KR102129805B1 - Bellows typed air spring - Google Patents

Abstract

The present invention relates to a bellows type air spring and, more specifically, to a bellows type air spring comprising: an upper end cap and a lower end cap coupled to both ends of a bellows configured to be contracted and expanded; an upper body tube arranged within the bellows and having the upper end cap coupled thereto; and a lower body tube arranged within the bellows to have the lower end cap coupled thereto, and coupled to the upper body tube. A first air hole with a rectangular shape formed in the circumferential direction of the upper body tube and a second air hole with a rectangular shape formed in the circumferential direction of the lower body tube and corresponding to the first air hole are provided wherein an opening and closing means for regularly maintaining an opening area of each air hole when the upper body tube is lifted and lowered is provided at the upper body tube and the lower body tube. The bellows type air spring regularly maintains the opening area of the air hole to prevent air flow from being blocked at a specific region by allowing a door to gradually open and close the first air hole with a rectangular shape so that the second air hole with the rectangular shape of the lower body tube is always opened by the opening and closing means when the upper body tube is lifted and lowered, thereby improving air flow performance to enhance responsiveness and also making air pressure control easy to enhance performance of a shock absorber.

Description

Bellows typed air spring

The present invention maintains the opening area of the air hole uniformly by opening and closing the upper and lower cylinders and opening and closing the rectangular first air hole so that the rectangular second air hole of the lower tube is always opened. By doing so, the air flow is prevented from being clogged in a specific area, and through this, the air flow property is improved to improve responsiveness, and also relates to a bellows-type air spring that can facilitate pneumatic control.

In general, a suspension device of a vehicle is equipped with a chassis spring together with a shock absorber to improve riding comfort by absorbing various vibrations or shocks transmitted from the road surface while driving.

The chassis spring may be classified into a plate spring, a coil spring, an air spring, etc., and the dual air spring has an advantage of maintaining a constant vehicle height, but a device for adjusting air pressure according to a load and for air compression. It requires equipment and is mainly used for large vehicles such as buses.

The air spring has a bellows type in which the volume and pressure of the inside are changed by expansion and contraction according to the operating method, a diaphram type in which a rubber lock is reversed according to expansion and contraction, and a combination thereof.

Such an air spring is a chassis spring that supports a vehicle using a bellows or diaphragm described above instead of a general coil spring, and is configured to change air pressure through a separately provided compressor.

Conventional bellows-type air springs are composed of a hollow bellows that can be contracted and expanded (restored) and an upper cap and a lower cap fixedly coupled to both ends of the bellows, and the upper cap is an air inlet through which external air is injected. Is equipped.

The conventional bellows-type air spring as described above absorbs vibration or shock of the vehicle as the bellows compresses and expands in the axial direction at the same time as the operation of the built-in compressor. At this time, the bellows behaves asymmetrically even slightly out of the axial direction. If there is, there is a problem that cracks are generated in the bellows.

In other words, in the conventional bellows-type air spring, when the compressed bellows behaves asymmetrically even slightly out of the axial direction, out of axial behavior and torsion of the bellows occur, and such out of axial There is a problem that cracks are generated in the bellows due to the behavior and torsional behavior, and eventually the spring function is lost.

In order to solve this problem, the Republic of Korea Patent Registration No. 10-1315710 (2013.10.01. registration) "bellows type air spring" is a hollow bellows contractible and expandable and an upper cap and a lower cap fixedly coupled to both ends of the bellows Including, the inside of the bellows is configured to be fixedly mounted to the top cap and the bottom cap, respectively, and the upper and lower barrels are slidably coupled to each other. As the bellows move, the bellows are stretched only in the axial direction, and the upper barrel is formed with a sliding slit protruding long in the axial direction on the surface, and the sliding slit slides in the upper barrel while being inserted into the slit hole of the lower barrel. By guiding the movement, the rotational behavior of the upper and lower barrels is prevented to suppress the torsional behavior of the bellows, and the upper and lower barrels are formed with a plurality of pressure regulating holes penetrating the outer circumferential surface, and the pressure regulating hole The open area of the hole is changed according to the vertical movement of the upper barrel that enters and exits the inside of the lower barrel, so that the speed of increase and decrease of the pressure in the air spring can be changed.

This prevents the bellows from behaving abnormally, thereby preventing the bellows from cracking and improving durability.

In the case of the prior art, a plurality of circular pressure regulating holes are arranged up and down on the upper and lower barrels to vary the opening area of the holes according to the vertical movement of the upper barrel, thereby changing the speed of pressure increase and decrease in the spring.

However, in the case of the prior art, when the upper and lower cylinders move up and down, a moment in which the pressure adjusting hole is closed may occur, and in this case, a section in which the flow of air is blocked occurs. This phenomenon may not only reduce the responsiveness by lowering the flowability of the air, thereby causing a problem of temporarily decreasing the shock absorber function.

Republic of Korea Registered Patent No. 10-1315710 (2013.10.01. registered)

The present invention has been made to solve the problems as described above,

When the opening/closing means elevates and descends the upper cylinder, the door gradually closes and opens the rectangular first air hole, so that the rectangular second air hole of the lower cylinder is always opened, thereby keeping the open area of the air hole uniform, thereby allowing air flow. It is an object of the present invention to provide a bellows type air spring that can prevent clogging in this specific area, improve airflow through this, improve responsiveness, and facilitate pneumatic control.

The bellows type air spring according to the present invention includes an upper cap and a lower cap coupled to both ends of the bellows configured to be able to contract and expand; An upper barrel disposed inside the bellows and coupled to the upper cap; And a lower first cylinder which is disposed inside the bellows and the lower cap is coupled and is coupled to the upper cylinder; and a rectangular first air hole formed in the circumferential direction of the upper cylinder and the lower cylinder. It is formed along the circumferential direction and is provided with a rectangular second air hole corresponding to the first air hole,

It characterized in that the upper and lower barrels are provided with opening and closing means for uniformly maintaining the open area of each air hole when the upper and lower cylinders are moved up and down.

The opening and closing means according to the present invention is a door for opening and closing the first air hole of the upper barrel, a protrusion formed at the bottom of the door, and formed in the lower barrel, and disposed above the second air hole It is characterized in that the projection is made to include an insertion portion is fitted.

It characterized in that the guide portion for guiding the door of the opening and closing means is further provided on both sides of the first air hole of the upper barrel according to the present invention.

It characterized in that the upper and lower barrels according to the present invention is further provided with a guide means for guiding the lifting operation.

The guiding means according to the present invention includes a plurality of male or female guides formed in the vertical direction on the outer circumferential surface of the upper barrel, and an arm or male guide part formed on the lower barrel and each guide portion of the upper barrel is slide-coupled. Characterized in that it comprises.

In the bellows type air spring according to the present invention, when the opening/closing means elevate or descend the upper cylinder, the door gradually closes and opens the rectangular first air hole, so that the rectangular second air hole of the lower cylinder is always opened. By keeping the open area uniform, air flow can be prevented from clogging in certain areas.

In addition, the present invention can not only increase the responsiveness by improving the air flow, but also can facilitate pneumatic control, thereby improving the performance of the shock absorber.

1 is a perspective view showing an air spring for a bellows according to the present invention,
Figure 2 is an exploded perspective view showing the air spring for the bellows according to the present invention,
Figure 3 is a partial perspective view and an enlarged view showing the opening and closing means of the air spring for the bellows according to the present invention,
Figure 4 is an operating state showing that each air hole opening area is maintained uniformly by the operation of the opening and closing means according to the invention,
Figure 5 is a cross-sectional view showing a guide portion for guiding the lifting operation of the opening and closing means according to the invention,
6 is a partially enlarged perspective view showing another embodiment of the opening and closing means according to the present invention.

Hereinafter, exemplary embodiments of the present invention will be exemplified and described with reference to the present invention, the operational advantages of the present invention, and the objectives achieved by the practice of the present invention.

First, the terms used in the present application are only used to describe specific embodiments, and are not intended to limit the present invention, and singular expressions may include plural expressions unless the context clearly indicates otherwise. Also, in this application, the terms “include” or “have” are intended to indicate that a feature, number, step, operation, component, part, or combination thereof described on the specification is present, or one or more other. It should be understood that features or numbers, steps, actions, components, parts or combinations thereof are not excluded in advance.

In describing the present invention, when it is determined that a detailed description of related known configurations or functions may obscure the subject matter of the present invention, the detailed description will be omitted.

1 to 4, the bellows 10 air spring according to the present invention includes an upper cap 11 and a lower cap 13 coupled to both ends of the bellows 10, and an upper barrel 20. , It includes a lower barrel 30, and comprises a rectangular first air hole 21 and a second air hole 31 formed to correspond to each other in the upper tube 20 and the lower tube 30.

In addition, the upper and lower cylinders 20 and 30 are provided with opening and closing means 40 for uniformly maintaining the opening area of each air hole when the upper and lower cylinders 20 are moved up and down.

1 and 2, the upper cap 11 and the lower cap 13 according to the present invention are coupled and fixed to the upper and lower ends of the hollow bellows 10, which can be contracted and expanded (restored), respectively.

In this case, the upper end of the upper tube 11 is mounted on the bottom of the upper tube 20, and the lower end of the lower tube 13 of the lower cap 13 is mounted on the upper surface. In addition, the upper cap 11 has an air inlet 15 for injecting external air, and a compressor (not shown) for changing and adjusting the air pressure in the bellows 10 is built in.

1, 2 and 4, the upper tube 20 and the lower tube 30 according to the present invention, the upper tube 20 is inserted into the lower tube 30, the upper tube 20 slides It is configured to move up and down through the operation.

This causes the upper barrel 20 to slide up and down or in the axial direction with respect to the lower barrel 30 according to the load fluctuation acting on the upper cap 11, and the bellows 10 is axial in the vertical direction by the slide movement in the vertical direction. Will only be built into.

To this end, the upper tube 20 is inserted into the lower tube 30 to move the slide in the vertical direction, and this slide movement is implemented by the guide means 50.

Prior to this, the assembly of the upper tube 20 and the lower tube 30 is made in the form of inserting the upper tube 20 in the upper direction from the bottom of the lower tube 30. In this case, when the upper tube 20 is completely inserted and fully lifted, the first flange portion 25 protruding outward is provided at the bottom of the upper tube 20 to prevent the upper tube 20 and the lower tube 30 from being separated. ) Is formed, and a second flange portion 33 protruding inward is formed at an upper portion of the lower barrel 30. Therefore, when the upper barrel 20 is fully elevated, the first flange portion 25 and the second flange portion 33 abut and act as a stopper, so that the upper and lower cylinders 20 and 30 are separated. Can be prevented. That is, it sets the expansion limit of the upper and lower cylinders 20 and 30, thereby performing the function of determining the expansion limit of the bellows 10.

The guide means 50 as described above is arranged in the vertical direction on the outer circumferential surface of the upper tube 20, a plurality of male or female guides formed along the circumferential direction is formed. In addition, in response to this, an arm or a male guide portion is formed in the estuary barrel so that each guide portion of the upper barrel 20 slides. In this case, the guide portion of the lower barrel 30 may be formed on the second flange portion 33 formed on the upper end.

More specifically, the guide portion of the upper barrel 20 is provided with a male guide portion 51 in the form of a projection, and the guide portion of the lower barrel 30 is a groove guide arm 53 in the second flange portion 33. It is composed. Therefore, since the male guide portion 51 is inserted into the female guide portion 53, when the slide is moved, the upper barrel 20 and the lower barrel 30 behave in directions other than the axial direction, i.e., rotational movement or twisting. Behavior and the like can be prevented.

In this case, in the attached FIG. 2, the upper guide tube 20 is provided with a male guide part 51 of the guide means, and the lower guide tube 30 is shown with a guide arm 53 of the guide means. On the contrary, it is also possible that a male guide is formed in the upper barrel and a male guide is formed in the lower barrel.

2 to 4, the first and second air holes 31 of the rectangle are formed along the circumferential direction so as to correspond to the upper and lower cylinders 20 and 30, respectively, according to the present invention. When the means 40 is introduced to move the upper and lower cylinders 20 up and down, it is configured to maintain the open area of the air hole uniformly.

This is the case where a plurality of circular air holes are formed in the upper and lower cylinders in the vertical direction as in the prior art, when the upper and lower cylinders move up and down, the moment when the air holes are closed may occur. In this case, the air flow is blocked. Will occur. This phenomenon may not only reduce the responsiveness by lowering the flowability of the air, thereby causing a problem of temporarily decreasing the shock absorber function.

Therefore, in the present invention, the opening/closing means 40 is introduced in order to prevent such a decrease in air flow and increase the responsiveness to maintain the function of the shock absorber.

Opening means for this is a door 41 for opening and closing the first air hole 21 of the upper tube 20, a protrusion 43 formed at the bottom of the door 41, and a lower tube 30 It is formed on the second air hole (31) is disposed on the upper portion is made to include an insertion portion 45 is fitted with a projection (43).

That is, the door 41 of the opening/closing means 40 is configured to be slidable in the vertical direction to the first air hole 21. To this end, both sides of the first air hole 21 of the upper tube 20 are shown in FIG. As shown in the figure, a'U' shaped guide portion 23 is formed to guide slide movement of the door 41. In this case, although not shown in the accompanying drawings, it is also possible to prevent the door from completely exiting from the bottom of the first air hole by forming a stopper function protrusion at the bottom of the guide portion.

In addition, the protruding portion 43 of the opening and closing means 40 is formed at the bottom of the door 41 and protrudes outward.

In addition, the insertion portion 45 of the opening/closing means 40 is formed inside the upper portion of the second air hole 31, that is, the lower barrel 30, and is formed as an insertion groove between protrusions spaced up and down.

Therefore, the protrusion 43 is configured to be inserted into the insertion portion 45, and when the upper and lower cylinders 20 are raised and lowered, the door 41 is lowered and raised relative to the upper cylinder.

In this case, when assembling the upper barrel 20 and the lower barrel 30 as described above, the protrusion 43 is fitted into the insertion portion 45, so as to facilitate coupling between the protrusions, as shown in FIG. It is also possible to form an inclined first entry guide portion 43a in the upper surface portion of the 43), and to form an inclined second entry guide portion 45a in the lower protrusion of the insertion portion 45.

Therefore, when assembling the upper barrel 20 by inserting it from the bottom into the lower barrel 30, the first entry guide portion 43a of the protrusion 43 and the second entry guide portion 45a of the insertion portion 45 incline each other. It can be combined by riding to facilitate the mutual coupling.

As shown in FIG. 4, when the upper and lower cylinders 20 are moved up and down by the opening/closing means 40 configured as described above, the air hole opening area is uniformly maintained.

That is, the illustration of Fig. 4 (a) is the case where the upper tube 20 is located at the expansion limit that is fully elevated, and in this case, the door 41 of the opening/closing means 40 is the first air hole of the upper tube 20 ( 21) will be completely closed. In this state, the second air hole 31 of the lower barrel 30 is completely opened.

4(b) shows that the upper tube 20 is lowered by a predetermined distance, in this case, the door 41 of the opening/closing means 40 is the upper tube 20 by the distance the upper tube 20 is lowered. ). In this state, the second air hole 31 of the lower barrel 30 is maintained in a completely open state as shown in Fig. 4 (a).

4(c) shows that the upper tube 20 is completely lowered, and in this case, the door 41 of the opening/closing means 40 also maintains a relatively elevated state with respect to the upper tube 20. . In this state, the second air hole 31 of the lower barrel 30 is maintained in a completely open state as shown in FIGS. 4A and 4B.

Conversely, as shown in Figure 4 (c), when the upper tube 20 is moved up and down in a completely lowered state, the door 41 of the opening/closing means 40 has the upper tube 20 as much as the distance the upper tube 20 lifted ( 20), so the second air hole 31 of the lower tube 30 is always kept open.

That is, the opening/closing means 40 according to the present invention, when the upper tube 20 is lowered, the door 41 moves up and down relative to the upper tube 20 while opening the first air hole 21 of the upper tube 20. Opening by the descending distance of the upper tube 20, the part where the second air hole 31 is blocked at the portion where the first air hole 21 and the second air hole 31 overlap can be completely opened.

In addition, the opening and closing means 40 when the upper tube 20 is elevated, the door 41 is lowered relative to the upper tube 20 while the first air hole 21 of the upper tube 20 is placed in the upper tube 20 ) By closing the lifting distance of the first air hole 21 and the second air hole 31 overlap the second air hole 31 can be completely opened by removing the clogged portion.

Therefore, in the opening and closing means 40 according to the present invention, when the upper and lower cylinders 20 are elevated and lowered, the door 41 gradually closes and opens the first air hole 21, so that the lower cylinder 30 is always removed. 2 By opening the air hole 31, the open area of the air hole is uniformly maintained.

This can prevent the air flow from being clogged in a specific area by keeping the open area of the air hole uniform, and through this, the air flow can be improved to improve the responsiveness, and pneumatic control can be facilitated. Can improve the performance.

As described above, the present invention has been described with reference to one embodiment shown in the drawings, but this is only an example, and various modifications and equivalent other embodiments are possible from those skilled in the art. Will understand

Therefore, the true technical protection scope of the present invention should be defined by the technical spirit of the appended claims.

10: bellows
11: Top cap 13: Bottom cap
15: air inlet
20: upper tube
21: first air hole 23: guide portion
25: first flange portion
30: lower tube
31: second air hole 33: second flange portion
40: opening and closing means
41: door 43: protrusion
43a: first entry induction section 45: insertion section
45a: second entry induction
50: guide means
51: male guide 53: cancer guide

Claims (5)

A top cap 11 and a bottom cap 13 coupled to both ends of the bellows 10 configured to allow contraction and expansion;
The upper barrel 20 is disposed inside the bellows 10, the upper cap 11 is coupled; And
Is disposed inside the bellows 10, the lower cap 13 is coupled, the upper tube 20 and the lower tube 30 is coupled; is made, including,
A rectangular first air hole 21 formed along the circumferential direction of the upper barrel 20 and a rectangular agent formed in the lower barrel 30 along a circumferential direction and corresponding to the first air hole 21 2 is provided with an air hole (31),
When the upper and lower cylinders 20 are elevated and lowered, the upper and lower cylinders 20 and 30 are provided with opening and closing means 40 for uniformly maintaining an open area by the air holes,
The opening and closing means 40
A door 41 for opening and closing the first air hole 21 of the upper tube 20,
And a projection 43 formed at the bottom of the door 41,
Bellows-type air spring is formed on the lower barrel 30, it is disposed on the second air hole (31), including the insertion portion 45, the projection 43 is fitted.
delete According to claim 1,
Bellows-type air spring, characterized in that further provided with a guide portion 23 for guiding the door 41 of the opening and closing means 40 on both sides of the first air hole 21 of the upper tube 20.
According to claim 1,
A bellows-type air spring, characterized in that the upper tube (20) and the lower tube (30) are further provided with guiding means (50) for guiding the lifting operation.
The method of claim 4, wherein the guide means (50)
A plurality of male or female guides formed in the vertical direction on the outer peripheral surface of the upper tube 20,
Bellows type air spring is formed on the lower barrel 30, characterized in that each guide portion of the upper barrel 20 is made of a slide or a female or male guide portion.

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