JP2960313B2 - Air spring device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of an air spring device used for an air suspension or the like of a truck cab.

[0002]

2. Description of the Related Art In order to improve the riding comfort of trucks,
Some cabs are supported on a body frame via an air suspension. FIG. 4 shows an example of the structure, in which an air spring device 4 is interposed between a front end of a frame 1 and a suspension link 3 which is supported by a bracket 2 slightly behind the front end. Is equipped. A cab frame 6 is rotatably supported above the swinging end of the suspension link 3 via a pin 5.
A cab (not shown) is fixed on the cab frame 6. The rotation mechanism using the pin 5 is provided to flip up the cab (tilt up) for maintenance of an engine and accessories to be located below the cab.

FIG . 5 shows details of the air spring device.
Therefore, the air supply passages 16a to 16b are formed so as to penetrate through the lower piston 10 and the center of the bound stopper rubber 14, and have predetermined air spring characteristics according to the supply air pressure through the air supply passages 16a to 16b. Is obtained. (Refer to, for example, Japanese Patent Application Laid- Open No. 2-197470 for a known document of the air suspension device.)

[0004]

According to the air suspension device using such an air spring device 4, the upper piston 11 is pressed downward by the load of the cab acting on the frame 1 at the time of assembling the same. Piston 1
Since the air supply passage 16b opened at the upper end of the bound stopper rubber 14 is in close contact with the upper end surface of the bound stopper rubber 14 on the upper side, the predetermined pressurized air cannot be supplied to the air chamber 15 during assembly. Occurs.

Therefore, as a countermeasure, a troublesome operation of supplying the initial air pressure to the air chamber 15 in a state where the cab is tilted up by a hydraulic cylinder or the like and the load is released is required.

An object of the present invention is to provide means for effectively solving such a problem.

[0007]

According to the present invention, relative to each other,
An air chamber is defined between the movable upper and lower pistons.
One piston has a bounding stock that buffers the collision with the other.
A parabar is provided and the piston and the
An air spring device having an air supply passage formed through the parabar
The bound stopper rubber through the air supply
As well as being formed in a cylindrical shape through which the passage penetrates, as a passage portion,
The upper and lower end faces are formed at multiple locations in the radial direction.
1 passage portion and the first passage portions on the upper and lower end surfaces are mutually connected.
A second passage portion formed in the outer peripheral surface in the axial direction so as to be connected;
Is provided .

[0008]

According to the present invention, based on the above structure, the piston
And the bound stopper rubber opposed to it came into close contact
Sometimes, due to the passage formed in the bound stopper rubber
The air supply passage is communicated with the air chamber. Aisle bounce
Formed at multiple locations on the upper and lower end surfaces of the stopper rubber
The first passage portion and the upper and lower first passage portions are mutually connected.
Second passage portion formed in the outer peripheral surface in the axial direction so as to be connected to the second passage portion
These passages define the air supply passage and the air chamber.
Between the upper and lower
A strong load acts between the stons and the bound stopper rubber
Pressurized air into the air chamber even if the
Can be reliably supplied .

[0009]

Embodiments of the present invention will be described below with reference to the drawings. Parts corresponding to those in the conventional example will be described with the same reference numerals.

In FIG. 1, 4 is an air spring device, 10 is a lower piston, 11 is an upper piston, 12 is a belt,
Reference numeral 3 denotes a bellows, 14 denotes a bound stopper rubber, 15 denotes an air chamber, 16a and 16b denote air supply passages, and their configurations are basically the same as those shown in FIG.

However, above the bound stopper rubber 14
Large in that a groove-shaped passage is formed on the lower end face and the inner and outer circumferences
Very different. That is, in this air spring device 4, FIG.
Alternatively , as shown in FIG.
On the upper and lower end surfaces of the first and second end portions, groove-shaped first passage portions 18a and 18b are formed in two radial directions around the air supply passage 16b, and inner and outer peripheral portions are connected to the first passage portion 18a. The second passage portions 18c, 18 also have a groove shape on the surface.
d is formed in the axial direction.

Based on such a configuration, the upper piston 11
The first passage portion 18a on the upper surface communicates the air supply passage 16b with the outer air chamber 15 in a state where the piston is in close contact with the bound stopper rubber 14, so that air can be reliably supplied in the most compressed state of the piston.

Particularly , passage portions 18b to 18d are formed on the lower surface and the side surface of the bound stopper rubber 14, respectively, so that a plurality of passage portions communicating the air supply passages 16a to 16b and the air chamber 15 are secured. Therefore, even if the passage portion is partially crushed and blocked due to a large load or load deviation, air can be supplied through another passage portion, and thus the air can be supplied. The reliability of supply can be further improved.

[0014]

As described above, according to the present invention, when the piston comes in close contact with the bound stopper rubber, the communicating portion between the air supply passage and the air chamber is ensured by the passage formed in the bound stopper rubber. Especially the first passages at the upper and lower end surfaces of the bound stopper rubber.
Section of a plurality of paths continuous with the section and the second path section on the side surface
To partially block passages, etc.
Regardless, air can be reliably supplied to the air chamber.
The effect that can be obtained is obtained.

Therefore, when the air spring device according to the present invention is applied to, for example, an air suspension device for a truck cab, it is not necessary to tilt up the cab when assembling the same, and the load of the cab is applied to the air spring device. Pressurized air can be supplied to the air chamber as it is, whereby the assembling work can be performed efficiently.

[Brief description of the drawings]

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

FIG. 2 is a longitudinal sectional view of the bound stopper rubber of the embodiment.

FIG. 3 is a bottom view of the same bound stopper rubber.

FIG. 4 is a side view of a main part of the air suspension.

FIG. 5 is a longitudinal sectional view of a conventional air spring device.

[Explanation of symbols]

 Reference Signs List 4 air spring device 10 lower piston 11 upper piston 13 bellows 14 bound stopper rubber 15 air chamber 16a air supply passage 16b air supply passage 18a, 18b first passage portion 18c, 18d second passage portion

Claims (1)

(57) [Claims] An air chamber is defined between upper and lower pistons which are relatively movable with each other, and one of the pistons is provided with a bound stopper rubber for buffering a collision with the other piston, and penetrates the piston and the bound stopper rubber. In an air spring device having an air supply passage, the air supply passage penetrates the bound stopper rubber.
It is formed in a cylindrical shape and as a passage
First passage portions each formed at a plurality of locations in the radial direction,
The first passage portions on the upper and lower end surfaces are connected to each other.
And a second passage portion formed in an outer peripheral surface in an axial direction .