JPS6129523Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to an air suspension, and more specifically, an air chamber is formed by surrounding the upper part of a shock absorber, which generates damping force on the extension side and the compression side, with an outer cylinder and a rolling diaphragm. Regarding air suspension.

Since the rolling diaphragm provided in the air suspension forms a high-pressure air chamber together with the outer cylinder, it is required to have sufficient strength to prevent air leakage. At the same time, the rolling diaphragm is also required to have the flexibility to roll following the expansion and contraction of the shock absorber. Therefore, at present, the material must be limited to rubber.

However, it is difficult to say that existing rubber materials have sufficient heat resistance when other required performances such as ozone resistance and adhesive strength between the rubber and the cord are considered. Therefore, when the surface temperature of the shock absorber exceeds 130 degrees, such as when continuously driving on a highly uneven road surface, there is a risk that the rolling diaphragm will deteriorate.

An object of the present invention is to provide an air suspension that can reduce the surface temperature of a shock absorber.

The air suspension according to the present invention includes a cylinder and a heat dissipation fin that is provided on the cylinder surrounding the outer peripheral surface of the lower end of the cylinder and whose outer diameter becomes smaller toward the upper side. an absorber, an outer cylinder surrounding the upper part of the shock absorber, a rolling diaphragm extending from the outer cylinder to the cylinder, and a dust cover fixed to the outer cylinder and surrounding the rolling diaphragm, the dust cover being for air venting. It has pores.

Embodiments of the present invention will be described below with reference to the drawings.

Air suspension uses shock absorber 1
0, and a rolling diaphragm 16 disposed between the cylinder of the shock absorber and the outer cylinder, and the outer cylinder 12 and the rolling diaphragm 16 constitute an air chamber 18 with a variable volume. Ru.

The shock absorber 10 includes a cylinder 14, a piston 20 sliding inside the cylinder 14, a rod guide 22 connected to the piston 20 at its tip and disposed at the opening of the cylinder 14, and a seal member 2.
4 and a piston rod 26 projecting to the outside through the piston rod 4. The cylinder 14 is connected to a suspension arm of an automobile, and the piston rod 26 is connected to a vehicle body for use.

A foot valve mechanism 28 is provided at the bottom of the cylinder 14, which mainly controls damping on the compression side.
On the other hand, the piston 20 is provided with a valve mechanism 30 that mainly controls damping on the extension side. Said configuration is known per se. The cylinder 14 contains oil for operation.

The outer cylinder 12 is attached to a cap 32 fixed to the piston rod 26 and extends downwardly, so that the lower end of the outer cylinder and the upper end of the cylinder 14 are connected to each other.
The rolling diaphragm 16 is fixed by clamps 34, respectively, and the shock absorber 10
An air chamber 18 is formed in the upper part of. Outer cylinder 12
A dust cover 40 is attached to protect the rolling diaphragm 16 from dust.

An air passage 36 is formed in the piston rod 26, through which the air chamber 18 is communicated with an external switching valve mechanism and an air source. By increasing or decreasing the volume of the air chamber 18, the height of the vehicle body connected to the piston rod 26 can be adjusted.

At the lower end of the cylinder 14, the foot valve mechanism 2
A heat radiation fin 38 is fixed to the outer peripheral surface of the cylinder 14 corresponding to the cylinder 8 . The fins 38 are arranged to surround the outer periphery of the cylinder 14. As mentioned above, the foot valve mechanism 2 is installed at the bottom of the cylinder 14.
8, the foot valve mechanism 28
The surface temperature of the shock absorber 10 becomes particularly high in the vicinity of . In the present invention, heat is radiated by the fins 38 to lower the surface temperature of the shock absorber 10, which in turn lowers the temperature of the oil contained in the shock absorber.

The range of the fins 38 in the axial direction of the cylinder is when the vehicle height is at its lowest, that is, the range of the air chamber 18
It is preferable that the upper end of the fin 38 be as large as possible without coming into contact with the rolling diaphragm 16 when the volume of the fin 38 is minimized. The largest outer diameter d of the fins is selected to be smaller than the inner diameter D of the dust cover 40 attached to the outer cylinder 12. This allows the fins 38 to be attached to the dust cover 4 during use.
There is no interference with 0.

The fins 38 are formed of a material with good thermal conductivity, such as an aluminum alloy, to increase the heat transfer area. The fins 38 are formed so that the outer diameter becomes smaller toward the upper side. With this shape, during use, the wind that hits the shock absorber 10 at a substantially right angle can be guided between the cylinder 14 and the dust cover 40 as shown by the arrow, and the rolling diaphragm 16 can be air-cooled by the wind. In this case, a large number of air vent holes 42 are provided in the dust cover 40 to prevent the flow of air from becoming stagnant.

Note that the present invention can also be implemented in air suspension systems that do not have a vehicle height adjustment function.

According to the present invention, since the cylinder of the shock absorber is provided with fins, even if the temperature of the oil inside the cylinder increases and this is transmitted to the cylinder of the shock absorber, the increase in the surface temperature of the cylinder can be suppressed. Can be done. As a result, even when the vehicle continuously travels on a highly uneven road surface, the amount of heat transferred to the rolling diaphragm in contact with the cylinder of the shock absorber can be maintained at a low level, and the rolling diaphragm can be prevented from deteriorating due to temperature. .

In addition, the outer diameter of the fins decreases toward the top, and air vent holes are provided in the dust cover surrounding the rolling diaphragm, so the fins can easily guide air into the dust cover. Since the rolling diaphragm is air-cooled by the guided air, the influence of heat on the rolling diaphragm can also be suppressed from this point of view.

[Brief explanation of the drawing]

The figure is a sectional view of the air suspension according to the present invention. 10...Shock absorber, 12...Outer cylinder,
14...Cylinder, 16...Rolling diaphragm, 18...Air chamber, 38...Fin.

Claims (1)

[Scope of utility model registration request] A shock absorber having a cylinder and a heat dissipating fin that is provided on the cylinder to surround the outer peripheral surface of the lower end of the cylinder and whose outer diameter becomes smaller toward the upper side; a surrounding outer cylinder; a rolling diaphragm extending from the outer cylinder to the cylinder;
The air suspension includes a dust cover fixed to the outer cylinder and surrounding the rolling diaphragm, the dust cover having an air vent hole.