KR101131044B1 - Air suspension apparatus - Google Patents

Abstract

The present invention relates to an air suspension provided with an air spring having a canister and an upper mount on an upper portion of a piston rod of a shock absorber. The mounting bracket is fixed to a vehicle body while forming part of the upper mount, and the canister and And a mount rubber interposed between the mount brackets, and a rigid reinforcement body installed at the canister to be spaced apart from the mount brackets and reinforcing the rigidity of the mount rubbers in a predetermined section.

Canister, Air Spring, Rigid Reinforcement, Shock Absorber, Upper Mount, Mount Rubber, Mount Bracket

Description

Air suspension device {AIR SUSPENSION APPARATUS}

1 is a partial cross-sectional view showing an air suspension device according to an embodiment of the present invention.

Figure 2 is an enlarged cross-sectional view showing the main part of the air suspension according to an embodiment of the present invention.

Figure 3 is a view for explaining the action of the mounting rubber and the rigid reinforcement according to an embodiment of the present invention.

<Code Description of Main Parts of Drawing>

2: shock absorber 3: air spring

4: upper mount 22: piston rod

30: Canister 41: Mount Bracket

42: mount rubber 45: mount holder

50: rigid reinforcement body 61, 62: sealing bush

63: road holder 64: sealing

The present invention relates to an air suspension having a mount rubber that is compressed and restored between a mount bracket of an upper mount and a canister of an air spring, and more particularly, to reinforce the rigidity of the mount rubber only in a part of the compression section of the mount rubber. It relates to an air suspension having a means for doing so.

In general, the air suspension device is provided between the vehicle body side and the wheel side, and has a structure in which an air spring is installed on the piston rod of the shock absorber. As the air suspension, an air suspension including a canister, an air piston, and an air spring composed of a rubber tube is known. In such an air spring, the canister and the air piston are hermetically connected by a rubber tube, whereby an air chamber is formed around the shock absorber. The piston rod of the shock absorber extends upward through the canister, and the upper portion of the piston rod is provided with an upper mount for connecting the shock absorber and the air spring to the vehicle body.

In the conventional air suspension system, a mount bracket which is a part of the upper mount is fixed to the vehicle body, while a damping function is applied to the shock and vibration input through the shock absorber, in particular, the vertical high frequency vibration and torsional moment between the mount bracket and the canister. Mount rubbers that perform this are integrally interposed.

However, in the conventional air suspension system, when the vehicle weight is increased by more than CVW (Curb Vehicle Weight), and moreover, by GVW (Gross Vehicle Weight) state by passenger or cargo loading, the mount rubber is excessively compressed and the garage is increased. It causes a phenomenon of lowering and a decrease of high frequency attenuation force. This is due to design limitations that the mount rubber must be designed with small stiffness for damping or damping of vibrations.

In addition, in the conventional air suspension device, the piston rod is inserted through the canister, and the inserted piston rod is respectively provided with a set of upper and lower sets of o-rings, and a set of sealing plates is provided on the opposite side of each of the O-rings. It is fitted in, by the nut, the piston rod and the upper mount is made of a direct connection structure. However, the conventional structure as described above, there is a big problem that there is a possibility that gaps that damage the airtightness between the sealing plate and the piston rod, and between the O-rings and the sealing plate or piston rod.

One technical problem of the present invention includes a rigid reinforcing body which reinforces the mount rubber only in a part of the compression section of the mount rubber, and uses a small rigidity as it is in the small compression section of the mount rubber, and in the large compression section of the mount rubber. It is to provide an air suspension device to reinforce the rigidity of the mount rubber.

Another technical problem of the present invention is to provide an air suspension device in which a piston rod is directly fixed to a canister, and a seal between the canister and the piston rod is more reliably and reliably sealed at the directly fixed portion thereof, thereby greatly improving airtightness and durability. It is.

According to an aspect of the present invention, there is provided an air suspension having an air spring and an upper mount having a canister on the piston rod of the shock absorber. The air suspension device includes: a mount bracket fixed to a vehicle body while forming part of the upper mount, and a mount rubber interposed between the canister and the mount bracket; It is installed on the canister spaced apart from the mount bracket, and includes a rigid reinforcing body to reinforce the rigidity of the mount rubber in a certain section.

Preferably, the rigid reinforcement body is an annular elastic rubber that is installed on the upper portion of the canister, avoiding the mount rubber, and in this case, an annular groove in which the annular elastic rubber is fitted is fixed to the upper portion of the canister.

Preferably, the air suspension further includes rod fixing means for sealing and fixing the piston rod passing through the canister to the canister, wherein the rod fixing means includes a rod hole of the canister through which the piston rod is penetrated. A central groove formed in the canister so as to communicate with the rod hole in a wider size, an annular rod holder positioned in the central groove fixed to the outer circumferential surface of the piston rod, and fitted in a lower portion of the central groove; Pressing the first and second sealing bush facing the top and bottom of the rod holder, the mount holder fitted to the upper side of the center groove to press the first and second sealing bush, and the first and second sealing bush It consists of a holder fixing portion for fixing the mount holder of the central groove.

Preferably, the holder fixing part includes a holder fixing ring fitted to the annular seat surface on the upper side of the mount holder, and a holder fixing groove formed in an annular shape on the inner circumferential surface of the central groove and fitted with the holder fixing ring. In addition, a seal ring may be provided between the outer circumferential surface of the mount holder and the inner circumferential surface of the central groove.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

Example

1 is a partial cross-sectional view showing an air suspension device according to an embodiment of the present invention, Figure 2 is an enlarged cross-sectional view showing the main part of the air suspension device according to an embodiment of the present invention, Figure 3 is 2 is a view for explaining the action of the mount rubber and the rigid reinforcement according to the embodiment.

As shown in FIG. 1, the air suspension device 1 includes a shock absorber 2, an air spring 3 installed above the shock absorber 2, the shock absorber 2, and an air spring. And an upper mount 4 or the like for connecting 3 to the vehicle body (not shown).

The shock absorber 2 includes an oil-filled cylinder 21 and a piston rod 22 which is slidably accommodated in the cylinder 21. The piston rod 22 is connected to a piston valve (not shown) in the cylinder 21, the piston valve, along with the piston rod 22, the cylinder along the relative movement between the vehicle body and the axle It reciprocates within 21 to generate a predetermined damping force.

The air spring 3 includes a canister 30 provided on an upper side of the piston rod 22 and an air piston 32 provided on an outer circumferential portion of the cylinder 21. The canister 30 and the air The piston 32 is hermetically connected by a rubber tube 31 to form one air chamber 33. An air supply / exhaust means (not shown) may be connected to the air spring 3 to supply compressed air to the air chamber 33 and to exhaust the compressed air from the air chamber 33.

The upper mount 4 is installed above the canister 30 of the air spring 3 and connects the air spring 3 and the shock absorber 2 to the vehicle body, and includes a mount bracket 41 and a mount. Rubber 42, mount cup 43, buffer rubber 44, and the like. The mount bracket 41 is a part directly fixed to the vehicle body by, for example, a bolt, and the mount rubber 42 is joined to the bottom thereof. The mount rubber 42 is interposed between the mount bracket 41 and the canister 30 so that the mount rubber 42 is always in contact with the upper surface of the canister 30. In addition, a buffer rubber 44 is interposed between the mount bracket 41 and the mount cup 43.

In addition, the upper mount 4 further includes a mount holder 45 fixed directly to the canister 30. An upper portion of the mount holder 45 is provided with a threaded portion 451 integrally provided through the mount cup 43 and positioned above the mount cup 43, and a nut 431 is provided on the mount cup 43. By being fastened to the threaded portion 451, the components constituting the upper mount 4 are connected to the canister 30. In addition, the air suspension device 1 of the present embodiment has an annular rigid reinforcement body 50 which reinforces the rigidity of the mount rubber 42 that absorbs vibration and shock between the mount bracket 41 and the canister 30 at a predetermined interval. More). The rigid reinforcement body 50 will be described in more detail with reference to FIGS. 2 and 3 below.

As best shown in FIG. 2, the mount rubber 42 is interposed between the mount bracket 41 and the canister 30 in a substantially annular shape. The rigid reinforcement body 50 is made of an annular elastic rubber and fitted into an annular groove 302 formed on the upper portion of the canister 30 to be fixed. At this time, the annular groove 302 and the rigid reinforcement body 50 fixed thereto are positioned to avoid the mount rubber 42. In this embodiment, the rigid reinforcement body 50 is concentric with the mount rubber 42, but has a smaller diameter than the mount rubber 42.

Unlike the mount rubber 42 is always kept in contact with the mount bracket 41 and the canister 30, the rigid reinforcement body 50, in the state that the mount rubber 42 is not compressed, The mount bracket 41 is spaced apart from the predetermined distance. Accordingly, in the section in which the mount rubber 42 is compressed, there is a section in which the rigid reinforcement 50 is compressed together with the mount rubber 42.

In the section where the rigid reinforcement body 50 is compressed, the rigidity of the mount rubber 42 is reinforced. As the rigid reinforcement 50 reinforces the rigidity of the mount rubber 42, the excessive compression of the mount rubber 42 due to the heavy vehicle weight and the phenomenon of excessively lowering the garage by the excessive compression are suppressed. . In addition, by using the rigid reinforcement body 50, the phenomenon of lowering the high frequency attenuation ability due to overcompression of the mount rubber 42 can be suppressed.

3 (a) shows the initial compressed state of the mount rubber 42. In this state, the mount rubber 42 acts to attenuate high frequency vibration or torsional moment in the vertical direction with only its small rigidity. If the mount rubber 42 is further compressed from the state of FIG. 3A, as shown in FIG. 3B, the rigid reinforcement body 50 comes into contact with the mount bracket 41, and from the contact point of time. In addition, the rigid reinforcement 50 serves to reinforce the rigidity of the mount rubber 42.

The rigid reinforcement body 50 is formed of an annular elastic rubber, and functions to absorb shock and vibration while being compressed together with the mount rubber 42. At this time, the material, the outer diameter, the thickness of the rigid reinforcement 50, and the separation distance between the rigid reinforcement 50 and the mounting bracket 41 is a tuning parameter of the rigidity reinforced by the rigid reinforcement (50). .

The air suspension device according to the present embodiment includes a configuration for fixing the piston rod 22 and the canister 30 in a sealed state. Hereinafter, the piston rod 22 and the canister 30 are sealed. The fixing structure will be described in more detail.

As shown in FIG. 2, a central groove 304 is formed at an upper center of the canister 30 to communicate with a hole (hereinafter, referred to as a 'rod hole') through which the piston rod 22 passes. The center groove 304 surrounds the periphery of the piston rod 22 while being formed to be wider than the rod hole. On the other hand, the annular rod holder 63 is located in the central groove 304 while being fixed by a nut on the upper outer peripheral surface of the piston rod 22. In addition, the first and second sealing bushes 61 and 62 fit snugly under the central groove 304.

The first sealing bush 61 is seated on the bottom of the central groove 304, the inner part of the upper surface is opposed to the bottom surface of the rod holder 63. Further, the second seal sheath 62 is pressed by a mount holder 45 located above it, and a portion of the lower surface inner side abuts the upper surface of the rod holder 63. The mount holder 45 is fitted above the central groove 304 to press the first and second sealing bushes 61 and 62. The first and second sealing bushes 61 and 62 are pressed against the piston rod 22 and the canister 30 by pressing the rod holder 63 while being pressed by the mount holder 45. The secondary seal is made.

The mount holder 45 is fixed directly in the center groove 304 by a holder fixing portion described below. In this case, the mount holder 45 may be fixed in the state in which the first and second sealing bushes 61 and 62 are pressed in the center groove 304. In particular, the first and second sealing bushes 61 and 62 may be made of, for example, an elastic material such as rubber. In this case, the first sealing bush 61 and the second sealing bush 62 may be formed. The outer side of the rod holder 63 may be deformed to be opposed to each other. In addition, when the first and second sealing bushes 61 and 62 are made of a material having a relatively small elasticity, a part of the first and second sealing bushes 61 and 62 facing the rod holder 63 may be removed. It may also be considered to form stepped to facilitate the butt between the two sealing bushes 61, 62.

According to an exemplary embodiment of the present invention, the holder fixing part may include a holder fixing ring 66 fitted to an annular seat surface above the mount holder 45 and an annular shape formed on an inner circumferential surface of the central groove 304. And a holder fixing groove 306 into which the fixing ring 66 is fitted. At this time, the holder fixing ring 66 is preferably a C-shaped metal ring that is fitted to the holder fixing groove 306 in an elastically deformed state.

As described above, the mount holder 45, the center groove 304 of the canister 30 while pressing the first and second sealing bushes 61 and 62 located above and below the rod holder 63. Since it is fixed in the), it can be tightly sealed fixed between the piston rod 22 and the canister 30 together with the rod holder (63). In addition, a sealing 64 is installed on the outer circumferential surface of the mount holder 45 to be in contact with the inner circumferential surface of the central groove 304. The sealing 64 allows the inside of the canister 30 to be more reliably sealed. Can be.

As mentioned above, the mount holder 45 is integrally provided with a threaded portion 451 penetrating the mount cup 43 and positioned above the mount cup 43, and a nut 431 is mounted on the mount cup. (43) By being fastened to the threaded portion 451 at the top, each component constituting the upper mount 4 can be integrally connected to the canister (30).

 While the present invention has been particularly shown and described with reference to specific embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the present invention as defined by the appended claims. And should not be construed as limiting the scope of the present invention, but rather should be construed as exemplifying the invention.

According to one embodiment of the present invention, the small stiffness of the mount rubber can be used as it is, and the stiffness of the mount rubber can be reinforced in the large compression section of the mount rubber, thereby over-compressing the mount rubber. Therefore, excessively low phenomenon of garage height and high frequency attenuation ability can be suppressed. In addition, according to another embodiment of the present invention, the piston rod is to be directly fixed to the canister, and the air suspension with improved airtightness and durability significantly by sealing more reliably and reliably between the canister and the piston rod in the directly fixed portion The device can be implemented.

Claims (6)

In the air suspension having the canister and an air spring on the piston rod of the shock absorber, A mount bracket fixed to the vehicle body while forming part of the upper mount; A mount rubber interposed between the canister and the mount bracket; And The air suspension device is installed on the canister spaced apart from the mount bracket, the rigid reinforcement body for reinforcing the rigidity of the mount rubber in a certain section. The air suspension apparatus according to claim 1, wherein the rigid reinforcement body is an annular elastic rubber installed above the canister to avoid the mount rubber. The air suspension apparatus according to claim 2, wherein an annular groove is formed on an upper portion of the canister, in which the annular elastic rubber is fitted. The method of claim 1, further comprising a rod fixing means for sealing and fixing the piston rod penetrating the canister to the canister, the rod fixing means, the rod rod is of a size larger than the rod hole of the canister through which the piston rod A center groove formed in the canister so as to communicate with the rod hole, an annular rod holder positioned in the center groove fixed to an outer circumferential surface of the piston rod, and a top and bottom of the rod holder being fitted into a lower side of the center groove; First and second sealing bushes facing each other, a mount holder fitted to an upper side of the central groove to press the first and second sealing bushes, and the mount holder in a state of pressing the first and second sealing bushes. Air suspension device characterized in that consisting of a holder fixing portion for fixing to the central groove. The holder holder of claim 4, wherein the holder fixing part comprises a holder fixing ring fitted to the annular seat surface above the mount holder, and a holder fixing groove formed in an annular shape on an inner circumferential surface of the central groove and fitted with the holder fixing ring. Air suspension characterized in that. The air suspension apparatus according to claim 4, wherein a sealing is provided between an outer circumferential surface of the mount holder and an inner circumferential surface of the central groove.

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