JP2006144874A - Air spring - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air spring not only preventing internal interference from occurring but also enabling an increase in the durability of a diaphragm. <P>SOLUTION: The outer tube 26 of a bush 22 is connected to the lower end face 12B of a piston 12. A chamber 14 formed to have a diameter larger than that of the piston 12 is disposed at a position just above the piston 12, and the outer tube 26 of a bush 24 is connected to the upper end face 14B of the chamber 14. The bush 22 and the bush 24 are alternately disposed in a direction orthogonal to each other so that twist in a direction different from a direction in which twist can be absorbed by the bush 22 can be absorbed. A diaphragm 16 cylindrically formed of a rubber material is disposed between the chamber 14 and the piston 12, and the diaphragm 16 is elastically deformed according to the relative displacement of the chamber 14 to the piston 12. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an air spring that does not cause internal interference and can improve the durability of a diaphragm. For example, in suspensions for vehicles such as trucks and buses, automobiles, vibration-proof support devices for industrial machines, cylinder devices, It is suitable for an air spring that does not have a rod inside as used.

  Conventionally, as a kind of air spring, a diaphragm formed in a cylindrical shape with rubber or the like is disposed on an upper portion of a piston, and a chamber is mounted thereon, and any of these pistons and chambers is attached to a vibration generating portion or a vibration receiving portion. There is known an air spring having a structure in which the two are connected to each other. And in such an air spring, the relative displacement along an axial direction arises between a piston and a chamber by the input of a vibration.

  For example, as an example of this type of air spring, one shown in FIG. 6 is known, and the prior art will be described based on this drawing. That is, as shown in this figure, the air spring 110 is connected to a piston 112 and a chamber 114 by a diaphragm 116 formed of a rubber material or the like, and an outer cylinder 118 attached to the chamber 114 is connected to a diaphragm. In addition to a structure that covers the outer periphery of 116, a bush 122 containing a rubber material is attached to the lower end of the piston 112.

  The chamber 114 is connected to a tire support member (not shown), and a bush 122 disposed at the lower end of the air spring 110 is connected to the vehicle body center C via a link 132 as shown in FIG.

That is, when the lower end of the air spring 110 is directly connected to the link 132, there is a possibility that the piston 112 is moved to one side due to the movement of the link 132 due to the knee action, and internal interference may occur. It has been considered that a bush 122 is attached to the lower end of the air spring 110 and the torsion or swing generated by the movement of the link 132 is absorbed by the bush 122.
JP-T-2002-531784 Japanese Patent No. 2650681 Japanese Patent Laid-Open No. 2004-278583

However, depending on the mounting position of the air spring 110 and the movement of the link 132, twisting and swinging in two directions may occur in the air spring 110. For this reason, even with the air spring 110 shown in FIG. 6, with only one bush 122, the piston 112 approaches one side and internal interference (part A in FIG. 8) occurs, or the piston 112 and the outer cylinder 118 occur. As a result, the durability of the diaphragm 116 is lowered.
An object of the present invention is to provide an air spring that does not cause internal interference and can improve the durability of the diaphragm in consideration of the above facts.

The air spring according to claim 1 is connected to one of the vibration generating portion and the vibration receiving portion, and is capable of absorbing torsion in one direction,
A piston to which the first bush is mounted;
A second bush connected to the other of the vibration generator and the vibration receiver and capable of absorbing torsion in one direction;
A chamber in which the second bush is mounted in a direction in which torsion in a direction different from a direction in which torsion can be absorbed by the first bush;
A cylindrical diaphragm disposed between the piston and the chamber and elastically deforming in accordance with the relative displacement of these members;
It is characterized by having.

The operation of the air spring according to claim 1 will be described below.
A first bush connected to one of the vibration generating portion and the vibration receiving portion is attached to the piston, and a second bush connected to the other of the vibration generating portion and the vibration receiving portion is attached to the chamber. Further, both ends of a cylindrical diaphragm are caulked and fastened to the piston and the chamber, respectively, between the piston and the chamber. That is, the diaphragm is elastically deformed with the relative displacement of these members.

  Therefore, when the vibration generating unit generates vibration, the vibration is transmitted to the diaphragm via either the first bush and the piston or the second bush and the chamber. The vibration is absorbed by the deformation of the diaphragm due to the relative movement between the piston and the chamber, and the vibration is transmitted to the vibration receiving portion connected to the other of the piston or the chamber via any bush. It becomes difficult.

  Furthermore, in this claim, not only the first bush and the second bush that can absorb torsion in one direction, respectively, but also the direction in which the first bush can absorb torsion is different. A second bushing is mounted on the chamber in a direction that can absorb directional torsion.

  As described above, according to the present invention, the first bush and the second bush are arranged in different directions in which torsion can be absorbed, so that even if multi-directional torsion or swing is applied to the air spring. No internal interference occurs and no change in clearance occurs between members. As a result, as the air spring can be stably operated, internal interference is eliminated and the durability of the diaphragm is improved.

The operation of the air spring according to claim 2 will be described below.
The present invention has the same configuration as that of the first embodiment and operates in the same manner, but further has a configuration in which an outer cylinder covering the outer peripheral side of the diaphragm is attached to the chamber. Therefore, in this claim, the outer cylinder is provided, so that the problem of the change in the clearance with the piston is more likely to occur. Even in this case, the durability of the diaphragm is improved by the action of claim 1. It becomes possible to improve.

The operation of the air spring according to claim 3 will be described below.
The present invention has the same configuration as that of the first embodiment and operates in the same manner, but further has a configuration in which each of the first bush and the second bush has a rubber elastic body. Therefore, in the present claims, since these two types of bushes each have a rubber elastic body, the deformation of these elastic bodies enables the bush to more reliably absorb torsion.

The operation of the air spring according to claim 4 will be described below.
This claim has the same configuration as that of claim 1 and operates in the same manner, but further has a configuration in which the first bush and the second bush are each formed in a cylindrical shape. Therefore, in this claim, since these two types of bushes are formed in a cylindrical shape, each bush can absorb the torsion almost evenly even if the torsion is applied from any direction. .

The operation of the air spring according to claim 5 will be described below.
This claim has the same configuration as that of claim 1 and operates in the same manner, but further has a configuration in which the first bush and the second bush are arranged in directions orthogonal to each other. Therefore, in the present claim, these two types of bushes are arranged at different angles at an angle of 90 ° perpendicular to each other, so that internal interference occurs even when multi-directional torsion or swinging is applied. Or a change in the clearance between the piston and the outer cylinder does not occur, and the air spring can be operated more stably.

The operation of the air spring according to claim 6 will be described below.
This claim has the same configuration as that of claim 1 and operates in the same manner, but further has a configuration in which two second bushes are provided with a chamber interposed therebetween. Therefore, in this claim, since there are two second bushes across the chamber, the second bushing is reliably connected by the other of the vibration generating part and the vibration receiving part, and the air spring is more stable. Operation becomes possible.

  As described above, according to the above-described configuration of the present invention, there is an excellent effect that it is possible to provide an air spring that does not cause internal interference and can improve the durability of the diaphragm. The air spring which does not have a rod inside such as used in suspensions for automobiles, anti-vibration support devices for industrial machines, cylinder devices, and the like exhibits a particularly excellent effect.

An air spring according to the best mode of the present invention will be described with reference to the drawings. First, FIG. 1 to FIG. 3 show a first embodiment of an air spring according to the best mode of the present invention, and this embodiment will be described based on these drawings.
As shown in FIG. 1 to FIG. 3, the lower portion of the air spring 10 according to the present embodiment is configured by a piston 12 formed of a metal in a cylindrical shape. As shown in FIGS. 1 to 3, the piston 12 has not only the outer peripheral surface 12A but also a lower end surface 12B which is a lower end surface, and is an outer cylinder serving as an outer peripheral portion of a bush 22 which is a first bush. The bush 22 is attached to the piston 12 by connecting the lower end surface 12B to the piston 12 by welding or the like.

  On the other hand, a chamber 14 made of metal in a cylindrical shape having a larger diameter than the piston 12 is disposed at a position immediately above the piston 12. As shown in FIGS. 1 to 3, the chamber 14 has not only the outer peripheral surface 14 </ b> A but also an upper end surface 14 </ b> B that is an upper end surface, and an outer cylinder 26 that serves as an outer peripheral portion of a bush 24 that is a second bush. The bush 24 is attached to the chamber 14 by being connected to the upper end surface 14B by welding or the like.

  The bush 22 and the bush 24 are each formed in a cylindrical shape configured to connect the outer cylinder 26 and the inner cylinder 28 with a rubber elastic body 30, and are unidirectional (in FIGS. 2 and 3). The torsion in the directions of arrows R1 and R2) can be absorbed by the elastic body 30.

  However, as shown in FIG. 2, the bush 22 has a structure connected to the distal end side of a link 32 whose proximal end side is connected to a vehicle body center C of a vehicle or the like via its inner cylinder 28, and the bush 24 Is connected to a tire support member (not shown) that supports a wheel of a vehicle or the like via the inner cylinder 28. 2 and 3, the bush 22 and the bush 24 are orthogonal to each other so that the bush 24 can absorb the twist in the direction of the arrow R2 different from the direction of the arrow R1 in which the bush 22 can absorb the twist. It is arranged in the direction to be.

  Further, a diaphragm 16 which is an elastic film formed of a rubber material in a cylindrical shape is disposed between the chamber 14 and the piston 12. Fastening bands 16A and 16B, which are reinforcing members formed in a ring shape from steel bands, are respectively attached to both ends of the diaphragm 16, and the diaphragm 16 having the inner fastening band 16A therein is attached. The end portion is caulked and fastened to the upper portion of the piston 12, and one end side of the diaphragm 16 is sealed.

  Further, the end portion of the diaphragm 16 having the outer fastening band 16 </ b> B is caulked and fastened to the outer peripheral surface 14 </ b> A of the chamber 14. The outer cylinder 18 is attached to the chamber 14 by fitting the inner peripheral surface of the outer cylinder 18 formed of metal in a cylindrical shape with the outer circumferential surface 14A of the chamber 14. Accordingly, the other end side of the diaphragm 16 is sandwiched between the outer peripheral surface 14A of the chamber 14 and the outer cylinder 18 covering the outer peripheral side of the diaphragm 16, and the other end side of the diaphragm 16 is sealed.

  As a result, the space S in the diaphragm 16 is sealed by the piston 12 and the chamber 14, and the diaphragm 16 is elastically deformed as the chamber 14 and the piston 12 are relatively displaced. Become.

  As described above, the chamber 14 of the air spring 10 according to the present embodiment is connected to the tire support member, which is a vibration generating portion, via the bush 24, and is connected to the vehicle body. The piston 12 is connected to the link 32 via the bush 22.

  Specifically, as shown in FIG. 2 showing a plane along the Y direction (vehicle left-right direction) and the Z direction (vertical direction), as the link 32 turns around the center C of the vehicle body, The center BC of the bush 22 moves along the track line K. At this time, the elastic body 30 of the bush 22 is twisted as indicated by an arrow R1.

  Further, as shown in FIG. 3 showing a plane along the X direction (vehicle longitudinal direction) and the Z direction orthogonal to the plane of FIG. 2, as the link 32 turns around the vehicle body center C, this Even in the plane, the center BC of the bush 22 similarly moves along the arcuate track line K. At this time, the elastic body 30 of the bush 24 is twisted as indicated by the arrow R2.

Next, the operation of the air spring 10 according to the present embodiment will be described.
Between the piston 12 to which the bush 22 connected to the link 32 is mounted and the chamber 14 to which the bush 24 connected to the tire support member is mounted, both ends of the cylindrical diaphragm 16 are respectively connected to the piston 12. In addition, it is caulked and fastened to the chamber 14. That is, the diaphragm 16 is elastically deformed with the relative displacement of these members. An outer cylinder 18 formed to cover the outer peripheral side of the diaphragm 16 is attached to the chamber 14.

  Accordingly, when the tire support member generates vibration, the vibration is transmitted to the diaphragm 16 via the bush 24 and the chamber 14. The vibration is absorbed by the deformation of the diaphragm 16 accompanying the relative movement between the chamber 14 and the piston 12, and the vibration is hardly transmitted to the link 32 connected to the piston 12 via the bush 22. .

  Further, in this embodiment, the bush 22 and the bush 24 each capable of absorbing torsion in one direction are not only provided as described above, but also the arrow R2 different from the arrow R1 direction in which the bush 22 can absorb torsion. A bushing 24 is mounted on the chamber 14 in a direction that can absorb the twist of the direction. That is, as shown in FIGS. 1 to 3, the bush 22 and the bush 24 are arranged in directions orthogonal to each other.

  As described above, in this embodiment, the bushing 22 and the bushing 24 are arranged in different directions in which torsion can be absorbed, so that even if the air spring 10 is subjected to multi-directional twisting or swinging, FIG. As shown in FIG. 2, the piston 12 and the chamber 14 are merely inclined relatively, and the piston 12 is not shifted to one side, so that no internal interference occurs in the air spring 10.

  In accordance with this, there is no change in the clearance between the piston 12 and the outer cylinder 18. As a result, as the air spring 10 can be stably operated, the internal interference is eliminated and the durability of the diaphragm 16 is improved.

  Furthermore, according to the present embodiment, since the bush 22 and the bush 24 are arranged in directions different from each other at an angle of 90 ° perpendicularly to each other, when multi-directional torsion or swing is applied. In the above, the above-described effects are enhanced, and the air spring 10 can be operated more stably.

  On the other hand, in this embodiment, the bush 22 and the bush 24 each have a rubber elastic body 30 and are formed in a cylindrical shape. Therefore, according to the present embodiment, these two types of bushes 22 and 24 each have the elastic body 30 made of rubber, so that the bushes 22 and 24 are more reliably twisted by the deformation of the elastic body 30. In addition to absorption, these two types of bushes 22 and 24 are each formed into a cylindrical shape, so that the bushes 22 and 24 are substantially even when twisting is applied to the air spring 10 from any direction. Can absorb torsion.

  Further, in this embodiment, the outer cylinder 18 for covering the outer peripheral side of the diaphragm 16 is attached to the chamber 14, so that the problem of a change in clearance with the piston 12 is more likely to occur. Even in this case, the durability of the diaphragm 16 can be improved by the above action.

Next, an air spring according to a second embodiment of the present invention is shown in FIG. 4, and this embodiment will be described based on this drawing. In addition, the same code | symbol is attached | subjected to the member same as the member demonstrated in 1st Example, and the duplicate description is abbreviate | omitted.
As shown in FIG. 4, this embodiment also has a structure substantially similar to that of the first embodiment. However, in the first embodiment, the bush 24 is mounted on the upper end surface 14B of the chamber 14, whereas the bush 24 of the air spring 10 according to this embodiment sandwiches the chamber 14 as shown in FIG. It is said that there are two existing structures.

  That is, the outer cylinder 26 of the bush 24 is connected to the outer peripheral surface 14A and the outer cylinder 18 of the outer peripheral surface 14A facing each other by welding or the like, so that the two bushes 24 are connected to the chamber 14 respectively. It is installed. Therefore, in addition to acting in the same manner as in the first embodiment, the presence of the two bushes 24 with the chamber 14 interposed therebetween allows the bush 24 to be more securely connected to the tire support member in the present embodiment. A more stable operation of the spring 10 is possible.

Next, an air spring according to a third embodiment of the present invention is shown in FIG. 5, and this embodiment will be described based on this drawing. In addition, the same code | symbol is attached | subjected to the member same as the member demonstrated in 1st Example and 2nd Example, and the duplicate description is abbreviate | omitted.
This embodiment shown in FIG. 5 has a structure in which the outer cylinder 26 of the bush 24 is connected to the outer peripheral surface 14 </ b> A of the chamber 14 and the bush 24 is attached to the chamber 14 in the same manner as the second embodiment. However, in this embodiment, only one bush 24 is mounted.

  Accordingly, in this embodiment, the bush 24 is mounted on the outer peripheral surface 14A of the chamber 14, but this embodiment also has the effect of improving the durability of the diaphragm 16 as in the first embodiment. .

  The air spring 10 according to the above embodiment has one bush 22 as the first bush, but may have a plurality of bushes, and one or two bushes 24 as the second bush. However, it may be a structure having three or more.

It is sectional drawing which shows the air spring of 1st Example which concerns on this invention. It is sectional drawing which shows the air spring of 1st Example which concerns on this invention, Comprising: It is a figure which shows the state connected with the front end side of the link. FIG. 3 is a cross-sectional view taken along arrow 3-3 in FIG. 2. It is sectional drawing which shows the air spring of 2nd Example which concerns on this invention. It is sectional drawing which shows the air spring of 3rd Example which concerns on this invention. It is sectional drawing which shows the air spring of a prior art example. It is sectional drawing which shows the air spring of a prior art example, Comprising: It is a figure which shows the state connected with the front end side of the link. FIG. 8 is a cross-sectional view taken along line 8-8 in FIG. 7.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Air spring 12 Piston 14 Chamber 16 Diaphragm 18 Outer cylinder 22 Bush (1st bush)
24 Bush (second bush)

Claims (6)

A first bush connected to one of the vibration generator and the vibration receiver and capable of absorbing torsion in one direction;
A piston to which the first bush is mounted;
A second bush connected to the other of the vibration generator and the vibration receiver and capable of absorbing torsion in one direction;
A chamber in which the second bush is mounted in a direction in which torsion in a direction different from a direction in which torsion can be absorbed by the first bush;
A cylindrical diaphragm disposed between the piston and the chamber and elastically deforming in accordance with the relative displacement of these members;
An air spring characterized by comprising:   The air spring according to claim 1, wherein an outer cylinder covering an outer peripheral side of the diaphragm is attached to the chamber.   The air spring according to claim 1, wherein each of the first bush and the second bush has a rubber elastic body.   The air spring according to claim 1, wherein the first bush and the second bush are each formed in a cylindrical shape.   The air spring according to claim 1, wherein the first bush and the second bush are arranged in directions orthogonal to each other. 2. The air spring according to claim 1, wherein the second bush has two chambers across the chamber.

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