetic resin is attached to the upper part of the shock absorber outer cylinder 2, and the lower end 6a of the rolling seal type diaphragm 6 is fixed to the upper end of the cover 12. Therefore, the outer circumferential surface of the cover 12 becomes a surface along the diaphragm and has an uneven surface 10. Reference numeral 13 is a seal rubber.

In addition, in the uneven surface 10 of each of the above examples, the recess 10
A needs to be processed to have a width and depth sufficient to accommodate relatively small foreign matter such as sand.

In the drawings, reference numeral 14 is a bump stopper, 15 is a retainer for the bump stopper, and 16 is a vibration isolating rubber.

The illustrated air suspension device operates as follows.

While driving on a road, vibrations from the wheels are absorbed by air pressure fluctuations caused by changes in the volume of the compressed gas chamber 7 due to the curling or curling of the inverted portion 8 of the diaphragm 6.
The diaphragm 6 can be easily separated from the uneven surface 10 due to the effect of reducing the adhesive force due to the reduction in the contact area with the uneven surface 10 along the diaphragm.
Therefore, even small amplitude vibrations from the wheels can be easily absorbed.

Also, when driving on a rough road, the diaphragm 6 and the uneven surface 1
Even if a foreign object such as sand is caught between the diaphragm 6 and the diaphragm 6, the foreign object can be contained in the recess 10a of the uneven surface 10, so there is no risk of the diaphragm 6 coming into direct contact with the foreign object and damaging the diaphragm 6. It disappears.

Next, the effects of the air suspension device with a shock absorber of the present invention will be described.

According to the present invention, the surface along the diaphragm, which is formed in the outer cylindrical portion of the shock absorber and on which the rolling seal type diaphragm repeatedly contacts and separates, is made into an uneven surface to reduce the contact area between the two. The adhesive force to the cylinder is greatly reduced, the deformation resistance of the diaphragm is reduced, and the dynamic spring constant of the air suspension device during minute vibrations can be reduced. Therefore, there is a practical effect that joint shock etc. can be effectively absorbed and riding comfort is greatly improved.

In addition, since the concave portions of the uneven surface act as a reservoir for foreign matter such as sand, direct contact between foreign matter and the diaphragm is prevented, and the durability of the diaphragm can be improved. When a protective layer is applied, there is an advantage that the protective layer on the convex portion can be prevented from being peeled off by foreign substances such as sand.

[Brief explanation of the drawing]

FIG. 1 is a vertical sectional side view of an air suspension device with a shock absorber according to an embodiment of the present invention, FIG. 2 is an enlarged view of section A in FIG. 1, and FIG.
FIG. 1 is an enlarged view of essential parts of an air suspension device with a shock absorber in which a protective layer is provided on the uneven surface of the outer cylinder; FIGS. 4 to 6 are partially enlarged views showing modifications of the uneven surface; FIG. 7 is an enlarged sectional view of a main part of an air suspension device with a shock absorber according to another embodiment of the present invention. 1...Shock absorber, 2...Outer cylinder, 3...
. . . Piston rod, 5 .

Claims (1)

[Scope of utility model registration request] The lower end is fixed to the outer cylinder of the shock absorber,
An air suspension device having a rolling seal type diaphragm whose upper end is inverted outward and is fixed to a protective cylinder which extends upward and is supported on a piston rod of a shock absorber and forms a compressed gas chamber therein, An air suspension device with a shock absorber, characterized in that the surface along the diaphragm formed in the outer cylinder and on which a rolling seal type diaphragm repeatedly contacts and separates is an uneven surface.