JPH08326819A - Air spring - Google Patents

Abstract

PURPOSE: To provide a bellows type air spring in which elasticity can be regulated simply. CONSTITUTION: A circular section bellows base bottom part 16 on whose periphery surface a screw thread 16a is formed is provided at the lower part of a bellows 15, and a socket part 18 to which the bellows base bottom part 16 is screwed is formed at a base part 11. At the center parts of the base part 11 and the bellows base bottom part 16, ventilation holes 17 to connect a space part 15a inside the bellows 15 to outer air are respectively formed in the extension/contraction direction of the bellows 15. On the bottom surface of the socket part 18, a ringlike elastic body 20 that is compressed elastically according to the screwing-in position of the bellows 15 and also is coaxial with the ventilation holes 17 is furnished.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air spring having a bellows attached to a base portion, the base portion being attached to a portion to which a shock is applied so as to exhibit elasticity against a shock applied from above the bellows.

[0002]

2. Description of the Related Art In FIG. 3, reference numeral 8 denotes an air spring of this type, which has a base portion 8a attached to a portion which receives an impact.
And a bellows 8b attached to the base,
A ventilation hole 8c is formed in a to adjust the air resistance when the air in the space of the bellows 8b is exhausted. When the air spring is attached to, for example, the panel 9 around the opening of a luggage door of an automobile, which will be described later, the air hole 8c is provided.
The diameter of is properly set according to the structure of the luggage door, so that the hinge arm has a proper cushioning action when it is opened by the torsion bar.

[0003]

However, when it is desired to change the elasticity depending on the weight of the luggage door or the type of torsion bar, it is necessary to prepare a plurality of types of air springs.

In view of the above points, the present invention has an object to provide a bellows type air spring whose elasticity can be easily adjusted.

[0005]

In order to achieve this object, the present invention comprises a base portion attached to a portion that receives an impact and a bellows attached to the base portion, and against an impact applied from above the bellows. In an elastic air spring, a bellows base having a circular cross section with a thread formed on the peripheral surface is provided under the bellows, and a socket portion into which the bellows base is screwed is formed at the base, and the base and the bellows base are formed. Vents that connect the space inside the bellows to the outside air are formed in the center of the bellows in the direction of expansion and contraction of the bellows. The bottom surface of the socket is elastically compressed according to the screwing position of the bellows and is coaxial with the vents. The ring-shaped elastic body is attached.

[0006]

The thickness of the elastic body changes according to the screwed-in position of the bellows, and the inner diameter of the ring changes, so that the air resistance when exhausting the space of the bellows changes according to the screwed-in position of the bellows. Therefore, when a force is applied from above the bellows, the bellows exhibits elasticity according to the screwed position and the screwed position is also stabilized by the elastic reaction force of the elastic body.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An air spring according to an embodiment of the present invention will be described with reference to FIG. The air spring 10 has a base 11 made of synthetic resin or rubber with a ring-shaped mounting groove 12 formed around the base 11.
And a bellows 15 having a ring-shaped cross section, which is attached to the base and is made of a material exhibiting bending elasticity, for example, synthetic resin or rubber. A bellows base portion 16 having a circular cross section with a thread 16a formed on the peripheral surface is provided integrally with the bellows by integral molding. A socket portion 18 having a thread 18a is formed in the base portion 11 so that the bellows base portion 16 can be screwed.

Vent holes 13 and 17 are formed in the central portions of the base portion 11 and the bellows base portion 16 so that the space portion 15a of the bellows 15 communicates with the outside air in the direction of expansion and contraction of the bellows 15. A ring-shaped elastic body 20 is mounted on the bottom surface 18b of the socket portion 18, and a ring-shaped rigid washer 21 is further mounted on the top surface thereof. Inner peripheral surface 2 of elastic body 20
The inner diameter of 0a is set smaller than the inner diameter of the vent hole 13 in a state where the degree of compression of the thickness is small. The washer 21 may be omitted depending on circumstances.

FIG. 2 shows an air spring 10 constructed as described above.
Here is an example of using. In the figure, a base 4a of a hinge 4 is attached to a panel 2a joined to an inside of a panel 2 of an automobile body around an opening of a luggage door 1 of an automobile, and a hinge arm 4b pivotally attached to the base is attached to a luggage door 4b. 1 is fixed to the panel 1a, and the luggage door 1 is biased in the opening direction by a well-known method by the torsion bar 3. Then, the mounting groove 12 of the base 11 of the air spring 10 is engaged with the mounting hole 2b at the position where the hinge arm 4b rotates when the door is opened in the panel 2a.

The bellows 15 changes the inner diameter of the ring-shaped elastic body 20 in advance depending on the position where the bellows 15 is screwed into the socket portion 18, so that the bellows 15 exhibits a proper cushioning action when the door is opened. It is adjusted according to force. The screwing position is also stabilized by the elastic reaction force of the elastic body 20. When the luggage door 1 locked at the closed position shown by the solid line position is unlocked, the torsion bar 3 opens to the two-dot chain line position. At that time, when the hinge arm 4b collides with the bellows 15, air is exhausted by air resistance according to the opening areas of the vent holes 13 and 17, the elastic body 20 and the washer 21, and the bellows 15 is compressed, so that an appropriate cushioning action is provided. Given. When the weight of the luggage door 1 or the type of the torsion bar 3 changes, the bellows 15 is rotationally adjusted and the thickness of the elastic body 20 is compressed so that the opening area of the elastic body 20 is adjusted to obtain an appropriate cushioning action.

[0011]

The elasticity of the air spring of the present invention can be adjusted simply by changing the screwing amount of the bellows into the socket. Therefore, it is possible to cope with various objects to which a shock is applied without using a plurality of types of air springs.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of an air spring according to an embodiment of the present invention.

FIG. 2 is a sectional view of a luggage room of an automobile using the same air spring.

FIG. 3 is a vertical sectional view of a conventional air spring.

[Explanation of symbols]

 11 Bases 13 and 17 Vents 15 Bellows 16 Bellows Base 18 Sockets 20 Ring-shaped Elastic Body

Claims (1)

[Claims] 1. An air spring having a base portion attached to a portion to be impacted and a bellows attached to the base portion, and having elasticity to a shock applied from above the bellows, wherein a thread is formed on a peripheral surface thereof. A bellows base having a circular cross section is provided under the bellows, and a socket portion into which the bellows base portion is screwed is formed in the base portion, and a space portion inside the bellows is provided at the center of the base portion and the bellows base portion in the outside air. Vents that communicate with each other are formed in the direction of expansion and contraction of the bellows, and a ring-shaped elastic body that is elastically compressed according to the screwed position of the bellows and is coaxial with the vent hole is attached to the bottom surface of the socket portion. An air spring characterized in that.